Java 具有多个控制器的 Spring Boot API？
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Spring Boot API with Multiple Controllers?
提问by user1529412
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:
我开始学习 Spring Boot。我正在努力寻找具有多个 RestController 的示例，这向我表明我可能做错了什么。我正在尝试一个非常简单的示例：目标是进行如下调用：
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.
我只能让 localhost:8080/ 显示。其他调用返回响应：此应用程序没有明确的 /error 映射，因此您将其视为后备。
com.demo.departments
Department.java
DepartmentController.java
com.demo.employees
Employee.java
EmployeeController.java
com.demo
BootDemoApplication.java
Code:
代码：
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("[email protected]");
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>";
}
采纳答案by user1529412
Apparently Controllers in different packages can't be seen with @springbootApplication notation in the main class. The solution explained here, https://kamwo.me/java-spring-boot-mvc-ontroller-not-called/.
显然，在主类中使用 @springbootApplication 符号无法看到不同包中的控制器。此处解释了解决方案，https://kamwo.me/java-spring-boot-mvc-ontroller-not- called/。
回答by Apollo
Try below:-
试试下面：-
@ComponentScan
@Configuration
@EnableAutoConfiguration
public class BootDemoApplication {
public static void main(String[] args) {
SpringApplication.run(BootDemoApplication.class);
}
}
@RestController
@RequestMapping(value = "test", produces = MediaType.APPLICATION_JSON_VALUE)
public class TestController {
@RequestMapping(method = RequestMethod.GET)
public String test() {
return "from test method";
}
}
回答by Ian Riley
For Spring-boot 1.3.x and up, passing a base package to SpringBootApplication should work:
对于 Spring-boot 1.3.x 及更高版本，将基本包传递给 SpringBootApplication 应该可以工作：
@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:
这对我使用 spring-boot 1.4.0 的类似应用程序有效。对于较早版本的 spring-boot，您似乎已经放弃使用 SpringBootApplication 而是使用以下内容来获得与上述相同的效果：
@Configuration
@EnableAutoConfiguration
@ComponentScan(basePackages = {"com.demo"})
public class DemoBootApplication {
// code
}
I found this in the comments on this blog post.
我在这篇博文的评论中发现了这一点。
回答by Patricio Nicola
Try this
尝试这个
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Main {
public static void main(String[] args) {
Object[] sources = new Object[2];
sources[0] = Controller1.class;
sources[1] = Controller2.class;
SpringApplication.run(sources, args);
}
}
回答by Red Boy
ComponentScan annotation works in most cases.
ComponentScan 注释在大多数情况下都有效。
See below example, you could apply similar.
package com.demo;
见下面的例子，你可以应用类似的。
包com.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@ComponentScan(basePackages = {"com.demo"})
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
回答by VietDD
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.
我正在尝试 Spring Boot 并遇到了同样的问题，只是修复了它，我在这里发布了我的解决方案，因为我认为它可能对某人有帮助。
First, put application class ( which contain main method) at the root of controllers's package:
首先，将应用程序类（包含 main 方法）放在控制器包的根目录下：
com.example.demo | +-> controller | | | +--> IndexController.java | +--> LoginController.java | +-> Application.java
com.example.demo | +-> controller | | | +--> IndexController.java | +--> LoginController.java | +-> Application.java
Application.java
应用程序.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 demopackage
Spring会扫描demo包子包的所有组件
IndexController.java (return index.htmlview)
IndexController.java（返回index.html视图）
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.htmlview)
LoginController.java（返回login.html视图）
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
现在我可以进入索引视图：http://localhost:8080/demo/和登录视图：http://localhost:8080/demo/login
回答by Janac Meena
Make sure that the @SpringBootApplication class is in a package which is a level above all other packages that contain @RestControllers, or in the same package.
确保@SpringBootApplication 类位于一个包中，该包高于包含@RestControllers 的所有其他包，或位于同一包中。
回答by jovanchohan
I'm not sure if this is the right way to do it, but when I changed my 2nd Controllers annotation from @Controller to @RestController it started working.
我不确定这是否是正确的方法，但是当我将第二个控制器注释从 @Controller 更改为 @RestController 时，它开始工作。
