字节流
作者：互联网
字节流
输入流FileInputStream，读文件
输出流FileOutputStream,写文件
FileInputStream inputStream=new FileInputStream(srcFile);
FileOutputStream outStream=new FileOutputStream(destFile);
字节缓冲输入流：BufferedInputStream bit=new BufferedInputStream(new FileInputStream(srcFile));
字节缓冲输出流：BufferedOutputStream bot=new BufferedOutputStream(new FileOutputStream(destFile));
package task;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class TaskIo {
public static void copyFile(File srcFile) throws IOException {
File destFile=new File("e:\\b",srcFile.getName());//此处修改目标文件夹
FileInputStream inputStream=new FileInputStream(srcFile);
FileOutputStream outStream=new FileOutputStream(destFile);
byte[] bytes=new byte[1024];
int len=0;
while((len=inputStream.read(bytes))!=-1) {
outStream.write(bytes,0,len);
}
inputStream.close();
outStream.close();
}
public static void copyFolder(File srcFile) throws IOException {
File[] files=srcFile.listFiles();
for(File f:files) {
if(f.isDirectory()) {
copyFolder(f);
}else {
copyFile(f);
}
}
}
public static void deleteFile(File srcFile) {
File[] files=srcFile.listFiles();
for(File f:files) {
if(f.isDirectory()) {
deleteFile(f);
}else {
f.delete();
}
}
}
public static void deleteFile(String srcPath) {
File src=new File(srcPath);
File[] files=src.listFiles();
for(File f:files) {
if(f.isDirectory()) {
deleteFile(f);
}else {
f.delete();
}src.delete();//复制到新文件夹后，把原来路径总文件夹也删了
}
}
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
//把e盘a文件夹下的tiku.txt文件，复制到b文件夹里,复制一个文件
// FileInputStream stream=new FileInputStream("E:\\a\\tiku.txt");
// FileOutputStream outStream=new FileOutputStream("E:\\b\\tiku.txt");
// byte[] bytes=new byte[1024];
// int len=0;
// while((len=stream.read(bytes))!=-1) {
// outStream.write(bytes,0,len);
// }
// stream.close();
// outStream.close();
// 把e盘a文件夹下的所有文件，复制到b文件夹里,b文件夹必须存在
// File srcFile=new File("e:\\a");
// copyFolder(srcFile);
// 把e盘a文件夹下的所有文件，剪切到b文件夹里,b文件夹必须存在
// File srcFile=new File("e:\\a");
// copyFolder(srcFile);
// deleteFile(srcFile);
// 复制指定文件夹到指定目录，指定目录可能不存在
// String srcPath="e:\\b";
// String destPath="e:\\a";
// copyDir1(srcPath,destPath);
// deleteFile(srcPath);
// 复制的文件内容很大，分别用读取一组字节，字节缓冲流读取一组字节，看哪个快
// String srcPath="e:\\java\\视频";
// String destPath="e:\\b";
// long a=System.currentTimeMillis();
// copyDir1(srcPath,destPath);
// long b=System.currentTimeMillis();
// System.out.println(b-a);
// 74965
// String srcPath="e:\\java\\视频";
// String destPath="e:\\c";
// long a=System.currentTimeMillis();
// copyDir2(srcPath,destPath);
// long b=System.currentTimeMillis();
// System.out.println(b-a);
// 52310
}
public static void copyDir1(String srcPath,String destPath) throws IOException {
File src=new File(srcPath);
File dest=new File(destPath);
File[] srcFiles=src.listFiles();
if(!dest.exists()) {
dest.mkdirs();
}
for(File srcFile:srcFiles) {
if(srcFile.isDirectory()) {
String dirName=srcFile.getName();
File newDestDir=new File(dest,dirName);
//递归，用来复制源文件的所有文件夹(不含文件)
copyDir1(srcFile.getPath(),newDestDir.getPath());
}else {
String destName=srcFile.getName();
File destFile=new File(dest,destName);
copyFile1(srcFile,destFile);
}
}
}
public static void copyDir2(String srcPath,String destPath) throws IOException {
File src=new File(srcPath);
File dest=new File(destPath);
File[] srcFiles=src.listFiles();
if(!dest.exists()) {
dest.mkdirs();
}
for(File srcFile:srcFiles) {
if(srcFile.isDirectory()) {
String dirName=srcFile.getName();
File newDestDir=new File(dest,dirName);
//递归，用来复制源文件的所有文件夹(不含文件)
copyDir2(srcFile.getPath(),newDestDir.getPath());
}else {
String destName=srcFile.getName();
File destFile=new File(dest,destName);
copyFile2(srcFile,destFile);
}
}
}
public static void copyFile1(File srcFile,File destFile) throws IOException {
FileInputStream inputStream=new FileInputStream(srcFile);
FileOutputStream outStream=new FileOutputStream(destFile);
byte[] bytes=new byte[1024];
int len=0;
while((len=inputStream.read(bytes))!=-1) {
outStream.write(bytes,0,len);
}
inputStream.close();
outStream.close();
}
public static void copyFile2(File srcFile,File destFile) throws IOException {
BufferedInputStream bit=new BufferedInputStream(new FileInputStream(srcFile));
BufferedOutputStream bot=new BufferedOutputStream(new FileOutputStream(destFile));
byte[] bytes=new byte[1024];
int len=0;
while((len=bit.read(bytes))!=-1) {
bot.write(bytes,0,len);
}
bit.close();
bot.close();
}
}
标签：String,srcFile,文件夹,File,srcPath,new,字节 来源： https://www.cnblogs.com/j99426/p/15078231.html