utf-8转unicode
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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();
}
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unicode转utf-8
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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();
}
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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)；
以上这篇java Unicode和UTF-8之间转换实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://www.cnblogs.com/weibanggang/p/11491199.html