Android發送GET和POST以及HttpClient發送POST請求給服務器響應



效果如下圖所示：

 

佈局main.xml

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<?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"     >     <TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/title"     />     <EditText      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:id="@+id/title"     />           <TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:numeric="integer"     android:text="@string/timelength"     />     <EditText      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:id="@+id/timelength"     />     <Button android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/button"     android:onClick="save"     android:id="@+id/button"/> </LinearLayout>

 

string.xml

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<?xml version="1.0" encoding="utf-8"?> <resources>     <string name="hello">Hello World, MainActivity!</string>     <string name="app_name">資訊管理</string>     <string name="title">標題</string>     <string name="timelength">時長</string>     <string name="button">保存</string>     <string name="success">保存成功</string>     <string name="fail">保存失敗</string>     <string name="error">服務器響應錯誤</string> </resources>

 

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package cn.roco.manage;   import cn.roco.manage.service.NewsService; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.Toast;   public class MainActivity extends Activity {       private EditText titleText;     private EditText lengthText;       /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         titleText = (EditText) this.findViewById(R.id.title);         lengthText = (EditText) this.findViewById(R.id.timelength);     }       public void save(View v) {         String title = titleText.getText().toString();         String length = lengthText.getText().toString();         String path = "http://192.168.1.100:8080/Hello/ManageServlet";         boolean result;         try { //          result = NewsService.save(path, title, length, NewsService.GET);  //發送GET請求 //          result = NewsService.save(path, title, length, NewsService.POST); //發送POST請求             result = NewsService.save(path, title, length, NewsService.HttpClientPost); //通過HttpClient框架發送POST請求             if (result) {                 Toast.makeText(getApplicationContext(), R.string.success, 1)                         .show();             } else {                 Toast.makeText(getApplicationContext(), R.string.fail, 1)                         .show();             }         } catch (Exception e) {             Toast.makeText(getApplicationContext(), e.getMessage(), 1).show();             Toast.makeText(getApplicationContext(), R.string.error, 1).show();         }       }   }

 

