How to read the parameters and value from the query-string using java?

Question

I am using Ciui from google code and all the requests are only GET requests and not POST. The calls are made by the ajax (I am not sure). I need to know how to read the "searchstring" parameter from this URL. When I read this in my Servlet using the getQueryString() method I am not able to properly form the actual text. This unicode (when % replaced by /) like text is actually in Chinese. Please let me how to decode search string and create the string.

http://xxxx.com?searchString=%u8BF7%u5728%u6B64%u5904%u8F93%u5165%u4EA7%u54C1%u7F16%u53F7%u6216%u540D%u79F0&button=%E6%90%9C%E7%B4%A2

The other parameter is in proper percentage encoding an I am able to decode using the URL decode. Thanks in advance.

Answer 1

Ok in my case I had the querystring from another source so you maybe need this:

    public static Map<String, String> getQueryMap(String query)  
{  
    String[] params = query.split("&");  
    Map<String, String> map = new HashMap<String, String>();  
    for (String param : params)  
    {  String [] p=param.split("=");
        String name = p[0];  
      if(p.length>1)  {String value = p[1];  
        map.put(name, value);
      }  
    }  
    return map;  
} 

So then you can use:

 Map params=getQueryMap(querystring);
 String id=(String)params.get("id");
 String anotherparam=(String)params.get("anotherparam");

Answer 2

Your encoding scheme for those chinese characters actually violates web standards (namely RFC 3986): the percent sign is a reserved character that may not be used except for the standard percent encoding.

I'd strongly advise you to use the standard encoding scheme (UTF-8 bytes and percent encoding); then you can simply use the standard getParameter() method. If you insist on violating the standard, it may well be impossible to solve your problem within a standards-compliant servlet container.