Java: to use URLDecoder but reserve the plus sign(+)

Question

I'm writing a lucene server. I want to receive the post query like :
http://www.site.com/search?+title:google +type:website

but the post argument "+title:google +type:website" is encoded like this: "+title:google%20+type:website" so I use URLDecoder.decode(argument,"UTF-8") to get the original input, but I get the wrong result:

" title:goole type:website" , because the URLDecoder convert the plus sign "+" into a space character " ". What can I do to get the decode argument without converting plus sign?

Answer 1

You can try this:

"+title:google%20+type:website".replaceAll("\\\\+", "%2b")

It will replace all plus signs and after that you use the decoder, which will convert back the plus sign

Answer 2

实际上所有空格都将被％20替换，因此一旦获得URL字符串，您就可以将所有％20替换为空格。