java后台发送http请求（post,get）

import org.apache.http...(jar包)
HttpClient httpClient = new DefaultHttpClient(pccm, httpParams);//httpClient(org.apache.http.client.HttpClient)
HttpPost httpPost =  new HttpPost(url);//post(org.apache.http.client.methods.HttpPost)
httpPost.addHeader("Content-Type","application/x-www-form-urlencoded;charset=utf-8");//请求头
StringEntity stringEntity = new StringEntity({json参数},"UTF-8");//(org.apache.http.entity.StringEntity)
httpPost.setEntity(stringEntity);//请求主体
HttpResponse httpResponse = httpClient.execute(httpPost);//发送请求(org.apache.http.HttpResponse)
HttpEntity httpEntity = httpResponse.getEntity();//获取请求返回体(org.apache.http.HttpEntity)
String backResult =  EntityUtils.toString(httpEntity,"UTF-8");//请求返回结果(org.apache.http.util.EntityUtils)
if(httpResponse != null){
  try{
    EntityUtils.consume(httpResponse.getEntity());
    }catch(IOException e){
    e.printStackTrace();
}
}//释放资源
return backResult;