JAVA文件操作工具类（读、增、删除、复制）

使用JAVA的JFinal框架

1.上传文件模型类UploadFile

 /**
  * Copyright (c) 2011-2017, James Zhan 詹波 (jfinal@126.com).
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.jfinal.upload;

 import java.io.File;

 /**
  * UploadFile.
  */
 public class UploadFile {

     private String parameterName;

     private String uploadPath;
     private String fileName;
     private String originalFileName;
     private String contentType;

     public UploadFile(String parameterName, String uploadPath, String filesystemName, String originalFileName, String contentType) {
         this.parameterName = parameterName;
         this.uploadPath = uploadPath;
         this.fileName = filesystemName;
         this.originalFileName = originalFileName;
         this.contentType = contentType;
     }

     public String getParameterName() {
         return parameterName;
     }

     public String getFileName() {
         return fileName;
     }

     public String getOriginalFileName() {
         return originalFileName;
     }

     public String getContentType() {
         return contentType;
     }

     public String getUploadPath() {
         return uploadPath;
     }

     public File getFile() {
         if (uploadPath == null || fileName == null) {
             return null;
         } else {
             return new File(uploadPath + File.separator + fileName);
         }
     }
 }

model类

2.文件操作工具类

 package eracare.util;

 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.PrintWriter;
 import java.util.StringTokenizer;
 /**
  * 文件操作工具类
  * 读、增、删除、复制
  * @author user001
  *
  */
 public class FileOperate {
     private String message;
     public FileOperate() {
     }
     /**
      * 读取文本文件内容
      * @param filePathAndName 带有完整绝对路径的文件名
      * @param encoding 文本文件打开的编码方式
      * @return 返回文本文件的内容
      */
     public String readTxt(String filePathAndName,String encoding) throws IOException{
      encoding = encoding.trim();
      StringBuffer str = new StringBuffer("");
      String st = "";
      try{
       FileInputStream fs = new FileInputStream(filePathAndName);
       InputStreamReader isr;
       if(encoding.equals("")){
        isr = new InputStreamReader(fs);
       }else{
        isr = new InputStreamReader(fs,encoding);
       }
       BufferedReader br = new BufferedReader(isr);
       try{
        String data = "";
        while((data = br.readLine())!=null){
          str.append(data+" ");
        }
       }catch(Exception e){
        str.append(e.toString());
       }
       st = str.toString();
      }catch(IOException es){
       st = "";
      }
      return st;
 }
     /**
      * 新建目录
      * @param folderPath 目录
      * @return 返回目录创建后的路径
      */
     public void createFolder(String folderPath) {
 //        String txt = folderPath;
         try {
             java.io.File myFilePath = new java.io.File(folderPath);
 //            txt = folderPath;
             if (!myFilePath.exists()) {
                 myFilePath.mkdir();
             }
         }
         catch (Exception e) {
             message = "创建目录操作出错";
         }
 //        return txt;
     }

     /**
      * 多级目录创建
      * @param folderPath 准备要在本级目录下创建新目录的目录路径 例如 c:myf
      * @param paths 无限级目录参数，各级目录以单数线区分 例如 a|b|c
      * @return 返回创建文件后的路径 例如 c:myfa c
      */
     public void createFolders(String folderPath, String paths){
         String txts = folderPath;
         try{
             String txt;
             txts = folderPath;
             StringTokenizer st = new StringTokenizer(paths,"|");
             for(int i=0; st.hasMoreTokens(); i++){
                     txt = st.nextToken().trim();
                     if(txts.lastIndexOf("/")!=-1){
                         createFolder(txts+txt);
                     }else{
                        createFolder(txts+txt+"/");
                     }
             }
        }catch(Exception e){
            message = "创建目录操作出错！";
        }
 //        return txts;
     }
     /**
      * 新建文件
      * @param filePathAndName 文本文件完整绝对路径及文件名
      * @param fileContent 文本文件内容
      * @return
      */
     public void createFile(String filePathAndName, String fileContent) {
         try {
             String filePath = filePathAndName;
             filePath = filePath.toString();
             File myFilePath = new File(filePath);
             if (!myFilePath.exists()) {
                 myFilePath.createNewFile();
             }
             FileWriter resultFile = new FileWriter(myFilePath);
             PrintWriter myFile = new PrintWriter(resultFile);
             String strContent = fileContent;
             myFile.println(strContent);
             myFile.close();
             resultFile.close();
         }
         catch (Exception e) {
             message = "创建文件操作出错";
         }
     }
     /**
      * 有编码方式的文件创建
      * @param filePathAndName 文本文件完整绝对路径及文件名
      * @param fileContent 文本文件内容
      * @param encoding 编码方式 例如 GBK 或者 UTF-8
      * @return
      */
     public void createFile(String filePathAndName, String fileContent, String encoding) {

