Java I18n 简明教程

Unicode Conversion from/to Reader/Writer

读取器和写入器类是面向字符的流类。这些可用于读取和转换 Unicode 字符。

Reader and Writer classes are character oriented stream classes. These can be used to read and convert Unicode characters.

Conversion

以下示例将展示如何使用读取器和写入器类将 Unicode 字符串转换为 UTF8 字节数组，将 UTF8 字节数组转换为 Unicode 字节数组。

Following example will showcase conversion of a Unicode String to UTF8 byte[] and UTF8 byte[] to Unicode byte[] using Reader and Writer classes.

Example

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.Charset;
import java.text.ParseException;

public class I18NTester {
   public static void main(String[] args) throws ParseException, IOException {

      String input = "This is a sample text" ;

      InputStream inputStream = new ByteArrayInputStream(input.getBytes());

      //get the UTF-8 data
      Reader reader = new InputStreamReader(inputStream, Charset.forName("UTF-8"));

      //convert UTF-8 to Unicode
      int data = reader.read();
      while(data != -1){
         char theChar = (char) data;
         System.out.print(theChar);
         data = reader.read();
      }
      reader.close();

      System.out.println();

      //Convert Unicode to UTF-8 Bytes
      ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
      Writer writer = new OutputStreamWriter(outputStream, Charset.forName("UTF-8"));

      writer.write(input);
      writer.close();

      String out = new String(outputStream.toByteArray());

      System.out.println(out);
   }
}

它将打印以下结果。

It will print the following result.

This is a sample text
This is a sample text