Java HttpClient-优快云博客

本文链接：https://blog.youkuaiyun.com/zhangzikui/article/details/83508410

本文介绍了一个使用Java实现的HTTP POST请求示例，通过HttpURLConnection发送POST请求，并设置请求头，包括Content-Type为application/json，同时展示了如何读取响应结果。

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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpClient
{
	public static String sendHttpRequest(String httpURL, String requestData) throws IOException
	{
		URL targetURL = new URL(httpURL);
		
		HttpURLConnection httpConnection = (HttpURLConnection)(targetURL.openConnection());
		httpConnection.setRequestMethod("POST");
		httpConnection.setRequestProperty("accept", "*/*");
		httpConnection.setRequestProperty("Connection", "keep-alive");
		httpConnection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
		httpConnection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
		httpConnection.setConnectTimeout(30000);
		httpConnection.setReadTimeout(120000);
		httpConnection.setDoInput(true);
		httpConnection.setDoOutput(true);
		httpConnection.setUseCaches(false);
		
		httpConnection.connect();
		
		if(requestData != null && !("".equals(requestData.trim())))
		{
			PrintWriter pw = new PrintWriter(new OutputStreamWriter(httpConnection.getOutputStream(), "UTF-8"));
			pw.println(requestData);
			pw.flush();
			pw.close();
		}
		
		StringBuffer responseStringBuffer = new StringBuffer("");
		BufferedReader reader = new BufferedReader(new InputStreamReader(httpConnection.getInputStream(), "UTF-8"));
		
		String lineString = null;
		while((lineString = reader.readLine()) != null)
		{
			responseStringBuffer.append(lineString);
		}

		try
		{
			reader.close();
		}
		catch(Exception e4)
		{
			e4.printStackTrace();
		}
		
		httpConnection.disconnect();
		return responseStringBuffer.toString();
	}
	
}