         try {
             String filePath = filePathAndName;
             filePath = filePath.toString();
             File myFilePath = new File(filePath);
             if (!myFilePath.exists()) {
                 myFilePath.createNewFile();
             }
             PrintWriter myFile = new PrintWriter(myFilePath,encoding);
             String strContent = fileContent;
             myFile.println(strContent);
             myFile.close();
         }
         catch (Exception e) {
             message = "创建文件操作出错";
         }
     }
     /**
      * 删除文件
      * @param filePathAndName 文本文件完整绝对路径及文件名
      * @return Boolean 成功删除返回true遭遇异常返回false
      */
     public boolean delFile(String filePathAndName) {
      boolean bea = false;
         try {
             String filePath = filePathAndName;
             File myDelFile = new File(filePath);
             if(myDelFile.exists()){
              myDelFile.delete();
              bea = true;
             }else{
              bea = false;
              message = (filePathAndName+"删除文件操作出错");
             }
         }
         catch (Exception e) {
             message = e.toString();
         }
         return bea;
     }

     /**
      * 删除文件夹
      * @param folderPath 文件夹完整绝对路径
      * @return
      */
     public void delFolder(String folderPath) {
         try {
             delAllFile(folderPath); //删除完里面所有内容
             String filePath = folderPath;
             filePath = filePath.toString();
             java.io.File myFilePath = new java.io.File(filePath);
             myFilePath.delete(); //删除空文件夹
         }
         catch (Exception e) {
             message = ("删除文件夹操作出错");
         }
     }
         /**
      * 删除指定文件夹下所有文件
      * @param path 文件夹完整绝对路径
      * @return
      * @return
      */
     public boolean delAllFile(String path) {
      boolean bea = false;
         File file = new File(path);
         if (!file.exists()) {
             return bea;
         }
         if (!file.isDirectory()) {
             return bea;
         }
         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();
             }
             if (temp.isDirectory()) {
                 delAllFile(path+"/"+ tempList[i]);//先删除文件夹里面的文件
                 delFolder(path+"/"+ tempList[i]);//再删除空文件夹
                 bea = true;
             }
         }
         return bea;
     }

     /**
      * 复制单个文件
      * @param oldPathFile 准备复制的文件源
      * @param newPathFile 拷贝到新绝对路径带文件名
      * @return
      */
     public void copyFile(String oldPathFile, String newPathFile) {
         try {
             int bytesum = 0;
             int byteread = 0;
             File oldfile = new File(oldPathFile);
             if (oldfile.exists()) { //文件存在时
                 InputStream inStream = new FileInputStream(oldPathFile); //读入原文件
                 FileOutputStream fs = new FileOutputStream(newPathFile);
                 byte[] buffer = new byte[10485760];
                 while((byteread = inStream.read(buffer)) != -1){
                     bytesum += byteread; //字节数 文件大小
                     fs.write(buffer, 0, byteread);
                 }
                 inStream.close();
             }
         }catch (Exception e) {
             message = ("复制单个文件操作出错");
         }
     }
    /**
      * 复制整个文件夹的内容
      * @param oldPath 准备拷贝的目录
      * @param newPath 指定绝对路径的新目录
      * @return
      */
     public void copyFolder(String oldPath, String newPath) {
         try {
             new File(newPath).mkdirs(); //如果文件夹不存在 则建立新文件夹
             File a=new File(oldPath);
             String[] file=a.list();
             File temp=null;
             for (int i = 0; i < file.length; i++) {
                 if(oldPath.endsWith(File.separator)){
                     temp=new File(oldPath+file[i]);
                 }else{
                     temp=new File(oldPath+File.separator+file[i]);
                 }
                 if(temp.isFile()){
                     FileInputStream input = new FileInputStream(temp);
                     FileOutputStream output = new FileOutputStream(newPath + "/" +
                     (temp.getName()).toString());
                     byte[] b = new byte[1024 * 5];
                     int len;
                     while ((len = input.read(b)) != -1) {
                         output.write(b, 0, len);
                     }
                     output.flush();
                     output.close();
                     input.close();
                 }
                 if(temp.isDirectory()){//如果是子文件夹
                     copyFolder(oldPath+"/"+file[i],newPath+"/"+file[i]);
                 }
             }
         }catch (Exception e) {
             message = "复制整个文件夹内容操作出错";
         }
     }

     /**
      * 移动文件
      * @param oldPath
      * @param newPath
      * @return
      */
     public void moveFile(String oldPath, String newPath) {
         copyFile(oldPath, newPath);
         delFile(oldPath);
     }

     /**
      * 移动目录
      * @param oldPath
      * @param newPath
      * @return
      */
     public void moveFolder(String oldPath, String newPath) {
         copyFolder(oldPath, newPath);
         delFolder(oldPath);
     }
     public String getMessage(){
         return this.message;
     }
 }

FileOperate类

我写博，主要是为了记录一些自己在工作中遇到的难点、痛点。因为是完成工作后的记录，有一些代码是网上查找的具体出处忘记了。如果代码有什么问题，欢迎大家留言！