一.除了搭建springmvc框架需要的jar包外,还需要这两个jar包
jackson-core-asl-1.9.2.jar和jackson-mapper-asl-1.9.2.jar
二.web,.xml配置
classpath:spring-servlet.xml指定springmvc配置文件的位置
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-servlet.xml</param-value>
</init-param>
<!-- 可以自定义servlet.xml配置文件的位置和名称，默认为WEB-INF目录下，名称为[<servlet-name>]-servlet.xml，如spring-servlet.xml
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-servlet.xml</param-value> 默认
</init-param>
-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
三.spring-servlet.xml配置
通过此配置,将实体类自动返回为json格式的数据
<?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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"> <!-- 启用spring mvc 注解 --> <context:annotation-config /> <!-- 设置使用注解的类所在的jar包 --> <context:component-scan base-package="me.mvc,me.base"></context:component-scan> <!-- 完成请求和注解POJO的映射 --> <!-- <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" /> --> <!-- 对转向页面的路径解析。prefix：前缀， suffix：后缀 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/jsp/" p:suffix=".jsp" />
<!-- 通过实体类返回json格式数据的关键配置 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <!--返回字符串格式json--> <value>application/json;charset=UTF-8</value> </list> </property> </bean> </list> </property> </bean> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="102400000"></property> </bean> </beans>
四,后台java代码
package me.mvc; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.annotation.Resource; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import me.mvc.service.testmvcDao; import net.sf.json.JSONArray; import org.apache.struts2.ServletActionContext; import org.springframework.http.HttpRequest; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import org.springframework.web.servlet.ModelAndView; @Controller @RequestMapping("/mvc/*") public class testmvc { @RequestMapping(method=RequestMethod.GET,value="/hello22index.do")//第一步访问hello2页面 public String index2() { return "hello2"; } @ResponseBody @RequestMapping(method=RequestMethod.POST,value="/hello22.do")//第二步前台发送ajax请求调用此方法并返回json数据 public User index2post(String testname1 ,HttpServletResponse response) throws IOException { System.out.println("*************:"+testname1); User u=new User(); u.setUsername("name"); u.setUserpassword("pass"); return u; } }
五.前端页面
该方法sendajax()将向后台发送请求,调用index2post()方法,返回json数据格式
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript" src="../../js/jquery-1.12.0.js"></script>
<base href="<%=basePath%>">
<title>My JSP 'hello2.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<script type="text/javascript" src="<%=path%>/js/jquery-1.12.0.js"></script></head>
<body>
<input type="text" name="testname" id="testname1">
<input type="button" value="ajax提交" onclick="sendajax()">
</form>
</body>
<script type="text/javascript">
function sendajax()
{
var testname1=$("#testname1").val();
alert(testname1);
$.ajax({
type: "post",
url: "<%=path%>/mvc/hello22.do",
data: {testname1:testname1},
dataType: "json",
success: function (data) {
alert(data.username);
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert("系统繁忙,请稍后重试!");
}
});
}
</script>
</html>