字符流

FileReaderDemo

package com.chario;

//FileReader
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

import com.utils.StreamClose;

public class FileReaderDemo {

	public static void main(String[] args) {
		File file = new File("E:\\test\\a.txt");
		// 读取
		System.out.println(read(file));
	}

	private static String read(File file) {
		StringBuffer sb=new StringBuffer();		
		FileReader reader = null;

		try {
			// 每次读取一部分，存入字符数组中
			reader = new FileReader(file);
			int len = 0;
			char[] buf = new char[10];
			while ((len = reader.read(buf)) != -1) {
				sb.append(new String(buf,0,len));
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			StreamClose.readerClose(reader);
		}		
		return sb.toString();
	}
}

FIleReader && FileWriter 读写文件

package com.chario;

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;

import com.utils.StreamClose;

//FIleReader && FileWriter 读写文件
public class FileWriterDemo {

	public static void main(String[] args) {
		// FileReader 读取
		// FileWriter 写出字符

		File source = new File("E:\\test\\Demo.java");
		File targerDir = new File("E:\\copy");
		copyByReader(source, targerDir);
	}

	private static void copyByReader(File source, File targerDir) {
		if (!targerDir.exists()) {
			targerDir.mkdirs();
		}

		Reader reader = null;
		Writer writer = null;

		// 创建reader和writer
		try {
			reader = new FileReader(source);
			writer = new FileWriter(new File(targerDir,source.getName()));

			// 一边读 一边写

			int len = 0;
			char[] buf = new char[100];
			while ((len = reader.read(buf)) != -1) {
				writer.write(buf, 0, len);
			}

			// 刷新缓冲区
			writer.flush();

		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			StreamClose.readerClose(reader);
			StreamClose.writerClose(writer);
		}

	}

}

BufferReaderDemo

package com.chario;

import java.io.*;
import com.utils.StreamClose;

/**
 * BufferedReader && BufferedWriter
 * 
 * @author Administrator
 * 
 */
public class BufferReaderDemo {

	public static void main(String[] args) {
		// FileReader 读取
		// FileWriter 写出字符

		File source = new File("E:\\test\\Demo.java");
		File targerDir = new File("E:\\copy");
		copyByReader(source, targerDir);
	}

	private static void copyByReader(File source, File targerDir) {
		if (!targerDir.exists()) {
			targerDir.mkdirs();
		}

		BufferedReader reader = null;
		BufferedWriter writer = null;

		// 创建reader和writer
		try {
			reader = new BufferedReader(new FileReader(source));
			writer = new BufferedWriter(new FileWriter(new File(targerDir,
					source.getName())));

			// 读一行 写一行

			/*
			String line = "";
			while ((line = reader.readLine()) != null) {
				writer.write(line);
				writer.newLine();
				// 刷新缓冲区
				//writer.println(line);				
			}
			*/
			// (2)一边读，一边写
			int len = 0;
			char[] cbuf = new char[100];
			while ((len = reader.read(cbuf)) != -1) {
				writer.write(cbuf, 0, len);
			}

			writer.flush();

		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			StreamClose.readerClose(reader);
			StreamClose.writerClose(writer);
		}
	}
}

WriterDemo  把字符串写入文件

package com.chario;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import com.utils.StreamClose;

public class WriterDemo {
	public static void main(String[] args) {
		FileWriter writer=null;
		try {
			writer = new FileWriter(new File("E:\\test\\text.txt"));
			writer.write("今天天气不错哟");
			writer.flush();
		} catch (IOException e) {
			e.printStackTrace();
		}finally{
			StreamClose.writerClose(writer);
		}
		
	}
}

InputStreamReaderDemo

package com.chario;

import java.io.*;
public class InputStreamReaderDemo {	
	public static void main(String[] args) {
		//编码：字符流不能指定编码格式
		FileInputStream fis=null;
		//字节流
		BufferedReader br=null;

		try {
			fis=new FileInputStream("E:\\test\\a.txt");
			//字节--》字符
			InputStreamReader isr=new InputStreamReader(fis,"UTF-8");
			
			br=new BufferedReader(isr);
			
			String line="";
			while((line=br.readLine())!=null){
				System.out.println(line);
			}
			
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}		
	}

}