android客户端访问服务器端

package com.android.tools;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;

/**
 * 网络访问工具
 * 
 * @author Administrator
 * 
 */
public class HttpUtil {

    /**
     * 创建get请求对象
     * 
     * @param url
     * @return
     */
    public static HttpGet getHttpGet(String url) {
        HttpGet request = new HttpGet(url);
        return request;
    }

    /**
     * 创建post请求对象
     * 
     * @param url
     * @return
     */
    public static HttpPost getHttpPost(String url) {
        HttpPost request = new HttpPost(url);
        return request;
    }

    /**
     * 根据请求获得响应对象
     * 
     * @return
     * @throws IOException
     * @throws ClientProtocolException
     */
    public static HttpResponse getHttpResponse(HttpGet request)
            throws ClientProtocolException, IOException {
        HttpResponse response = new DefaultHttpClient().execute(request);
        return response;
    }

    /**
     * 根据请求获得响应对象
     * 
     * @param request
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public static HttpResponse getHttpResponse(HttpPost request)
            throws ClientProtocolException, IOException {
        HttpResponse response = new DefaultHttpClient().execute(request);
        return response;
    }

    /**
     * 发送Post请求，获取响应结果
     * 
     * @param url
     * @return
     * @throws IOException
     * @throws ClientProtocolException
     */
    public static String queryStringForPost(String url)
            throws ClientProtocolException, IOException {
        // 根据URL获取POST对象
        HttpPost request = getHttpPost(url);
        String result = null;

        try {
            // 获得响应对象
            HttpResponse response = getHttpResponse(request);
            // 判断是否请求成功
            if (response.getStatusLine().getStatusCode() == 200) {
                // 获得响应
                result = "获得数据";
                return result;
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
            result = "网络异常！";
            return result;
        } catch (IOException e) {
            e.printStackTrace();
            result = "网络异常！";
            return result;
        }

        return null;
    }

    /**
     * 发送GET请求，获取响应结果
     * 
     * @param url
     * @return
     * @throws IOException
     * @throws ClientProtocolException
     */
    public static String queryStringForGet(String url) {
        // 根据URL获取POST对象
        HttpGet request = getHttpGet(url);
        String result = null;

        try {
            // 获得响应对象
            HttpResponse response = getHttpResponse(request);
            // 判断是否请求成功
            if (response.getStatusLine().getStatusCode() == 200) {
                // 获得响应
                result = "success";
                return result;
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
            result = "网络异常！";
            return result;
        } catch (IOException e) {
            e.printStackTrace();
            result = "网络异常！";
            return result;
        }

        return null;
    }

    
    public static String getContent(String url) throws IOException{
        StringBuilder sb = new StringBuilder();        
        HttpClient client = new DefaultHttpClient();
        HttpParams httpParams = client.getParams();
        
        //设置网络连接参数及超时时间为5秒
        HttpConnectionParams.setConnectionTimeout(httpParams, 5000);
        
        try {
            HttpResponse response = client.execute(new HttpGet(url));
            HttpEntity entity = response.getEntity();
            if(entity != null){
                BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(),"utf8"),8192);
                String line = null;
                while((line = reader.readLine())!=null){
                    sb.append(line + "\n");
                }
                reader.close();
            }
        }
        catch(ClientProtocolException e){
            e.printStackTrace();
        }
        catch(IOException e){
            e.printStackTrace();
        }
        return sb.toString();
    }
}