初识springmvc

实现步骤：

新建一个web项目导入相关jar包编写web.xml，注册dispatcherrvlet编写springmvc配置文件接下来就是去创建对应的控制类 , controller最后完善前端视图和controller之间的对应测试运行调试

使用springmvc必须配置的三大件：

处理器映射器、处理器适配器、视图解析器

通常，我们只需要手动配置视图解析器，而处理器映射器和处理器适配器只需要开启注解驱动即可，而省去了大段的xml配置

注解实现springmvc

常见注解

@component组件@rvice服务@controller控制@respositorydao层

控制器

package com.kuang.controller;import org.springframework.stereotype.controller;import org.springframework.ui.model;import org.springframework.web.bind.annotation.requestmapping;//@controller注解的类会自动添加到spring上下文中@controller@requestmapping("/test2")public class controllertest2{//映射访问路径@requestmapping("/t2")public string index(model model){//spring mvc会自动实电荷量的单位例化一个model对象用于向视图中传值model.addattribute("msg", "controllertest2");//返回视图位置return "test";}}

@controller是为了让spring ioc容器初始化时自动扫描到；@requestmapping是为了映射请求路径，这里因为类与方法上都有映射所以访问时应该是/test2/t2；

标准maven依赖

<?xml version="1.0" encoding="utf-8"?><project xmlns="http://maven.apache.org/pom/4.0.0"         xmlns:xsi="/d/file/titlepic/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.reliable</groupid>    <artifactid>springmvc2</artifactid>    <packaging>pom</packaging>    <version>1.0-snapshot</version>    <modules>        <module>springmvc-04-controller</m五年级数学题odule>    </modules>    <dependencies>        <dependency>            <groupid>junit</groupid>            <artifactid>junit</artifactid>            <version>4.12</version>        </dependency>        <dependency>            <groupid>org.springframework</groupid>            <artifactid>spring-webmvc</artifactid>            <version>5.1.9.relea</version>        </dependency>        <dependency>            <groupid>javax.rvlet</groupid>            <artifactid>rvlet-api</artifactid>            <version>2.5</version>        </dependency>        <dependency>            <groupid>javax.rvlet.jsp</groupid>            <artifactid>jsp-api</artifactid>            <version>2.2</version>        </dependency>        <dependency>            <groupid>javax.rvlet</groupid>            <artifactid>jstl</artifactid>            <version>1.2</version>        </dependency>    </dependencies>    <build>        <resources>            <resource>                <directory>src/main/java</directory>                <includes>                    <include>**/*.properties</include>                    <include>**/*.xml</include>                </includes>                <filtering>fal</filtering>            </秋天的日记50字resource>            <resource>                <directory>src/main/resources</directory>                <includes>                    <include>**/*.properties</include>                    <include>**/*.xml</include>                </includes>                <filtering>fal</filtering>            </resource>        </resources>    </build></project>

一、配置pom.xml

<?xml version="1.0" encoding="utf-8"?><project xmlns="http://maven.apache.org/pom/4.0.0"         xmlns:xsi="/d/file/titlepic/xmlschema-instance"         xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactid>springmvc2</artifactid>        <groupid>com.reliable</groupid>        <version>1.0-snapshot</version>    </parent>    <modelversion>4.0.0</modelversion>    <artifactid>springmvc-04-controller</artifactid>    <dependencies>        <dependency>            <groupid>javax.rvlet</groupid>            <artifactid>rvlet-api</artifactid>            <version>2.5</version>        </dependency>        <dependency>            <groupid>javax.rvlet.jsp</groupid>            <artifactid>jsp-api</artifactid>            <version>2.2</version>        </dependency>    </dependencies>    <build>        <resources>            <resource>                <directory>src/main/java</directory>                <includes>                    <include>**/*.properties</include>                    <include>**/*.xml</include>                </includes>                <filtering>fal</filtering>   火腿玉米浓汤         </resource>            <resource>                <directory>src/main/resources</directory>                <includes>                    <include>**/*.properties</include>                    <include>**/*.xml</include>                </includes>                <filtering>fal</filtering>            </resource>        </resources>    </build></project>

