Java 簡單IO文件處理
package com.java.file;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
/**
* operate file
* @author Administrator
*
*/
public class OperateFile {
/**
* create this file
* @param filePath
* @throws IOException
*/
public static void createFile(String filePath) throws IOException{
int lastPoint = filePath.lastIndexOf("\\");
if(lastPoint==-1){
throw new IOException("this filePath is not true !!");
}
String folderPath = filePath.substring(0, lastPoint);
File folderFile = new File(folderPath);
if(folderFile.exists()){
File newFile = new File(filePath);
if(!newFile.exists()){
newFile.createNewFile();
}else{
throw new IOException("the file is exists !!");
}
}else{
throw new IOException("application cann't find the folder!!");
}
System.out.println("execute createFile(filePath) success！！");
}
/**
* delete this file
* @param filePath
* @throws IOException
*/
public static void deleteFile(String filePath) throws IOException{
String folderPath = filePath.substring(0, filePath.lastIndexOf("\\"));
File folderFile = new File(folderPath);
if(folderFile.exists()){
File file = new File(filePath);
if(file.exists()){
file.delete();
}else{
throw new IOException("the file is not exists !!");
}
}else{
throw new IOException("application cann't find the folder!!");
}
System.out.println("execute deleteFile(filePath) success！！");
}
/**
* copy file to target file
* @param srcPath
* @param targetPath
* @throws IOException
*/
public static void copyFile(String srcPath, String targetPath) throws IOException{
File srcFile = new File(srcPath);
if(srcFile.exists()){
//create fileInputDtream read file
FileInputStream fileInputStream = new FileInputStream(srcFile);
File targetFile = new File(targetPath);
if(!targetFile.exists()){
createFile(targetPath);
}
//create fileOutputStream write file
FileOutputStream fileOutputStream = new FileOutputStream(targetFile);
int content = fileInputStream.read();
while(content!=-1){
fileOutputStream.write(content);
content = fileInputStream.read();
}
fileOutputStream.flush();
fileOutputStream.close();
fileInputStream.close();
System.out.println("execute copyFile(srcPath, targetPath) success！！");
}else {
throw new IOException("the src file is not exists!!");
}
}
/**
* copy file to target file by buffered
* @param srcPath
* @param targetPath
* @throws IOException
*/
public static void copyFileByBuffered(String srcPath, String targetPath) throws IOException{
File srcFile = new File(srcPath);
if(srcFile.exists()){
//create fileInputDtream read file
FileInputStream fileInputStream = new FileInputStream(srcFile);
//create bufferedInputStream
BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
File targetFile = new File(targetPath);
if(!targetFile.exists()){
createFile(targetPath);
}
//create fileOutputStream write file
FileOutputStream fileOutputStream = new FileOutputStream(targetFile);
//create bufferedOutputStream
BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
int content = bufferedInputStream.read();
while(content!=-1){
bufferedOutputStream.write(content);
content = bufferedInputStream.read();
}
fileOutputStream.flush();
bufferedOutputStream.close();
bufferedInputStream.close();
fileOutputStream.close();
fileInputStream.close();
System.out.println("execute copyFileByBuffered(srcPath, targetPath) success！！");
}else {
throw new IOException("the src file is not exists!!");
}
}
/**
* copy file to target file by buffered ,then delete the file
* @param srcPath
* @param targetPath
* @throws IOException
*/
public static void cutFileByBuffered(String srcPath, String targetPath) throws IOException{
copyFileByBuffered(srcPath, targetPath);
deleteFile(srcPath);
System.out.println("execute cutFileByBuffered(srcPath, targetPath) success！！");
}
/**
* create this folder
* @param folderPath
* @throws IOException
*/
public static void createFolder(String folderPath) throws IOException{
File folderFile = new File(folderPath);
if(!folderFile.exists()){
//folderFile.mkdir();
//mkdirs 會創建指定路徑的多個不存在文件夾，但是mkdir只會創建最底層的文件夾，如果其父目錄不存在 則什麼都不做
folderFile.mkdirs();
}else{
throw new IOException("this folder is exists!!!");
}
System.out.println("execute createFolder(folderPath) success！！");
}
/**
* copy folder to target folder
* @param srcFolderPath
* @param targetFolderPath
* @throws IOException
*/
public static void copyFolder(String srcFolderPath, String targetFolderPath) throws IOException{
File srcFolder = new File(srcFolderPath);
if(srcFolder.exists()){
createFolder(targetFolderPath);
String [] folderStrs = srcFolder.list();
for (int i = 0; i < folderStrs.length; i++) {
String subSrcFolderPath = srcFolderPath + File.separator + folderStrs[i];
File subSrcFolder = new File(subSrcFolderPath);
String subTargetFilePath = targetFolderPath + File.separator + folderStrs[i];
if(subSrcFolder.isDirectory()){
copyFolder(subSrcFolderPath, subTargetFilePath);
}else{
copyFileByBuffered(subSrcFolderPath, subTargetFilePath);
}
}
}else{
throw new IOException("this src folder is not exists!!!");
}
System.out.println("execute copyFolder(srcFolderPath, String targetFolderPath) success！！");
}
/**
* delete this folder
* @param folderPath
* @throws IOException
*/
public static void deleteFolder(String folderPath) throws IOException{
File folderFolder = new File(folderPath);
if(folderFolder.exists()){
String [] folderStrs = folderFolder.list();
for (int i = 0; i < folderStrs.length; i++) {
String subFolderPath = folderPath + File.separator + folderStrs[i];
File subFolder = new File(subFolderPath);
if(subFolder.isDirectory()){
deleteFolder(subFolderPath);
}else{
subFolder.delete();
}
}
folderFolder.delete();
}else{
throw new IOException("this src folder is not exists!!!");
}
System.out.println("execute deleteFolder(folderPath) success！！");
}
public static void main(String[] args) {
try {
//OperateFile.deleteFile("D:\\a");
//OperateFile.copyFile("D:\\a1.txt", "D:\\b.txt");
//OperateFile.copyFileByBuffered("D:\\a.txt", "D:\\b.txt");
//OperateFile.cutFileByBuffered("D:\\a.txt", "D:\\b.txt");
//OperateFile.createFolder("D:\\aaa.txt");
//OperateFile.copyFolder("d:\\a","d:\\newa");
OperateFile.deleteFolder("d:\\newa");
} catch (Exception e) {
e.printStackTrace();
}
}
}
