servlets - 检查 request.getParameter 是否包含字符串值或整数

Question

我正在尝试使用两个不同的值进行搜索，整数（sin）和姓氏（字符串）我已经能够保存两者，但是如何检查它是否是字符串这是我的代码：

if (request.getParameter("search") != null) {
                String search = request.getParameter("search");
                int searchSin = Integer.getInteger(request.getParameter("search"));
                //If it is a string
                request.setAttribute("employees", employeeService.getEmployeesLastName(search));
                //else if it is an integer
                  request.setAttribute("employees", employeeService.getEmployeesSIN(search));

            }

标签： servlets

Answer 1

试试下面的代码

if (request.getParameter("search") != null) {
    String search = request.getParameter("search");
    //it is an integer
    if(isInteger(search)){
     int searchSin = Integer.getInteger(search);
     request.setAttribute("employees", employeeService.getEmployeesSIN(searchSin));
    }
    //else if it is a string
    else{
        request.setAttribute("employees", employeeService.getEmployeesLastName(search));
    }
}

// check if one string is a integer
private boolean isInteger(String s) {
    try { 
        Integer.parseInt(s); 
    } catch(NumberFormatException e) { 
        return false; 
    } catch(NullPointerException e) {
        return false;
    }
    // only got here if we didn't return false
    return true;
}