Java开发 之文件操作

一行一行读取、写入文件内容

File readFile = new File("E:\\应用IP.txt");
File writeFile = new File("E:\\应用IPTmp.txt");
try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(readFile), "UTF-8"));
     BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(writeFile), "UTF-8"))){
    String line = "";
    while ((line = reader.readLine()) != null) {
        writer.write(line);
        writer.newLine();
    }
}catch (Exception e){

}

获取文件夹下的所有文件File对象

public static List<File> getFiles(String path){
    File root = new File(path);
    List<File> files = new ArrayList<>();
    if(!root.isDirectory()){
        files.add(root);
    }else{
        File[] subFiles = root.listFiles();
        for(File f : subFiles){
            files.addAll(getFiles(f.getAbsolutePath()));
        }
    }
    return files;
}