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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

 1 package cn.hxh.io.convert;
 2 
 3 import java.io.UnsupportedEncodingException;
 4 
 5 public class convertDemo01 {
 6 
 7     public static void main(String[] args) throws UnsupportedEncodingException {
 8         String str = "你好";
 9         byte[] data = str.getBytes("gbk");//指定编码
10         byte[] data1 = str.getBytes();
11         System.out.println(new String(data,"utf-8"));
12         System.out.println(new String(data1,1,3));//长度不够
13     }
14 
15 }

 

引入转换流

 1 package cn.hxh.io.convert;
 2 
 3 import java.io.*;
 4 
 5 public class convertDemo02 {
 6 
 7     public static void main(String[] args) throws IOException {
 8         BufferedReader rd = new BufferedReader(
 9                 new InputStreamReader(
10                         new FileInputStream(
11                                 new File("D:/aa/a.txt")), "utf-8"));
12         BufferedWriter wr = new BufferedWriter(
13                 new OutputStreamWriter(
14                         new FileOutputStream(
15                                 new File("D:/aa/b.txt"))));
16         String s = null;
17         while(null != (s = rd.readLine())) {
18             wr.write(s);
19             wr.newLine();
20             wr.flush();
21         }
22         wr.close();
23         rd.close();
24     }
25 
26 }

 

posted @ 2020-01-28 18:52  shimeath  阅读(411)  评论(0)    收藏  举报