文件的拷贝[Java]

输入流读取数据，输出流写入数据，在输入的同时，进行输出实现数据的拷贝

  • 输入流读取数据，输出流写入数据，在输入的同时，进行输出实现数据的拷贝

文件的拷贝

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package cn.io;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
 * 文件拷贝：文件字节输入，输出流
 * 
 * @author HQF
 *
 */
public class Copy {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		//1. 创建源 将abc拷贝到ab
		File desFile = new File("abc");
		File srcFile = new File("ab.txt");
		//2. 选择流
		OutputStream oStream = null;
		InputStream iStream = null;
		
		try {
			oStream = new FileOutputStream(srcFile,true);
			iStream = new FileInputStream(desFile);
			//3. 操作(分段读取)
			byte[] flush = new byte[1024];//缓冲容器
			int len = -1;//接受长度
			while((len = iStream.read(flush)) != -1) {
				//字节数组-->字符串（解码）
				oStream.write(flush,0,len);
			}
			oStream.flush();
			
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			//分别释放资源，先打开的后关闭
			if (null != oStream) {
				oStream.close();
			}
			
			if (package cn.io;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
 * 文件拷贝：文件字节输入，输出流
 * 
 * @author HQF
 *
 */
public class Copy {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		//1. 创建源 将abc拷贝到ab
		File desFile = new File("abc");
		File srcFile = new File("ab.txt");
		//2. 选择流
		OutputStream oStream = null;
		InputStream iStream = null;
		
		try {
			oStream = new FileOutputStream(srcFile,true);
			iStream = new FileInputStream(desFile);
			//3. 操作(分段读取)
			byte[] flush = new byte[1024];//缓冲容器
			int len = -1;//接受长度
			while((len = iStream.read(flush)) != -1) {
				//字节数组-->字符串（解码）
				oStream.write(flush,0,len);
			}
			oStream.flush();
			
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			//分别释放资源，先打开的后关闭
			if (null != oStream) {
				oStream.close();
			}
			
			if (null != iStream) {
				iStream.close();
			}
		}
	}

}

最后进行封装，复制任何文件

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package cn.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * 文件拷贝：文件字节输入，输出流
 * 
 * @author HQF
 *
 */
public class Copy {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
	copy("E:\\JAVA\\cn.shangxuetang\\image\\2.jpg", "2copy.jpg");
	}

	public static void copy(String srcStream,String destStream) throws IOException {
		//1. 创建源
		File desFile = new File(srcStream);//源头
		File srcFile = new File(destStream);//目的地
		//2. 选择流
		OutputStream oStream = null;
		InputStream iStream = null;
		
		try {
			oStream = new FileOutputStream(srcFile,true);
			iStream = new FileInputStream(desFile);
			//3. 操作(分段读取)
			byte[] flush = new byte[1024];//缓冲容器
			int len = -1;//接受长度
			while((len = iStream.read(flush)) != -1) {
				//字节数组-->字符串（解码）
				oStream.write(flush,0,len);
			}
			oStream.flush();
			
	
		
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			//分别释放资源，先打开的后关闭
			if (null != oStream) {
				oStream.close();
			}
			
			if (package cn.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * 文件拷贝：文件字节输入，输出流
 * 
 * @author HQF
 *
 */
public class Copy {

	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
	copy("E:\\JAVA\\cn.shangxuetang\\image\\2.jpg", "2copy.jpg");
	}

	public static void copy(String srcStream,String destStream) throws IOException {
		//1. 创建源
		File desFile = new File(srcStream);//源头
		File srcFile = new File(destStream);//目的地
		//2. 选择流
		OutputStream oStream = null;
		InputStream iStream = null;
		
		try {
			oStream = new FileOutputStream(srcFile,true);
			iStream = new FileInputStream(desFile);
			//3. 操作(分段读取)
			byte[] flush = new byte[1024];//缓冲容器
			int len = -1;//接受长度
			while((len = iStream.read(flush)) != -1) {
				//字节数组-->字符串（解码）
				oStream.write(flush,0,len);
			}
			oStream.flush();
			
	
		
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			//分别释放资源，先打开的后关闭
			if (null != oStream) {
				oStream.close();
			}
			
			if (null != iStream) {
				iStream.close();
			}
		}
	}
}