Spring之json

转自：http://exceptioneye.iteye.com/blog/1300672

一、准备工作

1、 下载依赖库jar包

   Jackson的jar all下载地址：http://wiki.fasterxml.com/JacksonDownload

   jackson-core-asl.jar

   jackson-mapper-as.jar

二、修改配置文件spmvc-servlet.xml

   

<?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:mvc="http://www.springframework.org/schema/mvc"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:util="http://www.springframework.org/schema/util"
        xsi:schemaLocation="
          http://www.springframework.org/schema/beans
          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
          http://www.springframework.org/schema/mvc/spring-mvc
          http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
          http://www.springframework.org/schema/context
          http://www.springframework.org/schema/context/spring-context-3.0.xsd
          http://www.springframework.org/schema/util
          http://www.springframework.org/schema/util/spring-util-2.0.xsd">

    <!-- 自动扫描注解的Controller -->
    <context:component-scan base-package="com.wy.controller.annotation" />

    <!-- 处理在类级别上的@RequestMapping注解-->
    <bean
        class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
    <!-- 处理方法级别上的@RequestMapping注解-->
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >
        <property name="messageConverters">
            <util:list id="beanList">
                <ref bean="mappingJacksonHttpMessageConverter"/>
            </util:list>
        </property>
    </bean>

    <!-- 视图解析器策略 和 视图解析器 -->
    <!-- 对JSTL提供良好的支持 -->
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 默认的viewClass,可以不用配置
        <property name="viewClass" value="org.springframework.web.servlet.view.InternalResourceView" />
         -->
        <property name="prefix" value="/WEB-INF/page/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 处理JSON数据转换的 -->
    <bean id="mappingJacksonHttpMessageConverter"
        class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
        <!-- 为了处理返回的JSON数据的编码，默认是ISO-88859-1的，这里把它设置为UTF-8,解决有乱码的情况 -->
        <property name="supportedMediaTypes">
            <list>
                  <value>text/html;charset=UTF-8</value>
            </list>
        </property>
    </bean>


    <!--
       ResourceBundleViewResolver通过basename所指定的ResourceBundle解析视图名。
                  对每个待解析的视图，ResourceBundle里的[视图名].class所对应的值就是实现该视图的类。
                  同样，[视图名].url所对应的值是该视图所对应的URL。
                  可以指定一个parent view，其它的视图都可以从parent view扩展。
                  用这种方法，可以声明一个默认的视图。

    <bean id="messageSource"
        class="org.springframework.context.support.ResourceBundleMessageSource">
        <property name="basename" value="welcome" />
    </bean>
    -->

</beans>

 

 

 二、注解的Controller

 

 

package com.wy.controller.annotation;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.bind.annotation.RequestBody;
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.servlet.ModelAndView;

import com.wy.pojo.User;

/**
 * SpringMVC 注解 内置支持
 * @author Administrator
 *
 */
@Controller
@RequestMapping("/entryOrJsonController")
public class EntryOrJsonController {

    private Logger log = Logger.getLogger(EntryOrJsonController.class);

    /**
     * 输入为JSON格式的数据的方式
     * 1、@RequestBody 将httpRequest的body绑定到方法参数上
     * @param param
     * @return
     */
    @RequestMapping(value = "/annotationParam", method = RequestMethod.POST)
    public ModelAndView annotationParam(@RequestBody User user){
        ModelAndView mav = new ModelAndView();
        log.info("============"+user);
        mav.setViewName("welcome");
        return mav;
    }

    /**
     * 输出为JSON格式的数据的方式
     * 1、@ResponseBody的作用是把返回值直接写到HTTP response body里
     * @param session
     * @return
     * @throws ServletRequestBindingException
     */
    @RequestMapping(value = "/commonReturnType" , method = RequestMethod.GET)
    @ResponseBody
    public ModelAndView commonReturnType(HttpSession session) throws ServletRequestBindingException{
        ModelAndView mav = new ModelAndView();
        session.setAttribute("userName", "使用ResponseBody输出！");
        log.info("=================使用ResponseBody输出====================");
        ModelMap modelMap = new ModelMap();
        modelMap.put("mapKey", "mapValue");
        modelMap.addAttribute("attributeKey", "attributeValue");

        mav.addObject("model", modelMap);
        mav.addObject("modelMap", modelMap);
        mav.setViewName("welcome");
        return mav;
    }

    /**
     * 输出为JSON格式的数据的方式
     * 2、ResponseEntity<?>
     * @return
     */
    @RequestMapping(value = "/annotationReturnType" , method = RequestMethod.GET)
    public ResponseEntity<String> annotationReturnType(){
        log.info("=================使用ResponseEntity<?>输出====================");
        HttpHeaders httpHeaders = new HttpHeaders();
        ResponseEntity<String> responseEntity = new ResponseEntity<String>("Hello WY!", httpHeaders, HttpStatus.CREATED);
        return responseEntity;
    }

    /**
     * 输入 和输出为JSON格式的数据的方式
     * 3、HttpEntity<?> ResponseEntity<?>
     * @param u
     * @return
     */
    @RequestMapping(value = "/annotationParamsReturn", method = RequestMethod.GET)
    @ResponseBody
    public ResponseEntity<String> annotationParamsReturn(HttpEntity<User> user){
        String temp = user.getBody().getUsername();
        ResponseEntity<String> responseResult = new ResponseEntity<String>(temp, HttpStatus.OK);
        return responseResult;
    }

    /**
     *
     * @param request
     * @param session
     * @return
     * @throws ServletRequestBindingException
     */
    @RequestMapping(value = "/login" , method = RequestMethod.GET)
    public ModelAndView login(HttpServletRequest request, HttpSession session) throws ServletRequestBindingException{
        ModelAndView mav = new ModelAndView();
        String userName = request.getParameter("userName");
        String password = ServletRequestUtils.getStringParameter(request, "password");
        log.info("============================\r\n接收到的参数: "+userName+" "+password);
        session.setAttribute("userName", userName);
        mav.setViewName("welcome");
        return mav;
    }
}