springboot 配置文件提示

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## springboot 配置文件提示 ##

**官网：**[Configuration Metadata][]

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**配置元数据**

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAb1_nk5znlLDmnY7kuItfbw_size_9_color_FFFFFF_t_70_g_se_x_16][]

The majority of the metadata file is generated automatically at compile time 
    by processing all items annotated with @ConfigurationProperties
    # metadata文件的大部分内容是在编译的时候自动生成的
    
    Spring Boot’s configuration file handling is quite flexible, and it is often the 
    case that properties may exist that are not bound to a @ConfigurationProperties bean. 
    # springboot 配置文件很灵活，有时候配置属性没有和@ConfigurationProperties标注的bean绑定
    
    You may also need to tune some attributes of an existing key. 
    # 有时候也需要对现有的属性进行一些调整
    
    To support such cases and let you provide custom "hints", the annotation processor 
    automatically merges items from META-INF/additional-spring-configuration-metadata.json 
    into the main metadata file
    #　可以使用META-INF/additional-spring-configuration-metadata.json自定义属性，编译的时候会自动合并
    
    The format of the additional-spring-configuration-metadata.json file is exactly the same 
    as the regular spring-configuration-metadata.json. The additional properties file is 
    optional. If you do not have any additional properties, do not add the file
    # additional-spring-configuration-metadata.json、spring-configuration-metadata.json文件格式一致
    # additional-spring-configuration-metadata.json非必需，如果没有额外的属性，则不需要添加该文件

**spring-configuration-metadata.json(部分)**

{
      "groups": [
        {
          "name": "server",
          "type": "org.springframework.boot.autoconfigure.web.ServerProperties",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties"
        },
        {
          "name": "server.compression",
          "type": "org.springframework.boot.web.server.Compression",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties",
          "sourceMethod": "getCompression()"
        },
        {
          "name": "server.error",
          "type": "org.springframework.boot.autoconfigure.web.ErrorProperties",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties",
          "sourceMethod": "getError()"
        },
        {
          "name": "server.error.whitelabel",
          "type": "org.springframework.boot.autoconfigure.web.ErrorProperties$Whitelabel",
          "sourceType": "org.springframework.boot.autoconfigure.web.ErrorProperties",
          "sourceMethod": "getWhitelabel()"
        }
    
