JAVA操作文件总结

 package com.file.test; 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; /** * * @author xiaxr * */ 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:myfac */ 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; } }