用java代码如何备份postgreSQL数据库

用java代码如何备份postgreSQL数据库，正常在cmd里面输入第二行会有输入密码的提示，如果写在代码里，如何一行命令行命令能解决呢？

cmd中需要登录数据库才能进入数据库来进行数据备份。
java代码中通过驱动连接数据库后，就可以了。

• 你看下这篇博客吧, 应该有用👉 ：JAVA连接PostgreSQL数据库

public void backupPGSQL(){
  try{
    Runtime r =Runtime.getRuntime();
    //Path to the place we store our backup
    String rutaCT = "C:\\BAKCUPS\\";
    //PostgreSQL variables
    String IP = "192.168.1.1";
    String user = "postgres";
    String dbase = "yourDataBase";
    String password = "yourPassword";
    Process p;
    ProcessBuilder pb;
    InputStreamReader reader;
    BufferedReader buf_reader;
    String line;
    //We build a string with today's date (This will be the backup's filename)
    java.util.TimeZone zonah = java.util.TimeZone.getTimeZone("GMT+1");
    java.util.Calendar Calendario = java.util.GregorianCalendar.getInstance( zonah, new java.util.Locale("es"));
    java.text.SimpleDateFormat df = new java.text.SimpleDateFormat("yyyyMMdd");
    StringBuffer date = new StringBuffer();
    date.append(df.format(Calendario.getTime()));
    java.io.File file = new java.io.File(rutaCT);
    // We test if the path to our programs exists
    if (file.exists()) {
      // We then test if the file we're going to generate exist too. If so we will delete it
      StringBuffer fechafile = new StringBuffer();
      fechafile.append(rutaCT);
      fechafile.append(date.toString());
      fechafile.append(".backup");
      java.io.File ficherofile = new java.io.File(fechafile.toString());
      if (ficherofile.exists()) {
        ficherofile.delete();
      }
      r = Runtime.getRuntime();
      pb = new ProcessBuilder(rutaCT + "pg_dump.exe", "-f", fechafile.toString(),
          "-F", "c", "-Z", "9", "-v", "-o", "-h",IP, "-U", user, dbase);
      pb.environment().put("PGPASSWORD", password);
      pb.redirectErrorStream(true);
      p = pb.start();
      try {
        InputStream is = p.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
        String ll;
        while ((ll = br.readLine()) != null) {
          System.out.println(ll);
        }
      } catch (IOException e) {
        log("ERROR "+e.getMessage(), e);
      }
    }
  } catch(IOException x) {
    System.err.println("Could not invoke browser, command=");
    System.err.println("Caught: " + x.getMessage());
  }
}

直接使用jdbc连接数据库，用户名，密码都可以写在代码里，然后再postgres中自定义一个备份存储过程，使用java代码调用存储过程就可以了