Spring Cloud：API 网关路由不起作用

Question

我正在使用 Spring Cloud。我的 Spring Boot 应用程序中有四个服务

college-service

、

student-service

、

eureka-server

和

api-gateway

。我正在尝试使用 API Gateway 调用

college-service

和

student-service

。当我从 API Gateway 调用 My

college-service

时，它工作正常，但

student-service

不起作用。当我尝试获取

student-serivice

时，出现错误

404

未找到。我是 Spring Cloud 的新人。这是我的代码。

下面是我的网址，在最后一个网址中我得到 404

网址	状态
http://localhost:9001/college/CLG01	200 可以
http://localhost:9002/学院/学生/CLG01	200 可以
http://localhost:9003/college/CLG01	200 可以
http://localhost:9003/学院/学生/CLG01	400 未找到

大学服务

实体

public class College {
    private String clgId;
    private String clgName;
    private String clgCity;

    List<Student> students;

    public College(String clgId, String clgName, String clgCity, List<Student> students) {
        this.clgId = clgId;
        this.clgName = clgName;
        this.clgCity = clgCity;
        this.students = students;
    }

    public College(String clgId, String clgName, String clgCity) {
        this.clgId = clgId;
        this.clgName = clgName;
        this.clgCity = clgCity;
    }
   
    // getter and setter
}

public class Student {
    private Long stId;
    private String stName;
    private String stEmail;
    private String clgId;

    public Student(Long stId, String stName, String stEmail, String clgId) {
        super();
        this.stId = stId;
        this.stName = stName;
        this.stEmail = stEmail;
        this.clgId = clgId;
    }

    // getter and setter
}

学院控制器

@RestController
@RequestMapping("/college")
public class CollegeController {
    @Autowired
    private CollegeService collegeService;

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping(value = "/{clgId}", method = RequestMethod.GET)
    public ResponseEntity<College> getColleges(@PathVariable("clgId") String clgId) {
        College college = collegeService.getCollege(clgId);
        List student = restTemplate.getForObject("http://student-service/college/student/" + college.getClgId(),
                List.class);
        college.setStudents(student);
        return ResponseEntity.ok(college);
    }
}

application.yml

server:
  port: 9001
  
spring:
  application:
    name: college-service
    
eureka:
  instance:
    hostname: localhost

学生服务

学生控制器 实体

public class Student {
    private Long stId;
    private String stName;
    private String stEmail;
    private String clgId;

    public Student(Long stId, String stName, String stEmail, String clgId) {
        super();
        this.stId = stId;
        this.stName = stName;
        this.stEmail = stEmail;
        this.clgId = clgId;
    }

    // getter and setter
}

@RestController
@RequestMapping("/college")
public class StudentCotroller {

    @Autowired
    private StudentService studentService;

    @RequestMapping(value = "/student/{clgId}", method = RequestMethod.GET)
    public ResponseEntity<List<Student>> getStudents(@PathVariable("clgId") String clgId) {
        return ResponseEntity.ok(studentService.getStudents(clgId));
    }

}

application.yml

server:
  port: 9002
  
spring:
  application:
    name: student-service
    
eureka:
  instance:
    hostname: localhost

尤里卡服务器

application.yml

server:
  port: 8761

eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
  server:
    waitTimeInMsWhenSyncEmpty: 0

API网关服务

application.yml

server:
  port: 9003
  
eureka:
  instance:
    hostname: localhost

spring:
  application:
    name: api-gateway
  cloud:
    gateway:
      routes:
      - id: college-service
        uri: lb://college-service
        predicates:
        - Path=/college/**
      - id: student-service
        uri: lb://student-service
        predicates:
        - Path=/student/**

Answer 1

student-service

的谓词是匹配所有以student(

Path=/student/**

)开头的请求。但是，您致电

student-service

并提出以大学开头的请求（

/college/student/CLG01

）。由于您将此服务的谓词设置为

college-service

，因此该请求将与

Path=/college/**

匹配。

/college/**

路径与

/college/student/CLG01

路径匹配。

可能的解决方案：

1. 将您的

   StudentController

   请求映射从

   /college

   更改为

   /student

2. 为您的学生服务使用不同的谓词，例如

   Host

3. 设置特定路径谓词并更改路由顺序：

     routes:
      - id: student-service
        uri: lb://student-service
        predicates:
        - Path=/college/student/**
      - id: college-service
        uri: lb://college-service
        predicates:
        - Path=/college/**

Answer 2

我也有同样的问题。经过尝试很多事情后，我发现问题是 API 网关中的依赖问题。

这很糟糕：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway-mvc</artifactId>        
    <version>4.1.0</version>
</dependency>

这是正确的：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>        
    <version>4.1.0</version>
</dependency>

注意最后一个没有“-mvc”。