IDEA中通过Map返回JSON字符串

项目用到，简单记录下使用方法：

1.项目中要引入struts2-json-plugin.jar包
2.到Project Structure - Facets - Struts2 - File sets - Default File Set 增加 jar 包内的 struts-plugin.xml
3.在Action类中加入如下代码：

package com.action;

import com.biz.IUserBiz;
import com.entity.UserEntity;
import com.opensymphony.xwork2.ActionSupport;

import java.util.List;
import java.util.HashMap;
import java.util.Map;

public class MapUserAction extends ActionSupport{
private String loginName;
private String loginPwd;

//将会被Struts2序列化为JSON字符串的对象，必须有该属性的getter方法
private Map<String, Object> dataMap;
/* 构造方法 */
public MapUserAction() {
dataMap = new HashMap<>();    //初始化Map对象
}
public Map<String, Object> getDataMap() {
return dataMap;
}

public void setLoginName(String loginName){
this.loginName = loginName;
}
public void setLoginPwd(String loginPwd){
this.loginPwd = loginPwd;
}

private IUserBiz userBiz;

public void setUserBiz(IUserBiz userBiz){
this.userBiz = userBiz;
}

/** 测试通过action以Struts2默认方式返回JSON数据 **/
public String MapToJSON() throws Exception {
List list = userBiz.login(loginName,loginPwd);
if(list.size()>0){
UserEntity user = (UserEntity)list.iterator().next();
// dataMap中的数据将会被Struts2转换成JSON字符串，所以这里要先清空其中的数据
dataMap.clear();
dataMap.put("ID",user.getId());
dataMap.put("Account",user.getAccount());
dataMap.put("Name",user.getName());
dataMap.put("Phone",user.getPhone());
dataMap.put("Type",user.getType());
if(user.getCarListByCar()!= null){
dataMap.put("CarID",user.getCarListByCar().getCarId());
dataMap.put("CarNum",user.getCarListByCar().getCarNum());
dataMap.put("CarName",user.getCarListByCar().getCarName());
dataMap.put("CarModel",user.getCarListByCar().getCarModel());
dataMap.put("CarStatus",user.getCarListByCar().getCarStatus());
}
dataMap.put("loginStatus","True");
return SUCCESS;
}else {
dataMap.clear();
dataMap.put("loginStatus","False");
return SUCCESS;
}
}
}

4.接下来配置Spring-config.xml

<bean id ="userDao" class="com.dao.UserDaoImpl">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>

<bean id = "userBiz" class="com.biz.UserBiz">
<property name="userDao" ref="userDao"/>
</bean>

<bean id="mapAction" class="com.action.MapUserAction" scope="prototype">
<property name="userBiz" ref="userBiz"/>
</bean>

5.下面配置Struts.xml

<package name="json" extends="json-default" namespace="/Test">

<action name="MapTest" class="mapAction" method="MapToJSON">
<result type="json"><!--默认序列化返回所有getter方法-->
<param name="root">dataMap</param><!-- root 返回 dataMap 注释掉将返回全部 -->

<!--<param name="excludeNullProperties">true</param>-->
<!--<param name="excludeProperties">loginPwd</param>-->

</result>

</action>

</package>