Android客户端post请求服务器端实例

package com.scd.jsondemo.util;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
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;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;

public class JsonUtil {
  /** 地址 */
  private static final String INNER_URL = "http://localhost:8080/index2.jsp";
  /** TAG */
  private final String TAG = getClass().getSimpleName();
  private static final int USER_ID = 1;

  /***
   * 客户端调用的方法：传递参数向服务器中发送请求
   * 
   * @param userId
   * @param userName
   * @return
   */
  public static JSONObject getData(String userId, String userName) {
    int modelId = USER_ID;
    List<NameValuePair> list = new ArrayList<NameValuePair>();
    list.add(new BasicNameValuePair("userId", userId));
    list.add(new BasicNameValuePair("userName", userName));

    return doPost(modelId, list);
  }

  /**
   * 请求服务器的方法
   * 
   * @param model
   * @param paramList
   * @return
   */
  private static JSONObject doPost(int model, List<NameValuePair> paramList) {

    // 1.创建请求对象
    HttpPost httpPost = new HttpPost(INNER_URL);
    // post请求方式数据放在实体类中
    HttpEntity entity = null;
    try {
      entity = new UrlEncodedFormEntity(paramList, HTTP.UTF_8);
      httpPost.setEntity(entity);
    } catch (UnsupportedEncodingException e1) {
      e1.printStackTrace();
    }

    // 2.创建客户端对象
    HttpClient httpClient = new DefaultHttpClient();
    // 3.客户端带着请求对象请求服务器端
    try {
      // 服务器端返回请求的数据
      HttpResponse httpResponse = httpClient.execute(httpPost);
      // 解析请求返回的数据
      if (httpResponse != null
          && httpResponse.getStatusLine().getStatusCode() == 200) {
        String element = EntityUtils.toString(httpResponse.getEntity(),
            HTTP.UTF_8);
        if (element.startsWith("{")) {
          try {
            return new JSONObject(element);
          } catch (JSONException e) {
            e.printStackTrace();
          }
        }
      }

    } catch (ClientProtocolException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }

    return null;

  }

}