java发送HttpClient请求及接收请求结果过程的简单实例

一.

1、写一个HttpRequestUtils工具类，包括post请求和get请求

package com.brainlong.framework.util.httpclient; import net.sf.json.JSONObject;import org.apache.commons.httpclient.HttpStatus;import org.apache.http.HttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory; import java.io.IOException;import java.net.URLDecoder; public class HttpRequestUtils {  private static Logger logger = LoggerFactory.getLogger(HttpRequestUtils.class);  //日志记录   /**   * httpPost   * @param url 路径   * @param jsonParam 参数   * @return   */  public static JSONObject httpPost(String url,JSONObject jsonParam){    return httpPost(url, jsonParam, false);  }   /**   * post请求   * @param url     url地址   * @param jsonParam   参数   * @param noNeedResponse  不需要返回结果   * @return   */  public static JSONObject httpPost(String url,JSONObject jsonParam, boolean noNeedResponse){    //post请求返回结果    DefaultHttpClient httpClient = new DefaultHttpClient();    JSONObject jsonResult = null;    HttpPost method = new HttpPost(url);    try {      if (null != jsonParam) {        //解决中文乱码问题        StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8");        entity.setContentEncoding("UTF-8");        entity.setContentType("application/json");        method.setEntity(entity);      }      HttpResponse result = httpClient.execute(method);      url = URLDecoder.decode(url, "UTF-8");      /**请求发送成功，并得到响应**/      if (result.getStatusLine().getStatusCode() == 200) {        String str = "";        try {          /**读取服务器返回过来的json字符串数据**/          str = EntityUtils.toString(result.getEntity());          if (noNeedResponse) {            return null;          }          /**把json字符串转换成json对象**/          jsonResult = JSONObject.fromObject(str);        } catch (Exception e) {          logger.error("post请求提交失败:" + url, e);        }      }    } catch (IOException e) {      logger.error("post请求提交失败:" + url, e);    }    return jsonResult;  }   /**   * 发送get请求   * @param url  路径   * @return   */  public static JSONObject httpGet(String url){    //get请求返回结果    JSONObject jsonResult = null;    try {      DefaultHttpClient client = new DefaultHttpClient();      //发送get请求      HttpGet request = new HttpGet(url);      HttpResponse response = client.execute(request);       /**请求发送成功，并得到响应**/      if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {        /**读取服务器返回过来的json字符串数据**/        String strResult = EntityUtils.toString(response.getEntity());        /**把json字符串转换成json对象**/        jsonResult = JSONObject.fromObject(strResult);        url = URLDecoder.decode(url, "UTF-8");      } else {        logger.error("get请求提交失败:" + url);      }    } catch (IOException e) {      logger.error("get请求提交失败:" + url, e);    }    return jsonResult;  }}