springmvc + spring + mybatis + easyui 在这一套应用中，easyui界面的json特殊格式，要用springmvc返回。

EmpController.java

          /**
           * 返回json格式为：
           * {"total":"2","rows":[{"id":"142318","firstname":"kkk","lastname":"Popoviceww","phone":"l","email":"dfgd@te.com"},{"id":"142322","firstname":"Hello","lastname":"there","phone":"","email":""}]}
           */
          @RequestMapping("doGetEmpList")
	@ResponseBody
	public Map<String, Object> doGetEmpList(){
		
		List<DrdgEmp> modelList = drdgEmpService.selectModelList();
		//获得的list集合装填到map集合
		Map<String, Object> map = new HashMap<String, Object>();
		//同时把total状态上
		map.put("total", String.valueOf(modelList.size()));
		map.put("rows", modelList);
		//返回的map结合会自动转换为json格式
		return map;
	}

EntryOrJsonController.java

//现在对注解进行配置【详细配置】

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;
	}
}

spring-mybatis.xml

<!--
首先要引入相应jar包
jackson-core-asl.jar
jackson-mapper-as.jar
-->

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:mvc="http://www.springframework.org/schema/mvc" 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/context 
	http://www.springframework.org/schema/context/spring-context-3.0.xsd 
	http://www.springframework.org/schema/mvc 
	http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

	<!-- 自动扫描controller包下的所有类，使其认为spring mvc的控制器 对于使用根据自己的配置来用-->
	<context:component-scan base-package="com.drdg.*.controller" />

	<!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->
	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver"
		p:prefix="/" p:suffix=".jsp" />

	<!-- 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" ref="mappingJacksonHttpMessageConverter"></property>   
           </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>    
      
</beans>