java文件操作
复制代码 代码如下:
package com.b510;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.PrintWriter;
public class OperateFiles {
public static void main(String[] args) {
OperateFiles operateFiles = new OperateFiles();
//新建一个文件夹
operateFiles.newFolder("c:/hongten");
//新建一个文件，同时向里面写入内容
operateFiles.newFile("c:/hongten/Hello.txt", "hello,i'm Hongten.你好");
//删除一个文件
operateFiles.deleteFile("c:/hongten/Hello.txt");
//删除一个文件夹
operateFiles.deleteFolder("c:/hongten");
//复制文件夹
operateFiles.copyFolder("c:/hongten", "e:/hongten");
//提取文件的扩展名
String expandedName=operateFiles.getExpandedName("c:/hongten/Hello.txt");
System.out.println(expandedName);
//提取文件的路径
System.out.println(operateFiles.getFilePath("c:/hongten/Hello.txt"));
}
public String getExpandedName(String filePath){
return filePath.substring(filePath.lastIndexOf(".")+1);
}
public String getFilePath(String file){
return file.substring(0,file.lastIndexOf("/"));
}
public void newFolder(String folderPath) {
try {
File myFolderPath = new File(folderPath.toString());
if (!myFolderPath.exists()) {
myFolderPath.mkdir();
}
} catch (Exception e) {
System.out.println("新建目录操作出错");
e.printStackTrace();
}
}
public void newFile(String filePath) {
try {
File myFilePathFile = new File(filePath.toString());
if (!myFilePathFile.exists()) {
myFilePathFile.createNewFile();
}
} catch (Exception e) {
System.out.println("新文件创建失败");
e.printStackTrace();
}
}
public void newFile(String filePath, String fileContent) {
try {
newFile(filePath);
FileWriter resultFile = new FileWriter(filePath);
PrintWriter myFile = new PrintWriter(resultFile);
myFile.println(fileContent);
resultFile.close();
} catch (Exception e) {
System.out.println("新建文件操作出错");
e.printStackTrace();
}
}
public void deleteFile(String filePath) {
try {
File preDelFile = new File(filePath);
if (preDelFile.exists()) {
preDelFile.delete();
} else {
System.out.println(filePath + "不存在！");
}
} catch (Exception e) {
System.out.println("删除文件操作出错");
e.printStackTrace();
}
}
public void deleteFolder(String folderPath) {
try {
delAllFiles(folderPath);
File preDelFoder = new File(folderPath);
if (preDelFoder.exists()) {
preDelFoder.delete();
} else {
System.out.println(folderPath + "不存在！");
}
} catch (Exception e) {
System.out.println("删除文件操作出错");
e.printStackTrace();
}
}
public void delAllFiles(String folderPath) {
File file = new File(folderPath);
if (!file.exists()) {
return;
}
if (!file.isDirectory()) {
return;
}
String[] tempList = file.list();
File temp = null;
for (int i = 0; i < tempList.length; i++) {
if (folderPath.endsWith(File.separator)) {
temp = new File(folderPath + tempList[i]);
} else {
temp = new File(folderPath + File.separator + tempList[i]);
}
if (temp.isFile()) {
temp.delete();
}
if (temp.isDirectory()) {
delAllFiles(folderPath + "/" + tempList[i]);// 先删除文件夹里面的文件
deleteFolder(folderPath + "/" + tempList[i]);// 再删除空文件夹
}
}
}
public void copyFile(String oldPath, String newPath) {
try {
int bytesum = 0;
int byteread = 0;
File oldfile = new File(oldPath);
if (oldfile.exists()) { // 文件存在时
InputStream inStream = new FileInputStream(oldPath); // 读入原文件
FileOutputStream fs = new FileOutputStream(newPath);
byte[] buffer = new byte[1444];
// int length = 0;
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread; // 字节数 文件大小
fs.write(buffer, 0, byteread);
}
inStream.close();
}
} catch (Exception e) {
System.out.println("复制单个文件操作出错");
e.printStackTrace();
}
}
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) {
System.out.println("复制整个文件夹内容操作出错");
e.printStackTrace();
}
}
public void moveFile(String oldPath, String newPath) {
copyFile(oldPath, newPath);
deleteFile(oldPath);
}
public void moveFolder(String oldPath, String newPath) {
copyFolder(oldPath, newPath);
deleteFolder(oldPath);
}
public String getPath() {
String sysPath = this.getClass().getResource("/").getPath();
// 对路径进行修改
sysPath = sysPath.substring(1, sysPath.length() - 16);
return sysPath;
}
}
现在有时间把这些东西整理出来，给大家分享一下……
