springboot常见问题

1.spring搜不到@requestmapping

导入包文件

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

 2.这里是因为application和controller没有在一个包下,改下就好了

 3.报错

Springboot启动时报错 If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.

 在applicationt添加一句

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)

4.拦截器不起作用,在Application上面添加一句

@SpringBootApplication(scanBasePackages={"com.example.demo"})
@ComponentScan(basePackages={"com.example.demo.config"})

 5.找不到template的html的文件

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency> 

右键项目 -》 找到Maven -》 选择Reimport即可，然后重启