1.采用Spring MVC的好处

Dispathcher Servlet必须做如下的事情：

1.根据URI调用相应的action

2.实例化正确的控制器类

3.根据请求参数值来构造表单bean

3.调用控制器对象的相应方法

4.转向到一个视图（JSP页面）

 

SpringMVC提供了Dispatcher Servlet

使用基于XML的配置文件，实例化控制器

自动绑定用户输入，正确转换数据类型

可以校验用户输入，支持国际化和本地化，

支持多种视图

 

2.SpringMVC的DispatcherServlet

相当于调度员Servlet

配置部署：

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load-on-startup 如存在，在程序启动时加载， 如不存在，在一个请求时候加载 springMVC的配置文件，可以放在WEB-INF下 也可以放在任何地方，用init-param加载该文件

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3.Controller接口(传统风格控制器，要实现Controller接口) 2.5以前开发控制的唯一方法是org.springframework.web.servlet.mvc.Controller接口 只有一个方法handleRequest，而他的实现类只能处理一个单一动作Action  1 ModelAndView handleRequest(HttpServletRequest request,HttpServletResponse response)  而基于注解的控制器可以控制多个动作，无需实现任何接口 4.SpringMVC第一个应用 1.目录结构 spring-webmvc-x.y.z.jar包括了 DispatcherServlet

2.部署描述符文件和SpringMVC配置文件

2.1 部署文件

没有init-param，所以放在WEB-INF下

<url-pattern>/</url-pattern> 将所有的URL映射到该Servlet上

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2.2 SpringMVC的配置文件

2个控制器类

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3.Controller

1 package app03a.controller; 2  3 import javax.servlet.http.HttpServletRequest; 4 import javax.servlet.http.HttpServletResponse; 5  6 import org.apache.commons.logging.Log; 7 import org.apache.commons.logging.LogFactory; 8 import org.springframework.web.servlet.ModelAndView; 9 import org.springframework.web.servlet.mvc.Controller;10 11 public class InputProductController implements Controller {12 13     private static final Log logger = LogFactory14             .getLog(InputProductController.class);15 16     @Override17     public ModelAndView handleRequest(HttpServletRequest request,18             HttpServletResponse response) throws Exception {19         logger.info("InputProductController called");20         return new ModelAndView("/WEB-INF/jsp/ProductForm.jsp");21     }22 23 }

 

1 package app03a.controller; 2  3 import javax.servlet.http.HttpServletRequest; 4 import javax.servlet.http.HttpServletResponse; 5  6 import org.apache.commons.logging.Log; 7 import org.apache.commons.logging.LogFactory; 8 import org.springframework.web.servlet.ModelAndView; 9 import org.springframework.web.servlet.mvc.Controller;10 11 import app03a.domain.Product;12 import app03a.form.ProductForm;13 14 public class SaveProductController implements Controller {15 16     private static final Log logger = LogFactory17             .getLog(SaveProductController.class);18 19     @Override20     public ModelAndView handleRequest(HttpServletRequest request,21             HttpServletResponse response) throws Exception {22         logger.info("SaveProductController called");23         ProductForm productForm = new ProductForm();24         // populate action properties25         productForm.setName(request.getParameter("name"));26         productForm.setDescription(request.getParameter("description"));27         productForm.setPrice(request.getParameter("price"));28 29         // create model30         Product product = new Product();31         product.setName(productForm.getName());32         product.setDescription(productForm.getDescription());33         try {34             product.setPrice(Float.parseFloat(productForm.getPrice()));35         } catch (NumberFormatException e) {36         }37 38         // insert code to save Product39 40         return new ModelAndView("/WEB-INF/jsp/ProductDetails.jsp", "product",41                 product);//路径，模型名称，模型42     }43 44 }

 

1 package app03a.form; 2  3 public class ProductForm { 4     private String name; 5     private String description; 6     private String price; 7  8     public String getName() { 9         return name;10     }11     public void setName(String name) {12         this.name = name;13     }14     public String getDescription() {15         return description;16     }17     public void setDescription(String description) {18         this.description = description;19     }20     public String getPrice() {21         return price;22     }23     public void setPrice(String price) {24         this.price = price;25     }26 }

 

 

1 package app03a.domain; 2 import java.io.Serializable; 3  4 public class Product implements Serializable { 5     private static final long serialVersionUID = 748392348L; 6     private String name; 7     private String description; 8     private float price; 9 10     public String getName() {11         return name;12     }13     public void setName(String name) {14         this.name = name;15     }16     public String getDescription() {17         return description;18     }19     public void setDescription(String description) {20         this.description = description;21     }22     public float getPrice() {23         return price;24     }25     public void setPrice(float price) {26         this.price = price;27     }28 }

 

4.View

ProductForm.jsp

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Add a product
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14                 Product Name: 15                 17             
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19                 Description: 20                 22             
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24                 Price: 25                 27             
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ProductrDetails.jsp

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The product has been saved.
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Details:
12         Product Name: ${product.name}
      
13         Description: ${product.description}
      
14         Price: $${product.price}15     
      
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5.测试应用

 http://localhost:8080/app03a/product_input.action 

 

5.View Resolver

View Resolver负责配置视图解析器

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视图解析器配置了前缀和后缀两个属性：

view路径可以缩短，仅需提供myPage，无需在写/WEB-INF/jsp/myPage.jsp