URL解码而不更改+

Question

我想解码一个网址但仅限于％编码。我想保留非％编码原样：

e.g。

url = 
http%3A%2F%2Fwww.domain.com%2FNews%2Fpolitics%2FMPs%2Brisk%2Blosing%2Bparliamentary%2Bimmunity%2B%2F-%2F1064%2F1395978%2F-%2Flvylki%2F-%2Findex.html

URLDecoder.decode(url, "UTF-8") = http://www.domain.com/News/politics/MPs+risk+losing+parliamentary+immunity+/-/1064/1395978/-/lvylki/-/index.html

但是如果：

url = http://www.domain.com/News/politics/MPs+risk+losing+parliamentary+immunity+/-/1064/1395978/-/lvylki/-/index.html

URLDecoder.decode(url, "UTF-8") = http://www.domain.com/News/politics/MPs risk losing parliamentary immunity /-/1064/1395978/-/lvylki/-/index.html

我想：

URLDecoder.decode(url, "UTF-8") = http://www.domain.com/News/politics/MPs+risk+losing+parliamentary+immunity+/-/1064/1395978/-/lvylki/-/index.html

如何避免URLDecoder.decode()解码+到“”。通常我想保留非％编码的字符串，即只转换％编码。

Answer 1

URLDecoder.decode(url.replaceAll("\\+", "%2B"))