Spring MVC实例，使用Controller接口实现控制器

来源：互联网发布：北京市网络职业学院编辑：程序博客网时间：2024/06/14 13:42

之前用注解的方式实现了控制器，现在换了一种，通过实现了Controller接口的Controller类来实现处理请求的作用。

主要包括：XML配置文件，Java普通类，Java form类，Controller类，和JSP界面

1.首先是XML配置文件，包括了web.xml和springmvc-servlet.xml。代码如下：

1）web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  <servlet>    <servlet-name>springmvc</servlet-name>    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>    <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>    <servlet-name>springmvc</servlet-name>    <url-pattern>/</url-pattern>  </servlet-mapping></web-app>

2）springmvc-servlet，默认方式的DispatcherServlet配置。

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><bean name="/product_input.action" class="controller.InputProductController" /><bean name="/product_save.action" class="controller.SaveProductController" />    <bean id="viewResolver"class="org.springframework.web.servlet.view.InternalResourceViewResolver">  <property name="prefix" value="/WEB-INF/jsp/" />  <property name="suffix" value=".jsp" /></bean></beans>

2.Controller类，包括两个，一个用于打开首页，一个用于处理用户输入并返回

1）InputProductController.java

package controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.Controller;public class InputProductController implements Controller{private static final Log logger = LogFactory.getLog(InputProductController.class);@Overridepublic ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {logger.info("InputProductController called");return new ModelAndView("ProductForm");}}

2）SaveProductController.java，保存用户输入的Product信息并返回

package controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.Controller;import domain.Product;import form.ProductForm;public class SaveProductController implements Controller{private static final Log logger = LogFactory.getLog(SaveProductController.class);@Overridepublic ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {logger.info("SaveProductController called");ProductForm productForm = new ProductForm();//product action propertiesproductForm.setName(request.getParameter("name"));productForm.setDescription(request.getParameter("description"));productForm.setPrice(request.getParameter("price"));//create modelProduct product = new Product();product.setName(productForm.getName());product.setDescription(productForm.getDescription());try {product.setPrice(Float.parseFloat(productForm.getPrice()));}catch(NumberFormatException e) {}//insert code to save ProductSystem.out.println("返回视图");return new ModelAndView("ProductDetails","product",product);}}

3.JSP界面，包括两个，ProductForm和ProductDetails

1)ProductForm.jsp

<%@ 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=UTF-8"><title>Insert title here</title></head><body><div id="global"><form action="product_save.action" method="post">  <fieldset>    <legend>Add a product</legend>    <label for="name">Product Name: </label>    <input type="text" id="name" name="name" value="" tabindex="1">    <label for="description">Description: </label>    <input type="text" id="description" name="description" tabindex="2">    <label for="price">Price: </label>    <input type="text" id="price" name="price" tabindex="3">    <div id="buttons">      <label for="dummy"></label>      <input id="reset" type="reset" tabindex="4">      <input id="submit" type="submit" tabindex="5" value="Add Product">    </div>  </fieldset></form></div></body></html>

2)ProductDetails.jsp

<%@ 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=UTF-8"><title>Insert title here</title></head><body><div id="global">  <h4>The product has been saved.</h4>  <p>     <h5>Details:</h5>     Product Name: ${product.name} <br />     Description:  ${product.description}<br />     Price: $${product.price}  </p></div></body></html>

好了，代码部分已经齐全了，启动server之后，输入URL：http://localhost:8080/SpringSimple/product_input.action;就可以看到首页了。

注：配置文件和Controller类返回的视图中文件的位置必须要小心。。博主搞了半个小时才弄明白问题出在那里。

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