FileUrl

Posted 2021-02-02 tanning

package com.rscode.credits.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class FileUtil {
    /**
     * 根据输入流保存文件
     * @param ins 输入流
     * @param fileName 文件url
     * @throws IOException 使用者自己处理异常
     */
    public static void saveFileByInputStream(InputStream ins,String fileName) throws IOException{
        FileOutputStream fos = new FileOutputStream(fileName);
        byte[] b = new byte[1024];
        while((ins.read(b)) != -1){
            fos.write(b);
        }
        ins.close();
        fos.close();
    }
    /**
     * 删除文件夹下所有文件
     * @param path
     * @return
     */
    public static boolean delAllFile(String path) {
           boolean flag = false;
           File file = new File(path);
           if (!file.exists()) {
             return flag;
           }
           if (!file.isDirectory()) {
             return flag;
           }
           String[] tempList = file.list();
           File temp = null;
           for (int i = 0; i < tempList.length; i++) {
              if (path.endsWith(File.separator)) {
                 temp = new File(path + tempList[i]);
              } else {
                  temp = new File(path + File.separator + tempList[i]);
              }
              if (temp.isFile()) {
                 temp.delete();
                
              }
             
           }
           return flag;
         
    }
    /**
     * 读取文本格式文件,按行读取
     * @param filePath
     */
    public static List<String> readTxt(String filePath) {
         List<String> stringList = new ArrayList<>();
          try {
            File file = new File(filePath);
            if(file.isFile() && file.exists()) {
              InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "GBK");
              BufferedReader br = new BufferedReader(isr);
              String lineTxt = null;
              while ((lineTxt = br.readLine()) != null) {
                  stringList.add(lineTxt);
              }
              br.close();
            } else {
              System.out.println("文件不存在!");
            }
          } catch (Exception e) {
            System.out.println("文件读取错误!");
          }
        return stringList;
         
    }
    /**
     * 获取文件下所有文件
     * @param path
     */
     public static  List<File> getFiles(String path) {
            File file = new File(path);
            List<File> fileList = new ArrayList<>();
            // 如果这个路径是文件夹
            if (file.isDirectory()) {
                // 获取路径下的所有文件
                File[] files = file.listFiles();
                for (int i = 0; i < files.length; i++) {
                    System.out.println(files[i].getName());
                    fileList.add(files[i]);                  
               }
            }
            return fileList;
        }
    public static void saveFileByFile(){
        
        
    }
}