Spring Boot错误：Consider defining a bean of type '*.*.Dao' in your configuration

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Spring Boot错误：Consider defining a bean of type '*.*.Dao' in your configuration

SpringBoot在启动项目的时候遇到了以下情况：

APPLICATION FAILED TO START *************************** Description: Field sysUserDao in com.iamapsycho.service.impl.SysUserServiceImpl required a bean of type 'com.iamapsycho.dao.SysUserDao' that could not be found. Action: Consider defining a bean of type 'com.iamapsycho.dao.SysUserDao' in your configuration.

SpringBoot启动失败，告诉我Bean配置失败，为什么报错呢？

Controller：  

 package com.iamapsycho.controller;          import java.util.List;          import org.springframework.beans.factory.annotation.Autowired;     import org.springframework.stereotype.Controller;     import org.springframework.web.bind.annotation.RequestMapping;     import org.springframework.web.bind.annotation.RequestMethod;     import org.springframework.web.bind.annotation.ResponseBody;          import com.iamapsycho.entity.SysUser;     import com.iamapsycho.service.SysUserService;          import io.swagger.annotations.Api;     import io.swagger.annotations.ApiOperation;          @Controller     @Api(value = "sysUser接口")     @RequestMapping("/sysuser")     public class SysUserController {                  @Autowired         SysUserService sysUserService;                  @ResponseBody         @RequestMapping(value="/getList", method = { RequestMethod.GET, RequestMethod.POST })         @ApiOperation(value="获取用户列表", notes="用户列表")             public List<SysUser> getList(){             List<SysUser> list = sysUserService.getList();             return list;         }     }

Service:

 package com.iamapsycho.service.impl;          import java.util.List;          import org.springframework.beans.factory.annotation.Autowired;     import org.springframework.stereotype.Service;          import com.iamapsycho.dao.SysUserDao;     import com.iamapsycho.entity.SysUser;     import com.iamapsycho.service.SysUserService;          @Service     public class SysUserServiceImpl implements SysUserService {              @Autowired         SysUserDao sysUserDao;                  @Override         public List<SysUser> getList() {             return sysUserDao.getList();         }          }

Dao:

 package com.iamapsycho.dao;          import java.util.List;          import com.iamapsycho.entity.SysUser;          public interface SysUserDao {              List<SysUser> getList();          }

在网上看到网友说要用@Mapper注解，这才把问题解决了 ，至于具体原因，需要通过文档来解释。

解决方案一： Dao层 添加：@Mapper

  package com.iamapsycho.dao;          import java.util.List;          import org.apache.ibatis.annotations.Mapper;          import com.iamapsycho.entity.SysUser;          @Mapper     public interface SysUserDao {              List<SysUser> getList();          }

解决方案二（强烈建议使用）： Application(启动类) 添加：@MapperScan(value = “com.iamapsycho.dao”)

    package com.iamapsycho;     import org.mybatis.spring.annotation.MapperScan;     import org.springframework.boot.SpringApplication;     import org.springframework.boot.autoconfigure.SpringBootApplication;          @SpringBootApplication     @MapperScan(value = "com.iamapsycho.dao")     public class Application {         public static void main(String[] args) {             SpringApplication.run(Application.class, args);         }     }

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作者：iamapsycho  来源：CSDN  原文：blog.csdn/ampsycho/article/details/86243817  版权声明：本文为博主原创文章，转载请附上博文链接！

本文标签： 错误definingbeanbootspring