只是想知道是否有更优雅或更标准的方法来处理可选参数,或者是否必须检查每个参数是否为空。我有 10 多个可选参数,所以它变得有些难看。
理想情况下,我想要类似 bash 命令的东西:getopts
。
public class MapImageServlet extends HttpServlet {
... constructor and other methods ...
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// OPTIONAL PARAMETERS
if(request.getParameter("boarderSize") != null){
double boarderSize = Double.valueOf(request.getParameter("boarderSize");
}
if(request.getParameter("boarderThickness") != null){
double boarderThickness = Double.valueOf(request.getParameter("boarderThickness");
}
if(request.getParameter("boarderColor") != null){
double boarderColor = Double.valueOf(request.getParameter("boarderColor");
}
... do stuff with the parameters ...
}
... other methods ...
}
最佳答案
像这样写一个工具
public class MapImageServlet extends HttpServlet {
//... constructor and other methods ...
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// OPTIONAL PARAMETERS
boarderSize = ParamUtil.getDoubleValue(request,"boarderSize", defaultValue);
boarderThickness = ParamUtil.getDoubleValue(request, "boarderThickness", defaultValue);
boarderColor = ParamUtil.getDoubleValue(request,"boarderColor" , defaultValue);
//... do stuff with the parameters ...
}
}
public class ParamUtil
{
public static double getDoubleValue(ServletRequest request, String paramName, double defaultValue)
{
if(request.getParameter(paramName) != null){
return Double.valueOf(request.getParameter(paramName));
} else{
return defaultValue;
}
}
}
关于java - 小服务程序 : Handling many optional parameters,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6335759/