|
三层架构
??表现层：WEB层，用来和客户端进行数据交互的
? ?业务层：处理公司具体的业务逻辑的
? ?持久层：用来操作数据库的
?MVC
??model（模型）：数据模型，Javabean的类，用来进行数据封装
? view（视图）：指JSP、HTML用来展示数据给用户
? controller（控制器）：用来接受用户的请求，整个流程的控制器。用来进行数据校验
配置mvc
xml方式
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>1.0-SNAPSHOT</version>
<name>demo</name>
<packaging>war</packaging>
<properties>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<junit.version>5.7.0</junit.version>
<spring.version>5.2.5.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<!--Spring核心基础依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- 增加了切面 -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.5</version>
</dependency>
<!-- spring jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<!--spring mvc-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<!--日志相关-->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!--测试相关-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.12</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.0</version>
</plugin>
</plugins>
</build>
</project>
web.xml配置分发器
<servlet>
<!-- 设置所有请求拦截到分发器
第一种 如果SpringMVC的配置文件,和web.xml在同一个目录
比如 MVC配置文件名字叫 basic-servlet.xml
只需要把servlet-name的值 设置为basic就可以,
但是 MVC配置文件的名字必须是xxx-servlet.xml的格式 -->
<servlet-name>basic</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 指定配置文件-->
<!-- <init-param> -->
<!-- <param-name>contextConfigLocation</param-name> -->
<!-- 可以放在任何地方 -->
<!-- <param-value>/a/b/c/d/xxxxxxxxx.xml</param-value> -->
<!-- 放在src下 -->
<!-- <param-value>classpath:xxxxxxxxx.xml</param-value> -->
<!-- </init-param> -->
<!-- 项目启动就会加载这个servlet -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>basic</servlet-name>
<url-pattern>/</url-pattern>
<!--
/* 会拦截jsp文件
/ 不会拦截jsp
-->
</servlet-mapping>
因为取名是basic，所以叫basic-servlet.xml,与web.xml在同级
<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"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">
<!-- 使用XML进行映射
MVC框架基本两个点
1 url怎么映射进去进行处理
2 处理完如何找到视图
-->
<!-- 处理映射器配置-->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
<!-- 创建映射,配置映射器,name必须是 / 打头-->
<bean name="/welcome" class="com.example.SpringMVC.controller.XmlMappingController"/>
<!-- 视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
分发器跳转到comtroller，return回名叫welcome的jsp页面
public class XmlMappingController extends AbstractController {
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
System.out.println("Welcome~");
return new ModelAndView("welcome");
}
}
注解的方式
<?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:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">
<context:component-scan base-package="com.tledu.zrz.springmvc.controller"/>
<mvc:annotation-driven />
<!--视图解析器 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix"value="/WEB-INF/jsp/"/>
<property name="suffix"value=".jsp"/>
</bean>
</beans>
- 配置包扫描，需要能把controller放到spring容器管理
- 添加一个Controller类，并加上Controller注解
- 类上加@RequestMapping("")，配置地址和controller的映射关系
- 在方法上加@RequestMapping("")，配置地址和方法的映射关系
? ?@Controller注解
? ? 具备@component
? ? return一个string类型的字符串，被视图解析器解析
? @RequestMapping("/welcome")
? ? 写在类上，一级路径
? ? 写在方法上，二级路径
? @RequestBody
? ? ?限制前端必须传递JSON格式。否则报错request body is missing
? @ResponseBody
跳过视图解析器解析，返回自定义的内容
? @?RequestParam
? ? ?当前后端key值不一致时，用来定义匹配的规则
? @PathVariable
? ? ?获取地址栏的动态参数
?自定义类型转化器
? 创建一个类，实现Converter接口，复写方法
? ?注册该类型转化器，在spring的配置文件
<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
<property name="converters">
<set>
<bean class="com.tledu.springMVC2.converter.StringToDateConverter"/>
</set>
</property>
</bean>
|