从源代码中获取并获取java程序的I/O.

Question

如何编写一个程序,它将运行另一个java程序(应该调用该程序)从该程序向该程序提供输入并获取输出并将输出打印到文件.

Answer 1

使用ProcessBuilder

例:

ProcessBuilder pb = new ProcessBuilder("myCommand", "myArg1", "myArg2");
Process p = pb.start();
InputStream in = p.getInputStream();
OutputStream out = p.getOutputStream();


// Write to input of the program using outputstream here
...

// Read output of program from input stream here
// ...


FileOutputStream fileOut = new FileOutputStream("output.txt");
BufferedInputStream bIn = new BufferedInputStream(in);

byte buf = new byte[4096];
int count;

while ((count = bIn.read(buf)) != -1) {
    fileOut.write(buf, 0, count);
}

...
fileOut.close();
bIn.close();

// Exception handling is left as an exercise for the reader :-P