springmvc的两个处理器适配器(四)


1.SimpleControllerHandlerAdapter(默认)

使用该处理器适配器需要自定义Controller实现Controller接口,否则会找不到对应的controller
默认的Controller适配器

    <!-- 配置处理器适配器执行Controlelr ,springmvc默认的SimpleControllerHandlerAdapter:执行Controller-->
        <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>

SimpleControllerHandlerAdapter源码

    public class SimpleControllerHandlerAdapter implements HandlerAdapter {

    public boolean supports(Object handler) {
        return (handler instanceof Controller);
    }

    public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {

        return ((Controller) handler).handleRequest(request, response);
    }

    public long getLastModified(HttpServletRequest request, Object handler) {
        if (handler instanceof LastModified) {
            return ((LastModified) handler).getLastModified(request);
        }
        return -1L;
    }
}

通过查看源码可知,需要先判断自定义的controller是否实现的Controller接口才会执行后面的方法
这里写图片描述


2.HttpRequestHandlerAdapter

HttpRequestHandlerAdapter处理器适配器将http请求封装成HttpServletResquest 和HttpServletResponse对象，和servlet接口类似

1.配置xml文件

<!-- 配置HttpRequestHandlerAdapter适配器 用来处理实现了HttpRequestHandler后端控制类Controller-->  
        <bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter"></bean>

2.自定义Controller

public class HtppController implements HttpRequestHandler{

    public void handleRequest(HttpServletRequest request, HttpServletResponse respone) throws ServletException, IOException {
        request.setAttribute("hello", "sprinmvc,又见面了!");
        request.getRequestDispatcher("/WEB-INF/jsps/index.jsp").forward(request, respone);
    }

}

3.将自定义的Controller交给spring管理

<bean name="/htppController.do" class="com.study.controller.HtppController"></bean>

4.jsp页面显示结果

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>springmvc</title>
</head>
<body>
    ${hello }
</body>
</html>


注:两个处理器适配器是可以共存的.

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