        。。。
    
      ],
    
    
      "properties": [
        {
          "name": "server.address",
          "type": "java.net.InetAddress",
          "description": "Network address to which the server should bind.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties"
        },
        {
          "name": "server.compression.enabled",
          "type": "java.lang.Boolean",
          "description": "Whether response compression is enabled.",
          "sourceType": "org.springframework.boot.web.server.Compression",
          "defaultValue": false
        },
        {
          "name": "server.compression.excluded-user-agents",
          "type": "java.lang.String[]",
          "description": "Comma-separated list of user agents for which responses should not be compressed.",
          "sourceType": "org.springframework.boot.web.server.Compression"
        },
        {
          "name": "server.compression.mime-types",
          "type": "java.lang.String[]",
          "description": "Comma-separated list of MIME types that should be compressed.",
          "sourceType": "org.springframework.boot.web.server.Compression",
          "defaultValue": [
            "text\/html",
            "text\/xml",
            "text\/plain",
            "text\/css",
            "text\/javascript",
            "application\/javascript",
            "application\/json",
            "application\/xml"
          ]
        },
        {
          "name": "server.compression.min-response-size",
          "type": "org.springframework.util.unit.DataSize",
          "description": "Minimum \"Content-Length\" value that is required for compression to be performed.",
          "sourceType": "org.springframework.boot.web.server.Compression",
          "defaultValue": "2KB"
        },
        {
          "name": "server.error.include-binding-errors",
          "type": "org.springframework.boot.autoconfigure.web.ErrorProperties$IncludeAttribute",
          "description": "When to include \"errors\" attribute.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ErrorProperties",
          "defaultValue": "never"
        },
        {
          "name": "server.error.include-exception",
          "type": "java.lang.Boolean",
          "description": "Include the \"exception\" attribute.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ErrorProperties",
          "defaultValue": false
        },
        {
          "name": "server.error.include-message",
          "type": "org.springframework.boot.autoconfigure.web.ErrorProperties$IncludeAttribute",
          "description": "When to include \"message\" attribute.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ErrorProperties",
          "defaultValue": "never"
        },
        {
          "name": "server.error.include-stacktrace",
          "type": "org.springframework.boot.autoconfigure.web.ErrorProperties$IncludeAttribute",
          "description": "When to include the \"trace\" attribute.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ErrorProperties",
          "defaultValue": "never"
        },
        {
          "name": "server.error.path",
          "type": "java.lang.String",
          "description": "Path of the error controller.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ErrorProperties",
          "defaultValue": "\/error"
        },
        {
          "name": "server.error.whitelabel.enabled",
          "type": "java.lang.Boolean",
          "description": "Whether to enable the default error page displayed in browsers in case of a server error.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ErrorProperties$Whitelabel",
          "defaultValue": true
        },
        {
          "name": "server.forward-headers-strategy",
          "type": "org.springframework.boot.autoconfigure.web.ServerProperties$ForwardHeadersStrategy",
          "description": "Strategy for handling X-Forwarded-* headers.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties"
        },
        {
          "name": "server.max-http-header-size",
          "type": "org.springframework.util.unit.DataSize",
          "description": "Maximum size of the HTTP message header.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties",
          "defaultValue": "8KB"
        },
        {
          "name": "server.port",
          "type": "java.lang.Integer",
          "description": "Server HTTP port.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties",
          "defaultValue": 8080
        },
        {
          "name": "server.server-header",
          "type": "java.lang.String",
          "description": "Value to use for the Server response header (if empty, no header is sent).",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties"
        }
        {
          "name": "server.shutdown",
          "type": "org.springframework.boot.web.server.Shutdown",
          "description": "Type of shutdown that the server will support.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties",
          "defaultValue": "immediate"
        }
    
        。。。
    
      ],
    
    
      "hints": [
        {
          "name": "server.servlet.jsp.class-name",
          "providers": [
            {
              "name": "class-reference",
              "parameters": {
                "target": "javax.servlet.http.HttpServlet"
              }
            }
          ]
        },
        {
          "name": "server.tomcat.accesslog.encoding",
          "providers": [
            {
              "name": "handle-as",
              "parameters": {
                "target": "java.nio.charset.Charset"
              }
            }
          ]
        },
        {
          "name": "server.tomcat.accesslog.locale",
          "providers": [
            {
              "name": "handle-as",
              "parameters": {
                "target": "java.util.Locale"
              }
            }
          ]
        }
    
        。。。
    
      ]
    }

**\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**groups 标签**

**groups 包含的属性**

name：组名
    type：组名对应的数据类型
    description：组名简短描述
    sourceType：元类型，@ConfigurationProperties标注在类上，sourceType为类的名称
                      @ConfigurationProperties标注在方法上（方法上标注@Bean），sourceType为方法所在的类
    sourceMethod：源方法

**示例**

*************
    ServerProperties
    
    @ConfigurationProperties(prefix = "server",ignoreUnknownFields = true)
                            //ServerProperties上有注解@ConfigurationProperties
    public class ServerProperties {
    
        @NestedConfigurationProperty
        private final ErrorProperties error = new ErrorProperties();
    
        @NestedConfigurationProperty
        private final Compression compression;
    
        public ErrorProperties getError() {
            return this.error;
        }
    
        public Compression getCompression() {
            return this.compression;
        }
    
    
    *************
    ErrorProperties
    
    public class ErrorProperties {
    
        private final ErrorProperties.Whitelabel whitelabel;
    
    
    
