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:

 

代码如下: 

 

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 stub
		Test 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);
	}
}

 

 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