我正在演示集成了 Redis 的 Spring boot 应用程序。
我引用了各种网站引用,但最后我更喜欢遵循这个:http://www.baeldung.com/spring-data-redis-tutorial
我的代码与上面链接中给出的代码几乎相同。唯一的变化是我在我的 RestController 类中 Autowiring 了 StudentRepository。
现在,当我当时尝试执行 maven-install 时,出现错误
java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'studentController': Unsatisfied dependency expressed through field 'studentRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentRepositoryImpl' defined in file [/home/klevu/work/Nimesh/Spring Boot Workspace/bootDemo/target/classes/com/example/demo/redis/repository/StudentRepositoryImpl.class]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.example.demo.redis.repository.StudentRepositoryImpl]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: No visible constructors in class com.example.demo.redis.repository.StudentRepositoryImpl
当我试图将构造函数公开时,它成功地创建了构建。但我不知道我是否应该在这里做。我在想,我应该能够进行 setter 注入(inject),而不是 Autowiring 构造函数。我也在下面尝试过:
@Autowired
private RedisTemplate<String, Student> redisTemplate;
但它也不起作用。
package com.example.demo.redis.repository;
import java.util.Map;
import javax.annotation.PostConstruct;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.HashOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Repository;
import com.example.demo.redis.bean.Student;
@Repository
public class StudentRepositoryImpl implements StudentRepository {
private static final String KEY = "Student";
//@Autowired
private RedisTemplate<String, Student> redisTemplate;
private HashOperations<String, String, Student> hashOps;
@Autowired
private StudentRepositoryImpl(RedisTemplate redisTemplate) {
this.redisTemplate = redisTemplate;
}
@PostConstruct
private void init() {
hashOps = redisTemplate.opsForHash();
}
@Override
public void saveStudent(Student person) {
hashOps.put(KEY, person.getId(), person);
}
@Override
public void updateStudent(Student person) {
hashOps.put(KEY, person.getId(), person);
}
@Override
public Student findStudent(String id) {
return hashOps.get(KEY, id);
}
@Override
public Map<String, Student> findAllStudents() {
return hashOps.entries(KEY);
}
@Override
public void deleteStudent(String id) {
hashOps.delete(KEY, id);
}
}
RedisConfiguration是默认的,代码如下:
package com.example.demo.configuration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
@Configuration
public class RedisConfiguration {
@Bean
JedisConnectionFactory jedisConnectionFactory() {
return new JedisConnectionFactory();
}
@Bean
public RedisTemplate<String, Object> redisTemplate(){
RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
template.setConnectionFactory(jedisConnectionFactory());
return template;
}
}
Spring Boot 主入口点声明如下:
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
import org.springframework.data.redis.repository.configuration.EnableRedisRepositories;
@SpringBootApplication
@EnableMongoRepositories(basePackages = {"com.example.demo.mongo.repository"} )
@EnableRedisRepositories(basePackages = {"com.example.demo.redis.repository"})
public class BootDemoApplication {
public static void main(String[] args) {
SpringApplication.run(BootDemoApplication.class, args);
}
}
测试redis的Demo controller如下:
package com.example.demo.controller;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.example.demo.redis.bean.Student;
import com.example.demo.redis.repository.StudentRepository;
@RestController
@RequestMapping("/student")
public class StudentController {
@Autowired
private StudentRepository studentRepository;
@GetMapping
public ResponseEntity<Map<String, Student>> index() {
Map<String, Student> students = studentRepository.findAllStudents();
return new ResponseEntity<Map<String, Student>>(students, HttpStatus.OK);
}
@RequestMapping(method = RequestMethod.GET, value = "/{id}")
public ResponseEntity<Student> getStudentById(@PathVariable("id") String id) {
Student student = studentRepository.findStudent(id);
return new ResponseEntity<Student>(student, HttpStatus.OK);
}
@RequestMapping(method = RequestMethod.POST)
public ResponseEntity<Student> saveStudent(@RequestBody Student student) {
studentRepository.saveStudent(student);
return new ResponseEntity<Student>(student, HttpStatus.CREATED);
}
@RequestMapping(method = RequestMethod.PUT, value = "/{id}")
public ResponseEntity<Student> updateStudent(@RequestBody Student student) {
studentRepository.updateStudent(student);
return new ResponseEntity<Student>(student, HttpStatus.OK);
}
@RequestMapping(method = RequestMethod.DELETE, value = "/{id}")
public ResponseEntity<Student> deleteMessage(@PathVariable("id") String id) {
studentRepository.deleteStudent(id);
return new ResponseEntity<Student>(HttpStatus.OK);
}
}
最佳答案
您将构造函数设置为私有(private)...将其更改为公共(public)
@Autowired
public StudentRepositoryImpl(RedisTemplate redisTemplate) {
this.redisTemplate = redisTemplate;
}
关于spring-boot - Spring 启动+Redis,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45705726/