Java实现复制文件夹中指定文件

小灰灰 2022-05-30 11:40 322阅读 0赞

哥们儿现在有这样一个需求：给定一个文件夹A，要将文件夹A下所有的后缀为".jar"的文件复制到文件夹B中。

以下代码方便哥们儿之后用到时不用到处找。

package com.test;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    
    public class CopyTest {
    
    	private static final String fromPath = "C:/Users/Administrator/.m2/repository/org/springframework";
    	private static final String toPath = "C:/Users/Administrator/Desktop/jar";
    
    	public static void main(String[] args) throws Exception {
    		File fromFile = new File(fromPath);
    		filter(fromFile);
    		System.out.println("复制成功！");
    	}
    
    	/**
    	 * 筛选.jar文件
    	 * 
    	 * @param fromFile
    	 * @throws Exception
    	 */
    	private static void filter(File fromFile) throws Exception {
    		if (fromFile.isDirectory()) {
    			File[] listFiles = fromFile.listFiles();
    			for (File subFile : listFiles) {
    				filter(subFile);
    			}
    		} else {
    			String name = fromFile.getName();
    			// 判断文件后缀是否为.jar
    			int length = name.length();
    			if (".jar".equals(name.substring(length - 4))) {
    				System.out.print("正在复制" + name + "...");
    				copyFile(fromFile, new File(toPath, name));
    				System.out.println("√");
    			}
    		}
    	}
    
    	/**
    	 * 复制文件的方法
    	 * 
    	 * @param fromFile
    	 * @param toFile
    	 * @throws Exception
    	 */
    	private static void copyFile(File fromFile, File toFile) throws Exception {
    		FileInputStream is = new FileInputStream(fromFile);
    		FileOutputStream os = new FileOutputStream(toFile);
    		byte[] b = new byte[1024];
    		int temp = 0;
    		while ((temp = is.read(b)) != -1) {
    			os.write(b, 0, temp);
    		}
    		is.close();
    		os.close();
    	}
    }