中文与unicode互换

public String unicode2Chinese(String utfString){ 
    StringBuilder sb = new StringBuilder(); 
    int i = -1; 
    int pos = 0; 
   
    while((i=utfString.indexOf("\\u", pos)) != -1){ 
        sb.append(utfString.substring(pos, i)); 
        if(i+5<utfString.length()){ 
            pos = i+6; 
            sb.append((char)Integer.parseInt(utfString.substring(i+2, i+6), 16)); 
        } 
    }
       
    sb.append(utfString.substring(pos));
         
    return sb.toString(); 
}

public boolean isChinese(char c){ 
    Character.UnicodeBlock ub = Character.UnicodeBlock.of(c); 
    if(ub==Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
       ||ub==Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
       ||ub==Character.UnicodeBlock.GENERAL_PUNCTUATION 
       ||ub==Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION 
       ||ub==Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS
         ||ub==Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A)
    { 
return true; 
    } 
    return false; 
} 


public static String chinese2Unicode(String str){ 
    String result=""; 
    for(int i=0;i<str.length();i++){ 
        int chr1 = (char) str.charAt(i); 
        if(chr1>=19968&&chr1<=171941){//汉字范围 \u4e00-\u9fa5 (中文) 
            result+="\\u" + Integer.toHexString(chr1); 
        }else{ 
            result+=str.charAt(i); 
        } 
    } 
    return result; 
}