春季启动 - 考虑定义类型

Question

的豆试图运行我的春节，启动应用程序时，我收到错误：

场studentMapper在com.adam.rest.client.impl.StudentClientImpl 需要“'com.adam.rest.mapper.StudentMapper'，找不到 。

你能提出什么问题吗？ （参见下面的文件）

App.java

package com.adam.rest; 

import org.springframework.boot.SpringApplication; 
import org.springframework.boot.autoconfigure.SpringBootApplication; 

@SpringBootApplication 
public class App { 

    public static void main(String[] args) { 
     SpringApplication.run(App.class, args); 
    } 
} 

StudentClientImpl.java

package com.adam.rest.client.impl; 

import com.adam.rest.mapper.StudentMapper; 
import com.adam.rest.model.Student; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Repository; 

import java.util.Collection; 
import java.util.HashMap; 
import java.util.Map; 

@Repository 
public class StudentClientImpl { 

    @Autowired 
    private StudentMapper studentMapper; 

    private static Map<Integer, Student> students; 
     // DUMMY DATA GOES HERE 

    Collection<Student> getStudents() { return this.students.values(); } 

    Student getStudent(Integer id) { return this.students.get(id); } 

    ... 

StudentMapper.java

package com.adam.rest.mapper; 

import com.adam.rest.model.Student; 

import java.util.Collection; 

public interface StudentMapper { 

    Collection<Student> getStudents(); 

    Student getStudent(Integer id); 

    Student getStudent(String name); 

    void updateStudent(Student student); 

    void removeStudent(Integer id); 

    void removeStudent(String name); 

    void createStudent(Student student); 

} 

Answer 1

您接口创建一个实现类：

public class StudentMapperImpl implements StudentMapper { 
... 
} 

然后添加一个@Bean方法您@SpringBootApplication类或者其他类@Configuration。

例如：

@SpringBootApplication 
public class App { 

    public static void main(String[] args) { 
     SpringApplication.run(App.class, args); 
    } 

    @Bean 
    public StudentMapperImpl studentMapper() { 
     return new StudentMapperImpl(); 
    } 
}