java获取字节的长度.

我们经常要获取中文,数字,或者英文字符所占字节的长度,下面就列出各种编码格式下所占字节的长度:

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代码如下:?

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package pack.java.midea.dao;import java.io.UnsupportedEncodingException;/** * 测试; * @author zhouhaitao * 2012-5-17 */public class Test {/** * @param args * @throws UnsupportedEncodingException  */public static void main(String[] args) throws UnsupportedEncodingException {// TODO Auto-generated method stubTest test = new Test();String a = "在";test.getStringByteLength(a);System.out.println("--------------------------------------");String b = "A";test.getStringByteLength(b);String c = "1";test.getStringByteLength(c);}/** * 获取字符的所占字节长度; * @param str * @throws UnsupportedEncodingException */private void getStringByteLength(String str) throws UnsupportedEncodingException{System.out.println("\""+str+"\"字符所占的字节长度如下:");System.out.println("ISO-8859-1:"+str.getBytes("ISO-8859-1").length);System.out.println("UTF-8:"+str.getBytes("UTF-8").length);System.out.println("GBK:"+str.getBytes("GBK").length);System.out.println("GB2312:"+str.getBytes("GB2312").length);System.out.println("GB18030:"+str.getBytes("GB18030").length);System.out.println("UTF-16:"+str.getBytes("UTF-16").length);}}

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?控制台输出结果:

--------------------------------------

"在"字符所占的字节长度如下:
ISO-8859-1:1
UTF-8:3
GBK:2
GB2312:2
GB18030:2
UTF-16:4
--------------------------------------
"A"字符所占的字节长度如下:
ISO-8859-1:1
UTF-8:1
GBK:1
GB2312:1
GB18030:1
UTF-16:4
"1"字符所占的字节长度如下:
ISO-8859-1:1
UTF-8:1
GBK:1
GB2312:1
GB18030:1
UTF-16:4