6、测试HelloWorld

a>实现对首页的访问

在请求控制器中创建处理请求的方法

// @RequestMapping注解:处理请求和控制器方法之间的映射关系
//@RequestMapping注解的value属性可以通过请求地址匹配请求，/表示的当前工程的上下文路径  
// localhost:8080/springMVC/
@RequestMapping("/")
public String index(){
  //设置视图名称
  return "index";
}

HelloController

package com.atguigu.mvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloController {
    //"/"--》WEB-INF/templates/index.html
    @RequestMapping(value = "/")//value可以省略
    public String index(){
        //返回视图名称
        return "index";
    }
}

创建Tomcat

启动

b>通过超链接跳转到指定页面在主页index.html中设置超链接

HelloController

 @RequestMapping("/target")
    public String toTarget(){
        return "target";
    }

index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{target}">访问目标页面target.xml</a>
</body>
</html>

target.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
  <meta charset="UTF-8">
<title>Title</title>
</head>
<body>
HelloWorld
</body>
</html>

7、总结

浏览器发送请求，若请求地址符合前端控制器的url-pattern，该请求就会被前端控制器DispatcherServlet处理。前端控制器会读取SpringMVC的核心配置文件，通过扫描组件找到控制器，将请求地址和控制器中

@RequestMapping注解的value属性值进行匹配，若匹配成功，该注解所标识的控制器方法就是处理请求的方法。处理请求的方法需要返回一个字符串类型的视图名称，该视图名称会被视图解析器解析，加上前缀和后缀组成视图的路径，通过Thymeleaf对视图进行渲染，最终转发到视图所对应页面

复习HelloWorld

创建新模块

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.atguigu.mvc</groupId>
    <artifactId>springMVC_demo2</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
    </properties>
    <dependencies>
        <!--  SpringMVC      -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.1</version>
        </dependency>
        <!-- 日志   -->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
        </dependency>
        <!-- ServletAPI-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!-- Spring5和Thymeleaf整合包-->
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring5</artifactId>
            <version>3.0.12.RELEASE</version>
        </dependency>
    </dependencies>
</project>

创建webapp,添加web.xml

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/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">
    <!-- 注册前端控制器DispatcherServlet   -->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

resources/springMVC.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: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 https://www.springframework.org/schema/context/spring-context.xsd">
    <!--扫描组件    -->
    <context:component-scan base-package="com.atguigu.mvc.controller"></context:component-scan>
    <!--配置Thymeleaf视图解析器-->
    <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="order" value="1"/>
        <property name="characterEncoding" value="UTF-8"/>
        <property name="templateEngine">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
                        <!--视图前缀-->
                        <property name="prefix" value="/WEB-INF/templates/"/>
                        <!--视图后缀-->
                        <property name="suffix" value=".html"/>
                        <property name="templateMode" value="HTML5"/>
                        <property name="characterEncoding" value="UTF-8"/>
                    </bean>
                </property>
            </bean>
        </property>
    </bean>
</beans>

新建com.atguigu.mvc.controller.TestController类

package com.atguigu.mvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class TestController {
    @RequestMapping("/")
    public String index(){
        return "index";
    }
}

springMVC.xmll

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <!--扫描组件    -->
    <context:component-scan base-package="com.atguigu.mvc.controller"></context:component-scan>
    <!--配置Thymeleaf视图解析器-->
    <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="order" value="1"/>
        <property name="characterEncoding" value="UTF-8"/>
        <property name="templateEngine">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
                        <!--视图前缀-->
                        <property name="prefix" value="/WEB-INF/templates/"/>
                        <!--视图后缀-->
                        <property name="suffix" value=".html"/>
                        <property name="templateMode" value="HTML5"/>
                        <property name="characterEncoding" value="UTF-8"/>
                    </bean>
                </property>
            </bean>
        </property>
    </bean>
</beans>

WEB-INF/创建templates/index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
</body>
</html>

三、@RequestMapping注解

1、@RequestMapping注解的功能

从注解名称上我们可以看到，@RequestMapping注解的作用就是将请求和处理请求的控制器方法关联起来，建立映射关系。

SpringMVC接收到指定的请求，就会来找到在映射关系中对应的控制器方法来处理这个请求。

2、@RequestMapping注解的位置

@RequestMapping标识一个类:设置映射请求的请求路径的初始信息

经常用在不同模块中实现同一方法

@RequestMapping标识一个方法:设置映射请求请求路径的具体信息

@Controller
GRequestMapping("/test")
public class RequestMappingController {
  //此时请求映射所映射的请求的请求路径为:/test/testRequestMapping  
  @RequestMapping("/testRequestMapping")
  public string testRequestMapping(){
    return "success";
  }
}

在controller下新建RequestMappingController

package com.atguigu.mvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/hello")
public class RequestMappingController {
//    报错
//    @RequestMapping(value="/")
//    public String index(){
//        return "target";
//    }
    @RequestMapping("/testRequestMapping")
    public String success(){
        return "success";
    }
}

templates下新建success.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
success
</body>
</html>

index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{/testRequestMapping}">测试RequestMapping注解的位置</a><br/>
</body>
</html>

修改index.html

<a th:href="@{/hello/testRequestMapping}">测试RequestMapping注解的位置</a><br/>

3、@RequestMapping注解的value属性

@RequestMapping注解的value属性通过请求的请求地址匹配请求映射

@RequestMapping注解的value属性是一个字符串类型的数组，表示该请求映射能够匹配多个请求地址所对应的请求

@RequestMapping注解的value属性必须设置，至少通过请求地址匹配请求映射

<a th:href="@{/testRequestMapping}">测试@RequestMapping的value属性-->/testRequestMapping</a><br>
<a th:href="e{/test}">测试@RequestMapping的value属性-->/test</a><br>

@RequestMapping(
  value = {"/testRequestMapping", "/test"}
public string testRequestmappingO{
  return "success";
}

SpringMVC2

6、测试HelloWorld

a>实现对首页的访问

b>通过超链接跳转到指定页面在主页index.html中设置超链接

7、总结

复习HelloWorld

三、@RequestMapping注解

1、@RequestMapping注解的功能

2、@RequestMapping注解的位置

3、@RequestMapping注解的value属性

热门文章

最新文章

相关课程

相关电子书

SpringMVC2

6、测试HelloWorld

a>实现对首页的访问

b>通过超链接跳转到指定页面 在主页index.html中设置超链接

7、总结

复习HelloWorld

三、@RequestMapping注解

1、@RequestMapping注解的功能

2、@RequestMapping注解的位置

3、@RequestMapping注解的value属性

热门文章

最新文章

相关课程

相关电子书

b>通过超链接跳转到指定页面在主页index.html中设置超链接