Spring Boot Web应用程序中注册 Servlet 的方法实例-低调大师

Spring Boot Web应用程序中注册 Servlet 的方法实例

2017-12-30 533

Spring Boot Web应用程序中注册 Servlet 的方法实例

本文实例工程源代码：https://github.com/KotlinSpringBoot/demo1_add_servlet

我们对如何创建Controller 来响应JSON 以及如何显示数据到页面中，已经很熟悉了。

Web开发使用 Controller 基本上可以完成大部分需求，但是我们还可能会用到 Servlet、Filter、Listener、Interceptor 等等。

当使用spring-Boot时，嵌入式Servlet容器通过扫描注解的方式注册Servlet、Filter和Servlet规范的所有监听器（如HttpSessionListener监听器）。
Spring boot 的主 Servlet 为 DispatcherServlet，其默认的url-pattern为“/”。也许我们在应用中还需要定义更多的Servlet，该如何使用SpringBoot来完成呢？

在spring boot中添加自己的Servlet有两种方法，代码注册Servlet和注解自动注册（Filter和Listener也是如此）。
一、代码注册通过ServletRegistrationBean、 FilterRegistrationBean 和 ServletListenerRegistrationBean 获得控制。
也可以通过实现 ServletContextInitializer 接口直接注册。

二、在 SpringBootApplication 上使用@ServletComponentScan 注解后，Servlet、Filter、Listener 可以直接通过 @WebServlet、@WebFilter、@WebListener 注解自动注册，无需其他代码。

通过代码注册Servlet示例

image.png

Demo1AddServletApplication.kt

package com.easy.springboot.demo1_add_servlet

import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication

@SpringBootApplication
class Demo1AddServletApplication

fun main(args: Array<String>) {
    runApplication<Demo1AddServletApplication>(*args)
}

build.gradle

buildscript {
    ext {
        kotlinVersion = '1.2.0'
        springBootVersion = '2.0.0.M7'
    }
    repositories {
        mavenCentral()
        maven { url "https://repo.spring.io/snapshot" }
        maven { url "https://repo.spring.io/milestone" }
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
        classpath("org.jetbrains.kotlin:kotlin-allopen:${kotlinVersion}")
    }
}

apply plugin: 'kotlin'
apply plugin: 'kotlin-spring'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'

group = 'com.easy.springboot'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

repositories {
    mavenCentral()
    maven { url "https://repo.spring.io/snapshot" }
    maven { url "https://repo.spring.io/milestone" }
}


dependencies {
    compile('org.springframework.boot:spring-boot-starter-web')
    compile("org.jetbrains.kotlin:kotlin-stdlib-jre8")
    compile("org.jetbrains.kotlin:kotlin-reflect")
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

工程目录

demo1_add_servlet$ tree
.
├── build
│   ├── kotlin
│   │   ├── compileKotlin
│   │   └── compileTestKotlin
│   └── kotlin-build
│       └── version.txt
├── build.gradle
├── demo1_add_servlet.iml
├── demo1_add_servlet.ipr
├── demo1_add_servlet.iws
├── demo1_add_servlet_main.iml
├── demo1_add_servlet_test.iml
├── gradle
│   └── wrapper
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
├── out
│   └── production
│       ├── classes
│       │   ├── META-INF
│       │   │   └── demo1_add_servlet_main.kotlin_module
│       │   └── com
│       │       └── easy
│       │           └── springboot
│       │               └── demo1_add_servlet
│       │                   ├── Demo1AddServletApplication.class
│       │                   └── Demo1AddServletApplicationKt.class
│       └── resources
│           └── application.properties
└── src
    ├── main
    │   ├── java
    │   ├── kotlin
    │   │   └── com
    │   │       └── easy
    │   │           └── springboot
    │   │               └── demo1_add_servlet
    │   │                   └── Demo1AddServletApplication.kt
    │   └── resources
    │       ├── application.properties
    │       ├── static
    │       └── templates
    └── test
        ├── java
        ├── kotlin
        │   └── com
        │       └── easy
        │           └── springboot
        │               └── demo1_add_servlet
        │                   └── Demo1AddServletApplicationTests.kt
        └── resources

