上网查找一下 用java程序将GBK字符转成UTF-8编码格式的代码,发现全是C++ 写的,而且很烦琐,
现在自己写了一个java的,以供参考。
package com.lang.string;
public class ConverFromGBKToUTF8 {
public static void main(String[] args){
try {
ConverFromGBKToUTF8 convert = new ConverFromGBKToUTF8();
byte [] fullByte = convert.gbk2utf8(chenese);
String fullStr = new String(fullByte, "UTF-8");
System.out.println("string from GBK to UTF-8 byte: " + fullStr);
} catch (Exception e) {
e.printStackTrace();
}
}
public byte[] gbk2utf8(String chenese){
char c[] = chenese.toCharArray();
byte [] fullByte =new byte[3*c.length];
for(int i=0; i<c.length; i++){
int m = (int)c[i];
String word = Integer.toBinaryString(m);
// System.out.println(word);
StringBuffer sb = new StringBuffer();
int len = 16 - word.length();
//补零
for(int j=0; j<len; j++){
sb.append("0");
}
sb.append(word);
sb.insert(0, "1110");
sb.insert(8, "10");
sb.insert(16, "10");
// System.out.println(sb.toString());
String s1 = sb.substring(0, 8);
String s2 = sb.substring(8, 16);
String s3 = sb.substring(16);
byte b0 = Integer.valueOf(s1, 2).byteValue();
byte b1 = Integer.valueOf(s2, 2).byteValue();
byte b2 = Integer.valueOf(s3, 2).byteValue();
byte[] bf = new byte[3];
bf[0] = b0;
fullByte[i*3] = bf[0];
bf[1] = b1;
fullByte[i*3+1] = bf[1];
bf[2] = b2;
fullByte[i*3+2] = bf[2];
}
return fullByte;
}
}
UTF-8的编码原理和特性:
U+0000~U+007E 1 _ _ _ _ _ _ _ (7bits)
U+0080~U+07FF 1 1 0_ _ _ _ _ 1 0_ _ _ _ _ _ (11bits)
U+0800~U+FFFF 1 1 1 0 _ _ _ _ 1 0 _ _ _ _ _ _ 1 0 _ _ _ _ _ _ (16bits)