java unicode转UTF-8

2022-09-09 02:10 49阅读 0赞

package data.test;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    public class UnicodeToUtf8 { 
    	
    	private static final Logger logger = LoggerFactory.getLogger(UnicodeToUtf8.class);
    	
    	public static String decodeUnicode(String unicodeStr) { 
    		char aChar;
    		int len = unicodeStr.length();
    		StringBuffer outBuffer = new StringBuffer(len);
    		for (int x = 0; x < len;) { 
    			aChar = unicodeStr.charAt(x++);
    			if (aChar == '\\') { 
    				aChar = unicodeStr.charAt(x++);
    				if (aChar == 'u') { 
    					// Read the xxxx
    					int value = 0;
    					for (int i = 0; i < 4; i++) { 
    						aChar = unicodeStr.charAt(x++);
    						switch (aChar) { 
    						case '0':
    						case '1':
    						case '2':
    						case '3':
    						case '4':
    						case '5':
    						case '6':
    						case '7':
    						case '8':
    						case '9':
    							value = (value << 4) + aChar - '0';
    							break;
    						case 'a':
    						case 'b':
    						case 'c':
    						case 'd':
    						case 'e':
    						case 'f':
    							value = (value << 4) + 10 + aChar - 'a';
    							break;
    						case 'A':
    						case 'B':
    						case 'C':
    						case 'D':
    						case 'E':
    						case 'F':
    							value = (value << 4) + 10 + aChar - 'A';
    							break;
    						default:
    							logger.warn("{}","UnicodeToUtf8 exception!");
    							return "";
    						}
    
    					}
    					outBuffer.append((char) value);
    				} else { 
    					if (aChar == 't')
    						aChar = '\t';
    					else if (aChar == 'r')
    						aChar = '\r';
    					else if (aChar == 'n')
    						aChar = '\n';
    					else if (aChar == 'f')
    						aChar = '\f';
    					outBuffer.append(aChar);
    				}
    			} else
    				outBuffer.append(aChar);
    		}
    		return outBuffer.toString();
    	}
    	
    	public static void main(String[] args) { 
    		String str = "\u7acb\u767d_\u5168\u81ea\u52a8\u6d53\u7f29_\u6d17\u8863\u7c89_900g";
    		str = decodeUnicode(str);
    		System.out.println(str);
    		
    	}
    	
    }