springMvc(一)

SpringMvc

1. 核心：DispatcherServlet

1.1作用：负责拦截请求并分派给相应的处理器处理

1.2配置DispatcherServlet（web.xml）

2.配置处理器映射器，适配器，视图解析器等

3.编写Handler类

2.1实现Controller接口，对应上面配置的第一种适配器

2.2实现HttpRequestHandler接口，对应上面配置的第二种适配器

4.注解开发

4.1 spring3.1之前的映射器和适配器的配置类

（1）映射器org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping

（2）适配器org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter

4.2 spring3.1之后的映射器和适配器的配置类

（1）映射器org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping

（2）适配器org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter

（3）使用<mvc:annotation-driven></mvc:annotation-driven>可以替代上面两个

4.3 扫描Handler类，开启组件扫描，方便快捷，只要配置包名

4.4 编写Handler类

（1）      在类名上使用@Controller注解类

（2）      使用@RequestMapping()配置映射url

5.配置等相关文件

5.1pom.xml

 <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

         <!-- log4j日志包版本号 -->
         <slf4j.version>1.7.18</slf4j.version>
         <log4j.version>1.2.17</log4j.version>

     </properties>

     <dependencies>
     <!-- 添加fastjson -->
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>fastjson</artifactId>
             <version>1.1.41</version>
         </dependency>

         <!-- 添加日志相关jar包 -->
         <dependency>
             <groupId>log4j</groupId>
             <artifactId>log4j</artifactId>
             <version>${log4j.version}</version>
         </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
             <version>${slf4j.version}</version>
         </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-log4j12</artifactId>
             <version>${slf4j.version}</version>
         </dependency>

         <!-- log end -->
         <!-- 映入JSON -->
         <dependency>
             <groupId>org.codehaus.jackson</groupId>
             <artifactId>jackson-mapper-asl</artifactId>
             <version>1.9.13</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-core</artifactId>
             <version>2.8.0</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
             <version>2.8.0</version>
         </dependency>

         <dependency>
             <groupId>commons-fileupload</groupId>
             <artifactId>commons-fileupload</artifactId>
             <version>1.3.1</version>
         </dependency>

         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
             <version>2.4</version>
         </dependency>

         <dependency>
             <groupId>commons-codec</groupId>
             <artifactId>commons-codec</artifactId>
             <version>1.9</version>
         </dependency>

     <!-- 添加jstl依赖 -->
         <dependency>
             <groupId>jstl</groupId>
             <artifactId>jstl</artifactId>
             <version>1.2</version>
         </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
             <version>3.8.1</version>
             <scope>test</scope>
         </dependency>
         <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-webmvc</artifactId>
             <version>4.3.14.RELEASE</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
         <dependency>
             <groupId>javax.servlet</groupId>
             <artifactId>javax.servlet-api</artifactId>
             <version>3.1.0</version>
             <scope>provided</scope>
         </dependency>

     </dependencies>

pom.xml

5.2log4j.properties

 # \u65E5\u5FD7\u6536\u96C6\u5668\u7684\u64CD\u4F5C
 log4j.rootLogger=DEBUG, stdout, file

 # \u5C06\u65E5\u5FD7\u4FE1\u606F\u5B9A\u5411\u5230\u63A7\u5236\u53F0
 log4j.appender.stdout=org.apache.log4j.ConsoleAppender
 log4j.appender.stdout.Target=System.out
 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
 log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{}:%L - %m%n

 # \u5C06\u65E5\u5FD7\u4FE1\u606F\u5B9A\u5411\u5230\u6587\u4EF6\u4E2D
 log4j.appender.file=org.apache.log4j.RollingFileAppender
 log4j.appender.file.File=D:/log/springmvc-01/log4j-application.log
 log4j.appender.file.MaxFileSize=5MB
 log4j.appender.file.MaxBackupIndex=10
 log4j.appender.file.layout=org.apache.log4j.PatternLayout
 log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{}:%L - %m%n

log4j

5.3springmvc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
     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/mvc
         http://www.springframework.org/schema/mvc/spring-mvc.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd">
         <bean id="userController" name="/home" class="com.jnxj.springmvc.controller.UserController"></bean>
         <bean id="userController2" class="com.jnxj.springmvc.controller.UserController2"></bean>
         <bean class="com.jnxj.springmvc.controller.UserController3"></bean>
         <!-- 开启组件扫描，不用一个一个配置handler -->
         <context:component-scan base-package="com.jnxj.springmvc.controller"></context:component-scan>
         <!-- 处理器映射器  通过bean的name去处理url-->
         <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
            <!-- 另一种非注解处理器映射器 -->
            <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
                    <property name="mappings">
                        <props>
                            <prop key="/home1">userController</prop>
                            <prop key="/home2">userController2</prop>
                        </props>
                    </property>
            </bean>

            <!-- 注解的映射器 -->
            <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
         <!-- 注解适配器 -->
         <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"></bean>

         <!-- 使用下面这个可以代替上面两个注解映射器和适配器
             默认加载很多方法，比如json的视图解析器
         -->
        <!--  <mvc:annotation-driven></mvc:annotation-driven> -->
         <!-- 处理器适配器 ,实现HandlerAdapter接口-->
         <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
         <!-- 另一种处理器适配器 ,实现HttpRequestHandler接口-->
         <bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter"></bean>

         <!-- 视图解释器 -->
         <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>
         </beans>

springmvc.xml