HTTPClients的客户端执行请求,并获取响应，响应中解析具体的报文内容，最后返回请求内容将其转换成字符串

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HttpRequestUtil是一个Java工具类，用于执行HTTP的GET、POST、DELETE、PUT请求。它使用Apache HttpClient库，处理请求和响应，包括检查URL的有效性，处理异常，并将响应内容转化为字符串。

package com.fast.sky.util;

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.alibaba.fastjson.JSONObject;
import com.fast.sky.domain.UserEntity;

/**

JDK version:1.8
extends：
implements：

*--------------------------------------------------------------

V1.0 创建杨光 2019年6月7日
*--------------------------------------------------------------

*/
public class HttpRequestUtil {

private static final Logger logger = LoggerFactory.getLogger(HttpRequestUtil.class);
private static CloseableHttpResponse response = null;
private static HttpEntity httpEntity = null;
private static StringEntity entity = null;

/**

执行HTTP GET类型请求
@param requestURL/请求地址

@return 响应字符串
*/
public synchronized static String httpGet(String requestURL)
{
try
{

  if(null==requestURL || !requestURL.startsWith("http"))
  {
  	logger.debug("The url is not exist ! Please check your Http request url ."); 
  }  
  //1.创建请求类型：GET
  HttpGet get = new HttpGet(requestURL); 
  //为请求类型的头部添加信息
  get.addHeader("Content-Type", "application/json;charset=utf-8");
  //2.利用HTTPClients的客户端执行请求,并获取响应
  response = HttpClients.custom().build().execute(get);
  int code = response.getStatusLine().getStatusCode();//获取执行之后的状态码，200执行正常
  if(200 != code)
  {
  	throw new RuntimeException("HTTP GET Request Failed with Error code : " + code);
  }
  //3.从响应中解析具体的报文内容
  httpEntity = response.getEntity();
  //4.最后返回请求内容将其转换成字符串
  return EntityUtils.toString(httpEntity , "UTF-8");

}
catch (Exception e)
{
return “请求异常”;
}
}

/**

执行HTTP POST类型请求
@param requestURL/请求地址
@param data/附带参数

@return 响应字符串
*/
public synchronized static String httpPostRequest(String requestURL , String data)
{
try
{
if(null==requestURL || !requestURL.startsWith(“http”))
{
logger.error(“The url is not exist ! Please check your Http request url.”);
}

 HttpPost post = new HttpPost(requestURL.trim()); 
 post.setHeader("Content-Type", "application/json;charset=utf-8");
 entity = new StringEntity(data , ContentType.APPLICATION_JSON );
 post.setEntity(entity);
 
 response = HttpClients.custom().build().execute(post);
 int code = response.getStatusLine().getStatusCode();
 if(200 != code) {
 	throw new RuntimeException("HTTP POST Request Failed with Error code : " + code);
  }
 httpEntity = response.getEntity();
 return EntityUtils.toString(httpEntity , "UTF-8");

}
catch (Exception e)
{
return “请求异常”;
}
}

/**

执行HTTP DELETE类型请求
@param requestURL/请求地址

@return 响应字符串
*/
public synchronized static String httpDeleteRequest(String requestURL)
{
try
{
if(null == requestURL || !requestURL.startsWith(“http”))
{
logger.debug(“The url is not exist ! Please check your Http request url.”);
}

 HttpDelete delete  = new HttpDelete(requestURL.trim()); 
 delete.addHeader("Content-Type", "application/json;charset=utf-8");
 
 
 response = HttpClients.custom().build().execute(delete);
 int code = response.getStatusLine().getStatusCode();
 if(200 != code)
 {
 	throw new RuntimeException("HTTP DELETE Request Failed with Error code : " + code);
 }
 httpEntity = response.getEntity();
 return EntityUtils.toString(httpEntity , "UTF-8");

}
catch (Exception e)
{
return “请求异常”;
}
}

/**

执行HTTP PUT类型请求
@param requestURL/请求地址
@param data/附带参数

@return 响应字符串
*/
public synchronized static String httpPutRequest(String requestURL, String data)
{
try
{
if(null==requestURL || !requestURL.startsWith(“http”))
{
logger.debug(“The url is not exist ! Please check your Http request url.”);
}

HttpPut put = new HttpPut(requestURL.trim()); 
put.setHeader("Content-Type", "application/json;charset=utf-8");
entity = new StringEntity(data , ContentType.APPLICATION_JSON );
put.setEntity(entity);

response = HttpClients.custom().build().execute(put);
int code = response.getStatusLine().getStatusCode();
if(200 != code) 
{
 	throw new RuntimeException("HTTP PUT Request Failed with Error code : " + code);
 }
httpEntity = response.getEntity();
return EntityUtils.toString(httpEntity , "UTF-8");

}
catch (Exception e)
{
return “请求异常”;
}
}

}