springMVC学习路线3-整合spring(annotion方式)

时间:2021-08-02 15:06:08

  个人认为使用框架并不是很难,关键要理解其思想,这对于我们提高编程水平很有帮助。不过,如果用都不会,谈思想就变成纸上谈兵了!!!先技术,再思想。实践出真知。

1.基本概念

1.1 Spring

    Spring是一个开源框架,Spring是于2003 年兴起的一个轻量级的Java 开发框架,由Rod Johnson 在其著作Expert One-On-One J2EE Development and Design中阐述的部分理念和原型衍生而来。它是为了解决企业应用开发的复杂性而创建的。Spring使用基本的JavaBean来完成以前只可能由EJB完成的事情。然而,Spring的用途不仅限于服务器端的开发。从简单性、可测试性和松耦合的角度而言,任何Java应用都可以从Spring中受益。 简单来说,Spring是一个轻量级的控制反转(IoC)和面向切面(AOP)的容器框架。

 1.2 SpringMVC

  Spring MVC属于SpringFrameWork的后续产品,已经融合在Spring Web Flow里面。Spring MVC 分离了控制器、模型对象、分派器以及处理程序对象的角色,这种分离让它们更容易进行定制。

2.环境搭建详解

2.1引入相应的包

springMVC学习路线3-整合spring(annotion方式)

2.2新建注解springAnnotion-servlet.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:p="http://www.springframework.org/schema/p"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  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
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

     <!-- 扫描指定包下的所有类 -->
     <context:component-scan base-package="com.juin.spring"/>
     <!-- 启用注解的两个bean -->
     <mvc:annotation-driven/>
     <!-- <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
     <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"></bean> -->
     <!-- 静态文件访问 -->
     <mvc:resources location="/img/" mapping="/img/**"/>
     <mvc:resources location="/js/" mapping="/js/**"/>
     <mvc:resources location="/css/" mapping="/css/**"/>

     <!-- 文件上传 -->
     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
           <property name="defaultEncoding" value="utf-8" />
           <property name="maxUploadSize" value="10485760000" />
           <property name="maxInMemorySize" value="40960" />
     </bean>

     <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
         <property name="prefix" value="/"></property>
         <property name="suffix" value=".jsp"></property>
     </bean>
  </beans>  

2.3 新建springxml文件 springAnnotation-core.xml

通过bean注入要调用的接口实现类

springAnnotion-core.xml
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd" [
 <!ENTITY contextInclude SYSTEM "org/springframework/web/context/WEB-INF/contextInclude.xml">
 ]>

 <beans>
     <bean id="springManager" class="com.juin.spring.springManager"/>
 </beans>


2.3.1 新建接口ISpring

package com.juin.spring;

public interface ISpring {
    public String get();
}

ISpring

2.3.2新建类springManager实现ISpring接口

 package com.juin.spring;

 public class springManager implements ISpring {

     @Override
     public String get() {
         System.out.println("i am geting");
         return "I am getMethod";
     }

 }

接口实现类

2.3.3新建类springController

 package com.juin.spring;

 import javax.annotation.Resource;

 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;

 @Controller
 public class springController {

     @Resource(name="springManager")
     private ISpring springManager;

     @RequestMapping("/spring/get")
     public String get(){
         System.out.println(springManager.get());
         return "/success";
     }
 }

springController

2.4配置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"
     version="3.0">
     <display-name>SpringMVC01</display-name>
     <welcome-file-list>
         <welcome-file>index.html</welcome-file>
         <welcome-file>index.htm</welcome-file>
         <welcome-file>index.jsp</welcome-file>
         <welcome-file>default.html</welcome-file>
         <welcome-file>default.htm</welcome-file>
         <welcome-file>default.jsp</welcome-file>
     </welcome-file-list>
     <!--集成spring -->
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath*:config/springAnnotation-core.xml</param-value>
     </context-param>
     <listener>
         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
     </listener>

     <!-- springMVC配置 -->
     <servlet>
         <servlet-name>springMVC</servlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
         <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>classpath*:config/springAnnotation-servlet.xml</param-value>
         </init-param>
         <load-on-startup>1</load-on-startup>
     </servlet>
     <servlet-mapping>
         <servlet-name>springMVC</servlet-name>
         <url-pattern>/</url-pattern>
     </servlet-mapping>

     <!-- 字符过滤器 -->
     <filter>
         <filter-name>encodingFilter</filter-name>
         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
         <init-param>
             <param-name>encoding</param-name>
             <param-value>UTF-8</param-value>
         </init-param>
         <init-param>
             <param-name>forceEncoding</param-name>
             <param-value>true</param-value>
         </init-param>
     </filter>
     <filter-mapping>
         <filter-name>encodingFilter</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>
 </web-app>

web.xml

注解:springMVC是通过dispastservlet来监听的,spring使用linstener监听的,他们之间的启动顺序,web容器有又一个即,

第一:context-param

第二:Listerer

第三:Filter

第四:servlet

这样的启动顺序是有一定联系的

总结

一张图胜过千言万语哈!

springMVC学习路线3-整合spring(annotion方式)