HttpURLConnection的一些用法

最新推荐文章于 2024-03-06 11:14:13 发布

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本文详细介绍了HTTPURLConnection类的使用方法，包括如何获取响应状态码、断开链接等核心功能，并阐述了解决编码问题的策略，推荐使用URLEncoder.encode进行编码。

HttpURLConnection: 也是一个抽象类，这是一个继承URLConnection的子类，一些方法在URLConnection中已经熟悉。

相关方法:

|--disConnect(): 断开链接

|--getResponceCode(): 得到响应状态码

代码示意:

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
 
public class HttpURLConnectionDemo01 {
	
	public static void main(String[] args) throws Exception {
		String spec = "https://ss0.baidu.com/7Po3dSag_xI4khGko9WTAnF6hhy/news/q=100/sign=643ba8b7d20735fa97f04ab9ae500f9f/8ad4b31c8701a18b48f518e3982f07082838fe04.jpg";
		//确定资源的位置
		URL url = new URL(spec);
		
		//打开链接
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		
		//得到状态码
		int status = conn.getResponseCode();
		
		
		if (status == 200) {
			//链接成功
			//开始下载
			//获得流
			BufferedInputStream bis = new BufferedInputStream(conn.getInputStream());
			BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("a3.jpg"));
			
			byte[] b = new byte[1024];
			int len = 0;
			
			while ((len = bis.read(b)) != -1) {
				bos.write(b, 0, len);
			}
			
			//关流
			bos.flush();
			bos.close();
			bis.close();
			
			//关闭连接
			conn.disconnect();
			
		}else{
			System.out.println("成妾做不到啊");
		}
	}
 
}

下面是一个本地的写法:

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
 
public class HttpURLConnectionDemo02 {
 
	public static void main(String[] args) throws Exception {
		String spec = "http://127.0.0.1:8080/day028_web/LoginServlet";
		String userName = "Mixm";
		String passWord = "0906";
		String strSend = "userName=" + userName+"&passWord="+ passWord;
		
		//确定资源 
		URL url = new URL(spec);
		//得到链接
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		
		//发送数据
		conn.setDoOutput(true);
		OutputStream os = conn.getOutputStream();
		os.write(strSend.getBytes());
		
		//获得状态码
		int status = conn.getResponseCode();
		
		//判断状态码
		if (status == 200) {
			BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			System.out.println(br.readLine());
			br.close();
			
		} else {
			System.out.println("臣妾做不到啊");
		}
		
		os.close();
		conn.disconnect();
	}
 
}