二、配置web.xml

<?xml version="1.0" encoding="utf-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"         xmlns:xsi="/d/file/titlepic/xmlschema-instance"         xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"         version="4.0">    <!--1.注册rvlet-->    <rvlet>        <rvlet-name>springmvc</rvlet-name>        <rvlet-class>org.springframework.web.rvlet.dispatcherrvlet</rvlet-class>        <!--通过初始化参数指定springmvc配置文件的位置，进行关联-->        <init-param>            <param-name>contextconfiglocation</param-name>            <param-value>classpath:springmvc-rvlet.xml</param-value>        </init-param>        <!-- 启动顺序，数字越小，启动越早 -->        <load-on-startup>1</load-on-startup>    </rvlet>    <!--所有请求都会被springmvc拦截 -->    <rvlet-mapping>        <rvlet-name>springmvc</rvlet-name>        <url-pattern>/</url-pattern>    </rvlet-mapping></web-app>

三、配置springmvc-rvlet.xml

<?xml version="1.0" encoding="utf-8"?><beans xmlns="/d/file/titlepic/"       xmlns:xsi="/d/file/titlepic/xmlschema-instance"       xmlns:context="/d/file/titlepic/"       xmlns:mvc="/d/file/titlepic/"       xsi:schemalocation="http://www.springframework.org/schema/beans        /d/file/titlepic/spring-beans.xsd        http://www.springframework.org/schema/context        /d/file/titlepic/spring-context.xsd        http://www.springframework.org/schema/mvc        https://www.springframework.org/schema/mvc/spring-mvc.xsd">    <!-- 自动扫描包，让指定包下的注解生效,由ioc容器统一管理 -->    <context:component-scan ba-package="com.kuang.controller"/>    <!-- 让spring mvc不处理静态资源：html 等-->    <mvc:default-rvlet-handler/>    <!--    支持mvc注解驱动        在spring中一般采用@requestmapping注解来完成映射关系        要想使@requestmapping注解生效        必须向上下文中注册defaultannotationhandlermapping        和一个annotationmethodhandleradapter实例        这两个实例分别在类级别和方法级别处理。        而annotation-driven配置帮助我们自动完成上述两个实例的注入。<mvc:annotation-driven /> 完成了映射和适配（支持用注解完成）     -->    <mvc:annotation-driven />    <!-- 视图解析器 -->    <bean class="org.springframework.web.rvlet.view.internalresourceviewresolver"          id="internalresourceviewresolver">        <!-- 前缀 -->        <property 康复治疗学专业name="prefix" value="/web-inf/jsp/" />        <!-- 后缀 -->        <property name="suffix" value=".jsp" />    </bean></beans>

restful 风格

概念
restful就是一个资源定位及资源操作的风格。不是标准也不是协议，只是一种风格。基于这个风格设计的软件可以更简洁，更有层次，更易于实现缓存等机制。

功能
资源：互联网所有的事物都可以被抽象为资源
资源操作：使用post、delete、put、get，使用不同方法对资源进行操作。
分别对应 添加、 删除、修改、查询。

restfulcontroller(@pathvariable)

package com.kuang.controller;import org.springframework.stereotype.controller;import org.springframework.ui.model;import org.springframework.web.bind.annotation.pathvariable;import org.springframework.web.bind.annotation.requestmapping;import org.springframework.web.bind.annotation.requestmethod;@controllerpublic class restfulcontroller {//映射访问路径@requestmapping("/commit/{p1}/{p2}")public string index(@pathvariable int p1, @pathvariable int p2, model model){int result = p1+p2;//spring mvc会自动实例化一个model对象用于向视图中传值model.addattribute("msg", "结果："+result);//返回视图位置return "test";}//映射访问路径,必须是get请求@requestmapping(value = "/hello",method = {requestmethod.get})public string index2(model model){model.addattribute("msg", "hello!");return "test";}}

使用method属性指定请求类型

用于约束请求的类型，可以收窄请求范围。指定请求谓词的类型如get, post, head, options, put, patch, delete, trace等。

//映射访问路径,必须是get请求@requestmapping(value = "/hello",method = {requestmethod.get})public string index2(model model){model.addattribute("msg", "hello!");return "test";}

除了添加method，还可以使用注解

@getmapping
@postmapping
@putmapping
@deletemapping
@patchmapping

//映射访问路径,必须是get请求@getmapping(value = "/hello")public string index2(model model){model.addattribute("msg", "hello!");return "test";}