SpringMVC+ajax返回JSON串

一、引言

本文使用springMVC和ajax做的一个小小的demo，实现将JSON对象返回到页面，没有什么技术含量，纯粹是因为最近项目中引入了springMVC框架。

二、入门例子

①. 建立工程,并导入相应spring jar包和解析json的包fastjson。

②. 在web.xml文件中配置Spring的核心类DispatcherServlet

③. 配置Spring的核心配置文件spring-servlet.xml

④. 编写实体类Person

public class Person { 
    private String name; 
    private Integer age; 
   
    public String getName() { 
        return name; 
    } 
   
    public void setName(String name) { 
        this.name = name; 
    } 
   
    public Integer getAge() { 
        return age; 
    } 
   
    public void setAge(Integer age) { 
        this.age = age; 
    } 
   
    public String toString() { 
        return "[name: " + name + ", age: " + age + "]"; 
    } 
}

⑤. 编写控制器类PersonControll

@Controller 
public class PersonControll { 
    @RequestMapping("toAjax.do") 
    public String toAjax() { 
        return "ajax"; 
    } 
       
    @RequestMapping(value = "ajax.do", method = RequestMethod.GET) 
    public void ajax(@ModelAttribute Person person,PrintWriter printWriter) { 
        System.out.println(person); 
        String jsonString = JSON.toJSONString(person, SerializerFeature.PrettyFormat); 
        printWriter.write(jsonString); 
        printWriter.flush(); 
        printWriter.close(); 
    } 
}

⑥. 编写访问页面ajax.jsp

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
    <head> 
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
        <title>ajax for springMVC</title> 
        <script type="text/javascript" src="js/jquery-1.6.2.min.js"></script> 
        <script type="text/javascript"> 
            $(function() { 
                $("#click").click(function() { 
                    $.ajax( { 
                        type : "GET", 
                        url : "ajax.do", 
                        data : "name=zhangsan&age=20", 
                        dataType: "text", 
                        success : function(msg) { 
                            alert(msg); 
                        } 
                    }); 
                }); 
            }); 
        </script> 
    </head> 
    <body> 
        <input id="click" type="button" value="click to show person" /> 
    </body> 
</html>

⑦. 访问url: http://localhost:8080/springMVC/toAjax.do