字符流出现乱码问题

乱码问题

从文件中读取出现乱码主要有以下两个原因:

1. 编码字符集不统一
2. 截取长度不不够

解决方法

将文件以字节流读入，转换为字符流操作

字节流读入 --InputStreamReader–> 字符缓冲流读入
字节流写出 --OutputStreamReader–> 字符缓冲流写出

new InputStreamReader();
new OutputStreamWriter();

两个问题示例代码

package cn.hxh.io.convert;

import java.io.UnsupportedEncodingException;

public class convertDemo01 {

	public static void main(String[] args) throws UnsupportedEncodingException {
		String str = "你好";
		byte[] data = str.getBytes("gbk");//指定编码
		byte[] data1 = str.getBytes();
		System.out.println(new String(data,"utf-8"));
		System.out.println(new String(data1,1,3));//长度不够
	}

}

引入转换流

package cn.hxh.io.convert;

import java.io.*;

public class convertDemo02 {

	public static void main(String[] args) throws IOException {
		BufferedReader rd = new BufferedReader(
				new InputStreamReader(
						new FileInputStream(
								new File("D:/aa/a.txt")), "utf-8"));
		BufferedWriter wr = new BufferedWriter(
				new OutputStreamWriter(
						new FileOutputStream(
								new File("D:/aa/b.txt"))));
		String s = null;
		while(null != (s = rd.readLine())) {
			wr.write(s);
			wr.newLine();
			wr.flush();
		}
		wr.close();
		rd.close();
	}

}