35 directories, 18 files

启动应用

/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/bin/java -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=51448 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=127.0.0.1 -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=51449:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath /Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/lib/tools.jar:/Users/jack/KotlinSpringBoot/demo1_add_servlet/out/production/classes:/Users/jack/KotlinSpringBoot/demo1_add_servlet/out/production/resources:/Users/jack/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter-web/2.0.0.M7/eb364c43417c6de883c38ffc9d79b91a63c9c3bd/spring-boot-starter-web-2.0.0.M7.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jre8/1.1.61/7cb0d1b54614623a4b297af1eea7bc3aa0e9e63/kotlin-stdlib-jre8-1.1.61.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-reflect/1.1.61/bb6da1a122c3fba2f7ee5c71946441e4f756fad4/kotlin-reflect-1.1.61.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter-json/2.0.0.M7/7f352d7960cbe1a341e0721625dddb1bca6c5313/spring-boot-starter-json-2.0.0.M7.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter/2.0.0.M7/b9affaea8ab21294386d5c2682b66f143852878d/spring-boot-starter-2.0.0.M7.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter-tomcat/2.0.0.M7/709f5f42c3cfdc6d5a5d6921b7bcb7714f8d638c/spring-boot-starter-tomcat-2.0.0.M7.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.hibernate.validator/hibernate-validator/6.0.5.Final/c0a53a8178a0487c5f2fe84434b9965a3cd44f22/hibernate-validator-6.0.5.Final.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.springframework/spring-webmvc/5.0.2.RELEASE/8dbe4a28cae3ffa222aeff6776a3928a88d66e6f/spring-webmvc-5.0.2.RELEASE.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.springframework/spring-web/5.0.2.RELEASE/eea8edef792fb93c1c55cc61078ce14ffb3542df/spring-web-5.0.2.RELEASE.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jre7/1.1.61/59dfce93b1995717338435dd974884007d8e8474/kotlin-stdlib-jre7-1.1.61.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.1.61/fa7813a26c548c9c412dd2d42fb466cfcd8dcf3c/kotlin-stdlib-1.1.61.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-autoconfigure/2.0.0.M7/db2360882ec36c119c4378d01b0325a833b07271/spring-boot-autoconfigure-2.0.0.M7.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot/2.0.0.M7/b1e1ad98517ae8988dd578b3ae2e2705c8f5634/spring-boot-2.0.0.M7.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-starter-logging/2.0.0.M7/328a8032b5ed852958d410dec02638c0a93b3cb1/spring-boot-starter-logging-2.0.0.M7.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/javax.annotation/javax.annotation-api/1.3.1/20a2c0583598d68b0835474bbe07792d4f3b219f/javax.annotation-api-1.3.1.jar:/Users/jack/.gradle/caches/modules-2/files-2.1/org.springframework/spring-context/5.0.2.RELEASE/743a5f6d94a8af5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com.easy.springboot.demo1_add_servlet.Demo1AddServletApplicationKt
objc[30612]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/bin/java (0x10c75a4c0) and /Library/Java/JavaVirtualMachines/jdk1.8.0_40/Contents/Home/jre/lib/libinstrument.dylib (0x10dfb74e0). One of the two will be used. Which one is undefined.

. ____ _ __ _ _
/\ / ' __ _ () __ __ _ \ \ \
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\/ )| |)| | | | | || (| | ) ) ) )
' |____| .|| ||| |_, | / / / /
=========||==============|/=////
:: Spring Boot :: (v2.0.0.M7)