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package cn.roco.manage.service;   import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLEncoder; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;   import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair;   public class NewsService {       public static final int POST = 1;     public static final int GET = 2;     public static final int HttpClientPost = 3;       /**      * 保存數據      *      * @param title      *            標題      * @param length      *            時長      * @param flag      *            true則使用POST請求 false使用GET請求      * @return 是否保存成功      * @throws Exception      */     public static boolean save(String path, String title, String timelength,             int flag) throws Exception {         Map<String, String> params = new HashMap<String, String>();         params.put("title", title);         params.put("timelength", timelength);         switch (flag) {         case POST:             return sendPOSTRequest(path, params, "UTF-8");         case GET:             return sendGETRequest(path, params, "UTF-8");         case HttpClientPost:             return sendHttpClientPOSTRequest(path, params, "UTF-8");         }         return false;     }       /**      * 通過HttpClient框架發送POST請求      * HttpClient該框架已經集成在android開發包中      * 個人認爲此框架封裝了很多的工具類，性能比不上自己手寫的下面兩個方法      * 但是該方法可以提高程序員的開發速度，降低開發難度      * @param path      *            請求路徑      * @param params      *            請求參數      * @param encoding      *            編碼      * @return 請求是否成功      * @throws Exception      */     private static boolean sendHttpClientPOSTRequest(String path,             Map<String, String> params, String encoding) throws Exception {         List<NameValuePair> pairs = new ArrayList<NameValuePair>();// 存放請求參數         if (params != null && !params.isEmpty()) {             for (Map.Entry<String, String> entry : params.entrySet()) {                 //BasicNameValuePair實現了NameValuePair接口                 pairs.add(new BasicNameValuePair(entry.getKey(), entry                         .getValue()));             }         }         UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs, encoding);    //pairs:請求參數   encoding:編碼方式         HttpPost httpPost = new HttpPost(path); //path:請求路徑         httpPost.setEntity(entity);                   DefaultHttpClient client = new DefaultHttpClient(); //相當於瀏覽器         HttpResponse response = client.execute(httpPost);  //相當於執行POST請求         //取得狀態行中的狀態碼         if (response.getStatusLine().getStatusCode() == 200) {             return true;         }         return false;     }       /**      * 發送POST請求      *      * @param path      *            請求路徑      * @param params      *            請求參數      * @param encoding      *            編碼      * @return 請求是否成功      * @throws Exception      */     private static boolean sendPOSTRequest(String path,             Map<String, String> params, String encoding) throws Exception {         StringBuilder data = new StringBuilder();         if (params != null && !params.isEmpty()) {             for (Map.Entry<String, String> entry : params.entrySet()) {                 data.append(entry.getKey()).append("=");                 data.append(URLEncoder.encode(entry.getValue(), encoding));// 編碼                 data.append('&');             }             data.deleteCharAt(data.length() - 1);         }         byte[] entity = data.toString().getBytes(); // 得到實體數據         HttpURLConnection connection = (HttpURLConnection) new URL(path)                 .openConnection();         connection.setConnectTimeout(5000);         connection.setRequestMethod("POST");         connection.setRequestProperty("Content-Type",                 "application/x-www-form-urlencoded");         connection.setRequestProperty("Content-Length",                 String.valueOf(entity.length));           connection.setDoOutput(true);// 允許對外輸出數據         OutputStream outputStream = connection.getOutputStream();         outputStream.write(entity);           if (connection.getResponseCode() == 200) {             return true;         }         return false;     }       /**      * 發送GET請求      *      * @param path      *            請求路徑      * @param params      *            請求參數      * @param encoding      *            編碼      * @return 請求是否成功      * @throws Exception      */     private static boolean sendGETRequest(String path,             Map<String, String> params, String encoding) throws Exception {         StringBuilder url = new StringBuilder(path);         url.append("?");         for (Map.Entry<String, String> entry : params.entrySet()) {             url.append(entry.getKey()).append("=");             url.append(URLEncoder.encode(entry.getValue(), encoding));// 編碼             url.append('&');         }         url.deleteCharAt(url.length() - 1);         HttpURLConnection connection = (HttpURLConnection) new URL(                 url.toString()).openConnection();         connection.setConnectTimeout(5000);         connection.setRequestMethod("GET");         if (connection.getResponseCode() == 200) {             return true;         }         return false;     } }

 在服務器上寫一個ManageServlet用來處理POST和GET請求

 

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package cn.roco.servlet;   import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;   public class ManageServlet extends HttpServlet {       public void doGet(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {         request.setCharacterEncoding("UTF-8");         String title = request.getParameter("title");         String timelength = request.getParameter("timelength");         System.out.println("視頻名稱：" + title);         System.out.println("視頻時長：" + timelength);     }       public void doPost(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {         doGet(request, response);     } }

爲了處理編碼問題 寫了過濾器

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package cn.roco.filter;   import java.io.IOException;   import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest;   public class EncodingFilter implements Filter {       public void destroy() {         System.out.println("過濾完成");     }       public void doFilter(ServletRequest req, ServletResponse resp,             FilterChain chain) throws IOException, ServletException {         HttpServletRequest request = (HttpServletRequest) req;         if ("GET".equals(request.getMethod())) {             EncodingHttpServletRequest wrapper=new EncodingHttpServletRequest(request);             chain.doFilter(wrapper, resp);         }else{             req.setCharacterEncoding("UTF-8");             chain.doFilter(req, resp);         }     }       public void init(FilterConfig fConfig) throws ServletException {         System.out.println("開始過濾");     }   }

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package cn.roco.filter;   import java.io.UnsupportedEncodingException;   import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletRequestWrapper; /**  * 包裝 HttpServletRequest對象  */ public class EncodingHttpServletRequest extends HttpServletRequestWrapper {     private HttpServletRequest request;       public EncodingHttpServletRequest(HttpServletRequest request) {         super(request);         this.request = request;     }       @Override     public String getParameter(String name) {         String value = request.getParameter(name);         if (value != null && !("".equals(value))) {             try {                 value=new String(value.getBytes("ISO8859-1"),"UTF-8");             } catch (UnsupportedEncodingException e) {                 e.printStackTrace();             }         }         return value;     }   } 轉自：http://www.open-open.com/lib/view/open1365989462093.html