java 通过 URL 和 URLConnection 访问网页资源

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package cn.lruihao.base; import java.io.BufferedReader; import java.io.File; import java.io.FileWriter; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection; public class URLReader { public static void main(String[] args) throws Exception{ try { URL lrh=new URL("https://www.lruihao.cn"); File file=new File("C:\\Users\\李瑞豪、\Desktop\\lrh.html"); FileWriter fout=new FileWriter(file); BufferedReader in =new BufferedReader(new InputStreamReader(lrh.openStream()));//字节流转化成字符流，再构建缓冲字符流 String inputLine; while((inputLine=in.readLine())!=null) { System.out.println(inputLine); fout.write(inputLine); } in.close(); fout.close(); //获取响应 header 信息 URLConnection conn=lrh.openConnection(); conn.connect(); System.out.println("获取到的响应长度："+conn.getContentLength()); System.out.println("响应类型："+conn.getContentType()); //用 BufferedReader 读取 URL 的响应 in =new BufferedReader(new InputStreamReader(conn.getInputStream())); String line; String result=null; while((line=in.readLine())!=null) { result+=line; } System.out.println(result); } catch (Exception e) { e.printStackTrace(); } } }