java 常用文件管理
程序员文章站
2022-03-02 17:17:01
...
package file; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileWriter; import java.io.IOException; import java.io.InputStreamReader; import java.io.RandomAccessFile; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.List; /** * File Operation Class * * @author liangyongbiao * */ public class FileOperate { /** * Read Form File * @throws IOException */ public static List<String> ReadFromFile(String strfile) throws IOException { CheckFileExit(strfile); File file = new File(strfile); List<String> list=new ArrayList<String>(); try { InputStreamReader read = new InputStreamReader(new FileInputStream( file), "GBK"); BufferedReader bufferedReader = new BufferedReader(read); String lineTxt = null; while ((lineTxt = bufferedReader.readLine()) != null) { list.add(lineTxt); } read.close(); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return list; } public static void main(String[] args) throws IOException { WriteToFileWithOneLine("D:/file/fileoper.txt", "附近萨芬的克里斯"); // System.out.println(CheckFileNotNull("D:/file/fileoper.txt")); } /** * Write To File * @throws IOException */ public static void WriteToFile(String strfile,String str) throws IOException { File file=new File(strfile); CheckFileExit(strfile); RandomAccessFile randomAccessFile=null; try{ randomAccessFile=new RandomAccessFile(file, "rw"); long fileLength=randomAccessFile.length(); randomAccessFile.seek(fileLength); randomAccessFile.writeBytes(str); //也可以使用下面的方式追加 // FileWriter writer = new FileWriter(file, true); // writer.write(str); // writer.close(); }catch(IOException e){ e.printStackTrace(); } finally{ if(randomAccessFile!=null){ try{ randomAccessFile.close(); }catch(IOException e){ e.printStackTrace(); } } } } /** * Check File is exit or not */ public static void CheckFileExit(String strfile) { File file = new File(strfile); if (!file.exists()) { try { file.createNewFile(); } catch (IOException e) { e.printStackTrace(); } } } /** * Clean File */ public static void CleanFile(String strfile) { CheckFileExit(strfile); try { FileWriter fileWriter = new FileWriter(strfile); fileWriter.write(""); fileWriter.flush(); fileWriter.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * @author liangyongbiao * Copy A File Content */ public File CopyFileToFile(File sourceFile, File ReturnFile) { return ReturnFile; } /** * @author liangyongbiao * Append To File end */ public File AppendToFileEnd(String strfile) { CheckFileExit(strfile); File file = new File(strfile); return file; } /** * Check File Content is null or not * @throws IOException */ @SuppressWarnings("resource") public static Boolean CheckFileNotNull(String strfile) throws IOException { Boolean flag = false; File file=new File(strfile); CheckFileExit(strfile); FileInputStream fileInputStream; try { fileInputStream = new FileInputStream(file); int size=fileInputStream.available(); if(size==0){ System.out.println("文件为空!!"); }else{ flag=true; } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return flag; } /** * Radrom Write To File */ public File randomWriteToFile(String strfile, String str) { File file = new File(strfile); return file; } /** * One Line One Read */ public static File WriteToFileWithOneLine(String strfile,String str){ File file=new File(strfile); CheckFileExit(strfile); FileWriter writer; try { writer = new FileWriter(file, true); str=str+"\n"; writer.write(str); writer.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return file; } }
上一篇: Hibernate自动创建表
下一篇: java 格式化输出当前时间