SpringMVC 函数返回值问题，返回Json解决方法

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SpringMVC请求处理方法的返回值：

ModelAndViewModelMap包含模型和属性View代表逻辑视图名的Stringvoid提供对Servlet的访问，以响应Http头部和内容的HttpEntity或ResponseEntityCallableDeferredResult其他任意类型，Spring将其视作输出给View的对象模型

返回Json：

package com.fieldsignserver.controller;import java.util.HashMap;import java.util.Map;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.view.json.MappingJacksonJsonView;@Controller@RequestMapping(value="/admin")public class LoginController {    @ResponseBody    @RequestMapping(value="/login",method=RequestMethod.GET)    public ModelAndView login(@RequestParam("username") String username,@RequestParam("password") String password){        Map result = new HashMap<String,String>();        System.out.println("Username : "+username+", Password :"+password);        result.put("result", "success");        return new ModelAndView(new MappingJacksonJsonView(),result);    }}

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