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);
        }
    }
}

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;
    }
}

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！