Android实战简易教程-第六十六枪（server端搭建和server端Json数据交互）

学习Android有一段时间了。对server端有非常深的好奇，决定对server端的实现进行一些研究，这里实现了一个简单的小样例，用于获取server端的json数据，样例非常easy，适合刚開始学习的人学习使用。

server端

首先我们搭建server端，server端使用struct2架构，对该架构不熟悉的人能够花一点时间看看慕课网上的相关视频，这里用myeclipse实现server端。

新建一个webproject。这里要引入struct2相关，方法是：点击新建的webproject邮件-》myeclipse选项-》project facets->选择安装struct2相关就可以。

看一下相关代码：

struts.xml:

<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">  

    <struts>
        <package name="struts2" extends="struts-default" namespace="/">
    <action name="getjson" class="com.shao.action.JSONAction" method="json">
     <result  name="success">index.jsp</result>
    </action>
        </package>
    </struts>  

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>Test2</display-name>
  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>*.action</url-pattern>
  </filter-mapping>
</web-app>

以下是JSONAction.java:

package com.shao.action;  

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;  

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;  

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;  

import com.google.gson.Gson;
import com.opensymphony.xwork2.ActionSupport;
import com.shao.domain.Music;  

public class JSONAction extends ActionSupport implements ServletRequestAware,
        ServletResponseAware {  

    /**
     *
     */
    private static final long serialVersionUID = -3604892179657815531L;
    private  HttpServletRequest request;
    private  HttpServletResponse  response;
    private  String  format;
    public String getFormat() {
        return format;
    }  

    public void setFormat(String format) {
        this.format = format;
    }  

    @Override
    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
    }  

    @Override
    public void setServletResponse(HttpServletResponse response) {
        this.response = response;
    }  

    public  void json(){
        List<Music> list = new ArrayList<Music>();
        Gson gson = new  Gson();
        Music m1 = new Music();
        m1.setId(1);
        m1.setAuthor("周杰伦");
        m1.setName("外婆");
        m1.setTime("04:04");
        list.add(m1);
        Music m2 = new Music();
        m2.setId(2);
        m2.setAuthor("周杰伦");
        m2.setName("半兽人");
        m2.setTime("04:05");
        list.add(m2);
        Music m3 = new Music();
        m3.setId(3);
        m3.setAuthor("周杰伦");
        m3.setName("乌克丽丽");
        m3.setTime("02:55");
        list.add(m3);
        java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<List<Music>>() {
        }.getType();  //指定type
        String beanListToJson = gson.toJson(list,type);  //list转换成json字符串
        System.out.println("GSON-->"+beanListToJson);
        try {
             response.setCharacterEncoding("UTF-8");
            this.response.getWriter().write(beanListToJson);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}  

最后是Music类：（这个类在Android程序中也须要）

package com.shao.domain;  

public class Music {  

        private Integer id;
        private String name;
        private String time;
        private String  author;
        public Integer getId() {
            return id;
        }
        public void setId(Integer id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public String getTime() {
            return time;
        }
        public void setTime(String time) {
            this.time = time;
        }
        public String getAuthor() {
            return author;
        }
        public void setAuthor(String author) {
            this.author = author;
        }
} 

好了，以下选择project右键：run as->myeclipse server application:

 

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注意，本项目的端口选择的是8888，yayun表示本机。

这时在浏览器地址栏输入：http://yayun:8888/Test2/getjson.action

出现例如以下 ：

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说明server端搭建成功。

另外，本系统json解析用到了Gson的jar包，要自己导入哦，下载Gson引入到项目中，Android端也须要这个jar包。

移动端

移动端用eclipse实现

首先是JsonClientActivity:

package com.test.demo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.example.testandroid.R;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class JsonClientActivity extends Activity {
	private Button update;
	private ListView listView;
	private String jsonResult;
	private Handler handler=new Handler(){
		public void handleMessage(android.os.Message msg) {
			jsonResult=(String) msg.obj;
		};
	};

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		update = (Button) findViewById(R.id.update);
		listView = (ListView) findViewById(R.id.list);
		update.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				String urlStr = "http://192.168.0.103:8888/Test2/getjson.action";

				getJson(urlStr);
				String jString=jsonResult;
				List<Music> list = GsonUtil.getListFromJson(jString);
				System.out.println(list);
				if (list != null) {
					System.out.println(list);
					List<Map<String, Object>> data = getAdapterData(list);

					SimpleAdapter adapter = new SimpleAdapter(JsonClientActivity.this, data, R.layout.list,
							new String[] { "name", "author", "time" }, new int[] { R.id.name, R.id.author, R.id.time });
					listView.setAdapter(adapter);
				}

			}
		});
	}

	private List<Map<String, Object>> getAdapterData(List list) {
		List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
		for (int i = 0; i < list.size(); i++) {
			Map<String, Object> map = new HashMap<String, Object>();
			Music music = (Music) list.get(i);
			map.put("name", music.getName());
			map.put("author", music.getAuthor());
			map.put("time", music.getTime());
			data.add(map);
		}
		return data;
	}
	/**
	 * 异步获取json字符串
	 * @param url
	 */

    public   void getJson(final String  url){  

 	   new Thread(new Runnable() {

			@Override
			public void run() {
				  URL urlString;
				try {
					urlString = new URL(url);
					HttpURLConnection httpURLConnection=(HttpURLConnection) urlString.openConnection();
					httpURLConnection.setConnectTimeout(5000);
					httpURLConnection.setDoInput(true);
					httpURLConnection.setRequestMethod("GET");
					httpURLConnection.connect();

					InputStream inputStream=httpURLConnection.getInputStream();
					InputStreamReader inputStreamReader=new InputStreamReader(inputStream);

					BufferedReader bufferedReader=new BufferedReader(inputStreamReader);
					StringBuilder stringBuilder=new StringBuilder();
					String line;
					while ((line=bufferedReader.readLine())!=null) {
						stringBuilder.append(line);
					}
					System.out.println(new String());
					Message message=new Message();
					message.obj=new String(stringBuilder.toString());
					handler.sendMessage(message);

				} catch (MalformedURLException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}

			}
		}).start();

    }
}

然后是工具类：

package com.test.demo;  

import java.util.List;

import com.google.gson.Gson;  

public class GsonUtil {  

   public  static  List<Music>  getListFromJson(String json){
        java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<List<Music>>() {
        }.getType();
        Gson gson = new Gson();
        List<Music>  list  = gson.fromJson(json, type);
        return list;
   }
} 

布局类非常easy就不写了。能够自行下载源代码。执行Android程序：

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执行不成功的注意网络权限。

源代码下载：

server端

Android端

 

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