android端和Struts2服务器端通信，交互信息，参数采用JSON,使用了HttpClient与HttpPost类

首先是Struts端的程序，采用Struts2.1.6

1：web.xml的配置，主要是配置Struts2的filter

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1. <filter>  
2.     <filter-name>struts2</filter-name>  
3.     <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>  
4. </filter>  
5.   
6. <filter-mapping>  
7.     <filter-name>struts2</filter-name>  
8.     <url-pattern>/*</url-pattern>  
9. </filter-mapping>  

    <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>/*</url-pattern>    </filter-mapping>

2：struts.xml的内容：

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1. <package name="testjson" extends="json-default">  
2.         <action name="getjson" class="com.capinfotech.json.JSONAction" method="json">  
3.            <result type="json" />  
4.         </action>  
5.     </package>  

<package name="testjson" extends="json-default">        <action name="getjson" class="com.capinfotech.json.JSONAction" method="json">           <result type="json" />        </action>    </package>

 

3：JSONAciton的内容为：

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1. package com.capinfotech.json;  
2.   
3. import java.io.IOException;  
4. import java.util.HashMap;  
5. import java.util.Map;  
6.   
7. import javax.servlet.http.HttpServletRequest;  
8. import javax.servlet.http.HttpServletResponse;  
9.   
10. import net.sf.json.JSONArray;  
11. import net.sf.json.JSONObject;  
12.   
13. import org.apache.struts2.interceptor.ServletRequestAware;  
14. import org.apache.struts2.interceptor.ServletResponseAware;  
15.   
16. import com.opensymphony.xwork2.ActionSupport;  
17.   
18. public class JSONAction extends ActionSupport implements ServletRequestAware, ServletResponseAware{  
19.   
20.     private static final long serialVersionUID = -989477296829078690L;  
21.   
22.     private HttpServletRequest request;  
23.     private HttpServletResponse response;  
24.     private String format;  
25.       
26.     public String getFormat() {  
27.         return format;  
28.     }  
29.   
30.     public void setFormat(String format) {  
31.         this.format = format;  
32.     }  
33.   
34.     public void setServletRequest(HttpServletRequest request) {  
35.         this.request = request;  
36.     }  
37.   
38.     public void setServletResponse(HttpServletResponse response) {  
39.         this.response = response;     
40.     }  
41.   
42.     public void json() {  
43.                 JSONArray jsonArray = new JSONArray();  
44.                   
45.                 JSONObject jsonObject = new JSONObject();  
46.                 jsonObject.put("id", 1);  
47.                 jsonObject.put("title", "哈利波特");  
48.                 jsonObject.put("timelength", 89);  
49.                   
50.                 JSONObject jsonObject1 = new JSONObject();  
51.                 jsonObject1.put("id", 2);  
52.                 jsonObject1.put("title", "速度与激情");  
53.                 jsonObject1.put("timelength", 120);  
54.                   
55.                 JSONObject jsonObject2 = new JSONObject();  
56.                 jsonObject2.put("id", 3);  
57.                 jsonObject2.put("title", "变形金刚3");  
58.                 jsonObject2.put("timelength", 100);  
59.               
60.                 jsonArray.add(0, jsonObject);  
61.                 jsonArray.add(1, jsonObject1);  
62.                 jsonArray.add(2, jsonObject2);  
63.                   
64.                 try {  
65.                     this.response.setCharacterEncoding("UTF-8");  
66.                     this.response.getWriter().write(jsonArray.toString());  
67.                 } catch (IOException e) {  
68.                     e.printStackTrace();  
69.                 }  
70.         }  
71. }  

package com.capinfotech.json;import java.io.IOException;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import org.apache.struts2.interceptor.ServletRequestAware;import org.apache.struts2.interceptor.ServletResponseAware;import com.opensymphony.xwork2.ActionSupport;public class JSONAction extends ActionSupport implements ServletRequestAware, ServletResponseAware{private static final long serialVersionUID = -989477296829078690L;private HttpServletRequest request;private HttpServletResponse response;private String format;public String getFormat() {return format;}public void setFormat(String format) {this.format = format;}public void setServletRequest(HttpServletRequest request) {this.request = request;}public void setServletResponse(HttpServletResponse response) {    this.response = response;}public void json() {JSONArray jsonArray = new JSONArray();JSONObject jsonObject = new JSONObject();jsonObject.put("id", 1);jsonObject.put("title", "哈利波特");jsonObject.put("timelength", 89);JSONObject jsonObject1 = new JSONObject();jsonObject1.put("id", 2);jsonObject1.put("title", "速度与激情");jsonObject1.put("timelength", 120);JSONObject jsonObject2 = new JSONObject();jsonObject2.put("id", 3);jsonObject2.put("title", "变形金刚3");jsonObject2.put("timelength", 100);jsonArray.add(0, jsonObject);jsonArray.add(1, jsonObject1);jsonArray.add(2, jsonObject2);try {this.response.setCharacterEncoding("UTF-8");this.response.getWriter().write(jsonArray.toString());} catch (IOException e) {e.printStackTrace();}}}

