Struts2轉換json

一、javaScript中有兩種Json的語法，一種用於創建對象，另一種用於創建數組。

1.javaScript創建對象

<!-- 簡單類型 -->
<script type="text/javascript">
  var studnt={"no":"s001","name":"ix"};
  alert(studnt.no);
</script>


<!-- 複雜類型 -->
<script type="text/javascript">
  var person={
		  "id":"001",
          "name":"csdn",
          "son":{"no":"s001","name":"ix"},
          "info":function(){document.write("姓名："+this.name+"孩子："+this.son.name);}
  };
  alert(person.info());
</script>

2.javaScript創建數組

<!-- 數組類型 -->
<script type="text/javascript">
  var persons=[{"no":"s001","name":"i1"},{"no":"s002","name":"i2"},{"no":"s003","name":"i3"}];
  alert(persons[1].name);
</script>

二、json數據

1.第一種方法傳回json

	@Override
	// 第一種，直接返回jsp作用域裏
	public String execute() throws Exception {
		User user = new User();
		user.setName("csdn");
		user.setPass("pass");
		user.setAge(20);
		user.setScore(100d);
		user.setGender(true);
		// 聲明JSONObject對象
		JSONObject jo = new JSONObject();
		// 轉化User爲名字爲User的json格式,存放於JSONObject對象
		jo.accumulate("user", user);
		// 存放到session jo.toString()得到轉換後的
		ActionContext.getContext().getSession().put("user", jo.toString());

		return SUCCESS;
	}

User.java

package model;

import java.util.Date;

import org.apache.struts2.json.annotations.JSON;

public class User {
		private String name;
		private String pass;
		private  int age;//private  transient int age;1、早期的？？？
		private  double score;
		private boolean gender;
		private Date birth;
		//@JSON(name="xingming")//改名字
		//@JSON(serialize=false)//去掉名字//必須放在get方法之上
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
		@JSON(serialize=false)
		public String getPass() {
			return pass;
		}
		public void setPass(String pass) {
			this.pass = pass;
		}
		public int getAge() {
			return age;
		}
		public void setAge(int age) {
			this.age = age;
		}
		public double getScore() {
			return score;
		}
		public void setScore(double score) {
			this.score = score;
		}
		public boolean isGender() {
			return gender;
		}
		public void setGender(boolean gender) {
			this.gender = gender;
		}
		@JSON(format="yyyy-MM-dd")
		public Date getBirth() {
			return birth;
		}
		public void setBirth(Date birth) {
			this.birth = birth;
		}
		
}

struts.xml

<?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>

	<package name="hello" namespace="/hello" extends="struts-default">
		<action name="login" class="action.LoginAction" >
		<result  name="success">
		   /index.jsp
		</result>
		</action>
	</package>
</struts>

index.jsp

<!-- 輸出從Action傳回json -->
<%=request.getSession().getAttribute("user").toString() %>

2.第二種方法傳回json

	// 第二種，返回jsp數據到客戶，外接插件或設備
	public void doAction() throws Exception {
		User user = new User();
		user.setName("csdn");
		user.setPass("pass");
		user.setAge(20);
		user.setScore(200d);
		user.setGender(true);

		// 聲明JSONObject對象
		JSONObject jo = new JSONObject();
		// 轉化User爲名字爲User的json格式,存放於JSONObject對象
		
		
		jo.put("name","csdnn");//附加數據{"name":"csdnn","user":{"age":20,"birth":null,"gender":true,"name":"csdn","pass":"pass","score":200}}
		
		jo.accumulate("user", user);
		// 得到response對象
		HttpServletResponse response = ServletActionContext.getResponse();
		// 設置格式
		response.setContentType("text/html");

		PrintWriter out = response.getWriter();
		// 輸出到客戶端
		out.write(jo.toString());
		out.flush();
		out.close();
	}

<package name="hello" namespace="/hello" extends="struts-default">
        <action name="doAction" class="action.LoginAction" method="doAction">
		
		</action>
	</package>

3.第三種方法傳回json

package action;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import net.sf.json.JSONObject;

import model.User;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {
	private HashMap<String, Object> dataMap = new HashMap<String, Object>();

	public HashMap<String, Object> getDataMap() {
		return dataMap;
	}

	public void setDataMap(HashMap<String, Object> dataMap) {
		this.dataMap = dataMap;
	}

	// 3.struts2方式返回json
	public String strsAction() {
		User user = new User();
		user.setName("csdn");
		user.setPass("pass");
		user.setAge(20);
		user.setScore(200d);
		user.setGender(true);
		user.setBirth(new Date());

		
		User user1 = new User();
		user1.setName("csdn");
		user1.setPass("pass");
		user1.setAge(20);
		user1.setScore(200d);
		user1.setGender(true);
		user.setBirth(new Date());


		List<User>  list=new ArrayList<User>();
		list.add(user);
		list.add(user1);
		/*
		 * // 聲明JSONObject對象 JSONObject jo = new JSONObject(); //
		 * 轉化User爲名字爲User的json格式,存放於JSONObject對象 jo.accumulate("user", user);
		 */
        //第二種傳遞集合的方法
		dataMap.put("user", user);
		
		dataMap.put("user1", user1);
		//第一種傳遞集合的方法.dataMap.put("user", list);
		return SUCCESS;
	}
}

struts.xml

<?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>
	<package name="json" extends="json-default">
	    <action class="action.LoginAction" name="json"  method="strsAction">
            <result  type="json">
                <param name="root">dataMap</param>
            </result>	       
	    </action>
	</package>
</struts>