Using the Java Spring Framework,
Creating web applications
However, I want to register more than one Bean, but it doesn't work.
·Objective
Want to handle more than one Bean
·Error message
Consumer marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed
·What I did to resolve the error
@Grant Qualifier
User.java
package com.example.demo.entity;
import java.io.Serializable;
import org.springframework.stereotype.Component;
@ Component ("User")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
private int userId;
private int pass;
public int getUserId(){
return userId;
}
public void setUserId(int userId){
this.userId = userId;
}
public int getPass(){
return pass;
}
public void setPass(int pass){
This.pass = pass;
}
}
Info.java
package com.example.demo.entity;
import java.io.Serializable;
import org.springframework.beans.factory.announcement.Qualifier;
import org.springframework.stereotype.Component;
@ Component ("Info")
public class Information Serializable {
private static final long serialVersionUID = 1L;
private intexamId;
private String exampleName;
private String exampleDate;
public int getExamId(){
return exampleId;
}
public void setExamId(intexamId){
This.examId =examId;
}
public void setExamName(StringexamName){
This.examName=examName;
}
public void setExamDate(StringexamDate){
This.examDate=examDate;
}
public String getExamName(){
return exampleName;
}
public String getExamDate(){
return exampleDate;
}
}
ServiceUserImpl.java
package com.example.demo.service;
import java.util.List;
import org.springframework.beans.factory.announcement.Autowired;
import org.springframework.beans.factory.announcement.Qualifier;
import org.springframework.stereotype.Service;
import com.example.demo.dao.UserDao;
import com.example.demo.entity.Info;
import com.example.demo.entity.User;
@Service
public classServiceUserImplementationsTestService{
@Autowired
UserDao;
@Autowired
@ Qualifier ("User")
User user;
@ Override
publicList selectWhere(Objectt){
User = (User)t;
List<User>list=dao.selectWhere(u);
return list;
}
}
ServiceExamInfoImpl.java
package com.example.demo.service;
import java.util.List;
import org.springframework.beans.factory.announcement.Autowired;
import org.springframework.beans.factory.announcement.Qualifier;
import org.springframework.stereotype.Service;
import com.example.demo.dao.ExamInfoDao;
import com.example.demo.entity.Info;
@Service
public classServiceExamInfoImplementationsTestService{
@Autowired
ExamInfoDao;
@Autowired
@ Qualifier ("Info")
Info info;
@ Override
publicList selectWhere(Objectt){
Info info=(Info)t;
List<Info>list=dao.selectWhere(info);
return list;
}
It is important to know which bean the error message in the question statement appears for.Just before the error message appears in the question text, you will also see what the problem is.
If the code in the question is possible, you may have tried to auto-wire the TestService, but in this case, for example, @Qualifier should be given as follows:
@RestController
public class MyController {
@Autowired
@ Qualifier ("serviceUserImpl")
private TestService testService;
...
Supplement:
The default qualifier value is bean name, and the default bean name is lowercase at the beginning of the class name.
In other words, if you do not specify anything, the ServiceUserImpl qualifier value is serviceUserImpl.
1.9.4. Fine-tuning Annotation-based Autowiring with Qualifiers
For a fallback match, the bean name is considered a default qualifier value.
1.10.6. Naming Autodetected Components
If such an announcement contains no name value or for any other detected component (such as these discovered by custom filters), the default bean name generator returns the uncapacitated non-qualified class name.
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