Question

String dumpCommand = "C:\\Program Files\\MySQL\\MySQL Server 5.0\\bin\\mysqldump" + " -u " + user + " -p" + " " + database + " > " + path;         
Runtime rt = Runtime.getRuntime();
File test = new File(path);
PrintStream ps;
try{
    Process child = rt.exec(dumpCommand);
    System.out.println("Child" + child);
    ps = new PrintStream(test);
    InputStream in = child.getInputStream();
    int ch;

    while ((ch = in.read()) != -1) {
        ps.write(ch);
        System.out.write(ch);
    }         
}

代码无效。它无限运行？如何在java上运行mysqldump？

Answer 1

由于您要运行的命令的路径包含空格，因此需要围绕它的引号：

String dumpCommand = "\"C:\\Program Files\\MySQL\\MySQL Server 5.0\\bin\\mysqldump\""+ " -u " + user +" -p" + " "+ database +" > "+path;

修改

ProcessBuilder会让这项工作更轻松：

// Step 1: set up the command line ProcessBuilder pb = new ProcessBuilder( "C:\\Program Files\\MySQL\\MySQL Server 5.0\\bin\\mysqldump", "-u", user, "-p" database); // Step 2: redirect output File test = new File(path); pb.redirectOutput(test); // Step 3: start the process Process proc = pb.start();

ProcessBuilder类具有许多其他功能（请参阅文档），包括为子进程定义环境变量，设置当前目录和重定向错误输出的功能。如果出现问题，后者可能对诊断问题非常有用。

Answer 2

或者您可以使用String.trim（）方法过滤掉空格。

代码不工作。无限运行？

2 个答案: