FilenameFilter和FileFilter不同处,在遍历一个文件夹中,找到所有的java文件

痛定思痛。 2022-04-14 04:44 148阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 2]  
文件测试实际情况如上：  
![在这里插入图片描述][20181124162950651.png]

package cn.itcast.demo443;
    
    import java.io.File;
    import java.io.FilenameFilter;
    
    public class MyJavaFilter implements FilenameFilter {
    
    	@Override
    	public boolean accept(File dir, String name) {
    		//判断获取的是目录,直接返回true,让其继续遍历
    		if(dir.isDirectory()){
    			return true;
    		}else{
    			//endsWith区分大小写
    			//toLowerCase() 方法用于将大写字符转换为小写
    			//return dir.getName().toLowerCase().endsWith(".java");			
    			return name.endsWith(".java");			
    		}
    	}
    
    }

package cn.itcast.demo443;
    
    import java.io.File;
    
    /*
     * 遍历目录,获取
     */
    public class FileDemo {
    	public static void main(String[] args) {
    		getAllJava(new File("e:\\demo"));
    	}
    	/*
    	 * 定义方法,实现遍历指定目录
    	 * 获取目录中所有的.java文件
    	 */
    	public static void getAllJava(File dir){
    		//调用File对象方法listFiles()获取,加入过滤器
    		File[] fileArr = dir.listFiles(new MyJavaFilter());
    		for(File f : fileArr){
    			//对f路径,判断是不是文件夹
    			if(f.isDirectory()){
    				//递归进入文件夹遍历
    				getAllJava(f);
    			}else{
    				System.out.println(f);
    			}
    		}
    	}
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 3]  
调试过程：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 5]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 6]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 7]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 8]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 9]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 10]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 11]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 12]  
![在这里插入图片描述][20181124163024438.png]

package cn.itcast.demo4;
    
    import java.io.File;
    import java.io.FileFilter;
    
    public class MyJavaFilter implements FileFilter {
    
    	@Override
    	public boolean accept(File pathname) {
    		//判断获取的是目录,直接返回true,让其继续遍历
    		if(pathname.isDirectory()){
    			return true;
    		}else{
    			//endsWith区分大小写
    			//toLowerCase() 方法用于将大写字符转换为小写
    			return pathname.getName().toLowerCase().endsWith(".java");			
    		}
    	}
    
    }

package cn.itcast.demo4;
    
    import java.io.File;
    
    /*
     * 遍历目录,获取
     */
    public class FileDemo {
    	public static void main(String[] args) {
    		getAllJava(new File("e:\\demo"));
    	}
    	/*
    	 * 定义方法,实现遍历指定目录
    	 * 获取目录中所有的.java文件
    	 */
    	public static void getAllJava(File dir){
    		//调用File对象方法listFiles()获取,加入过滤器
    		File[] fileArr = dir.listFiles(new MyJavaFilter());
    		for(File f : fileArr){
    			//对f路径,判断是不是文件夹
    			if(f.isDirectory()){
    				//递归进入文件夹遍历
    				getAllJava(f);
    			}else{
    				System.out.println(f);
    			}
    		}
    	}
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 13]  
调式结果：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 14]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 15]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70]: /images/20220414/c049af0fbc5d4f26bba2a6d60558eac1.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 1]: /images/20220414/da4e7d22459348b6893a9833c91cf7d6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 2]: /images/20220414/0eabf85f387d4f68932662c55fc452aa.png
[20181124162950651.png]: /images/20220414/e9e22571cc6d4acf8170e83c84892485.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 3]: /images/20220414/e4fa026eefb44207a8a602815e6d80ec.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 4]: /images/20220414/4ec2d80367474ab9b482a9a5be87f933.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 5]: /images/20220414/f60eeb268e234c9a90f6b8e427a669de.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 6]: /images/20220414/428f64c6ea454c13aeb86406d8e2359c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 7]: /images/20220414/3a200ceb36e4471f8b016db1727f2f5b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 8]: /images/20220414/ebe6a93cd64a4f60b02f9fdf06e7e1f6.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 9]: /images/20220414/7824466c759240caa95277af442b394e.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 10]: /images/20220414/8a93c7613d3e4809a0c1f3dfe3b73e3f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 11]: /images/20220414/b195d03fdfa1422481d555987f81fb56.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 12]: /images/20220414/4d66c354f2e6443baca5730b319288ba.png
[20181124163024438.png]: /images/20220414/be9d099a76cc47799e3d5aa22a49a41b.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 13]: /images/20220414/ac0a0d22398749b4a3ec95af02fe8f82.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 14]: /images/20220414/516040d100654045bdb472018241dfbc.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MDgwNzI0Nw_size_16_color_FFFFFF_t_70 15]: /images/20220414/f9dd2f343f89446d89fd883b5a2ed623.png