Jenkins部署Java项目：你的专属代码“外卖小哥”

# 安装Jenkins（Ubuntu示例）
sudo apt update
sudo apt install openjdk-11-jdk
wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -
sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt update
sudo apt install jenkins
# 启动我们的“外卖小哥”
sudo systemctl start jenkins
sudo systemctl enable jenkins

# 查看初始密码
sudo cat /var/lib/jenkins/secrets/initialAdminPassword

pipeline {
    agent any
    
    tools {
        maven 'M3'  // 告诉小哥要用Maven这个厨具
        jdk 'JDK11' // 指定Java版本，就像指定火候
    }
    
    environment {
        // 定义环境变量，就像准备调味料
        PROJECT_NAME = "my-awesome-app"
        VERSION = "${BUILD_ID}"
    }
    
    stages {
        stage('代码拉取') {
            steps {
                echo '🛵 小哥正在取货中...'
                git branch: 'main', 
                    url: 'https://github.com/yourname/your-java-project.git'
            }
        }
        
        stage('编译打包') {
            steps {
                echo '👨‍🍳 小哥正在烹饪代码大餐...'
                sh 'mvn clean compile package -DskipTests'
            }
        }
        
        stage('单元测试') {
            steps {
                echo '🧪 品尝测试：确保味道正宗'
                sh 'mvn test'
            }
            post {
                always {
                    junit 'target/surefire-reports/*.xml' // 生成测试报告
                }
            }
        }
        
        stage('质量检查') {
            steps {
                echo '🔍 美食评审团检查菜品质量'
                sh 'mvn sonar:sonar -Dsonar.projectKey=my-project'
            }
        }
        
        stage('构建Docker镜像') {
            steps {
                echo '📦 用精美餐具装盘'
                script {
                    docker.build("${PROJECT_NAME}:${VERSION}")
                }
            }
        }
        
        stage('部署到服务器') {
            steps {
                echo '🚀 外卖小哥飞奔送货中...'
                sh """
                    docker stop ${PROJECT_NAME} || true
                    docker rm ${PROJECT_NAME} || true
                    docker run -d --name ${PROJECT_NAME} \
                           -p 8080:8080 \
                           ${PROJECT_NAME}:${VERSION}
                """
            }
        }
        
        stage('健康检查') {
            steps {
                echo '❤️ 确认客户吃得开心'
                sh """
                    sleep 30
                    curl -f http://localhost:8080/health || exit 1
                """
            }
        }
    }
    
    post {
        success {
            echo '🎉 完美！客户给了五星好评！'
            emailext (
                subject: "🚀 构建成功: ${PROJECT_NAME} - ${VERSION}",
                body: "你的Java应用已经成功部署啦！快去享用吧！",
                to: "dev-team@company.com"
            )
        }
        failure {
            echo '😱 糟糕！外卖撒了一地！'
            emailext (
                subject: "💥 构建失败: ${PROJECT_NAME} - ${VERSION}",
                body: "赶紧检查一下，代码厨房出问题了！",
                to: "dev-team@company.com"
            )
        }
    }
}

# 选择基础镜像 - 就像选餐盘
FROM openjdk:11-jre-slim
# 设置工作目录 - 餐桌摆放位置
WORKDIR /app
# 复制打包好的JAR文件 - 上菜！
COPY target/*.jar app.jar
# 暴露端口 - 告诉客人从哪里用餐
EXPOSE 8080
# 启动命令 - 开饭啦！
ENTRYPOINT ["java", "-jar", "app.jar"]

URL: http://你的Jenkins地址:8080/github-webhook/

properties([
    parameters([
        choice(
            choices: ['dev', 'test', 'prod'],
            description: '选择部署环境',
            name: 'DEPLOY_ENV'
        ),
        string(
            defaultValue: '1.0.0',
            description: '输入版本号',
            name: 'APP_VERSION'
        ),
        booleanParam(
            defaultValue: false,
            description: '是否跳过测试',
            name: 'SKIP_TESTS'
        )
    ])
])
// 在部署阶段使用参数
stage('环境特定部署') {
    steps {
        script {
            if (params.DEPLOY_ENV == 'prod') {
                echo '🚨 生产环境部署 - 打起精神！'
                // 生产环境特定配置
            } else {
                echo '😎 测试环境部署 - 轻松一点'
                // 测试环境配置
            }
            
            def testFlag = params.SKIP_TESTS ? '-DskipTests' : ''
            sh "mvn deploy ${testFlag}"
        }
    }
}

# 查看小哥的工作状态
sudo systemctl status jenkins
# 查看工作日志
sudo journalctl -u jenkins -f
# 备份小哥的记忆（配置备份）
sudo tar -czf jenkins-backup.tar.gz /var/lib/jenkins/

// 并行执行示例
stage('并行任务') {
    parallel {
        stage('代码检查') {
            steps { sh 'mvn checkstyle:check' }
        }
        stage('安全扫描') {
            steps { sh 'mvn dependency-check:check' }
        }
    }
}