使用指定的码表读写字符

FileReader是使用默认码表读取文件, 如果需要使用指定码表读取, 那么可以使用InputStreamReader(字节流,编码表)

FileWriter是使用默认码表写出文件, 如果需要使用指定码表写出, 那么可以使用OutputStreamWriter(字节流,编码表)

  BufferedReader br = 									//高效的用指定的编码表读
  		new BufferedReader(new InputStreamReader(new FileInputStream("UTF-8.txt"), "UTF-8"));
  BufferedWriter bw = 									//高效的用指定的编码表写
  		new BufferedWriter(new OutputStreamWriter(new FileOutputStream("GBK.txt"), "GBK"));
  int ch;
  while((ch = br.read()) != -1) {
  	bw.write(ch);
  }	
  br.close();
  bw.close();

package com.heima.chario;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;

public class Demo07_TransIO {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		//demo1();
		//demo2();
		BufferedReader br = 								//更高效的读
				new BufferedReader(new InputStreamReader(new FileInputStream("utf-8.txt"), "utf-8"));
		BufferedWriter bw = 								//更高效的写
				new BufferedWriter(new OutputStreamWriter(new FileOutputStream("gbk.txt"), "gbk"));
		int c;
		while((c = br.read()) != -1) {
			bw.write(c);
		}
		
		br.close();
		bw.close();
	}

	public static void demo2() throws UnsupportedEncodingException,
			FileNotFoundException, IOException {
		InputStreamReader isr = new InputStreamReader(new FileInputStream("utf-8.txt"), "uTf-8");	//指定码表读字符
		OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("gbk.txt"), "gbk");	//指定码表写字符
		
		int c;
		while((c = isr.read()) != -1) {
			osw.write(c);
		}
		
		isr.close();
		osw.close();
	}

	public static void demo1() throws FileNotFoundException, IOException {
		//用默认编码表读写,出现乱码
		FileReader fr = new FileReader("utf-8.txt");				
		FileWriter fw = new FileWriter("gbk.txt");
		int c;
		while((c = fr.read()) != -1) {
			fw.write(c);
		}
		fr.close();
		fw.close();
	}
}

来源：CSDN

作者：左绍骏

链接：https://blog.csdn.net/LeoZuosj/article/details/104091803

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码表

字符