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。

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

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：

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

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

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

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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