1.引入了前缀，解决了前缀问题
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
组件扫描
将组件扫描<context:component-scan base-package="*"/>
将扫描全部改到扫描具体的包下
不断导入jar包，错误又是不同的
其他人链接：https://blog.csdn.net/m0_37927008/article/details/78288509
出现No mapping情况
无非几种情况 1、controller没被扫描注册到 2、RequestMaping 的映射地址写错 3、映射后缀的问题
这是我的Controller
No mapping 就是映射问题，我写的是
@RequestMapping("./login.do")报错，将./去掉编译成功，成功跳到jsp
junit不断取组件值，确认是否被扫描到，Contoller组件是扫描到，可以获取到，然后再确认HandlerMapping是否配置
@Test public void test() { ApplicationContext ac=new ClassPathXmlApplicationContext("./spring-mvc.xml"); LoginController lc=ac.getBean("loginController",LoginController.class); System.out.print(lc); }
spring-mvc.xml
<!-- 配置HandlerMapping 开启注解配置 -->
<!-- 配置mvc标注扫描 -->
<mvc:annotation-driven/>
<!-- 开启组件扫描 -->
<context:component-scan base-package="com.tracy.*"></context:component-scan>
<!-- 配置ViewResolver -->
<bean id="ModelAndView" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
LoginController
@Controller public class LoginController { @RequestMapping("login.do") public String execute1() { return "login"; } }
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>