import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.Date;/** * 功能：该类用于操作文件和文件夹 * */public class FileUtil { /** * * @param targetFile 被操作的文件 * @param keValue @param keValue 键值对，键代表要被替换掉的文件中的文本，值代表要替换成什么值 */ public static void replaceText(File targetFile,Map keValue){ if(targetFile==null||keValue==null||keValue.entrySet().size()==0) return; StringBuffer contentBuffer=readFileContent(targetFile); replaceAll(contentBuffer, keValue); writeContentToFile(contentBuffer.toString(),targetFile); } /** * @param keValue @param keValue 键值对，键代表要被替换掉的的文本，值代表要替换成什么值 */ public static void replaceAll(StringBuffer targetBuffer,Map keValue){ if(targetBuffer==null||targetBuffer.length()==0) return; Iterator iterator=keValue.entrySet().iterator(); while(iterator.hasNext()){ Map.Entry entry=(Map.Entry)iterator.next(); String targetTex=(String)entry.getKey(); String replaceText=(String)entry.getValue(); if(targetTex.equals(replaceText)) continue;//替换文本和被替换文本相同，无需替换 if(targetTex!=null&&targetTex.length()!=0){ int start=targetBuffer.indexOf(targetTex); while(start!=-1){ targetBuffer.replace(start, start+targetTex.length(), replaceText); start=targetBuffer.indexOf(targetTex,start+replaceText.length());//查找下一处 } } } } /** * * @param targetBuffer * @param keValue * @return false 没有可替换的元素，true 替换成功 */ public static boolean replaceFirstMatch(StringBuffer targetBuffer,String targetTex,String replaceText,int begin,int end){ if(targetBuffer==null||targetBuffer.length()==0) return false; if(targetTex.equals(replaceText)) return false;//替换文本和被替换文本相同，无需替换 if(targetTex!=null&&targetTex.length()!=0){ targetBuffer.replace(begin,end, replaceText); return true; } return false; } /** * * @param targetFile 目标文件 * @return 读取的文件内容 */ public static StringBuffer readFileContent(File targetFile){ StringBuffer contentBuffer = new StringBuffer(); String line = null; BufferedReader reader = null; try { //Linux系统 reader = new BufferedReader(new InputStreamReader(new FileInputStream(targetFile),"UTF-8")); //Windows系统 //reader = new BufferedReader(new InputStreamReader(new FileInputStream(targetFile),"gb2312")); //reader = new BufferedReader(new FileReader(targetFile)); while ((line = reader.readLine()) != null) { contentBuffer.append(line + "\n"); } } catch (FileNotFoundException e) { e.printStackTrace(); throw new RuntimeException("没有找到文件，请检查文件路径是否正确！"); } catch (IOException e) { e.printStackTrace(); throw new RuntimeException("读取文件的过程中发生了IOException！"); }finally{ try { if(reader!=null) reader.close(); } catch (IOException e) { e.printStackTrace(); } } return contentBuffer; } public static void writeContentToFile(String content,File targetFile){ BufferedWriter writer = null; try { //writer = new BufferedWriter(new FileWriter(targetFile)); //Linux系统 OutputStreamWriter write = new OutputStreamWriter(new FileOutputStream(targetFile),"UTF-8"); //Windows系统 //OutputStreamWriter write = new OutputStreamWriter(new FileOutputStream(targetFile),"gb2312"); writer=new BufferedWriter(write); writer.write(content); writer.close(); } catch (IOException e) { e.printStackTrace(); throw new RuntimeException("写文件的过程中发生了IOException！"); }finally{ try { if(writer!=null) writer.close(); } catch (IOException e) { e.printStackTrace(); } } } /** * 将源文件的数据写入到目标文件中， * 不会检查源文件是否存在， * 若目标文件存在则直接写入， * 否则创建目标文件后再进行写入。 * @param srcPath * @param desPath */ private static void copyFile(String srcPath,String desPath){ try { FileInputStream in = new FileInputStream(srcPath); FileOutputStream out = new FileOutputStream(desPath); byte[] bt = new byte[1024]; int count; while ((count = in.read(bt)) > 0) { out.write(bt, 0, count); } in.close(); out.close(); } catch (IOException ex) { ex.printStackTrace(); } } /** * 复制文件，若文件存在则替换该文件。 * @param srcPath * @param desPath * @throws Exception */ public static void copyAndReplaceFile(String srcPath,String desPath) throws Exception{ srcPath = separatorReplace(srcPath); desPath = separatorReplace(desPath); File srcFile = new File(srcPath); if(!srcFile.isFile()){ throw new Exception("source file not found!"); } copyFile(srcPath,desPath); } /** * 复制文件，若文件已存在则不进行替换。 * @param srcPath * @param desPath * @throws Exception */ public static void copyAndNotReplaceFile(String srcPath,String desPath) throws Exception{ srcPath = separatorReplace(srcPath); desPath = separatorReplace(desPath); File srcFile = new File(srcPath); File desFile = new File(desPath); if(!srcFile.isFile()){ throw new Exception("source file not found!"); } if(desFile.isFile()){ return; } copyFile(srcPath,desPath); } /** * 移动文件，若文件存在则替换该文件。 * @param srcPath * @param desPath * @throws Exception */ public static void moveAndReplaceFile(String srcPath,String desPath) throws Exception{ srcPath = separatorReplace(srcPath); desPath = separatorReplace(desPath); copyAndReplaceFile(srcPath,desPath); deleteFile(srcPath); } /** * 移动文件，若文件存在则不进行替换。 * @param srcPath * @param desPath * @throws Exception */ public static void moveAndNotReplaceFile(String srcPath,String desPath) throws Exception{ srcPath = separatorReplace(srcPath); desPath = separatorReplace(desPath); copyAndNotReplaceFile(srcPath,desPath); deleteFile(srcPath); } /** * 复制并合并文件夹， * 不会替换目标文件夹中已经存在的文件或文件夹。 * @param srcPath * @param desPath * @throws Exception */ public static void copyAndMergerFolder(String srcPath,String desPath) throws Exception{ srcPath = separatorReplace(srcPath); desPath = separatorReplace(desPath); File folder = getFolder(srcPath); createFolder(desPath); File[] files = folder.listFiles(); for(File file:files){ String src = file.getAbsolutePath(); String des = desPath+File.separator+file.getName(); if(file.isFile()){ copyAndNotReplaceFile(src,des); }else if(file.isDirectory()){ copyAndMergerFolder(src,des); } } } /** * 复制并替换文件夹， * 将目标文件夹完全替换成源文件夹， * 目标文件夹原有的资料会丢失。 * @param srcPath * @param desPath * @throws Exception */ public static void copyAndReplaceFolder(String srcPath,String desPath) throws Exception{ srcPath = separatorReplace(srcPath); desPath = separatorReplace(desPath); File folder = getFolder(srcPath); createNewFolder(desPath); File[] files = folder.listFiles(); for(File file:files){ String src = file.getAbsolutePath(); String des = desPath+File.separator+file.getName(); if(file.isFile()){ copyAndReplaceFile(src,des); }else if(file.isDirectory()){ copyAndReplaceFolder(src,des); } } } /** * 合并文件夹后，将源文件夹删除。 * @param srcPath * @param desPath * @throws Exception */ public static void moveAndMergerFolder(String srcPath,String desPath) throws Exception{ srcPath = separatorReplace(srcPath); desPath = separatorReplace(desPath); copyAndMergerFolder(srcPath,desPath); deleteFolder(srcPath); } /** * 替换文件夹后，将源文件夹删除。 * @param srcPath * @param desPath * @throws Exception */ public static void moveAndReplaceFolder(String srcPath,String desPath) throws Exception{ srcPath = separatorReplace(srcPath); desPath = separatorReplace(desPath); copyAndReplaceFolder(srcPath,desPath); deleteFolder(srcPath); } /** * 创建文件夹，如果文件夹存在则不进行创建。 * @param path * @throws Exception */ public static void createFolder(String path) throws Exception{ path = separatorReplace(path); File folder = new File(path); if(folder.isDirectory()){ return; }else if(folder.isFile()){ deleteFile(path); } folder.mkdirs(); } /** * 创建一个新的文件夹，如果文件夹存在，则删除后再创建。 * @param path * @throws Exception */ public static void createNewFolder(String path) throws Exception{ path = separatorReplace(path); File folder = new File(path); if(folder.isDirectory()){ deleteFolder(path); }else if(folder.isFile()){ deleteFile(path); } folder.mkdirs(); } /** * 创建一个文件，如果文件存在则不进行创建。 * @param path * @throws Exception */ public static File createFile(String path) throws Exception{ path = separatorReplace(path); File file = new File(path); if(file.isFile()){ return file; }else if(file.isDirectory()){ deleteFolder(path); } return createFile(file); } /** * 创建一个新文件，如果存在同名的文件或文件夹将会删除该文件或文件夹， * 如果父目录不存在则创建父目录。 * @param path * @throws Exception */ public static File createNewFile(String path) throws Exception{ path = separatorReplace(path); File file = new File(path); if(file.isFile()){ deleteFile(path); }else if(file.isDirectory()){ deleteFolder(path); } return createFile(file); } /** * 分隔符替换 * window下测试通过 * @param path * @return */ public static String separatorReplace(String path){ return path.replace("\\","/"); } /** * 创建文件及其父目录。 * @param file * @throws Exception */ public static File createFile(File file) throws Exception{ createParentFolder(file); if(!file.createNewFile()) { throw new Exception("create file failure!"); } return file; } /** * 创建父目录 * @param file * @throws Exception */ private static void createParentFolder(File file) throws Exception{ if(!file.getParentFile().exists()) { if(!file.getParentFile().mkdirs()) { throw new Exception("create parent directory failure!"); } } } /** * 根据文件路径删除文件，如果路径指向的文件不存在或删除失败则抛出异常。 * @param path * @return * @throws Exception */ public static void deleteFile(String path) throws Exception { path = separatorReplace(path); File file = getFile(path); if(!file.delete()){ throw new Exception("delete file failure"); } } /** * 删除指定目录中指定前缀和后缀的文件。 * @param dir * @param prefix * @param suffix * @throws Exception */ public static void deleteFile(String dir,String prefix,String suffix) throws Exception{ dir = separatorReplace(dir); File directory = getFolder(dir); File[] files = directory.listFiles(); for(File file:files){ if(file.isFile()){ String fileName = file.getName(); if(fileName.startsWith(prefix)&&fileName.endsWith(suffix)){ deleteFile(file.getAbsolutePath()); } } } } /** * 根据路径删除文件夹，如果路径指向的目录不存在则抛出异常， * 若存在则先遍历删除子项目后再删除文件夹本身。 * @param path * @throws Exception */ public static void deleteFolder(String path) throws Exception { path = separatorReplace(path); File folder = getFolder(path); File[] files = folder.listFiles(); for(File file:files) { if(file.isDirectory()){ deleteFolder(file.getAbsolutePath()); }else if(file.isFile()){ deleteFile(file.getAbsolutePath()); } } folder.delete(); } /** * 查找目标文件夹下的目标文件 * @param dir * @param fileName * @return * @throws FileNotFoundException */ public static File searchFile(String dir,String fileName) throws FileNotFoundException{ dir = separatorReplace(dir); File f = null; File folder = getFolder(dir); File[] files = folder.listFiles(); for(File file:files) { if(file.isDirectory()){ f = searchFile(file.getAbsolutePath(),fileName); if(f!=null){ break; } }else if(file.isFile()){ if(file.getName().equals(fileName)){ f = file; break; } } } return f; } /** * 获得文件类型。 * @param path：文件路径 * @return * @throws FileNotFoundException */ public static String getFileType(String path) throws FileNotFoundException { path = separatorReplace(path); File file = getFile(path); String fileName = file.getName(); String[] strs = fileName.split("\\."); if(strs.length<2){ return "unknownType"; } return strs[strs.length-1]; } /** * 根据文件路径，获得该路径指向的文件的大小。 * @param path * @return * @throws FileNotFoundException */ public static long getFileSize(String path) throws FileNotFoundException{ path = separatorReplace(path); File file = getFile(path); return file.length(); } /** * 根据文件夹路径，获得该路径指向的文件夹的大小。 * 遍历该文件夹及其子目录的文件，将这些文件的大小进行累加，得出的就是文件夹的大小。 * @param path * @return * @throws FileNotFoundException */ public static long getFolderSize(String path) throws FileNotFoundException{ path = separatorReplace(path); long size = 0; File folder = getFolder(path); File[] files = folder.listFiles(); for(File file:files){ if(file.isDirectory()){ size += getFolderSize(file.getAbsolutePath()); }else if(file.isFile()){ size += file.length(); } } return size; } /** * 通过路径获得文件， * 若不存在则抛异常， * 若存在则返回该文件。 * @param path * @return * @throws FileNotFoundException */ public static File getFile(String path) throws FileNotFoundException{ path = separatorReplace(path); File file = new File(path); if(!file.isFile()){ throw new FileNotFoundException("file not found!"); } return file; } /** * 通过路径获得文件夹， * 若不存在则抛异常， * 若存在则返回该文件夹。 * @param path * @return * @throws FileNotFoundException */ public static File getFolder(String path) throws FileNotFoundException{ path = separatorReplace(path); File folder = new File(path); if(!folder.isDirectory()){ throw new FileNotFoundException("folder not found!"); } return folder; } /** * 获得文件最后更改时间。 * @param path * @return * @throws FileNotFoundException */ public static Date getFileLastModified(String path) throws FileNotFoundException{ path = separatorReplace(path); File file = getFile(path); return new Date(file.lastModified()); } /** * 获得文件夹最后更改时间。 * @param path * @return * @throws FileNotFoundException */ public static Date getFolderLastModified(String path) throws FileNotFoundException{ path = separatorReplace(path); File folder = getFolder(path); return new Date(folder.lastModified()); } public static void main(String[]args){ File targetFile=new File("d:/11.xml");// Map keyValue=new HashMap();// keyValue.put("aaa", "bbb");// replaceText(targetFile, keyValue); writeContentToFile("123",targetFile); }
}
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