十、Struts2返回json数据

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创建javabean

package blog.csdn.net.mchenys.domain;

import java.util.List;

public class User {
	private String username;
	private int age;
	private List<String> hobby;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public List<String> getHobby() {
		return hobby;
	}

	public void setHobby(List<String> hobby) {
		this.hobby = hobby;
	}

}

创建Action

package blog.csdn.net.mchenys.action;

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

import com.opensymphony.xwork2.ActionSupport;

import blog.csdn.net.mchenys.domain.User;

public class TestAction extends ActionSupport {

	private static final long serialVersionUID = 1L;

	// 将会被Struts2序列化为JSON字符串的对象
	private Map<String, Object> dataMap = new HashMap<String, Object>();

	// Struts2序列化指定属性时，必须有该属性的getter方法，实际上，如果没有属性，而只有getter方法也是可以的
	public Map<String, Object> getDataMap() {
		return dataMap;
	}

	public String demo1() {
		List<User> uList = new ArrayList<>();
		dataMap.put("data", uList);
		dataMap.put("status", 0);
		dataMap.put("msg", "请求成功");
		for (int i = 0; i < 5; i++) {
			
			User u = new User();
			u.setUsername("胜哥" + i + "号");
			u.setAge(20 + i);
			
			List<String> hobbyList = new ArrayList<>();
			hobbyList.add("吃");
			hobbyList.add("睡");
			hobbyList.add("玩");
			u.setHobby(hobbyList);
			
			uList.add(u);
		}
		return SUCCESS;
	}

}

配置Struts2配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
	
	<!-- 包名随意,只要能和其他包区分开来就可以了 
		extends:必须继承json-default
		namespace:随意,但是设置了的话,请求路径必须要对应上
	 -->
	<package name="test" extends="json-default" namespace="/user">
		<!-- action请求名用通配符*号表示可以匹配任意字符路径,配合namespace那就是/user/*
			method:响应方法采用{1}读取name中匹配的字符,1表示第一个*代表的路径名
		  -->
		<action name="*" class="blog.csdn.net.mchenys.action.TestAction" method="{1}">
			<!-- 返回结果类型是 json-->
			<result type="json">
				<!-- 返回数据为action中定义的map -->
				<param name="root">dataMap</param>
				<!-- 是否去掉返回值为NULL的properties -->
				<param name="excludeNullProperties">true</param>
			</result>
		</action>
	</package>
</struts>

测试,请求该action的demo1方法的完整路径是http://localhost:8080/shopping/user/demo1,如下所示: