Java输入输出重定向代码

 try {  
BufferedInputStream in = new BufferedInputStream(new FileInputStream("input.txt"));
 System.setIn(in);
 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

 
PrintStream out = System.out; // 保存原输出流
PrintStream ps=new PrintStream("./output.txt"); // 创建文件输出流
System.setOut(ps); // 设置使用新的输出流

// String s;
//  while((s = br.readLine())!=null)
//  System.out.println(s);
 
 
} catch (FileNotFoundException e) { 
e.printStackTrace(); 
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
} 
try{PrintStream out =
new PrintStream(
new BufferedOutputStream(
new FileOutputStream("test.out")));}
  catch(IOException e) {
e.printStackTrace();
}