重定向控制檯System.out.println輸出到文件，再重定向回控制檯

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.PrintStream;

public class Test {

public static void main(String[] args) {

PrintStream printStream = null;

PrintStream sysout = System.out;

PrintStream syserr = System.err;

try {

File file = new File("c:\\systemout.log");

if (!file.exists()) {

try {

file.createNewFile();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

printStream = new PrintStream(new FileOutputStream(new File(

"c:\\systemout.log"), true));

// set output to file instead of console

System.setOut(printStream);

System.setErr(printStream);

System.out.println("Before Redirect:System.out.println");

System.err.println("Before Redirect:System.err.println");

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} finally {

if (printStream != null) {

printStream.close();

}

// Reset the output to console

System.setOut(sysout);

System.setErr(syserr);

System.out.println("After Redirect:System.out.println");

System.err.println("After Redirect:System.err.println");

}

}

}