Java GBK，UTF-8编码

1、GBK，UTF-8编码

注意：一般默认的是GBK编码。

package io.dol.sn;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;

public class EnCodeStream {

	public static void main(String[] args) throws IOException {
		
		//WriteGBK();
		WriteUTF_8();
	}
	public static void WriteGBK() throws IOException
	{
		//默认是GBK编码
		OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("gbk.txt"));
		//OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("UTF_8.txt","GBK"));
		//注意，此时产生的gbk.txt文件大小为4字节
		osw.write("海豚");
		osw.close();
	}
	public static void WriteUTF_8() throws IOException
	{
		//默认是GBK编码
		OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("UTF_8.txt"),"UTF-8");
		//注意，此时产生的UTF_8.txt文件大小为6字节
		osw.write("海豚");
		osw.close();
	}
}

2、编码解码

用什么格式编码，就用什么格式解码；编码一次，解码一次。

package io.dol.sn;

import java.io.IOException;
import java.util.Arrays;

public class EnCodeStream {

	public static void main(String[] args) throws IOException {
		
		String s1 = "海豚";
		//编码：
		//以下一样，因为默认就是GBK编码
		byte[] bGbk1 = s1.getBytes();
		byte[] bGbk2 = s1.getBytes("GBK");
		//Arrays.toString()将字符数组转化为字符串
		System.out.println(Arrays.toString(bGbk1));
		System.out.println(Arrays.toString(bGbk2));
		//解码：
		String s2 = new String(bGbk1);
		String s3 = new String(bGbk2,"GBK");
		//如果用UTF-8解码，则会出现解码格式错误
		//String s4 = new String(bGbk2,"UTF-8");
		System.out.println(s2);
		System.out.println(s3);
		//这里会打印出“????”
		//System.out.println(s4);
	}
}

3、GBK,UTF-8都支持中文编码

有兴趣的可以去试一下：在记事本中写入“联通”二字，保存后再打开会出现什么现象，为什么呢？