本文的示例代码参考EnableAutoConfiguration
目录
开始
spring init -dweb --build gradle EnableAutoConfiguration
# cd EnableAutoConfiguration
vim src/main/java/com/example/EnableAutoConfiguration/HelloController.java
package com.example.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@RequestMapping("/")
public String hello() {
return "HelloController";
}
}
- 测试
./gradlew bootrun
curl localhost:8080 # 返回"HelloController"
@EnableAutoConfiguration
@SpringBootApplication = @Configuration + @EnableAutoConfiguration + @ComponentScan
vim src/main/java/com/example/EnableAutoConfiguration/DemoApplication.java
package com.example.EnableAutoConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@EnableAutoConfiguration
@ComponentScan
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
- 测试
./gradlew bootrun
curl localhost:8080 # 返回"HelloController"
一个自动配置案例
依赖
./gradlew dependencies | grep jpa && ./gradlew dependencies | grep h2
vim build.gradle
# 省略了未修改代码
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('com.h2database:h2')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
./gradlew dependencies | grep jpa && ./gradlew dependencies | grep h2
模型
vim src/main/java/com/example/EnableAutoConfiguration/Book.java
package com.example.EnableAutoConfiguration;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Book {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
private String title;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
持久化
vim src/main/java/com/example/EnableAutoConfiguration/ReadingListRepository.java
package com.example.EnableAutoConfiguration;
import java.util.List;
import org.springframework.data.jpa.repository.JpaRepository;
public interface ReadingListRepository extends JpaRepository<Book, Long> {
List<Book> findByTitle(String title);
}
控制器
vim src/main/java/com/example/EnableAutoConfiguration/HelloController.java
# 省略了未修改代码
public class ReadingListController {
private ReadingListRepository readingListRepository;
@Autowired
public ReadingListController(ReadingListRepository readingListRepository) {
this.readingListRepository = readingListRepository;
}
@GetMapping("/readinglist")
public List<Book> readingListByTitle(@RequestParam(value="title") String title) {
return readingListRepository.findByTitle(title);
}
@PostMapping("/readinglist")
public Book addToReadingList(@RequestBody Book book) {
System.out.println(book);
return readingListRepository.save(book);
}
}
- 测试
./gradlew bootrun
curl -X POST -H "Content-type: application/json" -d '{"title":"title1"}' http://localhost:8080/readinglist # {"id":1,"title":"title1"}
curl -X POST -H "Content-type: application/json" -d '{"title":"title2"}' http://localhost:8080/readinglist # {"id":2,"title":"title2"}
curl localhost:8080/readinglist?title=title1 # [{"id":1,"title":"title1"}]
curl localhost:8080/readinglist?title=title2 # [{"id":2,"title":"title2"}]
