Spring Boot API with Multiple Controllers?

2020-06-03 00:22发布

站内问答 / Java
1936 8 6

I am starting to learn Spring Boot. I am struggling to find an example with multiple RestControllers, which indicates to me that I may be doing something wrong. I am trying a very simple example: The goal is to make calls like the following:

localhost:8080/
localhost:8080/employees/bob
localhost:8080/departments

I can only get localhost:8080/ to display. The other calls return response: This application has no explicit mapping for /error, so you are seeing this as a fallback. 

com.demo.departments
Department.java
DepartmentController.java

com.demo.employees
Employee.java
EmployeeController.java

com.demo
BootDemoApplication.java

Code:

package com.demo.departments
@RestController
@RequestMapping("/departments")
public class DepartmentController {


@RequestMapping("")
public String get(){
    return "test..";

}

@RequestMapping("/list")
public List<Department> getDepartments(){
    return null;

}

}
--------------------------------------------------------------------
package com.demo.employees
@RestController
@RequestMapping("/employees")
public class EmployeeController {

Employee e =new Employee();

@RequestMapping(value = "/{name}", method = RequestMethod.GET, produces = "application/json")
public Employee getEmployeeInJSON(@PathVariable String name) {

 e.setName(name);
 e.setEmail("employee1@genuitec.com");

 return e;

}
}
-----------------------------------------------------------------------

package com.demo
@RestController
@SpringBootApplication

public class BootDemoApplication {

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

@RequestMapping("/")
String home(){
    return "<html> This is the home page for Boot Demo.</html>";
}

8条回答
smile是对你的礼貌
2楼-- · 2020-06-03 01:12

I'm trying Spring Boot and got same problem, and just fixed it, I post my solution here because I think it maybe helpful for someone.

First, put application class ( which contain main method) at the root of controllers's package:

com.example.demo
              |
              +-> controller
              |      |
              |      +--> IndexController.java
              |      +--> LoginController.java
              |
              +-> Application.java

Application.java

package com.example.demo;

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

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

Spring will scan all the components of sub-packages of demo package

IndexController.java (return index.html view)

package com.example.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping(value = {""})
public class IndexController {

    @GetMapping(value = {""})
    public ModelAndView index() {
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("index");
        return modelAndView;
    }

}

LoginController.java (return login.html view)

package com.example.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping(value = {"/login"})
public class LoginController {
    @GetMapping(value = {""})
    public ModelAndView login() {
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("login");
        return modelAndView;
    }
}

And now I can enter Index view : http://localhost:8080/demo/ and Login view : http://localhost:8080/demo/login

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太酷不给撩
3楼-- · 2020-06-03 01:13

For Spring-boot 1.3.x and up, passing a base package to SpringBootApplication should work:

@SpringBootApplication(scanBasePackages = {"com.demo"})
public class DemoBootApplication {
    // code
}

This worked for me on a similar application using spring-boot 1.4.0. For earlier versions of spring-boot, it appears you'll have forego using SpringBootApplication and instead use the following to get same effect as above:

@Configuration
@EnableAutoConfiguration
@ComponentScan(basePackages = {"com.demo"})
public class DemoBootApplication {
    // code
}

I found this in the comments on this blog post.

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