IO流

标签：io java

下面是几个常用的几个IO对象。对于IO流的学习。只需要搞清楚每个类的作用，熟悉一两个类的操作基本，IO流学习就差不多了。

字符流

package IO;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

/**
 * 字符流
 * @author Administrator
 *
 */
public class string_io {
	/**
	 * 通过FileReader字符流读取数据
	 * @throws IOException 
	 * 
	 */
	public void filereader() throws IOException{
		File file = new File("file.txt");
		Reader reader = new FileReader(file);
		char []buffer = new char[1024];
		int len=0;
		while((len = reader.read(buffer))!=-1){
			System.out.println(new String(buffer,0,len));
		}
		reader.close(); 
	}
	/**
	 * 通过FileWriter字符流写数据
	 * @throws IOException 
	 */
	public void filewriter() throws IOException{
		File file = new File("file.txt");
		Writer writer = new FileWriter(file,true);
		writer.write("字符流");
		writer.flush();
		writer.close();
	}
	/**
	 * 缓冲流，BufferedReader一次读一行
	 * @throws IOException 
	 */
	public void buffereReader() throws IOException{
		BufferedReader br = new BufferedReader(new FileReader(new File("file.txt")));
		String buffer;
		while((buffer=br.readLine())!=null){
			System.out.println(buffer);
		}
		br.close();
	}
	/**
	 * 缓冲流一次写一行
	 * @throws IOException 
	 */
	public void buffereWriter() throws IOException{
		BufferedWriter bw = new BufferedWriter(new FileWriter(new File("file2.txt")));
		bw.write("第一行");
		bw.newLine();  //换行符
		bw.write("第二行");
		bw.newLine();
		bw.close();
	}
	
	/**
	 * 缓冲流复制
	 */
	public void copy(String Resouce,String Goal) throws IOException{
		BufferedReader br = new BufferedReader(new FileReader(new File(Resouce)));
		BufferedWriter bw = new BufferedWriter(new FileWriter(new File(Goal)));
		String buffer;
		while((buffer=br.readLine())!=null){
			bw.write(buffer);
			bw.newLine();  //换行符
		}
		br.close();
		bw.close();
	}
}

字节流

package IO;

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.FileReader;
import java.io.IOException;
import java.io.Reader;

/**
 **************字节流************
 * @author Administrator
 *
 */
public class byte_io {
	private String file_path;
	public byte_io(String file_path){
		this.file_path = file_path;
	}
	/**
	 * FileInputStream类读取文件
	 * @throws IOException 
	 */
	public void inputstream() throws IOException{
		File file = new File(file_path);
		FileInputStream fis = new FileInputStream(file);
		byte []buffer = new byte[100];
		int len=0;
		while((len=fis.read(buffer))!=-1){
			System.out.println(new String(buffer,0,len));
		}
		fis.close();
	}
	/**
	 * FlieOutputStream写文件
	 * 写文件
	 * @throws IOException 
	 */
	public void outputstream() throws IOException{
		File file = new File(file_path);
		FileOutputStream fos = new FileOutputStream(file,true);
		fos.write("我想大声高数你".getBytes());
		fos.flush();
		fos.close();
	}
	/**
	 * 通过上面的读写 来完成文件复制
	 * @param sourcefile
	 * @param goalfile
	 * @throws IOException 
	 */
	public void copy(String Sourcefile,String Goalfile) throws IOException{
		//创建输入流
		File sourcefile = new File(Sourcefile);
		FileInputStream fis = new FileInputStream(sourcefile);
		//创建输出流
		File goalfile = new File(Goalfile);
		FileOutputStream fos = new FileOutputStream(goalfile);
		
		//读取源文件，写入输入到目标文件
		byte[]buffer = new byte[1024];
		int len=0;
		while((len=fis.read(buffer))!=-1){
			fos.write(buffer, 0, len);
		}
		fis.close();
		fos.close();
	}
	
	/**
	 * 缓冲流是提高了效率，缓冲8M，文件的复制,字节流可以复制任意格式的文件
	 * @param Sourcefile
	 * @param Goalfile
	 * @throws IOException
	 */
	public void copy2(String Sourcefile,String Goalfile) throws IOException{
		//声明缓冲输入流，读取文件
		BufferedInputStream bis = new BufferedInputStream(new FileInputStream(new File(Sourcefile)));
		//声明缓冲输出流，写文件
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File(Goalfile)));
		
		byte[] buffer = new byte[1024*2];
		int len=0;
		while((len=bis.read(buffer))!=-1){
			bos.write(buffer, 0, len);
		}
		bis.close();
		bos.close();
	}
}

http://www.2cto.com/kf/201312/262036.html

http://blog.csdn.net/yczz/article/details/38761237

附上jdk1.6中文版下载地址，遇到不懂的类，没事多查查，翻翻。

http://download.csdn.net/detail/xiaomin1992/8652131

IO流

标签：io java

原文地址：http://blog.csdn.net/xiaomin1992/article/details/45419649