springcloud入门（1）

最新推荐文章于 2025-07-11 13:18:47 发布

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最新推荐文章于 2025-07-11 13:18:47 发布

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本文介绍如何使用SpringBoot创建一个简单的应用。从搭建Maven项目开始，配置必要的依赖，并编写启动类，最终实现了一个能返回“Hello World!”消息的小应用。

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今天用springboot创建一个小应用。

首先，创建一个简单的maven应用，如下图：

然后，配置pom.xml文件：

<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 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.test</groupId>
  <artifactId>springcloud_helloworld</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>springcloud_helloworld Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.1.RELEASE</version>
  </parent>
  <dependencies>
    <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
  </dependencies>
  <repositories>         
   <repository>           
    <snapshots>             
     <enabled>false</enabled>            
     </snapshots>            
     <id>central</id>            
     <name>Maven Repository Switchboard</name>            
     <url>http://repo2.maven.org/maven2</url>          
     </repository>        
     </repositories>
  <build>
    <finalName>springcloud_helloworld</finalName>
    
  </build>
  
</project>

接下来编写相应的启动类，代码如下：

package com.springcloud.hello;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@SpringBootApplication
public class Example {

	@RequestMapping("/")
	String home(){
		return "Hello World!";
		
	}
	 public static void main(String[] args) throws Exception {
		 SpringApplication.run(Example.class, args);
	 }
}

启动这个类，成功运行后，在浏览器输入http://localhost:8080/便可看到如下字样：

注意，启动类一定要在一个自己定义的包下，比如com.springcloud.hello，否则会出现如下异常：

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: URL [jar:file:/E:/repository/org/springframework/boot/spring-boot-autoconfigure/1.3.1.RELEASE/spring-boot-autoconfigure-1.3.1.RELEASE.jar!/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration$JdbcTemplateConfiguration.class]; nested exception is java.lang.IllegalStateException: Could not evaluate condition on org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$JdbcTemplateConfiguration due to org/springframework/dao/DataAccessException not found. Make sure your own configuration does not rely on that class. This can also happen if you are @ComponentScanning a springframework package (e.g. if you put a @ComponentScan in the default package by mistake)