Java Io 字符流

Java Io 字符流包含:

1. InputStreamReader  它是由byte流解析为char流，并且按照给定的编码解析。

2. OutputStreamWrite  它是char流到byte流的转换，并且按照给定的编码处理。

事例代码如下：

package com.dcz.io;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

public class ReaderWriterDemo {

	public static void main(String[] args) throws Exception {

		InputStream fileInputStream = new FileInputStream("D:\\reader.txt");

		// 编码为文本文件的自身的编码格式，否则乱码

		InputStreamReader isr = new InputStreamReader(fileInputStream, "gbk");

		File writeFile = new File("D:\\writer.txt");

		if(!writeFile.exists()){

			writeFile.createNewFile();

		}

		OutputStream fileOutputStream = new FileOutputStream(writeFile);

		OutputStreamWriter osw = new OutputStreamWriter(fileOutputStream, "gbk");

/*		int c;

		while((c = isr.read()) != -1){

			System.out.print((char)c);

		}*/

		char[] charer = new char[2 * 1024];

		int c;

		while((c = isr.read(charer, 0, charer.length)) != -1){

			osw.write(charer, 0, charer.length);

			fileOutputStream.flush();

		}

		osw.close();

		isr.close();

	}

}

3. FileReader

4. FileWriter

这两个流读取文本文件会更方便

	public static void main(String[] args) throws IOException {

		FileReader fr = new FileReader("D:\\reader.txt");

		File writeFile = new File("D:\\writer.txt");

		if(!writeFile.exists()){

			writeFile.createNewFile();

		}

		FileWriter fw = new FileWriter(writeFile);

		int c;

		char[] charer = new char[2 * 1024];

		while((c = fr.read(charer, 0, charer.length)) != -1){

			fw.write(charer, 0, charer.length);

			fw.flush();

		}

		fw.close();

		fr.close();

	}

5. BufferedReader

6. BufferedWriter

缓冲输入/输出流，该流可以一行一行读取，一行一样写入

package com.dcz.io;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.Reader;

import java.io.Writer;

public class BufferReaderWriterDemo {

	public static void main(String[] args) throws Exception {

		// 读取文件，可以一次读取一行文件

		File readerFile = new File("D:\\reader.txt");

		InputStream fis = new FileInputStream(readerFile);

		Reader reader = new InputStreamReader(fis);

		BufferedReader br = new BufferedReader(reader);

		// 写入文件，可以一次写入一行文件

		File writerFile = new File("D:\\writer.txt");

		if(!writerFile.exists()){

			writerFile.createNewFile();

		}

		OutputStream fos = new FileOutputStream(writerFile);

		Writer writer = new OutputStreamWriter(fos);

		BufferedWriter bw = new BufferedWriter(writer);

		String str = "";

		while((str = br.readLine()) != null){

			bw.write(str);

			bw.newLine();

			bw.flush();

		}

		bw.close();

		br.close();

	}

}