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springmvc中异步发送表单数据到Bean，并响应JSON文本返回

2016-05-05 09:25 519 查看

1）导入jackson-core-asl-1.9.11.jar和jackson-mapper-asl-1.9.11.jar

2）在业务方法的返回值和权限之间使用@ResponseBody注解表示返回值对象需要转成JSON文本

3）在spring.xml配置文件中编写如下代码：

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>
</list>
</property>
</bean>

EmpAction.java

package cn.buaa.javaee.springmvc.app3;
import java.util.ArrayList;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping(value="/emp")
public class EmpAction {
/**
* @ResponseBody Emp 表示让springmvc将Emp对象转成json文本
*/
@RequestMapping(value="/bean2json")
public @ResponseBody Emp bean2json() throws Exception{
//创建Emp对象
Emp emp = new Emp();
emp.setId(1);
emp.setUsername("老四");
emp.setSalary(7000D);
emp.setHiredate(new Date());
return emp;
}

@RequestMapping(value="/listbean2json")
public @ResponseBody List<Emp> listbean2json() throws Exception{
//创建List对象
List<Emp> empList = new ArrayList<Emp>();
//向List对象中添加三个Emp对象
empList.add(new Emp(1,"哈哈",7000D,new Date()));
empList.add(new Emp(2,"嘿嘿",5000D,new Date()));
empList.add(new Emp(3,"呵呵",8000D,new Date()));

return empList;
}

@RequestMapping(value="/mapbean2json")
public @ResponseBody Map<String,Object> maplistbean2json() throws Exception{
//创建List对象
List<Emp> empList = new ArrayList<Emp>();
//向List对象中添加三个Emp对象
empList.add(new Emp(1,"哈哈",7000D,new Date()));
empList.add(new Emp(2,"嘿嘿",5000D,new Date()));
empList.add(new Emp(3,"呵呵",8000D,new Date()));
Map <String,Object> map = new LinkedHashMap<String, Object>();
map.put("total", empList.size());
map.put("rows", empList);
return map;
}

}

bean2json.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>bean2json</title>

<script type="text/javascript" src="js/jquery-1.8.2.js"></script>
</head>

<body>
<input type="button" value="Emp转json"/><p>
<input type="button" value="List<Emp>转json"/><p>
<input type="button" value="Map<String,Object>转json" /><p>

<!--  Map<String,Object>转json   -->
<script type="text/javascript">
$(":button:last").click(function(){
var url = "${pageContext.request.contextPath}/emp/mapbean2json.action";
var sendData = null;
$.post(url,sendData,function(backData,textStaut,ajax){
alert(ajax.responseText);
});
});
</script>

<!--  List<Emp>转json   -->
<script type="text/javascript">
$(":button:eq(1)").click(function(){
var url = "${pageContext.request.contextPath}/emp/listbean2json.action";
var sendData = null;
$.post(url,sendData,function(backData,textStaut,ajax){
alert(ajax.responseText);
});
});
</script>

<!--  Emp转json   -->
<script type="text/javascript">
$(":button:first").click(function(){
var url = "${pageContext.request.contextPath}/emp/bean2json.action";
var sendData = null;
$.post(url,sendData,function(backData,textStaut,ajax){
//alert(ajax.responseText);
var hiredate = backData.hiredate;
var date = new Date(hiredate);
alert(date.getFullYear() + "年" + (date.getMonth()+1) + "月" + (date.getDate()) + "日");
});
});
</script>

</body>
</html>

Emp.java

package cn.buaa.javaee.springmvc.app3;

import java.util.Date;

public class Emp {

private Integer id;
private String username;
private Double salary;
private Date hiredate;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Double getSalary() {
return salary;
}
public void setSalary(Double salary) {
this.salary = salary;
}
public Date getHiredate() {
return hiredate;
}
public void setHiredate(Date hiredate) {
this.hiredate = hiredate;
}
public Emp(Integer id, String username, Double salary, Date hiredate) {
this.id = id;
this.username = username;
this.salary = salary;
this.hiredate = hiredate;
}
public Emp() {
super();
}

}

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