JAVA对文件和文件夹的操作代码示例

JAVA文件操作类和文件夹的操作代码实例，包括读取文本文件内容， 新建目录，多级目录创建，新建文件，有编码方式的文件创建， 删除文件，删除文件夹，删除指定文件夹下所有文件， 复制单个文件，复制整个文件夹的内容，移动文件，移动目录等。。。非常不错的哟！

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;
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 String createFolder(String folderPath) {
         String txt = folderPath;
         try {
             java.io.File myFilePath = new java.io.File(txt);
             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 String 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){
                         txts = createFolder(txts+txt);
                     }else{
                         txts = 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[1444];
                 while((byteread = inStream.read(buffer)) != -1){
                     bytesum += byteread; //字节数 文件大小
                     System.out.println(bytesum);
                     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;
     }
}