Runtime.exec无法在JDK 7u25上运行

Question

After update java to latest version 7u25, the runtime.getruntime().exec can't work anymore.

//jhghai_w.filepath = "C:\\aucs\\data\\tmp.txt";
br = new BufferedReader(new InputStreamReader(Runtime.getRuntime()
                    .exec("CMD.EXE /C \"C:\\Program Files\\juman\\juman.exe \" -e < "+jhghai_w.filepath)
                    .getInputStream()));

I already read the reference:JDK 7u25: Solutions to Issues caused by changes to Runtime.exec https://blogs.oracle.com/thejavatutorials/entry/changes_to_runtime_exec_problems

and tried some modifications as below:

br = new BufferedReader(new InputStreamReader(Runtime.getRuntime()
                    .exec("CMD.EXE /C \"C:\\Program Files\\juman\\juman.exe  -e < \""+jhghai_w.filepath)
                    .getInputStream()));

and this:

br = new BufferedReader(new InputStreamReader(Runtime.getRuntime()
                    .exec(new String[] {"cmd","/C" "C:\\Program Files\\juman\\juman.exe"-e < "，jhghai_w.filepath})
                    .getInputStream()));

and this:

br = new BufferedReader(new InputStreamReader(Runtime.getRuntime()
                    .exec(new String[] {"cmd","/C" "C:\\Program Files\\juman\\juman.exe","-e“，”<"，jhghai_w.filepath})
                    .getInputStream()));

and this:

br = new BufferedReader(new InputStreamReader(Runtime.getRuntime()
                    .exec(new String[] {"cmd","/C" "\"C:\\Program Files\\juman\\juman.exe"","\"-e < \""，jhghai_w.filepath})
                    .getInputStream()));

I even replace the "jhghai_w.filepath" to "C:\\aucs\\data\\tmp.txt" directly. But the are not working. What's the problem in my modification?

Answer 1

You should not be using Runtime.exec() to begin with, for practical purposes is deprecated. Better switch to using ProcessBuilder . There are plenty of tutorials to show you the way.

Answer 2

You should pass your command to Runtime.exec() or your ProcessBuilder as a String-Array with three elements: the command as the first, "/C" as the second and the command to be executed in cmd as the third element:

String[] command = new String[3];
command[0] = "CMD.EXE";
command[1] = "/C";
command[2] = "\"C:\\Program Files\\juman\\juman.exe \" -e < "+jhghai_w.filepath;
ProcessBuilder pb = new ProcessBuilder(command);
pb.start();

See also this blogpost especially this section:

---

The Golden Rule:

In most cases, cmd.exe has two arguments: "/C" and the command for interpretation.

---

Edit: updated solution....