servlet里，哪个语法可以获取urlPatterns的值？

request.getParameter();大概是这个，你试试。

getServletPath()

获取url中携带的参数？如果是一楼答案就是对的用request获取

获取urlPatterns的值，是要获取请求路径下的url吗

req.getRequestURI().substring(req.getContextPath().length()); 把项目名去掉了。

protected void doGet(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {
    PrintWriter writer = response.getWriter();
    writer.println("GET " + request.getRequestURL() + " "
            + request.getQueryString());

    Map<String, String[]> params = request.getParameterMap();
    String queryString = "";
    for (String key : params.keySet()) {
        String[] values = params.get(key);
        for (int i = 0; i < values.length; i++) {
            String value = values[i];
            queryString += key + "=" + value + "&";
        }
    }
    // 去掉最后一个空格
    queryString = queryString.substring(0, queryString.length() - 1);
    writer.println("GET " + request.getRequestURL() + " " + queryString);
}

protected void doPost(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {
    PrintWriter writer = response.getWriter();
    Map<String, String[]> params = request.getParameterMap();
    String queryString = "";
    for (String key : params.keySet()) {
        String[] values = params.get(key);
        for (int i = 0; i < values.length; i++) {
            String value = values[i];
            queryString += key + "=" + value + "&";
        }
    }
    // 去掉最后一个空格
    queryString = queryString.substring(0, queryString.length() - 1);
    writer.println("POST " + request.getRequestURL() + " " + queryString);
}

request.getRequestURI()