java - 读取 .pem 文件时出错？

Question

这是我的代码:

public class ConnectToDB {

private static final URL PEM_FILE_DIR = Thread.currentThread().getContextClassLoader().getResource("line_scrapper.pem");

private static final Logger LOGGER = Logger.getLogger(ConnectToDB.class);

private static void doSshTunnel(String strSshUser, String strSshPassword, String strSshHost, int nSshPort,
        String strRemoteHost, int nLocalPort, int nRemotePort) throws JSchException, IOException,
        URISyntaxException {
    JSch jsch = new JSch();

    jsch.addIdentity(PEM_FILE_DIR.getPath());
    Session session = jsch.getSession(strSshUser, strSshHost, 22);
    session.setPassword(strSshPassword);

    final Properties config = new Properties();
    config.put("StrictHostKeyChecking", "no");
    session.setConfig(config);

    session.connect();
    session.setPortForwardingL(nLocalPort, strRemoteHost, nRemotePort);
}

public static void ssh() {
    try {
        // System.out.println("start");
        String strSshUser = "ec2-user"; // SSH loging username
        String strSshPassword = "smartbites"; // SSH login password
        String strSshHost = "54.204.144.132"; // hostname or ip or SSH
                                                // server
        int nSshPort = 22; // remote SSH host port number
        String strRemoteHost = "127.0.0.1"; // hostname or ip of your
                                            // database server
        int nLocalPort = 3366; // local port number use to bind SSH tunnel
        int nRemotePort = 3306; // remote port number of your database
        String strDbUser = "root"; // database loging username
        String strDbPassword = "smartbites"; // database login password

        ConnectToDB.doSshTunnel(strSshUser, strSshPassword, strSshHost, nSshPort, strRemoteHost, nLocalPort,
                nRemotePort);

        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:" + nLocalPort
                + "/okpanda_teachers_accounts", strDbUser, strDbPassword);
        con.prepareCall("");
        con.close();
    } catch (Exception e) {
        LOGGER.error("error ", e);

    }
    // finally
    // {
    // System.exit(0);
    // }
}

}

我想连接到数据库(不是本地的，而是在服务器上)并存储数据，为了测试我创建这样的测试类并运行它:

public class HrantTest {


    //  public static void main(String[] args) {
//      test();

//  }

public static void test() {

    ReadingFromTxtFile file = new ReadingFromTxtFile(new File("C:\\Users\\Hrant\\Desktop\\line"), "GMT-8:00");
    ConnectToDB.ssh();
    file.writeForAllFiles();

}

}

我的 line_scrapper.pem 文件位于 resources 文件夹中(它是 Maven 项目)。所以我运行它，它连接到数据库并将数据存储在数据库中。 但是构建之后。 jar 文件，我运行它并抛出异常:

com.jcraft.jsch.JSchException: java.io.FileNotFoundException: file:\D:\Hrant\GitRepos\LineScraper\LineMessangerScraper\target\LineMessangerScraper-0.0.1-SNAPSHOT-jar-with-dependencies.jar!\line_scrapper.pem (The filename, directory name, or volume label syntax is incorrect)
at com.jcraft.jsch.KeyPair.load(KeyPair.java:525)
at com.jcraft.jsch.IdentityFile.newInstance(IdentityFile.java:40)
at com.jcraft.jsch.JSch.addIdentity(JSch.java:393)
at com.jcraft.jsch.JSch.addIdentity(JSch.java:353)
at com.hrant.ConnectToDB.doSshTunnel(ConnectToDB.java:30)
at com.hrant.ConnectToDB.ssh(ConnectToDB.java:57)
at com.hrant.HrantTest.test(HrantTest.java:16)
at com.hrant.gui.LineFrame$3.run(LineFrame.java:124)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: file:\D:\Hrant\GitRepos\LineScraper\LineMessangerScraper\target\LineMessangerScraper-0.0.1-SNAPSHOT-jar-with-dependencies.jar!\line_scrapper.pem (The filename, directory name, or volume label syntax is incorrect)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at com.jcraft.jsch.Util.fromFile(Util.java:508)
at com.jcraft.jsch.KeyPair.load(KeyPair.java:522)
... 12 more

所以我不明白读取 .pem 文件或使用

的问题

jsch.addIdentity(PEM_FILE_DIR.getPath());

那么如何解决这个问题呢？

谢谢。

Answer 1

JSch#addIdentity(String) expects the name of a file on the filesystem ，当它被装进 jar 里时你就没有了；据推测，原因是身份信息(私钥)是敏感的，不应该包含在 jar 中，而应该外部化。

如果有一个压倒性的令人信服的理由来覆盖它，您将需要使用将键作为字节数组传递的重载。您还可以考虑针对 JSch 打开一个错误，以使 PEM 读取器可用于 InputStream 或 Reader。