public static void main(String[] args) { 
 try { 
 //創(chuàng)建字節(jié)輸出流實(shí)例 
 OutputStream out=new FileOutputStream("L:\\test.txt"); 
 //根據(jù)字節(jié)輸出流構(gòu)建字節(jié)緩沖流 
 BufferedOutputStream buf=new BufferedOutputStream(out); 
 String data="好好學(xué)習(xí),天天向上"; 
 buf.write(data.getBytes());//寫(xiě)入緩沖區(qū) 
 buf.flush();//刷新緩沖區(qū)，即把內(nèi)容寫(xiě)入 
 //關(guān)閉流 
 buf.close();//關(guān)閉緩沖流時(shí),也會(huì)刷新一次緩沖區(qū) 
 out.close(); 
} catch (IOException e) { 
 e.printStackTrace(); 
} 
 }

public static void main(String[] args) { 
 try { 
 //創(chuàng)建字節(jié)輸入流實(shí)例 
 InputStream in=new FileInputStream("L:\\test.txt"); 
 //根據(jù)字節(jié)輸入流構(gòu)建字節(jié)緩沖流 
 BufferedInputStream buf=new BufferedInputStream(in); 
 byte[]bytes=new byte[1024]; 
 //數(shù)據(jù)讀取 
 int len=-1; 
 StringBuffer sb=new StringBuffer(); 
 while((len=buf.read(bytes))!=-1) 
 { 
 sb.append(new String(bytes,0,len)); 
 } 
 System.out.println("內(nèi)容為："+sb); 
 //關(guān)閉流 
 buf.close(); 
 in.close(); 

 } catch (IOException e) { 
 e.printStackTrace(); 
 } 
 } 

public static void main(String[] args) { 
 try { 
 Writer w=new FileWriter("L:\\test.txt"); 
 //根據(jù)字符輸出流創(chuàng)建字符緩沖流 
 BufferedWriter buf=new BufferedWriter(w); 
 //寫(xiě)入數(shù)據(jù) 
 buf.write("只要功夫深鐵杵磨成針"); 
 //刷新流 
 buf.flush(); 
 //關(guān)閉流 
 buf.close(); 
 w.close(); 
 } catch (IOException e) { 
 e.printStackTrace(); 
 } 
 } 

public static void main(String[] args) { 
 try { 
 Reader r=new FileReader("L:\\test.txt"); 
 //根據(jù)字符輸入流創(chuàng)建字符緩沖流 
 BufferedReader buf=new BufferedReader(r); 
 char [] data=new char[512]; 
 //數(shù)據(jù)讀取 
 int len=-1; 
 StringBuilder sb=new StringBuilder(); 
 while((len=buf.read(data))!=-1) 
 { 
 sb.append(new String(data,0,len)); 
 } 
 System.out.println("內(nèi)容是： "+sb); 
 //關(guān)閉流 
 buf.close(); 
 r.close(); 
 } catch (IOException e) { 
 e.printStackTrace(); 
 } 
 }