Controller控制器,是MVC中的部分C,为什么是部分呢?因为此处的控制器主要负责功能处理部分:
1、收集、验证请求参数并绑定到命令对象;
2、将命令对象交给业务对象,由业务对象处理并返回模型数据;
3、返回ModelAndView(Model部分是业务对象返回的模型数据,视图部分为逻辑视图名)。
DispatcherServlet,主要负责整体的控制流程的调度部分:
1、负责将请求委托给控制器进行处理;
2、根据控制器返回的逻辑视图名选择具体的视图进行渲染(并把模型数据传入)。
因此MVC中完整的C(包含控制逻辑+功能处理)由(DispatcherServlet+Controller)组成。
因此此处的控制器是WebMVC中部分,也可以称为页面控制器、动作、处理器。
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,Javaform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
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<? 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 >
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2)springmvc-servlet,默认方式的DispatcherServlet配置。
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<? 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 >
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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
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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" );
}
}
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2)SaveProductController.java,保存用户输入的Product信息并返回
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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);
}
}
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3.JSP界面,包括两个,ProductForm和ProductDetails
1)ProductForm.jsp
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<%@ 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 >
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2)ProductDetails.jsp
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<%@ 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 >
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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。。
总结
以上就是本文关于SpringMVC编程使用Controller接口实现控制器的全部内容,希望对大家有所帮助。如有不足之处,欢迎留言指出。
原文链接:http://blog.csdn.net/qq_28379809/article/details/76177343