1，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)

【1】 代码分析

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 Demo7_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();

}

}

2，转换流图解

画图分析转换流

标签：字符,java,import,读写,io,new,close,JAVA,码表

来源： https://blog.csdn.net/Cricket_7/article/details/95076775