java - 尽管指定的路径系统无法正常执行 mysqldump

Question

这是我的代码，用于从我的数据库中进行备份。它使用 mysql 全局变量获取 mysqldump.exe 的路径。查询 SELECT @@basedir; 返回 C:\Program Files\MySQL\MySQL Server 5.7\，我向其中添加了 bin 文件夹。这是 mysqldump 的正确路径。但是它说 系统找不到指定的文件...!

    public static void backup() {
        try {
            String path = s.createSQLQuery("SELECT @@basedir;").uniqueResult() + "\\bin\\";
            Runtime.getRuntime().exec(
                    "mysqldump -u root -p xxxx aadata > c:\\dump.sql",
                    null,
                    new File(path));
        } catch (IOException ex) {
            Logger.getLogger(ServerGate.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

这里是错误:

java.io.IOException: Cannot run program "mysqldump" (in directory "C:\Program Files\MySQL\MySQL Server 5.7\bin"): CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
at java.lang.Runtime.exec(Runtime.java:620)
at java.lang.Runtime.exec(Runtime.java:450)
at aaserver.ServerGate$DataPipe.backup(ServerGate.java:1631)
at aaclient.main.settings.BackupSettingsPanel.backupNowActionPerformed(BackupSettingsPanel.java:145)
at aaclient.main.settings.BackupSettingsPanel.access$200(BackupSettingsPanel.java:26)
at aaclient.main.settings.BackupSettingsPanel$3.actionPerformed(BackupSettingsPanel.java:74)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6525)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6290)
at java.awt.Container.processEvent(Container.java:2234)
at java.awt.Component.dispatchEventImpl(Component.java:4881)
at java.awt.Container.dispatchEventImpl(Container.java:2292)
at java.awt.Component.dispatchEvent(Component.java:4703)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
at java.awt.Container.dispatchEventImpl(Container.java:2278)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4703)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(ProcessImpl.java:386)
at java.lang.ProcessImpl.start(ProcessImpl.java:137)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
... 42 more

有什么想法吗？

Answer 1

我认为这里的问题是您传递给命令的每个参数都应该是一个单独的字符串元素。例如:

    String[] command = new String[] {
    "mysqldump", 
   "-u"
    ...
    }
Runtime.getRuntime().exec(command);