【后端】springboot项目

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#spring boot #java #后端 #1024程序员节

于 2024-02-20 23:01:06 首次发布

本文介绍了如何使用SpringBoot2.3.7.RELEASE版本创建项目，包括两种构建方式的pom.xml配置，启动类和测试类的编写，以及如何解决引入`@Value`时application.properties中文乱码的问题，推荐使用UTF-8编码的配置文件。

文章目录

1.新建工程
1. 2.3.7.RELEASE版本搭建
1.4 springboot 引入web关键依赖

【后端目录贴】

1.新建工程

官网默认:https://start.spring.io/
中文社区：https://start.springboot.io
阿里云：http://start.aliyun.com

1. 2.3.7.RELEASE版本搭建

1.1 pom文件

1.1.1 方式一

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
           <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.3.7.RELEASE</version>
                <configuration>
                    <mainClass>com.example.demo33.Demo33Application</mainClass>
                    <!--<skip>true</skip> 要注释，否则打包不可执行-->
                </configuration>
                <executions>
                    <!--执行目标必须加-->
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

1.1.2 方式二

<properties>
    <java.version>1.8</java.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <spring-boot.version>2.3.7.RELEASE</spring-boot.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
    	<groupId>org.projectlombok</groupId>
    	<artifactId>lombok</artifactId>
    	<optional>true</optional>
    </dependency>

      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>${spring-boot.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
                <encoding>UTF-8</encoding>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <version>2.3.7.RELEASE</version>
            <configuration>
                <mainClass>com.example.demo33.Demo33Application</mainClass>
                <!--<skip>true</skip> 要注释，否则打包不可执行-->
            </configuration>
            <executions>
                <execution>
                    <id>repackage</id>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

1.2 启动类

@SpringBootApplication
public class MySpringBootTest {
    public static void main(String[] args) {
        SpringApplication.run(MySpringBootTest.class, args);
    }
}

1.3 测试类

1.3.1 Junit4

import org.junit.jupiter.api.Test; //这个版本不需要public测试方法,其他版本需要测试方法public
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
// 或者@SpringBootTest(classes = MultiDatasource6ApplicationTests .class)
class MultiDatasource6ApplicationTests {

    @Test
    void contextLoads() {
        System.out.println("你好啊");
    }

}

1.3.2 Junit5

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = APIApplication.class)//当测试目录和启动类目录层级不一致时，必须得指定classes类，不然启动会报错。
public class MyTest {

    @Resource
    SyncMessageListener syncMessageListener;

    @Test
    public void test() {
    }

}

1.4 springboot 引入web关键依赖

##spring boot web引入
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

##druid数据源
<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.6</version>
 </dependency>