Java使用ProcessBuilder创建子进程出现错误:CreateProcess error=87

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Exception occurred executing command line. Cannot run program... CreateProcess error=87, The parameter is incorrect


网上说的错误原因是CLASSPATH过长,但我测试发现,还有一种原因


根据ProcessBuilder的构造器,
<pre name="code" class="java">/*** Constructs a process builder with the specified operating system program and arguments. * This is a convenience constructor that sets the process builder's command to a string * list containing the same strings as the command array, in the same order. It is not * checked whether command corresponds to a valid operating system command.* Parameters:* command a string array containing the program and its arguments**/public ProcessBuilder(String... command) {}
对于command参数,首个参数是命令,如果使用的是相对路径,该命令还会从操作系统的PATH环境变量中去搜寻。

如果默认不是.bat或者.exe后缀,比如(.cmd),那么需要显示加上后缀,然后其余是命令后依次所跟的参数。


还有一点需要注意的是:如果ProcessBuilder使用.bat或者.cmd发起的批处理命令,那么返回的Process对象表示的是这个批处理进程,而不是真正所执行的批处理中的那个exe命令子进程,也就是说,当你调用Process对象上的destroy方法,只相当于关闭了命令行窗口,并没有把实质的exe进程关闭掉。


public ProcessBuilder directory(File workingDirectory)
设置当前启动的子进程运行在哪个工作目录下


/*** Sets the source and destination for subprocess standard I/O to be the same as * those of the current Java process. * This is a convenience method.**/public ProcessBuilder inheritIO();
设置启动的子进程的输入输出控制台与父进程相同


public Process start();
启动子进程,返回Process对象,可以调用该对象的destroy来杀掉子进程


举例:

Process myProc = new ProcessBuilder("mycommand.exe", "arg1", "arg2", "args").directory(myWorkingDirectory).inheritIO().start();//any other code heremyProc.destroy();




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