Java IO(文件操作工具类)

FileOperate实现的功能：

 

    1. 返回文件夹中所有文件列表

    2. 读取文本文件内容

    3. 新建目录

    4. 新建多级目录

    5. 新建文件

    6. 有编码方式的创建文件

    7. 删除文件

    8. 删除指定文件夹下所有文件

    9. 复制单个文件

    10. 复制整个文件夹的内容

    11. 移动文件

    12. 移动目录

    13. 建立一个可以追加的bufferedwriter

    14. 得到一个bufferedreader

package com.pilelot;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;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.List;import java.util.StringTokenizer;public class FileOperate{private String message;public FileOperate(){}/** * 遍历文件夹中文件 *  * @param filepath * @return 返回file［］数组 */public File[] getFileList(String filepath){File d = null;File[] list = null;// 建立当前目录中文件的File对象try{d = new File(filepath);if (d.exists()){list = d.listFiles();}} catch (Exception ex){ex.printStackTrace();message = "遍历文件夹出错";}// 取得代表目录中所有文件的File对象数组return list;}/** * 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();if (st != null && st.length() > 1)st = st.substring(0, st.length() - 1);} 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 */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 *  * @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InputStream inStream = new FileInputStream(oldPathFile); // 读入源文件FileOutputStream fs = new FileOutputStream(newPathFile);byte[] buffer = new byte[1444];while ((byteread = inStream.read(buffer)) != -1){bytesum += byteread; // 字节 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);}/** * 建立一个可以追加的bufferedwriter *  * @param fileDir * @param fileName * @return */public BufferedWriter getWriter(String fileDir, String fileName){try{File f1 = new File(fileDir);if (!f1.exists()){f1.mkdirs();}f1 = new File(fileDir, fileName);if (!f1.exists()){f1.createNewFile();}BufferedWriter bw = new BufferedWriter(new FileWriter(f1.getPath(),true));return bw;} catch (Exception e){System.out.println(e.getLocalizedMessage());return null;}}/** * 得到一个bufferedreader *  * @param fileDir * @param fileName * @param encoding * @return */public BufferedReader getReader(String fileDir, String fileName,String encoding){try{File file = new File(fileDir, fileName);InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding);BufferedReader br = new BufferedReader(read);return br;} catch (FileNotFoundException ex){ex.printStackTrace();return null;} catch (IOException e){e.printStackTrace();return null;}}public String getMessage(){return this.message;}public static void main(String[] args){FileOperate fo = new FileOperate();File[] files = fo.getFileList("d:/AndyChan/");for (int i = 0; i < files.length; i++){System.out.println(files[i].getName());}}}