实现SpringMVC注解以及分析DispatcherServl

作者: JaJa大宝剑 | 来源:发表于2017-11-24 18:56 被阅读0次

实现SpringMVC注解以及分析DispatcherServl
Spring - MVC执行流程
SpringMVC源码系列：HandlerMapping
SpringMVC+MyBatis事务不回滚问题的解决办法
SpringMVC干货系列：从零搭建SpringMVC+myba
springmvc源码分析-初始化DispatcherServl
DispatcherServlet初始化过程
数据访问
12 手写SpringMVC
springMvc执行流程

现在我会贴代码了，首先贴上第一篇文章的代码

pom.xml，辛辛苦苦搬了好久的Spring全家桶导入maven

    <!--这个参数用于统一配备Spring的版本-->
    <properties>
        <spring.version>4.2.0.RELEASE</spring.version>
    </properties>
    <!--需要用到的编译插件-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <!--依赖-->
    <dependencies>
        <!-- https://mvnrepository.com/artifact/aopalliance/aopalliance -->
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context-support -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-expression -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-instrument -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-instrument</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-instrument-tomcat -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-instrument-tomcat</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jms -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jms</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-messaging -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-messaging</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-orm -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-oxm -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-oxm</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-test -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-websocket -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-websocket</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>


    </dependencies>

web.xml中的代码

<servlet>
        <!--Servlet的名称-->
        <servlet-name>dispatcher</servlet-name>
        <!--Servlet对应的java类-->
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <!--web应用启动时立即加载Servlet-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!--Servlet的映射声明-->
    <servlet-mapping>
        <!--对应Servlet的名称-->
        <servlet-name>dispatcher</servlet-name>
        <!--标识监听当前的所有请求-->
        <url-pattern>/</url-pattern>
    </servlet-mapping>

ControllerTest.java

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Created by Administrator on 2017/11/23 0023.
 */
public class ControllerTest implements Controller{
    @Override
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {

        System.out.println("handleRequest被调用");
        //1、收集参数、验证参数
        //2、绑定参数到命令对象
        //3、将命令对象传入业务对象进行业务处理
        //4、选择下一个页面
        ModelAndView mv = new ModelAndView();
        //添加模型数据 可以是任意的POJO对象
        mv.addObject("message", "Hello World!");
        //设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
        mv.setViewName("/WEB-INF/jsp/hello.jsp");
        System.out.println("到了return");
        return mv;
    }
}

mvc-dispatcher-servlet.xml放在后面了

接着，要完成上一个文章的注解实现

基于上一篇文章中的项目，修改mvc-dispatcher-servlet.xml文件
做法是注释之前的bean，改为如下：

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--&lt;!&ndash; HandlerMapping 处理器将bean的name作为URL进行查找，需要在配置handle是指定name&ndash;&gt;-->
    <!--<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>-->

    <!--&lt;!&ndash; HandlerAdapter 所有处理适配器都要实现HandleAdapter接口&ndash;&gt;-->
    <!--<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>-->
    <!--&lt;!&ndash;视图解析器&ndash;&gt;-->
    <!--<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"/>-->

    <!--&lt;!&ndash;将其添加到Spring配置文件(WEB-INF/chapter2-servlet.xml)，让其接受Spring IoC容器管理:&ndash;&gt;-->
    <!--<bean name="/" class="pers.congcong.controller.ControllerTest"/>-->

    <!--使用注释控制器-->
    <!--sping自动会扫描base-package下面的包或者子包下面的java文件-->
    <context:component-scan base-package="pers.congcong.controller"/>
    <!--配置annotation类型的处理映射器-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
    <!--配置annotation类型的处理器适配器-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"/>
</beans>

然后在pers.congcong.controllers包中新建一个HelloTestController类：

  package pers.congcong.controller;

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

/**
 * Created by Administrator on 2017/11/24 0024.
 */
@Controller
public class HelloController {

    @RequestMapping(value = "/hello")
    public ModelAndView hello(){
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("/WEB-INF/jsp/hello.jsp");
        return modelAndView;
    }
}

然后点运行

点运行

然后就OJBK了

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