SpringBoot 连接 MongoDB

Question

我正在学习 Spring boot 将数据插入 MongoDB 并遇到了一些问题。请给我一些建议，谢谢。

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.2</version>
        <relativePath/>
        <!-- lookup parent from repository -->
    </parent>
    <groupId>com.onboard.proj</groupId>
    <artifactId>onboard</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

UserController.java

@RestController
public class UserController {
    @Autowired
    MongoService db;
        
    @PostMapping("/create")
    public User createNew(@RequestParam("name") String name, @RequestParam("role") String role){
        User obj = new User(name, role);
        User newObj = db.save(obj);
        return newObj;
    }
}

MongoService.java

@Service
public class MongoService {
@Autowired
    MongoRepository repo;
            
    public User save(User u) {
        return repo.save(u);
    }
}

MongoRepository.java

public class MongoRepository {
    @Autowired
    private MongoTemplate template;
    
    
    public User save(User e) {
        if(e != null) {
            template.insert(e);
        }
        return e;
    }
}

User.java

@Document
public class User {
    @Id
    private String id;
    
    //@Field("name")
    private String name;
    
    //@Field("role")
    private String role;

    public String getId() {
        return id;
    }
    public String getName() {
        return name;
    }
    public String getRole() {
        return role;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    public void setRole(String role) {
        this.role = role;
    }
    
    public User(String name, String role) {
        super();
        this.name = name;
        this.role = role;
    }
    
    public User() {
        super();
    }
}

我尝试使用 PostMan 并进行了以下设置，但无法访问 UserController。 Postman 的结果始终为 404，未找到。

Answer 1

还要在类级别添加注释 @RequestMapping("/")，因为 Spring 还需要为您的类映射，而不仅仅是方法。

@RestController
@RequestMapping("/")
public class UserController {

你也有

@RequestParam("name") String name, @RequestParam("role") String role

但在 Postman 中，您在 JSON 正文中传递 name 和 role。它没有被编码为这样工作。您应该在 Postman 中将 name 和 role 作为查询参数传递。

Answer 2

@RestController

@RequestMapping("/")
public class UserController {
        @Autowired
        MongoService db;
            
        @PostMapping("/create")
        public User createNew(@RequestParam("name") String name, @RequestParam("role") String role){
            User obj = new User(name, role);
            User newObj = db.save(obj);
            return newObj;
        }
    }

最好使用swagger，您可以轻松获得端点。