springboot2.x——依賴的統一管理

springboot2.x——依賴的統一管理

　　1、創建統一管理依賴庫的項目：dependencies

　　

　　這個項目僅僅對依賴庫的管理，pom.xml文件簡單引入springboot的父工程：

　　

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <!--工程信息-->
    <groupId>com.baiye</groupId>
    <artifactId>spring-boot-dependencies</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <name>spring-boot-dependencies</name>
    <description></description>
    <!--spring-boot 依賴的父工程-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <!--設置第三方依賴庫版本號-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <!--設置第三方依賴庫-->
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

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


</project>

打包方式是pom形式。

2、創建hello項目測試，步驟與dependencies類似。不同的是：pom.xml不需要引入springboot的父工程，而是引入dependencies。

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.baiye</groupId>
    <artifactId>spring-boot-hello</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-hello</name>
    <description></description>

    <!--自定義繼承父工程dependencies-->
    <parent>
        <groupId>com.baiye</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <!--相對路徑：引入父工程的pom.xml-->
        <relativePath>../spring-boot-dependencies/pom.xml</relativePath>
    </parent>
    <!--設置本項目特有的第三方依賴庫-->
    <dependencies>
        
    </dependencies>

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


</project>

至此項目構建完畢，請仔細觀看項目的目錄結構：

接下來簡單寫一個hello例子，測試是否成功自定義的父類依賴，目錄結構如下：

HelloController.java

package com.baiye.springboothello.controller;


import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
    @RequestMapping(value = {"/",""},method = RequestMethod.GET)
    public String hello(){
        return "Hello Spring Boot";
    }
}

啟動main函數，運行如下：

　　與傳統web項目對比：

• 沒有配置 web.xml
• 沒有配置 application.xml，Spring Boot 幫你配置了
• 沒有配置 application-mvc.xml，Spring Boot 幫你配置了
• 沒有配置 Tomcat，Spring Boot 內嵌了 Tomcat 容器