Https登录并下载文件

悠悠 2023-08-17 16:13 147阅读 0赞

package com.test;
    
    import java.io.FileOutputStream;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.net.Authenticator;
    import java.net.PasswordAuthentication;
    import java.net.URL;
    import java.security.KeyManagementException;
    import java.security.NoSuchAlgorithmException;
    import java.security.cert.X509Certificate;
     
    import javax.net.ssl.HostnameVerifier;
    import javax.net.ssl.HttpsURLConnection;
    import javax.net.ssl.SSLContext;
    import javax.net.ssl.SSLSession;
    import javax.net.ssl.X509TrustManager;
     
    /**
     * 通过Https登录并下载文件。<br>
     * 1.必须是https方式连接。<br>
     * 2.解决Basic认证，即登录框的用户名密码填写操作。
     * 
     * @author Concurrency 2012-12-19
     */
    public class HttpsDownload {
    	public static void main(String[] args) {
    		// Https
    		new HttpsDownload().downloadFile("https://xxx.bin", "D:/test/xxx.bin");
    	}
     
    	/**
    	 * 
    	 * @param httpsURL
    	 *            httpsURL
    	 * @param tempFile
    	 *            temp file path
    	 */
    	private void downloadFile(String httpsURL, String tempFile) {
    		HttpsURLConnection httpsCon = null;
    		FileOutputStream fos = null;
    		InputStream is = null;
    		final int BUFFER_SIZE = 1024;
    		try {
    			// 为Basic认证加上用户名和密码并支持https
    			Authenticator.setDefault(new AddBasicPasswordAndSSL());
    			// 打开URL通道
    			URL url = new URL(httpsURL);
    			httpsCon = (HttpsURLConnection) url.openConnection();
    			// 开始网络连接
    			httpsCon.setConnectTimeout(2000);
    			httpsCon.connect();
    			// 读写的缓存
    			byte[] buffer = new byte[BUFFER_SIZE];
     
    			int size = 0;
    			is = httpsCon.getInputStream();
    			fos = new FileOutputStream(tempFile);
    			// 开始读写文件
    			while ((size = is.read(buffer)) != -1) {
    				fos.write(buffer, 0, size);
    				fos.flush();
    			}
    		} catch (Exception e) {
    			//Exception handle
    		} finally {
    			close(is, fos, httpsCon);
    			System.out.println("end");
    		}
    	}
     
    	private void close(InputStream is, OutputStream os, HttpsURLConnection connection) {
    		try {
    			if (is != null) {
    				is.close();
    			}
    			if (os != null) {
    				os.close();
    			}
    			if (connection != null) {
    				connection.disconnect();
    			}
    		} catch (Exception e) {
    			// nanimosinai
    		}
     
    	}
     
    	/**
    	 * 通过继承Authenticator类为Basic认证加上用户名密码 . 另外用于支持HttpsURLConnection连接
    	 * 
    	 */
    	private class AddBasicPasswordAndSSL extends Authenticator {
    		private final String username = "admin";
    		private final String password = "&TtwQitB2";
     
    		AddBasicPasswordAndSSL() throws KeyManagementException, NoSuchAlgorithmException {
    			MyX509TrustManager xtm = new MyX509TrustManager();
    			MyHostnameVerifier hnv = new MyHostnameVerifier();
    			SSLContext sslContext = null;
    			sslContext = SSLContext.getInstance("TLS"); // 或SSL
    			X509TrustManager[] xtmArray = new X509TrustManager[] { xtm };
    			sslContext.init(null, xtmArray, new java.security.SecureRandom());
     
    			if (sslContext != null) {
    				HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());
    			}
    			HttpsURLConnection.setDefaultHostnameVerifier(hnv);
     
    		}
     
    		// 为Basic认证加上用户名和密码
    		@Override
    		protected PasswordAuthentication getPasswordAuthentication() {
    			return new PasswordAuthentication(username, password.toCharArray());
    		}
    	}
     
    	/**
    	 * 重写X509TrustManager的方法，用于支持https连接。但是并未对服务器的证书作验证，它就会信任任何证书。
    	 * 
    	 */
    	private class MyX509TrustManager implements X509TrustManager {
     
    		/*
    		 * 该方法检查客户端的证书，若不信任该证书则抛出异常。
    		 */
    		@Override
    		public void checkClientTrusted(X509Certificate[] chain, String authType) {
     
    		}
     
    		/*
    		 * 该方法检查服务器的证书，若不信任该证书同样抛出异常。通过自己实现该方法，可以使之信任我们指定的任何证书。在实现该方法时，
    		 * 也可以简单的不做任何处理， 即一个空的函数体，由于不会抛出异常，它就会信任任何证书。
    		 */
    		@Override
    		public void checkServerTrusted(X509Certificate[] chain, String authType) {
     
    		}
     
    		/*
    		 * 返回受信任的X509证书数组。
    		 */
    		@Override
    		public X509Certificate[] getAcceptedIssuers() {
    			return null;
     
    		}
     
    	}
     
    	/**
    	 * hostname verification
    	 * 
    	 */
    	private class MyHostnameVerifier implements HostnameVerifier {
     
    		@Override
    		public boolean verify(String hostname, SSLSession session) {
    			return true;
    		}
    	}
    }

转载于:https://www.cnblogs.com/jackszc/p/11506752.html