2017-12-31 13:51:44.939 INFO 30612 --- [ main] c.e.s.d.Demo1AddServletApplicationKt : Starting Demo1AddServletApplicationKt on jacks-MacBook-Air.local with PID 30612 (/Users/jack/KotlinSpringBoot/demo1_add_servlet/out/production/classes started by jack in /Users/jack/KotlinSpringBoot/demo1_add_servlet)
2017-12-31 13:51:44.944 INFO 30612 --- [ main] c.e.s.d.Demo1AddServletApplicationKt : No active profile set, falling back to default profiles: default
2017-12-31 13:51:45.100 INFO 30612 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@63355449: startup date [Sun Dec 31 13:51:45 CST 2017]; root of context hierarchy
2017-12-31 13:51:45.364 WARN 30612 --- [kground-preinit] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath
2017-12-31 13:51:46.101 WARN 30612 --- [kground-preinit] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath
2017-12-31 13:51:48.480 INFO 30612 --- [ main] o.h.v.i.engine.ValidatorFactoryImpl : HV000238: Temporal validation tolerance set to 0.
2017-12-31 13:51:49.411 INFO 30612 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2017-12-31 13:51:49.443 INFO 30612 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2017-12-31 13:51:49.446 INFO 30612 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.23
2017-12-31 13:51:49.478 INFO 30612 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/Users/jack/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.]
2017-12-31 13:51:49.659 INFO 30612 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-12-31 13:51:49.660 INFO 30612 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 4574 ms
2017-12-31 13:51:49.833 WARN 30612 --- [ost-startStop-1] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath
2017-12-31 13:51:49.884 INFO 30612 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-12-31 13:51:49.892 INFO 30612 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/]
2017-12-31 13:51:49.893 INFO 30612 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/]
2017-12-31 13:51:49.894 INFO 30612 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/]
2017-12-31 13:51:49.894 INFO 30612 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/]
2017-12-31 13:51:50.063 WARN 30612 --- [ main] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath
2017-12-31 13:51:50.167 INFO 30612 --- [ main] o.h.v.i.engine.ValidatorFactoryImpl : HV000238: Temporal validation tolerance set to 0.
2017-12-31 13:51:50.296 WARN 30612 --- [ main] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath
2017-12-31 13:51:50.353 WARN 30612 --- [ main] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath
2017-12-31 13:51:50.355 WARN 30612 --- [ main] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath
2017-12-31 13:51:50.436 INFO 30612 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@63355449: startup date [Sun Dec 31 13:51:45 CST 2017]; root of context hierarchy
2017-12-31 13:51:50.607 INFO 30612 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-12-31 13:51:50.608 INFO 30612 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-12-31 13:51:50.651 INFO 30612 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-31 13:51:50.651 INFO 30612 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-31 13:51:50.669 WARN 30612 --- [ main] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath
2017-12-31 13:51:50.711 INFO 30612 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-12-31 13:51:50.955 INFO 30612 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2017-12-31 13:51:51.083 INFO 30612 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2017-12-31 13:51:51.089 INFO 30612 --- [ main] c.e.s.d.Demo1AddServletApplicationKt : Started Demo1AddServletApplicationKt in 8.173 seconds (JVM running for 10.559)

image.png

package org.springframework.boot.autoconfigure.web.servlet.error;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.Servlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.aop.framework.autoproxy.AutoProxyUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionMessage;
import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
import org.springframework.boot.autoconfigure.condition.SearchStrategy;
import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
import org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider;
import org.springframework.boot.autoconfigure.template.TemplateAvailabilityProviders;
import org.springframework.boot.autoconfigure.web.ResourceProperties;
import org.springframework.boot.autoconfigure.web.ServerProperties;
import org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.web.server.ErrorPage;
import org.springframework.boot.web.server.ErrorPageRegistrar;
import org.springframework.boot.web.server.ErrorPageRegistry;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.boot.web.servlet.error.DefaultErrorAttributes;
import org.springframework.boot.web.servlet.error.ErrorAttributes;
import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.expression.MapAccessor;
import org.springframework.core.Ordered;
import org.springframework.core.type.AnnotatedTypeMetadata;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.util.PropertyPlaceholderHelper.PlaceholderResolver;
import org.springframework.web.servlet.DispatcherServlet;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.view.BeanNameViewResolver;
import org.springframework.web.util.HtmlUtils;

/**
 * {@link EnableAutoConfiguration Auto-configuration} to render errors via an MVC error
 * controller.
 *
 * @author Dave Syer
 * @author Andy Wilkinson
 * @author Stephane Nicoll
 */
@Configuration
@ConditionalOnWebApplication(type = Type.SERVLET)
@ConditionalOnClass({ Servlet.class, DispatcherServlet.class })
// Load before the main WebMvcAutoConfiguration so that the error View is available
@AutoConfigureBefore(WebMvcAutoConfiguration.class)
@EnableConfigurationProperties({ ServerProperties.class, ResourceProperties.class })
public class ErrorMvcAutoConfiguration {

    private final ServerProperties serverProperties;

    private final List<ErrorViewResolver> errorViewResolvers;

    public ErrorMvcAutoConfiguration(ServerProperties serverProperties,
            ObjectProvider<List<ErrorViewResolver>> errorViewResolversProvider) {
        this.serverProperties = serverProperties;
        this.errorViewResolvers = errorViewResolversProvider.getIfAvailable();
    }

    @Bean
    @ConditionalOnMissingBean(value = ErrorAttributes.class, search = SearchStrategy.CURRENT)
    public DefaultErrorAttributes errorAttributes() {
        return new DefaultErrorAttributes(
                this.serverProperties.getError().isIncludeException());
    }