4：运行效果为如下图：

5：运行注意事项，当Struts2中使用JSON时，一定要添加够JSON使用的包，否则会出错，要添加的包如下：

ezmorph-1.0.6.jar 
commons-lang 2.4 
commons-beanutils 1.7.0 
commons-collections 3.2 
commons-logging 1.1.1

Android端的程序和配置

1：androidmanifest.xml的内容为:

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"  
3.       package="cn.capinfotech.json"  
4.       android:versionCode="1"  
5.       android:versionName="1.0">  
6.     <application android:icon="@drawable/icon" android:label="@string/app_name">  
7.         <activity android:name=".MainActivity"  
8.                   android:label="@string/app_name">  
9.             <intent-filter>  
10.                 <action android:name="android.intent.action.MAIN" />  
11.                 <category android:name="android.intent.category.LAUNCHER" />  
12.             </intent-filter>  
13.         </activity>  
14.   
15.     </application>  
16.     <uses-sdk android:minSdkVersion="8" />  
17.     <uses-permission android:name="android.permission.INTERNET" />  
18.   
19. </manifest>   

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="cn.capinfotech.json"      android:versionCode="1"      android:versionName="1.0">    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".MainActivity"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>    <uses-sdk android:minSdkVersion="8" />    <uses-permission android:name="android.permission.INTERNET" /></manifest> 

2：main.xml的内容主要是定义了ListView用来显示最新的电影咨询

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     >  
7.   
8. <ListView   
9.     android:id="@+id/videos"  
10.     android:layout_width="fill_parent"   
11.     android:layout_height="fill_parent"   
12.    />  
13. </LinearLayout>  

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><ListView     android:id="@+id/videos"    android:layout_width="fill_parent"     android:layout_height="fill_parent"    /></LinearLayout>

3：item.xml的内容，主要用来定义ListView里每个元素的显示方式

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout  
3.   xmlns:android="http://schemas.android.com/apk/res/android"  
4.   android:layout_width="fill_parent"  
5.   android:layout_height="fill_parent">  
6. <TextView  
7.   android:layout_width="250dip"  
8.   android:layout_height="wrap_content"  
9.   android:id="@+id/title"   
10. />  
11.   
12. <TextView  
13.   android:layout_width="fill_parent"  
14.   android:layout_height="wrap_content"  
15.   android:id="@+id/timelength"  
16. />  
17.   
18. </LinearLayout>  

<?xml version="1.0" encoding="utf-8"?><LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"><TextView  android:layout_width="250dip"  android:layout_height="wrap_content"  android:id="@+id/title" /><TextView  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:id="@+id/timelength"/></LinearLayout>

4：定义了一个实体类Video

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1. package com.capinfotech.model;  
2.   
3. public class Video {  
4.       
5.     private Integer id;  
6.     private String name;  
7.     private Integer time;  
8.       
9.     public Video() {  
10.           
11.     }  
12.   
13.     public Video(Integer id, String name, Integer time) {  
14.         super();  
15.         this.id = id;  
16.         this.name = name;  
17.         this.time = time;  
18.     }  
19.   
20.     public Integer getId() {  
21.         return id;  
22.     }  
23.   
24.     public void setId(Integer id) {  
25.         this.id = id;  
26.     }  
27.   
28.     public String getName() {  
29.         return name;  
30.     }  
31.   
32.     public void setName(String name) {  
33.         this.name = name;  
34.     }  
35.   
36.     public Integer getTime() {  
37.         return time;  
38.     }  
39.   
40.     public void setTime(Integer time) {  
41.         this.time = time;  
42.     }  
43.   
44. }  

package com.capinfotech.model;public class Video {private Integer id;private String name;private Integer time;public Video() {}public Video(Integer id, String name, Integer time) {super();this.id = id;this.name = name;this.time = time;}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 Integer getTime() {return time;}public void setTime(Integer time) {this.time = time;}}

