import java.io.*; // 语言促进人的思维 public class TestPrintStream1 { public static void main(String[] args) { PrintStream ps = null; try { FileOutputStream fos = new FileOutputStream("d:\bak\log.dat"); ps = new PrintStream(fos); } catch (IOException e) { e.printStackTrace(); } if (ps != null) { System.setOut(ps); } int ln = 0; for (char c = 0; c <= 60000; c++) { System.out.print(c + " "); if (ln++ >= 100) { System.out.println(); ln = 0; } } } }
import java.io.*; public class TestPrintStream2 { public static void main(String[] args) { String filename = args[0]; if (filename != null) { list(filename, System.out); } } public 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"); } } }
import java.util.*; import java.io.*; public class TestPrintStream3 { public static void main(String[] args) { String s = null; BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); try { FileWriter fw = new FileWriter("d:\share\logfile.log", true); // Log4J // 追加 PrintWriter log = new PrintWriter(fw); while ((s = br.readLine()) != null) { if (s.equalsIgnoreCase("exit")) break; System.out.println(s.toUpperCase()); log.println("-----"); log.println(s.toUpperCase()); log.flush(); } log.println("===" + new Date() + "==="); log.flush(); log.close(); } catch (IOException e) { e.printStackTrace(); } } }