SpringMVC creation steps

(1) Development environment

create

.Solve the problem of slow maven project creation:

archetypeCatalog
internal

Create direction: java, resources: right click: mark directory as (sources root and Resources root)

(2) Guide coordinates (guide package)

<spring.version>5.0.2.RELEASE</spring.version>

<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>

(3) Front-end controller

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

(5) Configure Tomcat server

(6) Create a basic class, jsp page

(7) Guide constraint

（9）

<!--Enable annotation scanning--> 
<context:component-scan base-package="cn.rzpt"></context:component-scan>

@Controller
public class HellController {

    @RequestMapping(path = "/hello")
    public String sayHello(){
        System.out.println("hello springmvc");
        return null;
    }
}

(10) Tomcat starts springmvc.xml

<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>

@RequestMapping(path = "/hello") 
public String sayHello(){ 
    System.out.println("hello springmvc"); 
    //By default jump to the jsp page with the success file name 
    return "success"; 
}

Create success.jsp

<!--视图解析器对象-->
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/pages/"></property>
    <property name="suffix" value=".jsp"
</bean>

<!--Enable the support of springmvc framework annotations--> 
<mvc:annotation-driven></mvc:annotation-driven>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>入门程序</title>
</head>
<body>
<a href="hello">入门程序</a>
</body>
</html>

Start steps:

(1) Start the server and load some configuration files

According to the <load-on-startup>1</load-on-startup> configuration, the server creates the DispatcherServlet object

During startup,

<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>  被加载

According to springmvc.xml, automatically scan the class, according to

@Controller 
public class HellController is created as an object and added to the spring container by default

<!--视图解析器对象-->
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/pages/"></property>
    <property name="suffix" value=".jsp"></property>
</bean>   可以创建对象

<!--Enable the support of springmvc framework annotations--> 
<mvc:annotation-driven></mvc:annotation-driven> enable

@RequestMapping(path = "/hello") annotation takes effect 
public String sayHello()

(2) Send a request,

```
<a href="hello">Starter program</a>
```
Send to web.xml, url-pattern filtering, Servlet----DispatcherServlet (command center, control function)
According to the project path/hello, send a request to the Servlet written by myself:
```
HellController
```

according to

@RequestMapping(path = "/hello"), execute the sayHello method, and return the success string

<!--View resolver object--> 
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
    <property name="prefix" value="/WEB-INF/pages /"></property> 
    <property name="suffix" value=".jsp"></property> 
</bean> According to the configuration here, go to the success.jsp file

SpringMVC creation steps

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