Java代碼

packagestar20110526;

importjava.io.BufferedInputStream;

importjava.io.BufferedOutputStream;

importjava.io.BufferedReader;

importjava.io.File;

importjava.io.FileInputStream;

importjava.io.FileNotFoundException;

importjava.io.FileOutputStream;

importjava.io.FileReader;

importjava.io.IOException;

importjava.io.InputStreamReader;

importjava.io.PrintStream;

importjava.io.PrintWriter;

publicclassRedirecting?{

publicstaticvoidmain(String[]?args)throwsIOException?{

redirect();

//??????readFile();

//??????write("B05\\star20110526\\Redirecting.txt",?read());

}

privatestaticvoidredirect()throwsIOException{

//將輸出定位到PrintStrem，將?System.out重新定義ouputStream

PrintStream?printStream?=?System.out;

//定義輸入流

BufferedInputStream?bufferedInputStream?=?newBufferedInputStream(

newFileInputStream("B05\\star20110526\\Redirecting.java"));

//定義輸出流

PrintStream?printStream2?=?newPrintStream(

newBufferedOutputStream(newFileOutputStream("B05\\star20110526\\Redirect.out")));

//本來System.in是接受控制臺參數的，現在將System.in重新定義到bufferedInputStream

System.setIn(bufferedInputStream);

System.setErr(printStream2);

System.setOut(printStream2);

//InputStreamReader?為適配器，轉換inputStream到Reader，你懂的

BufferedReader?bufferedReader?=?newBufferedReader(newInputStreamReader(System.in));

String?string;

while((string?=?bufferedReader.readLine())?!=null){

System.out.println(string);

}

printStream.close();

printStream2.close();

bufferedReader.close();

System.setOut(printStream);

}

/**

*?讀取文件，然后直接在控制臺打印出來

*?@throws?IOException

*/

privatestaticvoidreadFile()throwsIOException{

File?file?=?newFile("B05\\star20110526\\Redirecting.java");

FileReader?fileReader?=?newFileReader(file);

BufferedReader?bufferedReader?=?newBufferedReader(fileReader);

inti?=1;

String?string;

while((string?=?bufferedReader.readLine())?!=null){

System.out.println(i++?+":"+string);

}

bufferedReader.close();

}

/**

*?讀取文件，返回文件內容，提供文件寫入操作

*?@return

*?@throws?IOException

*/

privatestaticString?read()throwsIOException{

File?file?=?newFile("B05\\star20110526\\Redirecting.java");

BufferedReader?bufferedReader?=?newBufferedReader(

newFileReader(file));

StringBuilder?stringBuilder?=?newStringBuilder();

String?string;

while((string??=?bufferedReader.readLine())?!=null){

stringBuilder.append(string+"\n");

}

returnstringBuilder.toString();

}

/**

*?新建一個文件，然后往文件里面寫文件咯

*?@param?file

*?@param?text

*?@throws?FileNotFoundException

*/

privatestaticvoidwrite(String?file,String?text)throwsFileNotFoundException{

File?file2?=?newFile(file);

PrintWriter?printWriter?=?newPrintWriter(file2);

printWriter.write(text);

//必須關閉流，要不然出不來結果的，(╰_╯)#(╰_╯)#(╰_╯)#

printWriter.close();

}

}package star20110526;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintStream;

import java.io.PrintWriter;

public class Redirecting {

public static void main(String[] args) throws IOException {

redirect();

//readFile();

//write("B05\\star20110526\\Redirecting.txt", read());

}

private static void redirect() throws IOException{

//將輸出定位到PrintStrem，將 System.out重新定義ouputStream

PrintStream printStream = System.out;

//定義輸入流

BufferedInputStream bufferedInputStream = new BufferedInputStream(

new FileInputStream("B05\\star20110526\\Redirecting.java"));

//定義輸出流

PrintStream printStream2 = new PrintStream(

new BufferedOutputStream(new FileOutputStream("B05\\star20110526\\Redirect.out")));

//本來System.in是接受控制臺參數的，現在將System.in重新定義到bufferedInputStream

System.setIn(bufferedInputStream);

System.setErr(printStream2);

System.setOut(printStream2);

//InputStreamReader 為適配器，轉換inputStream到Reader，你懂的

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

String string;

while((string = bufferedReader.readLine()) != null){

System.out.println(string);

}

printStream.close();

printStream2.close();

bufferedReader.close();

System.setOut(printStream);

}

/**

* 讀取文件，然后直接在控制臺打印出來

* @throws IOException

*/

private static void readFile() throws IOException{

File file = new File("B05\\star20110526\\Redirecting.java");

FileReader fileReader = new FileReader(file);

BufferedReader bufferedReader = new BufferedReader(fileReader);

int i = 1;

String string;

while((string = bufferedReader.readLine()) != null){

System.out.println(i++ +":"+string);

}

bufferedReader.close();

}

/**

* 讀取文件，返回文件內容，提供文件寫入操作

* @return

* @throws IOException

*/

private static String read() throws IOException{

File file = new File("B05\\star20110526\\Redirecting.java");

BufferedReader bufferedReader = new BufferedReader(

new FileReader(file));

StringBuilder stringBuilder = new StringBuilder();

String string;

while((string = bufferedReader.readLine()) != null){

stringBuilder.append(string+"\n");

}

return stringBuilder.toString();

}

/**

* 新建一個文件，然后往文件里面寫文件咯

* @param file

* @param text

* @throws FileNotFoundException

*/

private static void write(String file,String text) throws FileNotFoundException{

File file2 = new File(file);

PrintWriter printWriter = new PrintWriter(file2);

printWriter.write(text);

//必須關閉流，要不然出不來結果的，(╰_╯)#(╰_╯)#(╰_╯)#

printWriter.close();

}

}

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