字符串編碼的轉換

 1 package com.jdk7.chapter5;  2 
 3 import java.io.UnsupportedEncodingException;  4 
 5 public class ChangeCharsetTest {  6     //公共的惟一靜態變量
 7     public static final String US_ASCII = "US-ASCII";  8     public static final String ISO_8859_1 = "ISO-8859-1";  9     public static final String UTF_8 = "UTF-8"; 10     public static final String UTF_16BE = "UTF-16BE"; 11     public static final String UTF_16LE = "UTF-16LE"; 12     public static final String UTF_16 = "UTF-16"; 13     public static final String GBK = "GBK"; 14     
15     public String toUS_ASCII(String str) throws UnsupportedEncodingException{ 16         return changeCharset(str, this.US_ASCII); 17  } 18     
19     public String toISO_8859(String str) throws UnsupportedEncodingException{ 20         return changeCharset(str, this.ISO_8859_1); 21  } 22     
23     public String toUTF_8(String str) throws UnsupportedEncodingException{ 24         return changeCharset(str, this.UTF_8); 25  } 26     
27     public String toUTF_16BE(String str) throws UnsupportedEncodingException{ 28         return changeCharset(str, this.UTF_16BE); 29  } 30     
31     public String toUTF_16LE(String str) throws UnsupportedEncodingException{ 32         return changeCharset(str, this.UTF_16LE); 33  } 34     
35     public String toUTF_16(String str) throws UnsupportedEncodingException{ 36         return changeCharset(str, this.UTF_16); 37  } 38     
39     public String toGBK(String str) throws UnsupportedEncodingException{ 40         return changeCharset(str, this.GBK); 41  } 42     
43     public String changeCharset(String str, String newCharset) throws UnsupportedEncodingException{ 44         byte[] bt = str.getBytes(); 45         return new String(bt, newCharset); 46  } 47     
48     public String changeCharset(String str, String newCharset, String oldCharset) throws UnsupportedEncodingException{ 49         byte[] bt = str.getBytes(oldCharset); 50         return new String(bt, newCharset); 51  } 52     
53     public static void main(String[] args) throws UnsupportedEncodingException { 54         ChangeCharsetTest cct = new ChangeCharsetTest(); 55         String str = "This is 中文 charset!"; 56         System.out.println("cct.toUS_ASCII("+str+")>"+cct.toUS_ASCII(str)); 57         System.out.println("cct.toGBK("+str+")>"+cct.toGBK(str)); 58         System.out.println("cct.toISO_8859("+str+")>"+cct.toISO_8859(str)); 59         System.out.println("cct.toUTF_16("+str+")>"+cct.toUTF_16(str)); 60         System.out.println("cct.toUTF_16BE("+str+")>"+cct.toUTF_16BE(str)); 61         System.out.println("cct.toUTF_16LE("+str+")>"+cct.toUTF_16LE(str)); 62         System.out.println("cct.toUTF_8("+str+")>"+cct.toUTF_8(str)); 63         System.out.println("GBK to ISO_8859_1>"+cct.changeCharset(str, GBK, ISO_8859_1)); 64         System.out.println("GBK to US_ASCII>"+cct.changeCharset(str, GBK, US_ASCII)); 65         System.out.println("GBK to UTF_16>"+cct.changeCharset(str, GBK, UTF_16)); 66         System.out.println("GBK to UTF_16BE>"+cct.changeCharset(str, GBK, UTF_16BE)); 67         System.out.println("GBK to UTF_16LE>"+cct.changeCharset(str, GBK, UTF_16LE)); 68         System.out.println("GBK to UTF_8>"+cct.changeCharset(str, GBK, UTF_8)); 69  } 70 } 71 
72 執行結果： 73 cct.toUS_ASCII(This is 中文 charset!)>This is ???? charset!
74 cct.toGBK(This is 中文 charset!)>This is 中文 charset!
75 cct.toISO_8859(This is 中文 charset!)>This is ???? charset!
76 cct.toUTF_16(This is 中文 charset!)>周楳?猠???橈牳整?
77 cct.toUTF_16BE(This is 中文 charset!)>周楳?猠???橈牳整?
78 cct.toUTF_16LE(This is 中文 charset!)>桔獩槧???撓慨獲瑥?
79 cct.toUTF_8(This is 中文 charset!)>This is ???? charset!
80 GBK to ISO_8859_1>This is ?? charset!
81 GBK to US_ASCII>This is ?? charset!
82 GBK to UTF_16>?