springMVC学习-自定义适配器

自定义适配器
一般情况下,springMVCSimpleControllerHandlerAdapter会是我们常用的适配器,也是SpringMVC中默认的适配器,该适配器中的主要代码如下:

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);
}
}

从代码中可以看出,它首先会判断我们的handler是否实现了Controller接口,如果实现了,那么会调用Controller接口中的handleRequest方法
那么根据这种方式能看出,我们也可以有自己的适配器的实现,那么就可以让任意类成为SpringMVC中的handler了,无论我们的类是否实现了Controller接口

例如:
自己的接口:

public interface MyHandler {
public ModelAndView handler_test(HttpServletRequest request, HttpServletResponse response)throws Exception;
}
自己的适配器:
public class MyHandlerAdapter implements HandlerAdapter{
@Override
public boolean supports(Object handler) {
return (handler instanceof MyHandler);
}

@Override
public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
return ((MyHandler)handler).handler_test(request, response);
}

@Override
public long getLastModified(HttpServletRequest request, Object handler) {
return -1L;
}

}

自己的hander:(就是我们之前写的Controller)
public class TestController implements MyController{
@Override
public ModelAndView handler_test(HttpServletRequest request, HttpServletResponse response) throws Exception {
String name = request.getParameter("name");
ModelAndView mv = new ModelAndView("hello");
mv.addObject("name", name);
return mv;
}
}

最后在spring的配置中把我们的适配器进行配置即可正常使用.