Java基础之复制文本文件二

r囧r小猫 2022-12-13 01:21 137阅读 0赞

package cn.itcast.p1.io.charstream.test;
    
    import java.io.FileReader;
    import java.io.FileWriter;
    import java.io.IOException;
    
    public class CopyTextTest_2 {
        
    
    	private static final int BUFFER_SIZE = 1024;
    
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
        
    
    		FileReader fr = null;
    		FileWriter fw = null;
    		try {
        
    			fr = new FileReader("IO流_2.txt");
    			fw = new FileWriter("copytest_2.txt");
    			
    			//创建一个临时容器，用于缓存读取到的字符。
    			char[] buf = new char[BUFFER_SIZE];//这就是缓冲区。 
    			
    			//定义一个变量记录读取到的字符数，(其实就是往数组里装的字符个数 )
    			int len = 0;
    			
    			while((len=fr.read(buf))!=-1){
        
    				fw.write(buf, 0, len);
    			}
    			
    		} catch (Exception e) {
        
    //			System.out.println("读写失败");
    			throw new RuntimeException("读写失败");
    		}finally{
        
    			if(fw!=null)
    				try {
        
    					fw.close();
    				} catch (IOException e) {
        
    					
    					e.printStackTrace();
    				}
    			if(fr!=null)
    				try {
        
    					fr.close();
    				} catch (IOException e) {
        
    					
    					e.printStackTrace();
    				}
    		}
    	}
    
    }

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