javaIO读和写和创建文件夹的基础简单操作

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package com.zuoye16;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;public class FileUtil {public static final String PATH=System.getProperty("user.dir");public void cj(String path) {File file=new File(PATH+path);int index=path.indexOf(".");if(index==-1) {if(!file.exists()) {file.mkdirs();}}else {int index2=path.lastIndexOf("/");String string=path.substring(0, index2);if(!file.exists()) { File file2=new File(PATH+string); file2.mkdirs();}}try {file.createNewFile();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

public class TestFileUtil {public static void main(String[] args) {
         //读和写的初始化       FileReader fileReader=null;       FileWriter fileWriter=null;       try {    
                  //读和写的初始化fileReader=new FileReader(file);fileUtil.cj("/src/com/lanou/day18/Text.txt");fileWriter=new FileWriter(fileName);//将读出来的数据写入int lenght=0;char[] context=new char[1024];while((lenght=fileReader.read(context))!=-1) {fileWriter.write(context,0,lenght);}
              //完成后刷新   fileWriter.flush();} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally {if(fileWriter!=null) {try {
                                  //关闭写入流fileWriter.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}       }}

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