写要给简单的测试页，可以进入到主页，主要想串一下MVC。
1.在resources/templates/下新建一个index.html
management
Hello world!
2.在src下新建controller包和service包
image.png
3.在service包下新建一个service接口类以及对应的实现类，并将一个mapper注入到service实现类（不知道ideal创建实现类的时候是否有跟eclipse一样可选的接口，idea创建类的时候貌似没看到有让选择接口的地方）
package com.lee.management.service;
public interface IndexService {
}
package com.lee.management.service.impl;
import com.lee.management.mapper.SysUserMapper;
import com.lee.management.service.IndexService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service
class IndexServiceImpl implements IndexService {
@Resource
private SysUserMapper sysUserMapper;
}
4.给所有mapper接口添加注解(这里学会一个idea关闭单个文件的快捷键Ctrl+f4)
import org.springframework.stereotype.Repository;
@Repository
public interface SysMenuMapper {
5.controller及service代码编写
package com.lee.management.controller;
import com.lee.management.service.IndexService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.annotation.Resource;
@Controller
public class IndexController {
@Resource
private IndexService indexService;
@RequestMapping("/index")
public String indexPage(){
System.out.println(indexService.getSysUser().getName());
return "index";
}
}
package com.lee.management.service;
import com.lee.management.entity.SysUser;
public interface IndexService {
public SysUser getSysUser();
}
package com.lee.management.service.impl;
import com.lee.management.entity.SysUser;
import com.lee.management.mapper.SysUserMapper;
import com.lee.management.service.IndexService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service
class IndexServiceImpl implements IndexService {
@Resource
private SysUserMapper sysUserMapper;
@Override
public SysUser getSysUser() {
return sysUserMapper.selectByPrimaryKey(1L);
}
}
6.启动项目，查看运行结果
启动报错了
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'indexServiceImpl': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sysUserMapper' defined in file [D:\IntelliJIDEAWorkSpace\management\target\classes\com\lee\management\mapper\SysUserMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration': Unexpected exception during bean creation; nested exception is java.lang.TypeNotPresentException: Type org.apache.ibatis.scripting.LanguageDriver not present
百度说jar冲突，通过maven面板的show dependencies查看依赖关系：
然后发现了一个冲突：
然后把pom.xml里的mybatis版本修改如下：
org.mybatis
mybatis
3.5.5
然后再启动就正常了。
2021-11-25 14:49:14.759 INFO 9524 --- [ main] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page template: index
2021-11-25 14:49:14.886 INFO 9524 --- [ main] .s.s.UserDetailsServiceAutoConfiguration :
Using generated security password: 787f64a6-1fad-4b14-b696-5958faabe1bb
2021-11-25 14:49:14.967 INFO 9524 --- [ main] o.s.s.web.DefaultSecurityFilterChain : Will secure any request with [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@1702830d, org.springframework.security.web.context.SecurityContextPersistenceFilter@64469d8, org.springframework.security.web.header.HeaderWriterFilter@12c60152, org.springframework.security.web.csrf.CsrfFilter@19382338, org.springframework.security.web.authentication.logout.LogoutFilter@2e51d054, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@5c7668ba, org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter@474c9131, org.springframework.security.web.authentication.ui.DefaultLogoutPageGeneratingFilter@6a937336, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@7dd611c8, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@4c18621b, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@43e1692f, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@278667fd, org.springframework.security.web.session.SessionManagementFilter@6cd164a6, org.springframework.security.web.access.ExceptionTranslationFilter@282ffbf5, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@6ec7bce0]
2021-11-25 14:49:15.048 INFO 9524 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2021-11-25 14:49:15.063 INFO 9524 --- [ main] c.lee.management.ManagementApplication : Started ManagementApplication in 1.938 seconds (JVM running for 2.626)
访问首页出来登录（我觉得是spring security在起作用，下期研究一下spring security）
image.png
如果把pom.xml中带security的依赖先注释掉，再启动项目就达到预想的目的了。