在项目的根目录下创建 .vscode/launch.json 文件

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "java",
            "name": "SpringbootDemoApplication",
            "request": "launch",
            "mainClass": "com.bootstudy.springboot_demo.SpringbootDemoApplication",
            "projectName": "springboot-demo",
            "vmArgs": [
                "-Dfile.encoding=UTF-8",
                "-Dspring.profiles.active=dev"
            ],
            "console": "internalConsole",
            "internalConsoleOptions": "openOnSessionStart"
        }
    ]
}

或者另外一种格式

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "java",
            "name": "SpringbootDemoApplication",
            "request": "launch",
            "mainClass": "com.bootstudy.springboot_demo.SpringbootDemoApplication",
            "projectName": "springboot-demo",
            "vmArgs": "-Dfile.encoding=UTF-8 -Dspring.profiles.active=dev",
            "console": "internalConsole",
            "internalConsoleOptions": "openOnSessionStart"
        }
    ]
}

根据项目实际情况，修改name，mainClass，projectName 属性值。