java中遍历文件，再将txt文件聚合到一起

灰太狼 2023-07-13 13:36 9阅读 0赞

import java.io.*;
    import java.util.ArrayList;
    
    /** * 将oldPath这个目录下的所有txt文件遍历读取 * 然后全部放到newFile这个文件里 * */
    public class GetSome { 
        ArrayList<String> listPath = new ArrayList<>();
        ArrayList<String> listFile = new ArrayList<>();
    
        public static void main(String[] args) throws IOException { 
            GetSome getSome = new GetSome();
    
            String oldPath = "C:\\Users\\Desktop\\agent";
            String newFile = "C:\\Users\\Desktop\\1.txt";
    
            //得到oldpath目录下的所有txt文件目录
            getSome.copyPath(oldPath,getSome);
            //读取所有txt文件里的内容
            getSome.readFilePath(getSome.listPath,getSome);
            //将txt文件里的内容写入newFile文件
            getSome.writeFile(getSome.listFile,newFile);
        }
    
        public void writeFile(ArrayList<String> list,String path) throws IOException { 
            File file = new File(path);
            if (!file.exists()){ 
                file.createNewFile();
            }
    
            BufferedWriter bw = new BufferedWriter(new FileWriter(path));
            for (String str:list){ 
                bw.write(str + "\n");
                bw.flush();
            }
            bw.close();
        }
    
        public void readFilePath(ArrayList<String> listPath,GetSome getSome) throws IOException { 
            for (String str:listPath){ 
                getSome.readfile(str,getSome);
            }
        }
    	
        public void readfile(String path,GetSome getSome) throws IOException { 
            if (!path.contains(".txt")){ 
                return;
            }
            BufferedReader br = new BufferedReader(new FileReader(path));
            String str = br.readLine();
            while (str != null){ 
                getSome.listFile.add(str);
                str = br.readLine();
            }
        }
    
    	//传入目录，进行遍历
        public void copyPath(String path,GetSome getSome) { 
    
            File file = new File(path);
            if (file.exists()) { 
                File[] files = file.listFiles();
                if (null == files || files.length == 0) { 
                    System.out.println("文件夹是空的!");
                    return;
                } else { 
                    for (File file2 : files) { 
                        if (file2.isDirectory()) { 
                            copyPath(file2.getAbsolutePath(),getSome);
                        } else { 
                            getSome.listPath.add(file2.getAbsolutePath());
    // System.out.println("文件:" + file2.getAbsolutePath());
                        }
                    }
                }
            } else { 
                System.out.println("文件不存在!");
            }
        }
    
    }