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SpringMVC框架第一天
第一章:三层架构和MVC
<properties>
<spring.version>5.0.2.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<!-- SpringMVC的核心控制器 -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servletclass>
<!-- 配置Servlet的初始化参数,读取springmvc的配置文件,创建spring容器 -->
<init-param>
1. index.jsp
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<!-- 配置servlet启动时加载对象 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置spring创建容器时要扫描的包 -->
<context:component-scan base-package="com.itheima"></context:component-scan>
<!-- 配置视图解析器 -->
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!-- 配置spring开启注解mvc的支持
<mvc:annotation-driven></mvc:annotation-driven>-->
</beans>
<body>
<h3>入门案例</h3>
<a href="${ pageContext.request.contextPath }/hello">入门案例</a>
</body>
package cn.itcast.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* 控制器
* @author rt
*/
@Controller
public class HelloController {
/**
* 接收请求
* @return
*/
@RequestMapping(path="/hello")
public String sayHello() {
System.out.println("Hello SpringMVC!!");
return "success";
}
}
<body>
<h3>入门成功!!</h3>
</body>
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filterclass>
<!-- 指定字符集 -->
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
package cn.itcast.utils;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.core.convert.converter.Converter;
/**
* 把字符串转换成日期的转换器
* @author rt
*/
public class StringToDateConverter implements Converter<String, Date>{
/**
* 进行类型转换的方法
*/
public Date convert(String source) {
// 判断
if(source == null) {
throw new RuntimeException("参数不能为空");
}
2. 注册自定义类型转换器,在springmvc.xml配置文件中编写配置
7. 在控制器中使用原生的ServletAPI对象
1. 只需要在控制器的方法参数定义HttpServletRequest和HttpServletResponse对象
第四章:常用的注解
1. RequestParam注解
1. 作用:把请求中的指定名称的参数传递给控制器中的形参赋值
2. 属性
1. value:请求参数中的名称
2. required:请求参数中是否必须提供此参数,默认值是true,必须提供
3. 代码如下
try {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
// 解析字符串
Date date = df.parse(source);
return date;
} catch (Exception e) {
throw new RuntimeException("类型转换错误");
}
}
}
<!-- 注册自定义类型转换器 -->
<bean id="conversionService"
class="org.springframework.context.support.ConversionServiceFactoryBean">
<property name="converters">
<set>
<bean class="cn.itcast.utils.StringToDateConverter"/>
</set>
</property>