    @Bean
    @ConditionalOnMissingBean(value = ErrorController.class, search = SearchStrategy.CURRENT)
    public BasicErrorController basicErrorController(ErrorAttributes errorAttributes) {
        return new BasicErrorController(errorAttributes, this.serverProperties.getError(),
                this.errorViewResolvers);
    }

    @Bean
    public ErrorPageCustomizer errorPageCustomizer() {
        return new ErrorPageCustomizer(this.serverProperties);
    }

    @Bean
    public static PreserveErrorControllerTargetClassPostProcessor preserveErrorControllerTargetClassPostProcessor() {
        return new PreserveErrorControllerTargetClassPostProcessor();
    }

    @Configuration
    static class DefaultErrorViewResolverConfiguration {

        private final ApplicationContext applicationContext;

        private final ResourceProperties resourceProperties;

        DefaultErrorViewResolverConfiguration(ApplicationContext applicationContext,
                ResourceProperties resourceProperties) {
            this.applicationContext = applicationContext;
            this.resourceProperties = resourceProperties;
        }

        @Bean
        @ConditionalOnBean(DispatcherServlet.class)
        @ConditionalOnMissingBean
        public DefaultErrorViewResolver conventionErrorViewResolver() {
            return new DefaultErrorViewResolver(this.applicationContext,
                    this.resourceProperties);
        }

    }

    @Configuration
    @ConditionalOnProperty(prefix = "server.error.whitelabel", name = "enabled", matchIfMissing = true)
    @Conditional(ErrorTemplateMissingCondition.class)
    protected static class WhitelabelErrorViewConfiguration {

        private final SpelView defaultErrorView = new SpelView(
                "<html><body><h1>Whitelabel Error Page</h1>"
                        + "<p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p>"
                        + "<div id='created'>${timestamp}</div>"
                        + "<div>There was an unexpected error (type=${error}, status=${status}).</div>"
                        + "<div>${message}</div></body></html>");

        @Bean(name = "error")
        @ConditionalOnMissingBean(name = "error")
        public View defaultErrorView() {
            return this.defaultErrorView;
        }

        // If the user adds @EnableWebMvc then the bean name view resolver from
        // WebMvcAutoConfiguration disappears, so add it back in to avoid disappointment.
        @Bean
        @ConditionalOnMissingBean(BeanNameViewResolver.class)
        public BeanNameViewResolver beanNameViewResolver() {
            BeanNameViewResolver resolver = new BeanNameViewResolver();
            resolver.setOrder(Ordered.LOWEST_PRECEDENCE - 10);
            return resolver;
        }

    }

    /**
     * {@link SpringBootCondition} that matches when no error template view is detected.
     */
    private static class ErrorTemplateMissingCondition extends SpringBootCondition {

        @Override
        public ConditionOutcome getMatchOutcome(ConditionContext context,
                AnnotatedTypeMetadata metadata) {
            ConditionMessage.Builder message = ConditionMessage
                    .forCondition("ErrorTemplate Missing");
            TemplateAvailabilityProviders providers = new TemplateAvailabilityProviders(
                    context.getClassLoader());
            TemplateAvailabilityProvider provider = providers.getProvider("error",
                    context.getEnvironment(), context.getClassLoader(),
                    context.getResourceLoader());
            if (provider != null) {
                return ConditionOutcome
                        .noMatch(message.foundExactly("template from " + provider));
            }
            return ConditionOutcome
                    .match(message.didNotFind("error template view").atAll());
        }

    }

    /**
     * Simple {@link View} implementation that resolves variables as SpEL expressions.
     */
    private static class SpelView implements View {

        private final NonRecursivePropertyPlaceholderHelper helper;

        private final String template;

        private volatile Map<String, Expression> expressions;

        SpelView(String template) {
            this.helper = new NonRecursivePropertyPlaceholderHelper("${", "}");
            this.template = template;
        }

        @Override
        public String getContentType() {
            return "text/html";
        }

        @Override
        public void render(Map<String, ?> model, HttpServletRequest request,
                HttpServletResponse response) throws Exception {
            if (response.getContentType() == null) {
                response.setContentType(getContentType());
            }
            Map<String, Object> map = new HashMap<>(model);
            map.put("path", request.getContextPath());
            PlaceholderResolver resolver = new ExpressionResolver(getExpressions(), map);
            String result = this.helper.replacePlaceholders(this.template, resolver);
            response.getWriter().append(result);
        }

        private Map<String, Expression> getExpressions() {
            if (this.expressions == null) {
                synchronized (this) {
                    ExpressionCollector expressionCollector = new ExpressionCollector();
                    this.helper.replacePlaceholders(this.template, expressionCollector);
                    this.expressions = expressionCollector.getExpressions();
                }
            }
            return this.expressions;
        }

