spring boot学习第二篇:spring boot2.6.4版本启动接口服务

1、先启动好

需要改动2个地方

pom.xml里面

1.  
   <parent>
2.  
   <groupId>org.springframework.boot</groupId>
3.  
   <artifactId>spring-boot-starter-parent</artifactId>
4.  
   <version>2.6.4</version>
5.  
   <relativePath/> <!-- lookup parent from repository -->
6.  
   </parent>

 启动后，发现使用http://localhost:8080/demo/api

访问不行

访问http://localhost:8080/api

却是好的。 

无意中看到阿里云开发者平台资料

Spring 全家桶之 Spring Boot 2.6.4（二）- Configuration（Part B）（下）-阿里云开发者社区

注意观察Tomcat started on port(s): 8080 (http) with context path '/demo'这样的启动日志

配置工程上下文根的配置，应该是server.servlet.context-path=/demo这样的，改了后，重启服务

 访问http://localhost:8080/demo/api

 接口正常

2、贴上代码

2.1pom.xml文件内容如下：

1.  
   <?xml version="1.0" encoding="UTF-8"?>
2.  
   <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3.  
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.  
   <modelVersion>4.0.0</modelVersion>
5.  
    
6.  
   <groupId>com.hmblogs</groupId>
7.  
   <artifactId>demo</artifactId>
8.  
   <version>0.0.1-SNAPSHOT</version>
9.  
   <packaging>jar</packaging>
10.  
     
11.  
    <name>demo</name>
12.  
    <description>Demo project for Spring Boot</description>
13.  
     
14.  
    <parent>
15.  
    <groupId>org.springframework.boot</groupId>
16.  
    <artifactId>spring-boot-starter-parent</artifactId>
17.  
    <version>2.6.4</version>
18.  
    <relativePath/> <!-- lookup parent from repository -->
19.  
    </parent>
20.  
     
21.  
    <properties>
22.  
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
23.  
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
24.  
    <java.version>1.8</java.version>
25.  
    </properties>
26.  
     
27.  
    <dependencies>
28.  
    <dependency>
29.  
    <groupId>org.springframework.boot</groupId>
30.  
    <artifactId>spring-boot-starter-web</artifactId>
31.  
    </dependency>
32.  
     
33.  
    <dependency>
34.  
    <groupId>org.springframework.boot</groupId>
35.  
    <artifactId>spring-boot-starter-test</artifactId>
36.  
    <scope>test</scope>
37.  
    </dependency>
38.  
    </dependencies>
39.  
     
40.  
     
41.  
     
42.  
     
43.  
    </project>

2.2application.properties文件内容如下：

1.  
   server.port=8080
2.  
   server.servlet.context-path=/demo

2.3HelloController.java文件内容如下：

1.  
   package com.example.demo;
2.  
    
3.  
   import org.springframework.web.bind.annotation.RestController;
4.  
   import org.springframework.web.bind.annotation.RequestMapping;
5.  
    
6.  
   @RestController
7.  
   public class HelloController {
8.  
    
9.  
   @RequestMapping("/api")
10.  
    public String index() {
11.  
    return "Greetings from Spring Boot!";
12.  
    }
13.  
     
14.  
    }

2.4DemoApplication.java文件内容如下：

1.  
   package com.example.demo;
2.  
    
3.  
   import org.springframework.boot.SpringApplication;
4.  
   import org.springframework.boot.autoconfigure.SpringBootApplication;
5.  
    
6.  
   @SpringBootApplication
7.  
   public class DemoApplication {
8.  
    
9.  
   public static void main(String[] args) {
10.  
    SpringApplication.run(DemoApplication.class, args);
11.  
    }
12.  
     
13.  
    }

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