SpringBoot Helloworld 测试 Maven项目

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  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.3.0.RELEASE)

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SpringBoot

化繁为简，简化配置

SpringBoot官方：http://projects.spring.io/spring-boot/
SpringBoot使用介绍：http://blog.youkuaiyun.com/isea533/article/details/50278205

Maven项目使用SpringBoot

建议使用 IDEA ,虽然下面是 Eclipse 测试的例子

配置SpringBoot

pom.xml

<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.springboot</groupId>
    <artifactId>SpringBootTest</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>SpringBootTest Maven Webapp</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
        <tomcat.version>7.0.55</tomcat.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.0.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

</project>

运行程序

运行main方法

SampleController.java

package com.hello;

import java.util.Date;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableAutoConfiguration (exclude={DataSourceAutoConfiguration.class})
public class SampleController {

    @RequestMapping("/")
    String home() {
        return "Hello World!";
    }

    @RequestMapping("/now")
    String hehe() {
        return "现在时间：" + (new Date()).toLocaleString();
    }

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

控制台输出：

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.3.0.RELEASE)

2016-12-15 16:30:13.765  INFO 20952 --- [           main] com.hello.SampleController               : Starting SampleController on DESKTOP-QSFD0OC with PID 20952 (D:\eclipse4.61\eclipse\workspace\SpringBootTest\target\classes started by Peng in D:\eclipse4.61\eclipse\workspace\SpringBootTest)
2016-12-15 16:30:13.768  INFO 20952 --- [           main] com.hello.SampleController               : No profiles are active
2016-12-15 16:30:13.803  INFO 20952 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@149494d8: startup date [Thu Dec 15 16:30:13 CST 2016]; root of context hierarchy
...

在浏览器上输入地址http://localhost:8080/

在浏览器上输入地址http://localhost:8080/now

注意事项

Tomcat问题一

在Java Build Path中，不要加入 Tomcat 运行环境的依赖库，已经在pom.xml中指定了 Tomcat 版本（不指定默认为 Tomcat 8.0.28），从 maven 的依赖包中能找到 Tomcat 的jar包，SpringBoot 自己配有 Tomcat 。

可以参考：http://blog.youkuaiyun.com/zhang168/article/details/51423905

Tomcat问题二

运行 main 方法，出现 Tomcat 不能启动的错误。如下面的异常信息

java.net.BindException: Address already in use: bind
    at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_91]
    at sun.nio.ch.Net.bind(Unknown Source) ~[na:1.8.0_91]
    at sun.nio.ch.Net.bind(Unknown Source) ~[na:1.8.0_91]
org.apache.catalina.LifecycleException: Failed to start component [Connector[org.apache.coyote.http11.Http11NioProtocol-8080]]

Caused by: org.apache.catalina.LifecycleException: service.getName(): "Tomcat";  Protocol handler start failed
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1014) ~[tomcat-embed-core-7.0.55.jar:7.0.55]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ~[tomcat-embed-core-7.0.55.jar:7.0.55]
    ... 13 common frames omitted
Caused by: java.net.BindException: Address already in use: bind

 Unable to start embedded Tomcat servlet container

 Caused by: java.lang.IllegalStateException: Tomcat connector in failed state

原因是你运行了程序一次，javaw.exe 会占用你的端口，可以结束该进程。重新运行 main 方法