在执行期间制定文件位置并读取。利用BufferedReader与FileReader

import java.io.*;public class TestPrintStreamToReadingFile {public static void showOut(String str, PrintStream pstr){try{BufferedReader br = new BufferedReader(new FileReader(str));String s = null;while((s = br.readLine()) != null){pstr.println(s);}br.close();}catch(IOException ioe){pstr.println("Can not reading your file");ioe.printStackTrace();}}public static void main(String[] args) {String fileName = args[0];if(fileName != null){showOut(fileName, System.out);}}}