5：MainActivity的内容

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1. package cn.capinfotech.json;  
2.   
3. import java.net.URI;  
4. import java.util.ArrayList;  
5. import java.util.HashMap;  
6. import java.util.List;  
7.   
8. import org.apache.http.HttpEntity;  
9. import org.apache.http.HttpResponse;  
10. import org.apache.http.client.HttpClient;  
11. import org.apache.http.client.methods.HttpPost;  
12. import org.apache.http.impl.client.DefaultHttpClient;  
13. import org.apache.http.util.EntityUtils;  
14. import org.json.JSONArray;  
15. import org.json.JSONObject;  
16.   
17. import android.app.Activity;  
18. import android.os.Bundle;  
19. import android.util.Log;  
20. import android.widget.ListView;  
21. import android.widget.SimpleAdapter;  
22. import android.widget.Toast;  
23.   
24. public class MainActivity extends Activity {  
25.      private static final String TAG = "MainActivity";  
26.      private List<HashMap<String, Object>> videos = null;  
27.      private HashMap<String, Object> video = null;  
28.        
29.      private ListView listView = null;  
30.      private static String url = "http://10.0.2.2:8088/Struts2_sxt/getjson.action";    
31.        
32.     @Override  
33.     public void onCreate(Bundle savedInstanceState) {  
34.         super.onCreate(savedInstanceState);  
35.         setContentView(R.layout.main);  
36.           
37.         listView = (ListView)findViewById(R.id.videos);  
38.         getPDAServerData(url);  
39.           
40.     }  
41.    
42.     private void getPDAServerData(String url) {    
43.             HttpClient client = new DefaultHttpClient();    
44.             //提拱默认的HttpClient实现     
45.             HttpPost request;    
46.             try {    
47.                 request = new HttpPost(new URI(url));    
48.                 HttpResponse response = client.execute(request);    
49.                 // 判断请求是否成功     
50.                 if (response.getStatusLine().getStatusCode() == 200) { //200表示请求成功     
51.                     HttpEntity entity = response.getEntity();    
52.                     if (entity != null) {    
53.                         String out = EntityUtils.toString(entity, "UTF-8");    
54.                         Log.i(TAG, out);  
55.                           
56.                         JSONArray jsonArray = new JSONArray(out);  
57.                           
58.                         videos = new ArrayList<HashMap<String, Object>>();  
59.                         for(int i = 0; i<jsonArray.length(); i++) {  
60.                             JSONObject jsonObject = (JSONObject) jsonArray.get(i);  
61.                             int id = jsonObject.getInt("id");  
62.                             String name = jsonObject.getString("title");  
63.                             int timelength = jsonObject.getInt("timelength");  
64.                               
65.                             video = new HashMap<String, Object>();  
66.                             video.put("id", id);  
67.                             video.put("name", name);  
68.                             video.put("timelength", "时长为:" + timelength);  
69.                               
70.                             videos.add(video);  
71.                         }  
72.                           
73.                         SimpleAdapter adapter = new SimpleAdapter(this, videos, R.layout.item,   
74.                                                                new String[]{"name", "timelength"},  
75.                                                                new int[]{R.id.title, R.id.timelength}  
76.                                                  );  
77.                         listView.setAdapter(adapter);  
78.                           
79.                     }  
80.                 }  
81.             } catch(Exception e) {  
82.                 e.printStackTrace();  
83.                 Log.e(TAG, e.toString());  
84.                 Toast.makeText(MainActivity.this, "获取数据失败", Toast.LENGTH_LONG).show();  
85.             }  
86.     }  
87. }  

package cn.capinfotech.json;import java.net.URI;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import org.json.JSONArray;import org.json.JSONObject;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.Toast;public class MainActivity extends Activity {     private static final String TAG = "MainActivity";     private List<HashMap<String, Object>> videos = null;     private HashMap<String, Object> video = null;          private ListView listView = null; private static String url = "http://10.0.2.2:8088/Struts2_sxt/getjson.action";       @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                listView = (ListView)findViewById(R.id.videos);        getPDAServerData(url);            }     private void getPDAServerData(String url) {              HttpClient client = new DefaultHttpClient();              //提拱默认的HttpClient实现              HttpPost request;              try {                  request = new HttpPost(new URI(url));                  HttpResponse response = client.execute(request);                  // 判断请求是否成功                  if (response.getStatusLine().getStatusCode() == 200) { //200表示请求成功                      HttpEntity entity = response.getEntity();                      if (entity != null) {                          String out = EntityUtils.toString(entity, "UTF-8");                          Log.i(TAG, out);                                                JSONArray jsonArray = new JSONArray(out);                                                videos = new ArrayList<HashMap<String, Object>>();                        for(int i = 0; i<jsonArray.length(); i++) {                        JSONObject jsonObject = (JSONObject) jsonArray.get(i);                        int id = jsonObject.getInt("id");                        String name = jsonObject.getString("title");                        int timelength = jsonObject.getInt("timelength");                                                video = new HashMap<String, Object>();                        video.put("id", id);                        video.put("name", name);                        video.put("timelength", "时长为:" + timelength);                                                videos.add(video);                        }                                                SimpleAdapter adapter = new SimpleAdapter(this, videos, R.layout.item,                                                        new String[]{"name", "timelength"},                                                       new int[]{R.id.title, R.id.timelength}                                         );                        listView.setAdapter(adapter);                                            }                }            } catch(Exception e) {            e.printStackTrace();            Log.e(TAG, e.toString());            Toast.makeText(MainActivity.this, "获取数据失败", Toast.LENGTH_LONG).show();            }    }}

6：程序界面效果图