java ProcessBuilder 重定向输出
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ProcessBuilder redirecting output
提问by Chandra
I am trying to redirect output of a process started with the help of ProcessBuilder using following code
我正在尝试使用以下代码重定向在 ProcessBuilder 的帮助下启动的进程的输出
ProcessBuilder pb = new ProcessBuilder("/myScript >> /myLogFile 2>&1 <& - &");
Map<String, String> env = pb.environment();
env.clear();
env.put("var1", "val1");
env.put("var2", "val2");
pb.redirectErrorStream(true);
Process p = pb.start();
But it failed with exception
但它无一例外地失败了
Exception in thread "main" java.io.IOException: Cannot run program "/myScript >> /myLogFile 2>&1 <& - &": java.io.IOException: error=2, No such file or directory at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
线程“main”中的异常 java.io.IOException：无法运行程序“/myScript >> /myLogFile 2>&1 <& - &”：java.io.IOException：error=2，java.lang 中没有这样的文件或目录.ProcessBuilder.start(ProcessBuilder.java:460)
It works fine when I just pass "/myScript"
当我只通过“/myScript”时它工作正常
Script is perl, any suggestions/coments on why it is failing?
脚本是 perl，关于它为什么失败的任何建议/评论？
I tried passing all of them as seperate arguments like new ProcessBuilder("/myScript",">>","/myLogFile"), it executes but it does not redirect to log file and also it does not take envVars.
我尝试将所有这些作为单独的参数传递，例如new ProcessBuilder("/myScript",">>","/myLogFile")，它会执行但它不会重定向到日志文件，也不会使用 envVars。
回答by trashgod
Shell redirection operators are unknown to ProcessBuilder. Put your command in a shell script and execute it, as shown here. Alternatively, use bash -c, as shown here.
外壳重定向操作符是未知的ProcessBuilder。把你的命令在shell脚本并执行它，如图所示这里。另外，使用bash -c，如图所示这里。
回答by Hyman
As you specified, from Java7 you can keep using ProcessBuilder with the only executable file as parameter and redirect/intercept its output stream, using redirectInput()redirectOutput()and redirectError()from ProcessBuilderclass.
正如您所指定的，从 Java7 开始，您可以继续使用 ProcessBuilder 并将唯一的可执行文件作为参数并重定向/拦截其输出流，使用redirectInput()redirectOutput()和redirectError()来自ProcessBuilder类。
