Android實戰簡易教程-第六十六槍（伺服器端搭建和伺服器端Json資料互動）

Android實戰簡易教程-第六十六槍（伺服器端搭建和伺服器端Json資料互動）

學習Android有一段時間了，對伺服器端有很深的好奇，決定對伺服器端的實現進行一些研究，這裡實現了一個簡單的小例子，用於擷取伺服器端的json資料，例子很簡單，適合初學者學習使用。

伺服器端

首先我們搭建伺服器端，伺服器端使用struct2架構，對該架構不熟悉的人可以花一點時間看看慕課網上的相關視頻，這裡用myeclipse實現伺服器端。

建立一個web工程，這裡要引入struct2相關，方法是：點擊建立的web工程郵件-》myeclipse選項-》project facets->選擇安裝struct2相關即可。

看一下相關代碼：

struts.xml:

                               index.jsp                        

web.xml:

  Test2      struts2    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter        struts2    *.action  

下面是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 list = new ArrayList();          Gson gson = new  Gson();          Music m1 = new Music();          m1.setId(1);          m1.setAuthor("周杰倫");          m1.setName("外婆");          m1.setTime("04:04");          list.add(m1);          Music m2 = new Music();          m2.setId(2);          m2.setAuthor("周杰倫");          m2.setName("半獸人");          m2.setTime("04:05");          list.add(m2);          Music m3 = new Music();          m3.setId(3);          m3.setAuthor("周杰倫");          m3.setName("烏克麗麗");          m3.setTime("02:55");          list.add(m3);          java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken>() {          }.getType();  //指定type        String beanListToJson = gson.toJson(list,type);  //list轉換成json字串        System.out.println("GSON-->"+beanListToJson);             try {                 response.setCharacterEncoding("UTF-8");               this.response.getWriter().write(beanListToJson);            } catch (IOException e) {                e.printStackTrace();            }        }  }  

最後是Music類：（這個類在Android程式中也需要）

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，下面選擇工程右鍵：run as->myeclipse server application:

 

注意，本項目的連接埠選擇的是8888，yayun表示本機。

這時在瀏覽器地址欄輸入：http://yayun:8888/Test2/getjson.action

出現如下 ：

說明伺服器端搭建成功。另外，本系統json解析用到了Gson的jar包，要自己匯入哦，下載Gson引入到項目中，Android端也需要這個jar包。

移動端

移動端用eclipse實現

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;};};@Overridepublic 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() {@Overridepublic void onClick(View v) {String urlStr = "http://192.168.0.103:8888/Test2/getjson.action";getJson(urlStr);String jString=jsonResult;List list = GsonUtil.getListFromJson(jString);System.out.println(list);if (list != null) {System.out.println(list);List> 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> getAdapterData(List list) {List> data = new ArrayList>();for (int i = 0; i < list.size(); i++) {Map map = new HashMap();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;}/** * 非同步擷取json字串 * @param url */    public   void getJson(final String  url){          new Thread(new Runnable() {@Overridepublic 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();              } }

然後是工具類：

package com.test.demo;    import java.util.List;import com.google.gson.Gson;    public class GsonUtil {      public  static  List  getListFromJson(String json){          java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken>() {          }.getType();          Gson gson = new Gson();          List  list  = gson.fromJson(json, type);          return list;     }  } 

布局類很簡單就不寫了，可以自行下載源碼。運行Android程式：

運行不成功的注意網路許可權。