SpringMVC生成JSON（三）

基于上一篇文章的代码基础上

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;
	}
}