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SSM-SpringMVC-32：SpringMVC中灌顶传授文件上传

日期：2018-04-01点击：309收藏

------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------

我将用自认为最简单的语言，描述Springmvc的文件上传，来将老夫毕生功力灌顶传授给你

首先文件上传，又简至深

前提有吗？jar包，form表单里的属性（method="post" enctype="multipart/form-data"）

jar包的节点我给出来：

 <!--文件上传的jar包--> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>1.4</version> </dependency>

下面我开始我第一个案例，最简单的文件上传：

1.jsp页面：fileupload.jsp

<%-- Created by IntelliJ IDEA. User: Dawn Date: 2018/4/2 Time: 14:19 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>文件上传</title> </head> <body> <h1>文件上传</h1> <form action="${pageContext.request.contextPath}/fileuploadfirst" method="post" enctype="multipart/form-data"> 文件1 <input type="file" name="upload"/> <input type="submit"/> </form> </body> </html>

success.jsp

<%-- Created by IntelliJ IDEA. User: Dawn Date: 2018/4/2 Time: 14:19 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>成功</title> </head> <body> <h1>SUCCESS</h1> </body> </html>

2.在webapp下你jsp页面的那个包下创建一个文件夹，我的叫upload，里面随便扔个东西，编译后，如果即使这样target目录下还没有upload这个文件夹的话，就手动创建

3.创建处理器和处理方法

package cn.dawn.day24fileupload; import com.sun.org.glassfish.gmbal.ParameterNames; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpSession; import java.io.File; import java.io.IOException; /** * Created by Dawn on 2018/4/2. */ @Controller public class FileupLoad { /*最初始版本*/ @RequestMapping("/fileuploadfirst") public String fileuploadfirst(MultipartFile upload, HttpSession session){ /*获取上传文件的简单名称例如 1.txt*/ String childrlPath = upload.getOriginalFilename(); /*获得一个真实路径*/ String parentPath = session.getServletContext().getRealPath("/day24/upload"); /*获取一个完整的文件对象*/ File file=new File(parentPath,childrlPath); /*传输创建到本地*/ try { upload.transferTo(file); /*上传成功*/ return "success"; } catch (IOException e) { e.printStackTrace(); } /*上传失败*/ return "fileupload"; } }

4.自己的xml配置文件：这儿其实我想删减点的，文件名中文的处理和文件大小限制放在后面讲也行，不过放在这儿，你们应该也能理解

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--包扫描器--> <context:component-scan base-package="cn.dawn.day24fileupload"></context:component-scan> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/day24/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--多部分文件解析器--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!--文件名的编码--> <property name="defaultEncoding" value="UTF-8"></property> <!--限制文件大小--><!--这个单位是byte，我这儿限制的是20mb最大容量--> <property name="maxUploadSize" value="20971520"></property> </bean> <!--绑定注解驱动--> <mvc:annotation-driven></mvc:annotation-driven> </beans>

5.web.xml中修改中央处理器的上下文配置参数为上面那个xml

6.启动tomcat，访问fileupload.jsp页面

第二个案例：多文件上传

1.jsp页面fileuploadmore.jsp：

<%-- Created by IntelliJ IDEA. User: Dawn Date: 2018/4/2 Time: 14:19 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>文件上传</title> </head> <body> <h1>文件上传</h1> <form action="${pageContext.request.contextPath}/fileuploadsecond" method="post" enctype="multipart/form-data"> 文件1 <input type="file" name="upload"/> 文件2 <input type="file" name="upload"/> 文件3 <input type="file" name="upload"/> <input type="submit"/> </form> </body> </html>

success.jsp

<%-- Created by IntelliJ IDEA. User: Dawn Date: 2018/4/2 Time: 14:19 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>成功</title> </head> <body> <h1>SUCCESS</h1> </body> </html>

2.处理器处理方法

package cn.dawn.day24fileupload; import com.sun.org.glassfish.gmbal.ParameterNames; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpSession; import java.io.File; import java.io.IOException; /** * Created by Dawn on 2018/4/2. */ @Controller public class FileupLoad { /*多文件版本*/ @RequestMapping("/fileuploadsecond") public String fileuploadsecond(@RequestParam MultipartFile[] upload, HttpSession session){ for (MultipartFile item :upload) { if(item.getSize()>0) { /*获取上传文件的简单名称例如 1.txt*/ String childrlPath = item.getOriginalFilename(); /*获得一个真实路径*/ String parentPath = session.getServletContext().getRealPath("/day24/upload"); /*获取一个完整的文件对象*/ File file = new File(parentPath, childrlPath); /*传输创建到本地*/ try { item.transferTo(file); /*上传成功*/ } catch (IOException e) { e.printStackTrace(); return "fileuploadmore"; } } } /*上传失败*/ return "success"; } /*最初始版本*/ @RequestMapping("/fileuploadfirst") public String fileuploadfirst(MultipartFile upload, HttpSession session){ /*获取上传文件的简单名称例如 1.txt*/ String childrlPath = upload.getOriginalFilename(); /*获得一个真实路径*/ String parentPath = session.getServletContext().getRealPath("/day24/upload"); /*获取一个完整的文件对象*/ File file=new File(parentPath,childrlPath); /*传输创建到本地*/ try { upload.transferTo(file); /*上传成功*/ return "success"; } catch (IOException e) { e.printStackTrace(); } /*上传失败*/ return "fileupload"; } }

3.自己的xml配置文件

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--包扫描器--> <context:component-scan base-package="cn.dawn.day24fileupload"></context:component-scan> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/day24/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--多部分文件解析器--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!--文件名的编码--> <property name="defaultEncoding" value="UTF-8"></property> <!--限制文件大小--><!--这个单位是byte，我这儿限制的是20mb最大容量--> <property name="maxUploadSize" value="20971520"></property> </bean> <!--绑定注解驱动--> <mvc:annotation-driven></mvc:annotation-driven> </beans>