Java实现cRUL

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你可以使用 java.net.URL 或者 java.net.URLConnection.

如下访问百度首页并将文件保存到D:/Baidu.html

public class TestJavaURL {    public static void curl(String addr){        try {            URL url = new URL(addr);            String line = "";            FileOutputStream fo = new FileOutputStream(new File("D:/Baidu.html"));            BufferedOutputStream oBuffer = new BufferedOutputStream(fo);            BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream(),"UTF-8"));            while ((line = reader.readLine()) != null){                System.out.println(line);                line += "\n";                oBuffer.write(line.getBytes());            }            oBuffer.flush();            oBuffer.close();        }catch (MalformedURLException e){            System.out.println(e.getMessage());        }catch (IOException e){            System.out.println(e.getMessage());        }    }}

注意直接写www.baidu.com会报错：no protocol: www.baidu.com。你需要加上 http:// 前缀来指明协议

运行：

public class MainClass {    public static void main(String[] args) {        TestJavaURL.curl("http://www.baidu.com");    }}

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