第一个Spring程序（Hello Spring）

1.新建一个空的Maven项目

2.导包

spring-webmvc.jar

<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.3.12</version>
</dependency>

3.编写一个实体类

User实体类

package com.feng.pojo;

public class User {
    
    

    private String name;

    public String getName() {
    
    
        return name;
    }

    public void setName(String name) {
    
    
        this.name = name;
    }

    public void show(){
    
    
        System.out.println("Hello,"+name);
    }
}

4.在resources目录下新建一个beans.xml

编写beans.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"
      xsi:schemaLocation="http://www.springframework.org/schema/beans
       https://www.springframework.org/schema/beans/spring-beans.xsd">

   <bean id="hello" class="com.feng.pojo.User">
       <property name="name" value="Spring"/>
   </bean>

</beans>

5. 测试

import com.feng.pojo.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.GenericGroovyApplicationContext;

public class MyTest {
    
    
    public static void main(String[] args) {
    
    
        ApplicationContext context = new GenericGroovyApplicationContext("beans.xml");
        User hello = (User) context.getBean("hello");
        hello.show();
    }
}

6.遇到的问题

若运行时，报Caused by: java.lang.ClassNotFoundException: groovy.lang.GroovyObject错误，则需要导入

<dependency>
    <groupId>org.codehaus.groovy</groupId>
    <artifactId>groovy</artifactId>
    <version>3.0.7</version>
</dependency>