使用Spring Boot快速启动Spring应用

Spring Boot 项目提供了快速启动一个Spring项目，假设一个使用Hibernate2的CRUD的web应用项目，Maven配置如下：

<?xml version="1.0" encoding="UTF-8"?>
 <project ...

<parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>0.5.0.BUILD-SNAPSHOT</version>
 </parent>

<dependencies>
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-data-jpa</artifactId>
 </dependency>
 <dependency>
 <groupId>org.thymeleaf</groupId>
 <artifactId>thymeleaf-spring3</artifactId>
 </dependency>
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-jetty</artifactId>
 </dependency>
<dependency>
 <groupId>org.hsqldb</groupId>
 <artifactId>hsqldb</artifactId>
 <scope>runtime</scope>
 </dependency>
<dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <scope>test</scope>
 </dependency>
 <dependency>
 <groupId>org.hamcrest</groupId>
 <artifactId>hamcrest-library</artifactId>
 <scope>test</scope>
 </dependency>
</dependencies>

<build>
 <plugins>
 <plugin>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-maven-plugin</artifactId>
 </plugin>
</plugins>
 </build>

</project>

而如果你使用传统方式配置Maven项目，将是下面可怕的配置：

.....

<dependencies>
 <dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>4.11</version>
 <scope>test</scope>
 </dependency>
 <dependency>
 <groupId>org.hamcrest</groupId>
 <artifactId>hamcrest-core</artifactId>
 <version>1.2.1</version>
 </dependency>
 <dependency>
 <groupId>org.hamcrest</groupId>
 <artifactId>hamcrest-library</artifactId>
 <version>1.2.1</version>
 </dependency>

<dependency>
 <groupId>log4j</groupId>
 <artifactId>log4j</artifactId>
 <version>1.2.16</version>
 </dependency>
 <dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>slf4j-api</artifactId>
 <version>${slf4j.version}</version>
 </dependency>
 <dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>jcl-over-slf4j</artifactId>
 <version>${slf4j.version}</version>
 </dependency>
 <dependency>
 <groupId>org.slf4j</groupId>
 <artifactId>slf4j-log4j12</artifactId>
 <version>${slf4j.version}</version>
 </dependency>
 <dependency>
 <groupId>org.aspectj</groupId>
 <artifactId>aspectjrt</artifactId>
 <version>${aspectj.version}</version>
 </dependency>
 <dependency>
 <groupId>org.aspectj</groupId>
 <artifactId>aspectjweaver</artifactId>
 <version>${aspectj.version}</version>
 </dependency>
 <!-- dependency>
 <groupId>Javax.servlet</groupId>
 <artifactId>servlet-api</artifactId>
 <version>2.5</version>
 <scope>provided</scope>
 </dependency -->
 <dependency>
 <groupId>javax.servlet</groupId>
 <artifactId>javax.servlet-api</artifactId>
 <version>3.0.1</version>
 <scope>provided</scope>
 </dependency>
<dependency>
 <groupId>net.sf.flexjson</groupId>
 <artifactId>flexjson</artifactId>
 <version>2.0</version>
 </dependency>
 <!-- Spring dependencies -->
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-core</artifactId>
 <version>${spring.version}</version>
 <exclusions>
 <exclusion>
 <groupId>commons-logging</groupId>
 <artifactId>commons-logging</artifactId>
 </exclusion>
 </exclusions>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-test</artifactId>
 <version>${spring.version}</version>
 <scope>test</scope>
 <exclusions>
 <exclusion>
 <groupId>commons-logging</groupId>
 <artifactId>commons-logging</artifactId>
 </exclusion>
 </exclusions>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-context</artifactId>
 <version>${spring.version}</version>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-aop</artifactId>
 <version>${spring.version}</version>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-aspects</artifactId>
 <version>${spring.version}</version>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-tx</artifactId>
 <version>${spring.version}</version>
 </dependency>
 <dependency>
 <groupId>com.h2database</groupId>
 <artifactId>h2</artifactId>
 <version>${h2.version}</version>
 </dependency>
 <dependency>
 <groupId>org.hibernate</groupId>
 <artifactId>hibernate-core</artifactId>
 <version>${hibernate.version}</version>
 </dependency>
 <dependency>
 <groupId>org.hibernate</groupId>
 <artifactId>hibernate-entitymanager</artifactId>
 <version>${hibernate.version}</version>
 <exclusions>
 <exclusion>
 <groupId>cglib</groupId>
 <artifactId>cglib</artifactId>
 </exclusion>
 <exclusion>
 <groupId>dom4j</groupId>
 <artifactId>dom4j</artifactId>
 </exclusion>
 </exclusions>
 </dependency>
 <dependency>
 <groupId>org.hibernate.javax.persistence</groupId>
 <artifactId>hibernate-jpa-2.0-api</artifactId>
 <version>1.0.0.Final</version>
 </dependency>
 <dependency>
 <groupId>org.hibernate</groupId>
 <artifactId>hibernate-validator</artifactId>
 <version>4.3.0.Final</version>
 <exclusions>
 <exclusion>
 <groupId>javax.xml.bind</groupId>
 <artifactId>jaxb-api</artifactId>
 </exclusion>
 <exclusion>
 <groupId>com.sun.xml.bind</groupId>
 <artifactId>jaxb-impl</artifactId>
 </exclusion>
 </exclusions>
 </dependency>
 <dependency>
 <groupId>javax.validation</groupId>
 <artifactId>validation-api</artifactId>
 <version>1.0.0.GA</version>
 </dependency>