java Unicode和UTF-8之间转换实例

utf-8转unicode

 public static String utf8ToUnicode(String inStr) {
    char[] myBuffer = inStr.toCharArray();
    
    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < inStr.length(); i++) {
     UnicodeBlock ub = UnicodeBlock.of(myBuffer[i]);
      if(ub == UnicodeBlock.BASIC_LATIN){
       //英文及数字等
       sb.append(myBuffer[i]);
      }else if(ub == UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS){
       //全角半角字符
       int j = (int) myBuffer[i] - 65248;
       sb.append((char)j);
      }else{
       //汉字
       short s = (short) myBuffer[i];
        String hexS = Integer.toHexString(s);
        String unicode = "\\u"+hexS;
       sb.append(unicode.toLowerCase());
      }
    }
    return sb.toString();
  }

unicode转utf-8

public static String unicodeToUtf8(String theString) {
 char aChar;
 int len = theString.length();
 StringBuffer outBuffer = new StringBuffer(len);
 for (int x = 0; x < len;) {
  aChar = theString.charAt(x++);
  if (aChar == '\\') {
  aChar = theString.charAt(x++);
  if (aChar == 'u') {
   // Read the xxxx
   int value = 0;
   for (int i = 0; i < 4; i++) {
   aChar = theString.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:
    throw new IllegalArgumentException(
     "Malformed  \\uxxxx  encoding.");
   }
   }
   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();
 }

补充知识：java get请求带参数报错 java.io.IOException: Server returned HTTP response code: 400 for URL

解决方案

在使用JAVA发起http请求的时候，经常会遇到这个错误，我们copy请求地址在浏览器中运行的时候又是正常运行的，造成这个错误的原因主要是因为请求的URL中包含空格，这个时候我们要使用URLEncoder.encode(timestamp,"utf-8")对含有空格的参数进行处理;(注：只对需要处理的参数部分进行处理，不要把整个URL放进去，如果整个URL放进去会对URL中的"//"也会进行处理)；

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