简单的POST请求和get请求

package com.dp.util;import java.util.ArrayList;import java.util.List;import java.util.Map;import java.util.Map.Entry;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.NameValuePair;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;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.message.BasicNameValuePair;import org.apache.http.params.CoreConnectionPNames;import org.apache.http.params.HttpConnectionParams;import org.apache.http.protocol.HTTP;import org.apache.http.util.EntityUtils;import com.android.volley.DefaultRetryPolicy;import com.android.volley.Request.Method;import com.android.volley.Response.ErrorListener;import com.android.volley.Response.Listener;import com.android.volley.toolbox.StringRequest;public class HttpClientUtils {    /**     * 自己实现HTTP请求 HttpClient POST请求      */    public static String post(String url, Map<String, String> params) {        try {            List<NameValuePair> postParams = new ArrayList<NameValuePair>();            StringBuffer auth = new  StringBuffer();            StringBuffer token = new StringBuffer();            for (Entry<String, String> entry : params.entrySet()) {                if ("".equals(auth.toString())) {                    auth.append(entry.getKey());                } else {                    auth.append("," + entry.getKey());                }                token.append(entry.getValue());                postParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));            }            // 创建POST请求            HttpPost request = new HttpPost(url);            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(postParams,HTTP.UTF_8);            request.setEntity(entity);            HttpClient client = new DefaultHttpClient();            client.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 15000);            client.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 15000);            HttpResponse response = client.execute(request);            if(response.getStatusLine().getStatusCode()!=HttpStatus.SC_OK){                throw new RuntimeException("请求失败");            }            HttpEntity resEntity =  response.getEntity();            return (resEntity == null) ? null : EntityUtils.toString(resEntity, HTTP.UTF_8);        } catch (Exception e) {            return null;        }    }    /**     * 自己实现的Http请求    HttpClient  get请求     */    public static String get(String url){        HttpGet httpGet = new HttpGet(url);        //设置连接超时或响应超时        HttpConnectionParams.setConnectionTimeout(httpGet.getParams(), 15000);          HttpConnectionParams.setSoTimeout(httpGet.getParams(), 15000);          //创建一个网络访问处理对象        HttpClient httpClient = new DefaultHttpClient();        try{            HttpResponse response = httpClient.execute(httpGet); //发起GET请求             if(response.getStatusLine().getStatusCode()!=HttpStatus.SC_OK){                throw new RuntimeException("请求失败");            }            HttpEntity resEntity =  response.getEntity();            return (resEntity == null) ? null : EntityUtils.toString(resEntity, HTTP.UTF_8);        }catch(Exception e){            return null;        }finally{            //释放网络连接资源              httpClient.getConnectionManager().shutdown();          }    }}