编程实现文件复制和重命名

痛定思痛。 2022-06-16 11:25 294阅读 0赞

编写一个程序，将d:\\java目录下的所有.java文件复制到d:\\jad目录下，并将原来文件的扩展名从.java改为.jad。

package com.alex.test3;
    
    import java.io.File;
    import java.io.FileFilter;
    import java.io.FileReader;
    import java.io.FileWriter;
    import java.io.IOException;
    
    public class Java2Jad {
    
    	/**
    	 * @param args
    	 * @throws Exception 
    	 */
    	public static void main(String[] args) throws Exception {
    		File javaFile = new File("D:\\java");
    		File[] javaFiles=null;
    		if(javaFile.exists()&&javaFile.isDirectory()){
    			javaFiles=javaFile.listFiles(
    					new FileFilter(){
    						public boolean accept(File pathname) {
    							return pathname.getName().endsWith(".java");
    						}
    						
    					});
    			copyAndRenameFiles(javaFiles,"D:\\jad","\\.java",".jad");
    			System.out.println("copy successful...");
    			
    		}else{
    			throw new Exception("there are not such directroy");
    		}
    
    	}
    	
    	public static void copyAndRenameFiles(File[] sourceFiles,String targetFilePath,String originalSuffix,String targetSuffix){
    		File targetFile = new File(targetFilePath);
    		FileWriter fw = null;
    		FileReader fr = null;
    		if(!targetFile.isDirectory()){
    			targetFile.mkdir();
    		}
    		try {
    			for(File file:sourceFiles){
    				fw = new FileWriter(targetFilePath+"\\"+file.getName().replaceAll(originalSuffix, targetSuffix));
    				int len=0;
    				char[] cbuf=new char[(int)file.length()];
    				fr = new FileReader(file);
    				while((len=fr.read(cbuf))!=-1){
    					fw.write(cbuf,0,len);
    				}
    					
    			}
    			fw.close();
    		} catch (IOException e) {
    			e.printStackTrace();
    		}	
    	}
    	
    }