    }

    /**
     * {@link PlaceholderResolver} to collect placeholder expressions.
     */
    private static class ExpressionCollector implements PlaceholderResolver {

        private final SpelExpressionParser parser = new SpelExpressionParser();

        private final Map<String, Expression> expressions = new HashMap<>();

        @Override
        public String resolvePlaceholder(String name) {
            this.expressions.put(name, this.parser.parseExpression(name));
            return null;
        }

        public Map<String, Expression> getExpressions() {
            return Collections.unmodifiableMap(this.expressions);
        }

    }

    /**
     * SpEL based {@link PlaceholderResolver}.
     */
    private static class ExpressionResolver implements PlaceholderResolver {

        private final Map<String, Expression> expressions;

        private final EvaluationContext context;

        ExpressionResolver(Map<String, Expression> expressions, Map<String, ?> map) {
            this.expressions = expressions;
            this.context = getContext(map);
        }

        private EvaluationContext getContext(Map<String, ?> map) {
            StandardEvaluationContext context = new StandardEvaluationContext();
            context.addPropertyAccessor(new MapAccessor());
            context.setRootObject(map);
            return context;
        }

        @Override
        public String resolvePlaceholder(String placeholderName) {
            Expression expression = this.expressions.get(placeholderName);
            return escape(expression == null ? null : expression.getValue(this.context));
        }

        private String escape(Object value) {
            return HtmlUtils.htmlEscape(value == null ? null : value.toString());
        }

    }

    /**
     * {@link WebServerFactoryCustomizer} that configures the server's error pages.
     */
    private static class ErrorPageCustomizer implements ErrorPageRegistrar, Ordered {

        private final ServerProperties properties;

        protected ErrorPageCustomizer(ServerProperties properties) {
            this.properties = properties;
        }

        @Override
        public void registerErrorPages(ErrorPageRegistry errorPageRegistry) {
            ErrorPage errorPage = new ErrorPage(
                    this.properties.getServlet().getServletPrefix()
                            + this.properties.getError().getPath());
            errorPageRegistry.addErrorPages(errorPage);
        }

        @Override
        public int getOrder() {
            return 0;
        }

    }

    /**
     * {@link BeanFactoryPostProcessor} to ensure that the target class of ErrorController
     * MVC beans are preserved when using AOP.
     */
    static class PreserveErrorControllerTargetClassPostProcessor
            implements BeanFactoryPostProcessor {

        @Override
        public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
                throws BeansException {
            String[] errorControllerBeans = beanFactory
                    .getBeanNamesForType(ErrorController.class, false, false);
            for (String errorControllerBean : errorControllerBeans) {
                try {
                    beanFactory.getBeanDefinition(errorControllerBean).setAttribute(
                            AutoProxyUtils.PRESERVE_TARGET_CLASS_ATTRIBUTE, Boolean.TRUE);
                }
                catch (Throwable ex) {
                    // Ignore
                }
            }
        }

    }

}

exclude, 有异常不会找默认error页面了，而是直接输出字符串

package com.easy.springboot.demo1_add_servlet

import org.springframework.boot.autoconfigure.EnableAutoConfiguration
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration
import org.springframework.boot.runApplication

@SpringBootApplication
@EnableAutoConfiguration(exclude = [ErrorMvcAutoConfiguration::class]) // exclude, 有异常不会找默认error页面了，而是直接输出字符串
class Demo1AddServletApplication

fun main(args: Array<String>) {
    runApplication<Demo1AddServletApplication>(*args)
}

image.png

HelloWorldServlet.kt

package com.easy.springboot.demo1_add_servlet.servlet

import com.fasterxml.jackson.databind.ObjectMapper
import javax.servlet.annotation.WebServlet
import javax.servlet.http.HttpServlet
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse


@WebServlet(urlPatterns=["/hello"])
class HelloWorldServlet : HttpServlet() {

    override fun doGet(req: HttpServletRequest, resp: HttpServletResponse) {
        println("Invoke doGet: req = $req, resp = $resp")
        doPost(req, resp)
    }

    override fun doPost(req: HttpServletRequest, resp: HttpServletResponse) {
        println("Invoke doPost: req = $req, resp = $resp")
        resp.contentType = "application/json"
        val om = ObjectMapper()
        val resultJson = om.writeValueAsString(User("你好，World", "10000000001"))
        val out = resp.writer
        out.println(resultJson)
    }

    data class User(var username: String, var id: String)

