Java ProcessBuilder具有多个带空格的参数

  • Z时代
  • 2024-01-10
  • 分类：问答

我知道关于从Java执行流程有很多解决的问题，但是我无法使用提供的答案解决问题。我正在尝试从Java应用程序创建postgresql数据库备份。我使用以下代码

        //ProcessBuilder probuilder = new ProcessBuilder(new String[]{"cmd","/c","D:/PostgreSQL 8.2/bin/pg_dump.exe","-U","usr","-i","-h","localhost","-p","5432","-F","c","-b","-f","D:/backup test/backups/test_27-1-2013_210.backup", "test"});
        //ProcessBuilder probuilder = new ProcessBuilder(new String[]{"cmd","/c","D:\\PostgreSQL 8.2\\bin\\pg_dump.exe","-U","usr","-i","-h","localhost","-p","5432","-F","c","-b","-f","D:\\backup test\\backups\\test_27-1-2013_210.backup", "test"});
        ProcessBuilder probuilder = new ProcessBuilder(new String[]{"cmd","/c","\"D:\\PostgreSQL 8.2\\bin\\pg_dump.exe\"","-U","usr","-i","-h","localhost","-p","5432","-F","c","-b","-f","\"D:\\backup test\\backups\\test_27-1-2013_210.backup\"", "test"});
        Map<String, String> env = probuilder.environment();
        env.put("PGPASSWORD", "mypass");
        final Process process = probuilder.start();

执行以上代码后，出现以下错误： D:\PostgreSQL' is not recognized as an internal or external

command, operable program or batch file.

仅当备份文件的路径包含空格时才出现问题，否则将创建备份。我试图在文件路径中同时使用斜杠和反斜杠，但我引用了文件路径，但每次都遇到相同的错误。可以从命令提示符处执行命令。

我做错了。关于ProcessBuilder中带空格的参数数量是否有一些限制。谢谢

回答：

由于pg_dump.exe是exe文件（而不是.bat文件），因此您根本不需要cmd它，并且它可能会引起更多问题，甚至无法解决。只需exe直接调用，然后删除文件路径周围多余的引号即可：

new String[]{"D:\\PostgreSQL 8.2\\bin\\pg_dump.exe","-U","usr","-i",
  "-h","localhost","-p","5432","-F","c","-b",
  "-f","D:\\backup test\\backups\\test_27-1-2013_210.backup", "test"}

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