Java IO流(二)

9. FileReader循环读取，判断读取到文件末尾

        /**
      * 循环读取，判断读取到文件末尾
      */ 
     public static void readFileByChar2(){ 
          
         try { 
             FileReader fr = new FileReader(filepath); 
             char[] c = new char[1024]; 
             int len=0; 
             while((len= fr.read(c))!=-1){ 
                 System.out.println(new String(c,0,len)); 
             } 
             fr.close(); 
          
         } catch (FileNotFoundException e) { 
             e.printStackTrace(); 
         } catch (IOException e) { 
             e.printStackTrace(); 
         } 
     }

10.复制文件

   /**
      * 复制文件
      * @param path1
      * @param path2
      */ 
     public static void copyFile(String path1,String path2){ 
          
         try { 
             FileInputStream in = new FileInputStream(path1); 
             FileOutputStream out = new FileOutputStream(path2); 
              
             byte[] b = new byte[1024]; 
             int len = 0; 
             while((len=in.read(b))!=-1){ 
                 out.write(b, 0, len); 
             } 
             in.close(); 
             out.close(); 
         } catch (IOException e) { 
         } 
     }

11. OutputStreramWriter 和 InputStreamReader

    OutputStreramWriter 和InputStreamReader类 
  
     整个IO类中除了字节流和字符流还包括字节和字符转换流。 
  
     OutputStreramWriter将输出的字符流转化为字节流 
  
     InputStreamReader将输入的字节流转换为字符流

 public static void  OutputStreramWriterDemo1(){ 
          
         try { 
             Writer writer = new OutputStreamWriter(new FileOutputStream(copypath)); 
             writer.write("hello"); 
             writer.close(); 
         } catch (FileNotFoundException e) { 
             e.printStackTrace(); 
         } catch (IOException e) { 
             e.printStackTrace(); 
         } 
          
     }

 public static void InputStreamReaderDemo1(){ 
          
         try { 
             Reader reader = new java.io.InputStreamReader(new FileInputStream(filepath)); 
             char[] c = new char[100]; 
             int len = 0; 
             len = reader.read(c); 
             System.out.println(new String(c,0,len)); 
             reader.close(); 
              
         } catch (FileNotFoundException e) { 
             e.printStackTrace(); 
         } catch (IOException e) { 
             e.printStackTrace(); 
         } 
     }

   public static void printStreamDemo1(){ 
          
         try { 
             PrintStream print = new PrintStream(new FileOutputStream(filepath)); 
             print.print(true); 
             print.print("yaya"); 
             String name="Rollen"; 
             Integer age = 20; 
             // 格式化输出 
             print.printf("姓名：%s. 年龄：%d.", new Object[]{name,age}); 
             print.close(); 
             print.close(); 
         } catch (FileNotFoundException e) { 
             e.printStackTrace(); 
         } 
     }

输入输出重