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处理器的方法我们之前做过，返回值为String的，返回值为ModelAndView的，我们这个讲的这个返回值void的做什么的？
答：最主要的是ajax的时候用的
案例如下：
俩个类：实体类UserInfo和处理器类：
UserInfo类：
package cn.dawn.day12return;
/**
* Created by Dawn on 2018/3/26.
*/
public class UserInfo {
private String username;
private String password;
public UserInfo() {
}
public UserInfo(String username, String password) {
this.username = username;
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
自定义的处理器类：
package cn.dawn.day12return;
import com.alibaba.fastjson.JSON;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Dawn on 2018/3/26.
*/
@Controller
public class MyReturnDemoController {
@RequestMapping("/doreturnVoidAjax")
public void doreturnVoidAjax(HttpServletResponse response) throws IOException {
List<UserInfo> lists=new ArrayList<UserInfo>();
UserInfo u1=new UserInfo("M","123");
UserInfo u2=new UserInfo("6","123");
lists.add(u1);
lists.add(u2);
String json = JSON.toJSONString(lists);
response.getWriter().write(json);
}
}
此处用到了阿里的fastjson的jar包，自已引一个即可，不说这个jar了
自己的xml配置文件：
package cn.dawn.day12return;
import com.alibaba.fastjson.JSON;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Dawn on 2018/3/26.
*/
@Controller
public class MyReturnDemoController {
@RequestMapping("/doreturnVoidAjax")
public void doreturnVoidAjax(HttpServletResponse response) throws IOException {
List<UserInfo> lists=new ArrayList<UserInfo>();
UserInfo u1=new UserInfo("M","123");
UserInfo u2=new UserInfo("6","123");
lists.add(u1);
lists.add(u2);
String json = JSON.toJSONString(lists);
response.getWriter().write(json);
}
}
在web.xml中把中央调度器调度到自己当前写的这个xml配置文件，再解决乱码，再解决静态资源js不能引用的问题
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<!--过滤器处理乱码-->
<filter>
<filter-name>CharacterEncoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<!--请求-->
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
<!--响应-->
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--中央调度器-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:ApplicationContext-day12return.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--第一种方式--><!--解决静态资源不能引用-->
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.js</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.css</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.jpg</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.png</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.gif</url-pattern>
</servlet-mapping>
</web-app>
jsp页面
<%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %>
<html>
<head>
<title>Ajax</title>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.8.3.min.js"></script>
<script type="text/javascript">
$(function () {
$("input").on("click",function () {
$.ajax({
url:"${pageContext.request.contextPath}/doreturnVoidAjax",
type:"POST",
data:{},
success:function (data) { //data:String json串 data:Object json对象
//用户名
$.each(eval("("+data+")"),function (i,dom) {
alert(dom.username);
});
}
});
});
});
</script>
</head>
<body>
<%--<img src="image/1.jpg">--%>
<input type="button" value="想发送Ajax？,点我不要赔的喔！！！呵呵哒~~~~~~"/>
</body>
</html>
案例完毕
