import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils; import java.io.*; public class Test { public static void main(String[] args) { // Echo.test(); // ChangeSystemOut.test(); Redirecting.test(); } } class Echo { public static void test() { BufferedReader stdin = new BufferedReader( new InputStreamReader(System.in)); try{ String s; while ((s = stdin.readLine()) != null&&s.length()!=0) { System.out.println(s); } } catch (IOException e) { //e.printStackTrace(); throw new RuntimeException(e); } } } class ChangeSystemOut { public static void test() { PrintWriter out = new PrintWriter(System.out,true); out.println("Hello, world"); // out.close(); } } class Redirecting{ public static void test() { try{ PrintStream console = System.out; //创建输入流,用于重定向输入 BufferedInputStream in = new BufferedInputStream( new FileInputStream("./src/Test.java")); //创建输出流,用于重定向输出 PrintStream out = new PrintStream( new FileOutputStream("./src/out")); System.setIn(in); System.setOut(out); System.setErr(out); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); try{ String str; while ((str = br.readLine()) != null) { System.out.println(str); } }finally { br.close(); out.close(); } System.setOut(console); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e){ e.printStackTrace(); } } }
Java编程思想:标准I/O
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转载自www.cnblogs.com/junjie2019/p/10537962.html
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