BaseServlet方法分发

最新推荐文章于 2025-03-21 20:45:21 发布

VictorHallidie

最新推荐文章于 2025-03-21 20:45:21 发布

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文章标签： servlet java

本文链接：https://blog.youkuaiyun.com/weixin_43878732/article/details/106077138

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本文介绍了一种基于Servlet的动态方法分发机制，通过分析请求路径和方法名称，利用反射调用相应的方法，实现了灵活的请求处理。该机制允许在不修改Servlet代码的情况下增加新的处理方法。

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package cn.itcast.travel.web.servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;


public class BaseServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp){
        //完成方法分发
        //1.获取请求路径
        String uri = req.getRequestURI(); //   /travel/user/add
        //2.获取方法名称
        String methodName = uri.substring(uri.lastIndexOf('/') + 1);
        //3.获取方法对象Method
        try {
            //获取方法
            Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            //4.执行方法
            
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }


    }
}

package cn.itcast.travel.web.servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/User/*")
public class UserServlet extends BaseServlet {
    public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("UserServlet的add方法...");
    }

    public void find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("UserServlet的find方法...");
    }
}