Spring的MVC模型运行序列分析

    技术2022-05-11  11

    1)假定你的请求为http://localhost:8080/springapp/index.jsp2)为安全考虑,在index.jsp中将请求redirect到WEB-INF目录下:  3)在web.xml中,对*.htm的请求都发到org.springframework.web.servlet.DispatcherServlet进行处理:

          springapp     org.springframework.web.servlet.DispatcherServlet     1  

          springapp     *.htm   4)org.springframework.web.servlet.DispatcherServlet会获取当前应用名称apringapp,并自动到WEB-INF目录下寻找并解析springapp-servlet.xml文件.5)在springapp-servlet.xml文件中,将/hello.htm转发到springappController                                     springappController                     6)在springapp-servlet.xml文件中,配置springappController对应的类文件                             7)实现你自己的控制器类web.SpringappController,举例如下:package web;

    import org.springframework.web.servlet.mvc.Controller;import org.springframework.web.servlet.ModelAndView;

    import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;

    import java.io.IOException;import java.util.Map;import java.util.HashMap;

    import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;

    import bus.Product;import bus.ProductManager;

    public class SpringappController implements Controller {

        /** Logger for this class and subclasses */    protected final Log logger = LogFactory.getLog(getClass());

        private ProductManager prodMan;

        public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {

            String now = (new java.util.Date()).toString();        logger.info("returning hello view with " + now);

            Map myModel = new HashMap();        myModel.put("now", now);        myModel.put("products", getProductManager().getProducts());

            return new ModelAndView("hello", "model", myModel);    }

        public void setProductManager(ProductManager pm) {        prodMan = pm;    }

        public ProductManager getProductManager() {        return prodMan;    }}注意,控制器中采用了IOC模式的type2方式.8)你返回的ModelAndView有三个参数,第一个是下个view的名称,第二个是Model Object的别名,第三个是Model Object对象,后两个参数将在下个VIEW中使用.


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