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SpringBoot-HelloWorld test
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‎.gitignore

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.scala_dependencies
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.worksheet
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将删除 .idea/
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将删除 SpringBoot-HelloWorld/HelloWorld1.iml
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将删除 SpringBoot-HelloWorld/src/main/java/com/
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将删除 SpringBoot-HelloWorld/src/main/resources/
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将删除 SpringBoot-HelloWorld/src/test/
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将删除 SpringBoot-HelloWorld/target/
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将删除 target/

‎README-HelloWorld.md

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# SpringBoot学习--HellWorld
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## 引入pom依赖
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--1. spring-boot-starter-parent可以提供依赖管理,引入以后其它的的starter依赖就可以不用配置版本号.
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```$xslt
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>1.4.0.RELEASE</version>
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</parent>
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```
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但是这里也有一个问题,如果我们已经有一个自己的parent,那么我们就不能在这么引用了.我们可以使用下面的方式:
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```$xslt
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<dependencyManagement>
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<dependencies>
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<dependency>
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<!-- Import dependency management from Spring Boot -->
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-dependencies</artifactId>
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<version>1.4.0.RELEASE</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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```
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--2.spring-boot-starter-web提供了webmvc,tomcat等web开发相关模块
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```$xslt
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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</dependencies>
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```
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##开始HelloWorld
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###一个错误的示例
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我们需要一个main作为入口来启动我们的项目,但这里我们需要注意我们启动的主类不能放在default包下,
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不然会遇到很多莫名的问题,比如下面这个:
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```$xslt
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2017-03-26 20:06:27.320 WARN 8832 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [HelloWorldAppTest1]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'errorPageFilter' for bean class [org.springframework.boot.web.support.ErrorPageFilter] conflicts with existing, non-compatible bean definition of same name and class [org.springframework.boot.context.web.ErrorPageFilter]
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2017-03-26 20:06:27.330 ERROR 8832 --- [ main] o.s.boot.SpringApplication : Application startup failed
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org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [HelloWorldAppTest1]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'errorPageFilter' for bean class [org.springframework.boot.web.support.ErrorPageFilter] conflicts with existing, non-compatible bean definition of same name and class [org.springframework.boot.context.web.ErrorPageFilter]
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```
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###编写我们的第一个HelloWorld
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```$xslt
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@SpringBootApplication
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@RestController
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public class HelloWorldApp2 {
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@RequestMapping("/hello")
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public String hello() {
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return "hello world";
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}
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@RequestMapping("/")
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public String index() {
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return "this is index page";
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}
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/**
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* 用于启动项目
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*
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* @param args
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*/
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public static void main(String[] args) {
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SpringApplication.run(HelloWorldApp2.class, args);
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}
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}
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```
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###启动项目
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我们只需要启动main方法就可以在浏览器访问localhost:8080/hello,当然我们也可以使用maven命令来启动,我们需要添加下面的插件
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```$xslt
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<executions>
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<execution>
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<goals>
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<goal>repackage</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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```
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然后使用mvn spring-boot:run就可以启动项目了,除此之外,我们也可以使用jar包的方式来启动,
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```aidl
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java -jar target/SpringBoot-HelloWorld-2-1.0-SNAPSHOT.jar
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```
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‎README.md

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# SpringBoot-Study
2-
SpringBoot学习
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#SpringBoot

‎SpringBoot-HelloWorld-1/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>SpringBoot-Study</artifactId>
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<groupId>groupId</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<packaging>jar</packaging>
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<artifactId>SpringBoot-HelloWorld-1</artifactId>
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<dependencyManagement>
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<dependencies>
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<dependency>
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<!-- Import dependency management from Spring Boot -->
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-dependencies</artifactId>
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<version>1.4.0.RELEASE</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎SpringBoot-HelloWorld-1/src/main/java/HelloWorldAppTest1.java

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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.web.bind.annotation.RestController;
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/**
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* 这是一个错误的使用方法
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*
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* @author lsj <[email protected]>
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* @date 17-3-26
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*/
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@SpringBootApplication
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@RestController
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public class HelloWorldAppTest1 {
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//
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// @RequestMapping("/hello")
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// public String hello() {
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// return "hello world";
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// }
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//
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// @RequestMapping("/")
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// public String index() {
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// return "this is index page";
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// }
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//
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// /**
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// * 用于启动项目
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// *
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// * @param args
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// */
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// public static void main(String[] args) {
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// SpringApplication.run(HelloWorldAppTest1.class, args);
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// }
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}

‎SpringBoot-HelloWorld-2/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>SpringBoot-Study</artifactId>
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<groupId>groupId</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<groupId>groupId</groupId>
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<artifactId>SpringBoot-HelloWorld-2</artifactId>
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<packaging>jar</packaging>
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<dependencyManagement>
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<dependencies>
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<dependency>
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<!-- Import dependency management from Spring Boot -->
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-dependencies</artifactId>
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<version>1.4.0.RELEASE</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<executions>
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<execution>
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<goals>
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<goal>repackage</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>

‎SpringBoot-HelloWorld-2/src/main/java/com/HelloWorldApp2.java

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package com;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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/**
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* @author lsj <[email protected]>
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* @date 17-3-26
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*/
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@SpringBootApplication
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@RestController
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public class HelloWorldApp2 {
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@RequestMapping("/hello")
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public String hello() {
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return "hello world";
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}
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@RequestMapping("/")
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public String index() {
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return "this is index page";
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}
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/**
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* 用于启动项目
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*
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* @param args
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*/
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public static void main(String[] args) {
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SpringApplication.run(HelloWorldApp2.class, args);
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}
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}

‎SpringBoot-HelloWorld/README.md

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‎SpringBoot-HelloWorld/pom.xml

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‎pom.xml

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<packaging>pom</packaging>
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<version>1.0-SNAPSHOT</version>
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<modules>
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<module>SpringBoot-HelloWorld</module>
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<module>SpringBoot-HelloWorld-1</module>
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<module>SpringBoot-HelloWorld-2</module>
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</modules>
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</project>

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