Maven + Spring mvc： Hello World

我不是女神ヾ 2021-09-19 06:56 313阅读 0赞

在文章：[https://www.jianshu.com/p/dda8e695405e][https_www.jianshu.com_p_dda8e695405e]  
中已经介绍了maven的使用，接下来再了解一下spring mvc的使用。  
学习地址:  
[https://blog.csdn.net/weixin\_38070406/article/details/80866036][https_blog.csdn.net_weixin_38070406_article_details_80866036]  
[https://www.cnblogs.com/withscorpion/p/5621838.html][https_www.cnblogs.com_withscorpion_p_5621838.html]

1.  新建一个maven项目：
    
      
    
    
    ![2789632-a2d7838ee8d7b7bc.png][]
2.  修改maven配置，加入依赖：  
    pom.xml

<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.iotzzh.hellomvc</groupId>
      <artifactId>hellomvc</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>war</packaging>
      
      <dependencies>
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>3.8.1</version>
          <scope>test</scope>
        </dependency>
        
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency>
            
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>${commons-lang.version}</version>
        </dependency>
        
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>slf4j-api</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
            </exclusions> 
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
      </dependencies>
      
      <properties>
          <commons-lang.version>2.6</commons-lang.version>
          <slf4j.version>1.7.21</slf4j.version>
          <spring.version>4.3.0.RELEASE</spring.version>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
      </properties>
      
      <dependencyManagement>
          <dependencies>
              <dependency>
                  <groupId>org.springframework</groupId>
                  <artifactId>spring-framework-bom</artifactId>
                  <version>${spring.version}</version>
                  <type>pom</type>
                  <scope>import</scope>
              </dependency>       
          </dependencies>
          
          
      </dependencyManagement>
      
      <build>
            <plugins>
                <plugin>
                    <groupId>org.apache.tomcat.maven</groupId>
                    <artifactId>tomcat7-maven-plugin</artifactId>
                    <version>2.2</version>
                    <executions>
                        <execution>
                            <phase>package</phase>
                            <goals>
                                <goal>run</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
    
            </plugins>
        </build>
      
      
    </project>

1.  在Java Resources，src/main/java中新建com.iotzzh.controller.HelloWorldController.java

package com.iotzzh.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    @Controller
    @RequestMapping("/hello")
    
    public class HelloWorldController {
    
        @RequestMapping("/helloworld")
        public String helloworld(){
            System.out.println("nihao");
            return "hello world";
        }
    
    }

1.  在src/main/java/webapp/WEB-INF下新建web.xml配置如下：

<?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
                http://www.springmodules.org/schema/cache/springmodules-cache.xsd 
                http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd"
      xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                          http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
      version="4.0"
      metadata-complete="true">
    
      <display-name>hello world</display-name>
      <description>
         Welcome to my world
      </description>
      
      <servlet>
            <servlet-name>spring</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        </servlet>
    
        <servlet-mapping>
            <servlet-name>spring</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    
    </web-app>

以上配置，默认它会找serlet-name-servlet.xml，即我们配置的spring-servlet.xml

1.  我们在WEB-INF下新建spring-servlet.xml，这就是springmvc的配置文件，当然我们也可以修改web.xml中的配置来把它改为通用的spring-mvc.xml  
    这里我们不改，就用spring-servlet.xml，代码如下:

<?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:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
          http://www.springframework.org/schema/beans/spring-beans.xsd 
          http://www.springframework.org/schema/context 
          http://www.springframework.org/schema/context/spring-context.xsd 
          http://www.springframework.org/schema/tx 
          http://www.springframework.org/schema/tx/spring-tx.xsd
          http://www.springframework.org/schema/mvc
          http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    
       
       <context:component-scan base-package="com.iotzzh.controller" />
    
       
       <mvc:annotation-driven />
    
       
       <mvc:default-servlet-handler />
    
       
       <bean
           class="org.springframework.web.servlet.view.InternalResourceViewResolver">
           <property name="prefix" value="/WEB-INF/view/"></property>
           <property name="suffix" value=".jsp"></property>
       </bean>
    
    </beans>

视图解析器中配置了，所以我们在WEB-INF中新建view文件夹，再建hello.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
        pageEncoding="ISO-8859-1"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="ISO-8859-1">
    <title>Insert title here</title>
    </head>
    <body>
        <h1>hello world.</h1>
    </body>
    
    </html>

在网页中输入：[http://localhost:8080/hellomvc/hello/helloworld][http_localhost_8080_hellomvc_hello_helloworld]，页面就会出现hello world。  
或者在postman中输入，它会返回html代码。  
值得注意的是：这里要加上项目名称springtest，否则会出现404.

show time:

![2789632-a7d32b7fd295e185.png][]

![2789632-f6ac2e69412e3563.png][]

[https_www.jianshu.com_p_dda8e695405e]: https://www.jianshu.com/p/dda8e695405e
[https_blog.csdn.net_weixin_38070406_article_details_80866036]: https://blog.csdn.net/weixin_38070406/article/details/80866036
[https_www.cnblogs.com_withscorpion_p_5621838.html]: https://www.cnblogs.com/withscorpion/p/5621838.html
[2789632-a2d7838ee8d7b7bc.png]: /images/20210615/c07725f9d5944a918a225821708a6c0b.png
[http_localhost_8080_hellomvc_hello_helloworld]: http://localhost:8080/hellomvc/hello/helloworld
[2789632-a7d32b7fd295e185.png]: /images/20210615/23abb12faec147c5a8b6f35036195cd7.png
[2789632-f6ac2e69412e3563.png]: /images/20210615/034f81ebb581477ca7e9175a03769ea7.png