currently I'm facing an issue where the URL that are outputted in the console is different from the actual URL display in the nav bar. I look at the value that I had regex, it was correct but when put into IE, it is different. The URL in the nav bar would be only a=test instead of a=test&c=import&f=&uid=user1 which is what is shown in the console. May I know how to solve this? Thanks.

Here is the codes for it.

    UserID user = new UserID();
    
    
    public static void main(String[] args) {
        
        String newUrl = replaceUserID(url);
        System.out.print("cmd.exe /c start iexplore -k "   newUrl);
        
        try{
            Process p = Runtime.getRuntime().exec("cmd.exe /c start iexplore "   newUrl);
            
            try{
                p.waitFor();
            }
            catch( InterruptedException ie ){
                System.out.println("InterruptedException "   ie.getMessage());
            }
            InputStream err = p.getErrorStream();
            int ctr = 0;
            if ( (ctr = err.available()) > 0 ){
                byte[] buf = new byte[ctr];
                System.out.println("Process failed with error:\n"   new String(buf, 0, ctr));
                }
            }
            catch(IOException ioe)
            {
                System.out.println("InterruptedException "   ioe.getMessage());
            }
    }
    
    public static String checkUserID(){     
        String username = System.getenv("USERNAME"); //grab user login id for windows
        return username;
    }
    
    public static String replaceUserID(String oldUrl) {
        String params = "http://example.com?a=test&c=import&f=&uid=userid";
        String username = checkUserID();
        
        try {
            Pattern p = Pattern.compile("uid=([^&%] )");
            Matcher m = p.matcher(params);
            while (m.find()) {
//              System.out.println(m.group(1).toString());
                if(m.group(1).toString() != username) {
                    //replace url paremeters with correct userID.
                    String newUrl = params.replace(m.group(1).toString(), username);
                    return newUrl;
                }
                else {
                    System.out.println("The username is the same");
                    return params;
                }
            } 
        } catch (PatternSyntaxException ex) {
            // error handling
            ex.printStackTrace();
        }
        return oldUrl;
    }

CodePudding user response：

& has a special meaning to the command line (concat commands, see here: How do I run two commands in one line in Windows CMD?).

You need to escape the url or maybe the entire command. If I remember correctly you need to put double quotes around it: "...iexplore -k \"" newUrl "\""