为什么 Postman 找不到我的 Spring REST API？

Question

我使用 REST API 创建了一个非常基本的 Spring 引导项目。我尝试将它连接到我的 Angular 应用程序，但出现了一些 CORS 安全错误，所以我切换到 Postman。我正在尝试使用 Postman 对其进行测试，但我一直在 Postman 上收到 404 not found 错误。为什么我无法连接到我的后端和 post 测试器功能？

控制器

package controllers;

@RestController
public class Handler {
    
    @PostMapping("/tester/{id}")
    public String tester(@PathVariable(value="id")long userid ){
        
        System.out.println("in tester");
        System.out.println(userid);
        
        return "succeeded test";
    }
}

主要

package halloween.contest;

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class,
        SecurityAutoConfiguration.class})
public class ContestApplication {

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

}

application.properties

spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration

spring.data.rest.base-path=/

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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>2.5.6</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>halloween</groupId>
    <artifactId>contest</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>contest</name>
    <description>halloween picture contest</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

控制台

  .   ____          _            __ _ _
 /\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.5.6)

2021-10-26 15:44:12.823  INFO 18760 --- [           main] halloween.contest.ContestApplication     : Starting ContestApplication using Java 1.8.0_144 on DESKTOP-VB80TS0 with PID 18760 (C:\Users\Sergio Rodríguez\Documents\Halloween\contest\target\classes started by Sergio Rodríguez in C:\Users\Sergio Rodríguez\Documents\Halloween\contest)
2021-10-26 15:44:12.827  INFO 18760 --- [           main] halloween.contest.ContestApplication     : No active profile set, falling back to default profiles: default
2021-10-26 15:44:16.013  INFO 18760 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2021-10-26 15:44:16.043  INFO 18760 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2021-10-26 15:44:16.043  INFO 18760 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.54]
2021-10-26 15:44:16.310  INFO 18760 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2021-10-26 15:44:16.310  INFO 18760 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 3372 ms
2021-10-26 15:44:19.326  INFO 18760 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2021-10-26 15:44:19.342  INFO 18760 --- [           main] halloween.contest.ContestApplication     : Started ContestApplication in 7.201 seconds (JVM running for 7.946)
2021-10-26 15:45:45.138  INFO 18760 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-10-26 15:45:45.139  INFO 18760 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2021-10-26 15:45:45.157  INFO 18760 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 17 ms

等效的 cURL 命令

curl --location --request POST 'localhost:8080/tester/69'

邮递员

Answer 1

要解决 CORS 问题，请在 @PostMapping("/tester/{id}") 旁边添加 @CrossOrigin(origins = "http://localhost:<port>")，其中端口是您的 Angular 应用所在的端口运行。

在您的目标 URL 中，确保您已经包含默认的 Spring 引导端口 8080，例如http://localhost:8080/tester/123 显然，请仔细检查您做的是 POST 而不是 GET。

Answer 2

既然我想通了，就回答我自己的问题。根据我提供的代码，这并不明显，但我会留下我的 post 以供将来帮助（措辞有帮助）。

问题是包的可见性。我的控制器 class 与主 class.

在不同的包中

为什么 Postman 找不到我的 Spring REST API？

Why can't Postman find my Spring REST API?

java

rest

spring-mvc

spring-boot

postman