Servlet体系结构

冷不防 2024-04-18 08:35 64阅读 0赞

### 文章目录 ###

*  常用Servlet的体系结构

# 常用Servlet的体系结构 #

如果我们要实现Servlet接口，就要实现Servlet的五个方法  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70]

*  GenericServlet：将servlet接口中其他的方法做了默认空实现，只将service()方法作为抽象。如果接口集成自GenericServlet类，只需要实现service

import javax.servlet.GenericServlet;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.annotation.WebServlet;
    import java.io.IOException;
    
    @WebServlet("/demo2")
    public class ServletDemo2 extends GenericServlet {
        
        @Override
        public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
        
            System.out.printf("aaaaaaaaaaaa");
        }
    }

*  httpServlet：封装http协议，简化操作。

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("/demo3")
    public class ServletDemo3 extends HttpServlet {
        
    
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        
            System.out.printf("doget");
        }
    
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        
            System.out.printf("dopost");
        }
    }

然后就可以直接浏览器访问了

备注：Servlet多重注解

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({
        "/demo3", "demo4"})
    public class ServletDemo3 extends HttpServlet {
        
    
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        
            System.out.printf("doget");
        }
    
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        
            System.out.printf("dopost");
        }
    }

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