Spring MVC实例，使用Controller接口实现控制器
2017-07-27 11:12
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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);
@Override
public 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);
@Override
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
logger.info("SaveProductController called");
ProductForm productForm = new ProductForm();
//product action properties
productForm.setName(request.getParameter("name"));
productForm.setDescription(request.getParameter("description"));
productForm.setPrice(request.getParameter("price"));
//create model
Product 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 Product
System.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。
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);
@Override
public 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);
@Override
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
logger.info("SaveProductController called");
ProductForm productForm = new ProductForm();
//product action properties
productForm.setName(request.getParameter("name"));
productForm.setDescription(request.getParameter("description"));
productForm.setPrice(request.getParameter("price"));
//create model
Product 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 Product
System.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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