DefaultHttpClient使用

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1 httpClient封装后使用，get和post方法

package util;    import java.io.BufferedReader;  import java.io.InputStream;  import java.io.InputStreamReader;  import java.util.ArrayList;  import java.util.Iterator;  import java.util.List;  import java.util.Map;    import net.sf.json.JSONObject;    import org.apache.http.HttpEntity;  import org.apache.http.HttpResponse;  import org.apache.http.NameValuePair;  import org.apache.http.client.HttpClient;  import org.apache.http.client.entity.UrlEncodedFormEntity;  import org.apache.http.client.methods.HttpPost;  import org.apache.http.entity.StringEntity;  import org.apache.http.impl.client.DefaultHttpClient;  import org.apache.http.message.BasicNameValuePair;  import org.apache.http.protocol.HTTP;    /**  * @Title:TestHttpClient  * @Author Tony  * @Date: 2014年6月21日 下午3:29:37  * @Description:  httpClient使用，1 发送post请求   2 发送get请求   *   */  public class TestHttpClient {           /**     * @Title: methodPost      * @Description: httpclient方法中post提交数据的使用      * @param @return     * @param @throws Exception        * @return String         * @throws      */      public static String methodPost() throws Exception {          DefaultHttpClient httpclient = new DefaultHttpClient();          // // 代理的设置          // HttpHost proxy = new HttpHost("10.60.8.20", 8080);          // httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,          // proxy);            // 目标地址          HttpPost httppost = new HttpPost(                  "http://localhost:8011/testServlet");          System.out.println("请求: " + httppost.getRequestLine());             // post 参数 传递          List<BasicNameValuePair> nvps = new ArrayList<BasicNameValuePair>();          nvps.add(new BasicNameValuePair("content", "11111111")); // 参数          nvps.add(new BasicNameValuePair("path", "D:/file")); // 参数          nvps.add(new BasicNameValuePair("name", "8")); // 参数          nvps.add(new BasicNameValuePair("age", "9")); // 参数          nvps.add(new BasicNameValuePair("username", "wzt")); // 参数            httppost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8)); // 设置参数给Post            // 执行          HttpResponse response = httpclient.execute(httppost);          HttpEntity entity = response.getEntity();          System.out.println(response.getStatusLine());          if (entity != null) {              System.out.println("Response content length: "                      + entity.getContentLength());          }          // 显示结果          BufferedReader reader = new BufferedReader(new InputStreamReader(                  entity.getContent(), "UTF-8"));            String line = null;          while ((line = reader.readLine()) != null) {              System.out.println(line);          }          if (entity != null) {              entity.consumeContent();          }          return null;        }            /**     * @Title: methodGet      * @Description:  以get方法提交数的使用      * @param @return     * @param @throws Exception        * @return String         * @throws      */      public static  String methodGet() throws  Exception {              DefaultHttpClient httpclient = new DefaultHttpClient();     //               // 代理的设置     //                HttpHost proxy = new HttpHost("10.60.8.20", 8080);     //                httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);                     // 目标地址                  HttpPost httpGet = new HttpPost("http://localhost:8011/testServlet");                                 // 构造最简单的字符串数据                   StringEntity reqEntity = new StringEntity("name=test&password=test");                  // 设置类型                   reqEntity.setContentType("application/x-www-form-urlencoded");                  // 设置请求的数据                   httpGet.setEntity(reqEntity);                              // 执行                  HttpResponse response = httpclient.execute(httpGet);                  HttpEntity entity = response.getEntity();                  System.out.println(response.getStatusLine());                                if (entity != null) {                    System.out.println("Response content length: " + entity.getContentLength());  //得到返回数据的长度                 }                  // 显示结果                  BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));                               String line = null;                 while ((line = reader.readLine()) != null) {                      System.out.println(line);                  }                 if (entity != null) {                       entity.consumeContent();                  }                 return null;             }             /**      * 模拟url访问 从特定的url中获取json      *       * @param urlStr      * @param params      * @return json object ,or null if failed      * 参数经过封装后传过来 ，提交为 post请求      */      private static JSONObject getJsonFromUrl(String urlStr,              Map<String, String> params) {          HttpClient httpClient = new DefaultHttpClient();          HttpPost httpPost = new HttpPost(urlStr);          JSONObject json = null;          try {              if (params != null) {                  Iterator<String> keys = params.keySet().iterator();                  List<NameValuePair> nvps = new ArrayList<NameValuePair>();                  while (keys.hasNext()) {                      String key = keys.next();                      nvps.add(new BasicNameValuePair(key, params.get(key)));                  }                  httpPost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));              }              HttpResponse response = httpClient.execute(httpPost);              HttpEntity entity = response.getEntity();              InputStream is = entity.getContent();              byte[] bytes = new byte[256];              StringBuffer sb = new StringBuffer();              while (is.read(bytes) > 0) {                  sb.append(new String(bytes));                  bytes = new byte[256];              }              json = JSONObject.fromObject(sb.toString());          } catch (Exception e) {               e.printStackTrace();          }            return json;      }            /**     * @Title: main      * @Description: 测试类      * @param @param args        * @return void         * @throws      */      public static void main(String[] args) {          try {              TestHttpClient.methodGet();  //          TestHttpClient.methodPost();                        } catch (Exception e) {              // TODO Auto-generated catch block              e.printStackTrace();          }      }  }

2.后台接受数据的servlet

public class TestServlet extends HttpServlet {      private static final long serialVersionUID = 1L;                     /**      * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)      */      protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {          request.setCharacterEncoding( "utf-8");          response.setContentType("text/html;charset=utf-8");          response.setCharacterEncoding("utf-8");                    String name = request.getParameter("name");          System.out.println("name 变量数据： "+name);      }  }

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