import java.io.BufferedReader;import java.io.File;import java.io.FileReader;import java.io.IOException;import java.nio.file.Files;import java.nio.file.Paths;import java.util.ArrayList;import java.util.List;public class ClearFile  {      static String folder = "E:\\NewServer\\Wechat\\JOINT_CARE\\Source";    List
     
       filelist = new ArrayList
      
       ();    List
       
         contentlist = new ArrayList
        
         ();    public static void main(String[] args) throws IOException       {              ClearFile clear = new ClearFile();        clear.clear(folder);            }        public void clear(String folder) throws IOException{        getAllFilePaths(new File(folder));        getContentFiles(new File(folder));                        for(FilePojo file : contentlist){            search(file.getPath());        }                System.out.println("******************************************删除了以下文件************************************");         for(FilePojo file : filelist){            if(!file.isFind()) {                                System.out.println(file.getPath());                new File(file.getPath()).delete();            }        }    }         private void getAllFilePaths(File filePath){        File[] files = filePath.listFiles();                   for(File file : files){            if(file.isDirectory()){                getAllFilePaths(file);            }else{                String filename = file.getName();                                if(filename.contains(".jpg")                         || filename.contains(".png")                        || filename.contains(".gif")                        || filename.contains(".js")                        || filename.contains(".css")) {                    FilePojo pojo = new FilePojo();                    pojo.setName(file.getName());                    pojo.setPath(file.getPath());                                    filelist.add(pojo);                }            }        }    }        private void getContentFiles(File filePath){        File[] files = filePath.listFiles();                   for(File file : files){            if(file.isDirectory()){                getContentFiles(file);            }else{                String filename = file.getName();                                if(filename.contains(".html")                         || filename.contains(".ftl")                         || filename.contains(".css")                        || filename.contains(".js")                        || filename.contains(".java")) {                    FilePojo pojo = new FilePojo();                    pojo.setName(file.getName());                    pojo.setPath(file.getPath());                                    contentlist.add(pojo);                }            }        }    }        public void search(String filename) throws IOException       {                  BufferedReader br = new BufferedReader(new FileReader(filename));         for(String line; (line = br.readLine()) != null; ) {                            for(FilePojo file : filelist){                if (line.contains(file.getName())){                    file.setFind(true);                }            }        }                br.close();    }         private class FilePojo{        private String name;        private String path;        private boolean find;        public String getName() {            return name;        }        public void setName(String name) {            this.name = name;        }        public String getPath() {            return path;        }        public void setPath(String path) {            this.path = path;        }        public boolean isFind() {            return find;        }        public void setFind(boolean find) {            this.find = find;        }    }}
        
       
      
     

 有个小问题：如果文件名为01.jpg, 代码中引用了xx01.jpg，则01.jpg会被认为是需要的文件。