最近花了很多时间,研究Spring MVC 3.2.2 +easyui,实现了这个,前端页面实现个系统就很简单了。
Spring MVC 返回JSON数据的方法
1). 直接 PrintWriter 输出
2). 使用 JSP 视图
3). 使用Spring内置的支持
本文介绍的是第3种方法,方法如下:
1:首先下载JSON的包
这是spring MVC处理json数据时,所必须的jar依赖。
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2:spring mvc的配置文件中加入配置
<?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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:annotation-config /> <context:component-scan base-package="com.kingmed.jusmartcare.health"/> <!-- ②:启动Spring MVC的注解功能,完成请求和注解POJO的映射 --> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <ref bean="jsonHttpMessageConverter"/> </list> </property> </bean> <bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> <property name="contentType" value="text/html; charset=utf-8"/> </bean> </beans>
说明:
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter 的Bean配置中,我们加入了messageConverters属性,在该属性中我们有配置jsonHttpMessageConverter这个 Bean,它就是用来处理json数据转换的。
在jsonHttpMessageConverter的Bean配置中,有一个supportedMediaTypes属性,在这个属性可以添加了 text/html;charset=UTF-8这个值,它是为了处理返回的json数据的编码,默认是ISO-88859-1的,如果出现乱码,可以把 它设置为UTF-8,参考如下:
<bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>text/html;charset=UTF-8</value> </list> </property> </bean>
3:控制器Controller的注解
package com.kingmed.jusmartcare.health.web; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.ModelAttribute; 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; @Controller public class MemberShipController { public static final String LOGIN_SUCCESS = "vipcontent";//Index";// 登陆成功 public static final String LOGIN_FAIL = "../../index";//"LoginFail";// 登陆失败 public static final String LOGOUT = "../../index";// public static final String REGISTER_SUCCESS = "RegisterSuccess";// 注册成功 public static final String REGISTER_FAIL = "RegisterFail";// 注册成功 private static final Logger logger=LoggerFactory.getLogger(MemberShipController.class); @Autowired private HealthconsultService healthconsultService; @RequestMapping("jsp/welcome.do") public String welcom(@RequestParam(value = "ln", required = false) String ln) { String en = ln==null?"":ln+'/'; return en+"welcome"; } @RequestMapping(value="user/list.do",method=RequestMethod.GET) public String list(Model model) throws Exception { return "user/list"; } @RequestMapping(value="jsp/user/queryList.do") @ResponseBody public Map<String, Object> queryList(HttpSession session,@RequestParam(value = "pageNo", required = false) Integer pageNo,@RequestParam(value = "ln", required = false) String ln) throws Exception{ //spring太方便了,可以自动装配两个对象 会自动的装返回的Map转换成JSON对象 Map<String, Object> result = new HashMap<String, Object>(2); String en = ln==null?"":ln+'/'; pageNo = pageNo==null?1:pageNo; Page<Healthconsult> healths=healthconsultService.getPageList("cardno","1001", pageNo,2); int total=healths.getTotalCount(); result.put("total", total); result.put("rows", healths.getResult()); return result; } @RequestMapping(value="jsp/welcome1.do") @ResponseBody public Object test(HttpSession session){ System.out.println("test...................."); MemberInfo logined=(MemberInfo)session.getAttribute("USER_INFO"); if(logined ==null){ logined=new MemberInfo(); logined.setCardNo("999999"); System.out.println("test1...................."); } System.out.println("test2...................."); return logined; } }
说明:使用了一个@ResponseBody的注解,Spring3.0 MVC @ResponseBody的作用是把返回值直接写到HTTP response body里,
返回json数据的可以是一个类(看test),或者list(看queryList)。