java使用httpclient发送post请求示例

package org.ssi.util;

import java.io.ioexception;
import java.util.arraylist;
import java.util.list;

import net.sf.json.jsonarray;

import org.apache.commons.lang.exception.exceptionutils;
import org.apache.commons.logging.log;
import org.apache.commons.logging.logfactory;
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.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;

public class apihttpclient {

 //接口地址
 private string apiurl = "";
 private log logger = logfactory.getlog(this.getclass());
 private static final string pattern = "yyyy-mm-dd hh:mm:ss:sss";
        private httpclient httpclient = null;
 private httppost method = null;
 private long starttime = 0l;
 private long endtime = 0l;
 private int status = 0;
 /**
  * 接口地址
  * @param url
  */
 public apihttpclient(string url){

  if(url != null)
  {
   this.apiurl = url;
  }
  if(apiurl != null)
  {
                    httpclient = new defaulthttpclient();
                    method = new httppost(apiurl);

  }
 }

 /**
  * 调用 api
  * @param parameters
  * @return
  */
 public string post(string parameters)
 {
  string body = null;
                logger.info("parameters:" + parameters);

               
  if(method != null & parameters != null  && !"".equals(parameters.trim()))
  {
                    jsonarray jsonobject = jsonarray.fromobject(parameters);
                    logger.info("json:" + jsonobject.tostring());
                    try{

                        list<namevaluepair> params=new arraylist<namevaluepair>(); 
                        //建立一个namevaluepair数组，用于存储欲传送的参数 
                        params.add(new basicnamevaluepair("data",parameters)); 
                        //添加参数 
                        method.setentity(new urlencodedformentity(params,http.utf_8)); 

                        starttime = system.currenttimemillis();

                        //设置编码 
                        httpresponse response=httpclient.execute(method); 
                        endtime = system.currenttimemillis();
                        int statuscode = response.getstatusline().getstatuscode();
                        logger.info("statuscode:" + statuscode);
                         logger.info("调用api 花费时间(单位：毫秒)：" + (endtime - starttime));
                        if(statuscode != httpstatus.sc_ok){
                            logger.error("method failed:"+response.getstatusline());
                            status = 1;
                        }

                            //read the response body
                             body=entityutils.tostring(response.getentity());

   }catch(ioexception e){
    //发生网络异常
    logger.error("exception occurred!\n"+exceptionutils.getfullstacktrace(e));
    //网络错误
    status = 3;
   }
                    finally{
                        logger.info("调用接口状态：" + status);
                    }

   
  }
  return body;
 }

 /**
  * 0.成功 1.执行方法失败 2.协议错误 3.网络错误
  * @return the status
  */
 public int getstatus() {
  return status;
 }

 /**
  * @param status the status to set
  */
 public void setstatus(int status) {
  this.status = status;
 }
 /**
  * @return the starttime
  */
 public long getstarttime() {
  return starttime;
 }
 /**
  * @return the endtime
  */
 public long getendtime() {
  return endtime;
 }
}