更改字符串格式

1. 
   import java.io.UnsupportedEncodingException;
   

3. public class ChangeCharset {
   

4. //7位ASCII字符，也叫做ISO646-US，Unicode字符集的基本拉丁快

5. public static final String US_ASCII ="US-ASCII";
   

6. //ISO拉丁字母表No.1,也叫做ISO-LATIN-1

7. public static final String ISO_8859_1="ISO-8859-1";
   

8. //8位UCS轉換格式

9. public static final String UTF_8="UTF-8";
   

10. //16位UCS轉換格式,Big Endian(最低地址存放高位字節)字節順序

11. public static final String UTF_16BE="UTF-16BE";
    

12. //16位UCS轉換格式,Litter Endian(最高地址存放低位字節)

13. public static final String UTF_16LE ="UTF-16LE";
    

14. //16位UCS轉換格式,字節順序由可選的字節順序標記來標識

15. public static final String UTF_16 = "UTF-16";

16. //中文超大字符集

17. public static final String GBK = "GBK";

18. //

19. public static final String GB2312 ="GB2312";

21. public String changeCharSet(String str,String newCharset) throws UnsupportedEncodingException{

22. if(str!=null){

23. //用默認字符編碼解碼字符串,與系統相關,中文Windows默認爲GB2312

24. byte[] bs =str.getBytes();

25. //用新的字符編碼生成字符串

26. return new String(bs,newCharset);

27.         }

28. return null;

29.     }

31. public String changeCharset(String str,String oldCharset,String newCharset) throws UnsupportedEncodingException{

32. if(str != null){

33. //用源字符編碼解碼字符串

34. byte[] bs = str.getBytes(oldCharset);

35. return new String(bs,newCharset);

36.         }

37. return null;

38.     }

40. public String toASCII(String str) throws UnsupportedEncodingException{

41. return this.changeCharSet(str, US_ASCII);

42.     }

44. public String toISO_8859_1(String str) throws UnsupportedEncodingException{

45. return this.changeCharSet(str, ISO_8859_1);

46.     }

48. public String toUTF_8(String str) throws UnsupportedEncodingException{

49. return this.changeCharSet(str, UTF_8);

51.     }

53. public String toUTF_16BE(String str) throws UnsupportedEncodingException{

54. return this.changeCharSet(str, UTF_16BE);

55.     }

57. public String toUTF_16LE(String str) throws UnsupportedEncodingException{

58. return this.changeCharSet(str, UTF_16LE);

59.     }

61. public String toUTF_16(String str) throws UnsupportedEncodingException{

62. return this.changeCharSet(str, UTF_16);

63.     }

65. public String toGBK(String str) throws UnsupportedEncodingException{

66. return this.changeCharSet(str, GBK);

67.     }

69. public String toGB2312(String str) throws UnsupportedEncodingException{

70. return this.changeCharSet(str, GB2312);

71.     }

72. }

將字符串轉換其他格式的前提是將其轉換爲字節數組...