package com.owen.io;import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;/*** Print流的使用* * @author OwenWilliam 2016-7-20* @since* @version v1.0.0**/
public class TestPrintStream1
{public static void main(String[] args){PrintStream ps = null;try{// 将内容读出到指定文件中FileOutputStream fos = new FileOutputStream("E:\\test\\log.dat");// 使用PrintStream不会抛出异常,关于所有的print的操作都与其有关ps = new PrintStream(fos);} catch (IOException e){e.printStackTrace();}// setOut是将输出的流“管道”对准指定的文件中输出，而不是我们的命令窗口if (ps != null){System.setOut(ps);}int ln = 0;// 输出到控制台，同时也会写入上面的文件for (char c = 0; c <= 60000; c++){System.out.print(c + " ");if (ln++ >= 100){System.out.println();ln = 0;}}}}

4. Print 流例子二

package com.owen.io;import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintStream;/*** Print流文件读出* @author OwenWilliam 2016-7-20* @since* @version v1.0.0**/
public class TestPrintStream2
{public static void main(String[] args){String filename = "E:/workspace/Java/IO/src/com/owen/io/TestPrintStream2.java";if (filename != null){list (filename, System.out);}}/*** 实现指定文件读出* @param f 文件路径* @param fs 读出*/private static void list(String f, PrintStream fs){try{BufferedReader br = new BufferedReader(new FileReader(f));String s = null;while ((s = br.readLine()) != null){fs.println(s);}br.close();} catch (IOException e){fs.println("无法读取文件");}}}

5. Print 流例子三

package com.owen.io;import java.io.BufferedReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Date;/*** 使用Print流实现日志功能* @author OwenWilliam 2016-7-20* @since* @version v1.0.0**/
public class TestPrintStream3
{public static void main(String[] args){String s = null;BufferedReader br = new BufferedReader(new InputStreamReader(System.in));try{//文件写入地方FileWriter fw = new FileWriter("E:\\test\\logfile.log",true);PrintWriter log = new PrintWriter(fw);//一行一行写入while ((s = br.readLine()) != null){if (s.equalsIgnoreCase("exit")) break;System.out.println(s.toUpperCase());log.println("-------");log.println(s.toUpperCase());log.flush();}//结束记录时间log.println("====" + new Date() + "====");log.flush();log.close();} catch (IOException e){e.printStackTrace();}}}