Android发送GET和POST以及HttpClient发送POST请求给服务器响应

jopen 6年前

效果如下图所示:

Android发送GET和POST以及HttpClient发送POST请求给服务器响应

 

布局main.xml

<?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

<?xml version="1.0" encoding="utf-8"?>  <resources>      <string name="hello">Hello World, MainActivity!</string>      <string name="app_name">资讯管理</string>      <string name="title">标题</string>      <string name="timelength">时长</string>      <string name="button">保存</string>      <string name="success">保存成功</string>      <string name="fail">保存失败</string>      <string name="error">服务器响应错误</string>  </resources>

 

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);  //发送GET请求  //   result = NewsService.save(path, title, length, NewsService.POST); //发送POST请求     result = NewsService.save(path, title, length, NewsService.HttpClientPost); //通过HttpClient框架发送POST请求     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();    }     }    }



 

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;     /**    * 保存数据    *     * @param title    *            标题    * @param length    *            时长    * @param flag    *            true则使用POST请求 false使用GET请求    * @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;   }     /**    * 通过HttpClient框架发送POST请求    * HttpClient该框架已经集成在android开发包中    * 个人认为此框架封装了很多的工具类,性能比不上自己手写的下面两个方法    * 但是该方法可以提高程序员的开发速度,降低开发难度    * @param path    *            请求路径    * @param params    *            请求参数    * @param encoding    *            编码    * @return 请求是否成功    * @throws Exception    */   private static boolean sendHttpClientPOSTRequest(String path,     Map<String, String> params, String encoding) throws Exception {    List<NameValuePair> pairs = new ArrayList<NameValuePair>();// 存放请求参数    if (params != null && !params.isEmpty()) {     for (Map.Entry<String, String> entry : params.entrySet()) {      //BasicNameValuePair实现了NameValuePair接口      pairs.add(new BasicNameValuePair(entry.getKey(), entry        .getValue()));     }    }    UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs, encoding); //pairs:请求参数   encoding:编码方式    HttpPost httpPost = new HttpPost(path); //path:请求路径    httpPost.setEntity(entity);         DefaultHttpClient client = new DefaultHttpClient(); //相当于浏览器    HttpResponse response = client.execute(httpPost);  //相当于执行POST请求    //取得状态行中的状态码    if (response.getStatusLine().getStatusCode() == 200) {     return true;    }    return false;   }     /**    * 发送POST请求    *     * @param path    *            请求路径    * @param params    *            请求参数    * @param encoding    *            编码    * @return 请求是否成功    * @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));// 编码      data.append('&');     }     data.deleteCharAt(data.length() - 1);    }    byte[] entity = data.toString().getBytes(); // 得到实体数据    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);// 允许对外输出数据    OutputStream outputStream = connection.getOutputStream();    outputStream.write(entity);      if (connection.getResponseCode() == 200) {     return true;    }    return false;   }     /**    * 发送GET请求    *     * @param path    *            请求路径    * @param params    *            请求参数    * @param encoding    *            编码    * @return 请求是否成功    * @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));// 编码     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;   }  }


 在服务器上写一个ManageServlet用来处理POST和GET请求

 

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("视频名称:" + title);    System.out.println("视频时长:" + timelength);   }     public void doPost(HttpServletRequest request, HttpServletResponse response)     throws ServletException, IOException {    doGet(request, response);   }  }


为了处理编码问题 写了过滤器

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("过滤完成");   }     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("开始过滤");   }    }

package cn.roco.filter;    import java.io.UnsupportedEncodingException;    import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletRequestWrapper;  /**   * 包装 HttpServletRequest对象   */  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;   }    }