无法在linux中从java调用mysqldump

Question

这是代码:

public static File backupDB() throws IOException {

    File file = null;

    file = new File("BKUP_DB_"
            +   Calendar.getInstance()).replace("/", "-") + ".sql");

    String executeCmd = "mysqldump -u " + "dbUserName" + " -p" + "dbPassword"
    + " " + "dbName" + " > " +file.getPath();



    Process runtimeProcess;
    try {

        runtimeProcess = Runtime.getRuntime().exec(executeCmd);
        int processComplete = runtimeProcess.waitFor();

        if (processComplete == 0) {
            System.out.println("Backup created successfully");
            runtimeProcess.destroy();
            return file;
        } else {

            System.out.println("Could not create the backup");
        }

    } catch (Exception ex) {
        ex.printStackTrace();

    }

    return file;
}

我试过使用mysqldump的完整路径,/usr/bin/mysqldum但似乎没有任何工作,我怀疑有关Linux的权限问题.你必须是root才能创建一个mysql备份吗？如果没有,这段代码有什么问题？如果是,linux有什么问题:D？我该如何解决这个问题.谢谢.

Answer 1

元字符">"由shell实现; 运行程序时不涉及shell,Runtime.exec()因此最后两个参数mysqldump是垃圾.使用数组参数形式Runtime.exec(); 传递"/ bin/sh"作为第一个参数," - c"作为第二个参数,命令行作为第三个参数; 这样,shell元字符将由/ bin/sh解释.