}

@WebServlet(urlPatterns=["/hello"])
@ServletComponentScan

package com.easy.springboot.demo1_add_servlet

import org.springframework.boot.autoconfigure.EnableAutoConfiguration
import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration
import org.springframework.boot.runApplication
import org.springframework.boot.web.servlet.ServletComponentScan

@SpringBootApplication
@EnableAutoConfiguration(exclude = [ErrorMvcAutoConfiguration::class]) // exclude, 有异常不会找默认error页面了，而是直接输出字符串
@ServletComponentScan
class Demo1AddServletApplication

fun main(args: Array<String>) {
    runApplication<Demo1AddServletApplication>(*args)
}

image.png

中文乱码：

image.png

ISO-8859-1是单字节编码，自身不能显示中文。

ISO-8859-1编码是单字节编码，向下兼容ASCII，其编码范围是0x00-0xFF，0x00-0x7F之间完全和ASCII一致，0x80-0x9F之间是控制字符，0xA0-0xFF之间是文字符号。

此字符集支持部分于欧洲使用的语言，包括阿尔巴尼亚语、巴斯克语、布列塔尼语、加泰罗尼亚语、丹麦语、荷兰语、法罗语、弗里西语、加利西亚语、德语、格陵兰语、冰岛语、爱尔兰盖尔语、意大利语、拉丁语、卢森堡语、挪威语、葡萄牙语、里托罗曼斯语、苏格兰盖尔语、西班牙语及瑞典语。

package com.easy.springboot.demo1_add_servlet.servlet

import com.fasterxml.jackson.databind.ObjectMapper
import javax.servlet.annotation.WebServlet
import javax.servlet.http.HttpServlet
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse


@WebServlet(urlPatterns = ["/hello"])
class HelloWorldServlet : HttpServlet() {

    override fun doGet(req: HttpServletRequest, resp: HttpServletResponse) {
        println("Invoke doGet: req.requestURI = ${req.requestURI}, resp.contentType = ${resp.contentType}")
        doPost(req, resp)
    }

    override fun doPost(req: HttpServletRequest, resp: HttpServletResponse) {
        println("Invoke doPost ===> ")
        resp.contentType = "application/json;charset=UTF-8"
        val om = ObjectMapper()
        val resultJson = om.writeValueAsString(User("你好，World", "10000000001"))
        val out = resp.writer
        out.println(resultJson)
    }

    data class User(var username: String, var id: String)

}

image.png

后台日志：

2017-12-31 15:14:46.592 INFO 31698 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2017-12-31 15:14:46.598 INFO 31698 --- [ main] c.e.s.d.Demo1AddServletApplicationKt : Started Demo1AddServletApplicationKt in 6.82 seconds (JVM running for 7.848)
Invoke doGet: req.requestURI = /hello, resp.contentType = null
Invoke doPost ===>

如果不加注解 @ServletComponentScan

image.png

这个 Servlet 将不会被注册：

image.png

/** 采用 @Configuration + @Bean 注解的方式 */

package com.easy.springboot.demo1_add_servlet.servlet

import com.fasterxml.jackson.databind.ObjectMapper
import org.springframework.boot.web.servlet.ServletRegistrationBean
import org.springframework.context.annotation.Bean
import org.springframework.context.annotation.Configuration
import javax.servlet.http.HttpServlet
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse

// 不使用 @WebServlet(urlPatterns = ["/what"])
class WhatServlet : HttpServlet() {

    override fun doGet(req: HttpServletRequest, resp: HttpServletResponse) {
        println("Invoke doGet: req.requestURI = ${req.requestURI}, resp.contentType = ${resp.contentType}")
        doPost(req, resp)
    }

    override fun doPost(req: HttpServletRequest, resp: HttpServletResponse) {
        println("Invoke doPost ===> ")
        resp.contentType = "application/json;charset=UTF-8"
        val om = ObjectMapper()
        val resultJson = om.writeValueAsString(What("What Servlet?", "10000000002"))
        val out = resp.writer
        out.println(resultJson)
    }

    data class What(var name: String, var id: String)

}

/** 采用 @Configuration + @Bean 注解的方式 */
@Configuration
class ServletConfig {
    @Bean
    fun servletRegistrationBean(): ServletRegistrationBean<*> {
        return ServletRegistrationBean(WhatServlet(), "/what")
    }

}

image.png

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原文链接：https://yq.aliyun.com/articles/627022

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