    *************
    groups 设置
    
      "groups": [
        {
          "name": "server",
          "type": "org.springframework.boot.autoconfigure.web.ServerProperties",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties"
        },
        {
          "name": "server.compression",
          "type": "org.springframework.boot.web.server.Compression",
                                              //方法返回类型为Compression
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties",
                                              //方法所在的类为ServerProperties
          "sourceMethod": "getCompression()"
        },
        {
          "name": "server.error",
          "type": "org.springframework.boot.autoconfigure.web.ErrorProperties",
                                              //方法返回类型为ErrorProperties
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties",
                                              //方法所在的类为ServerProperties
          "sourceMethod": "getError()"
        },
        {
          "name": "server.error.whitelabel",
          "type": "org.springframework.boot.autoconfigure.web.ErrorProperties$Whitelabel",
                                              //方法返回类型为Whitelabel（ErrorProperties的内部类）
          "sourceType": "org.springframework.boot.autoconfigure.web.ErrorProperties",
                                              //方法所在的类为ServerProperties
          "sourceMethod": "getWhitelabel()"
        }

**\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**properties 标签**

**properties 可包含的属性**

name：property属性名称
    type：属性数据类型，如：java.lang.String、java.util.Map<java.lang.String,com.example.MyEnum>
    description：属性描述
    sourceType：包含该属性的类
    defaultValue：属性默认值
    deprecation：属性是否被禁用
    
    deprecation属性设置：
    level：warning（默认） 应用中仍会使用
           error 应用中不会使用
    reason：属性禁用理由
    replacement：替换的属性

**示例**

@ConfigurationProperties("my.app")
    public class MyProperties {
    
        private String name;
    
        public String getName() {
            return this.name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        @Deprecated
        @DeprecatedConfigurationProperty(replacement = "my.app.name")
        public String getTarget() {
            return this.name;
        }
    
        @Deprecated
        public void setTarget(String target) {
            this.name = target;
        }
    
    }

"properties": [
        {
          "name": "server.address",
          "type": "java.net.InetAddress",
          "description": "Network address to which the server should bind.",
          "sourceType": "org.springframework.boot.autoconfigure.web.ServerProperties"
        },
        {
          "name": "server.compression.enabled",
          "type": "java.lang.Boolean",
          "description": "Whether response compression is enabled.",
          "sourceType": "org.springframework.boot.web.server.Compression",
          "defaultValue": false
        }
    
        。。。
    
      ]

**\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**hints 标签**

**hints 可包含的属性**

name：提示的属性名称
    values：属性值，ValueHint[]
    providers：provider及参数，ValueProvider[]
    
    values 可包含的属性
    value：提示的值
    description：相关描述
    
    providers 可包含的属性
    name：provider名称
    parameters：provider支持的参数，数据类型为JSON object

**示例**

{"hints": [
        {
            "name": "my.contexts.keys",
            "values": [
                {
                    "value": "sample1"
                },
                {
                    "value": "sample2"
                }
            ]
        }
    ]}

**provider name可选值**

# any
    The special any provider value permits any additional values to be provided.
    This provider is typically used if you have a list of values and any extra 
    values should still be considered as valid
    
    {"hints": [
        {
            "name": "system.state",
            "values": [
                {
                    "value": "on"
                },
                {
                    "value": "off"
                }
            ],
            "providers": [
                {
                    "name": "any"
                }
            ]
        }
    ]}
    
    
    # class-reference：The class-reference provider auto-completes classes available in the project
    parameter包含属性
    target：The fully qualified name of the class that should be assignable to the chosen value
    concrete：Specify whether only concrete classes are to be considered as valid candidates
    
    {"hints": [
        {
            "name": "server.servlet.jsp.class-name",
            "providers": [
                {
                    "name": "class-reference",
                    "parameters": {
                        "target": "javax.servlet.http.HttpServlet"
                    }
                }
            ]
        }
    ]}
    
    
    # handle-as：lets you substitute the type of the property to a more high-level type. 
    This typically happens when the property has a java.lang.String type, because you do not 
    want your configuration classes to rely on classes that may not be on the classpath
    parameters 包含唯一属性target，target可选值：
    java.lang.Enum：Lists the possible values for the property
    java.nio.charset.Charset：Supports auto-completion of charset/encoding values
    java.util.Locale： auto-completion of locales (such as en_US)
    org.springframework.util.MimeType：Supports auto-completion of content type values (such as text/plain)
    org.springframework.core.io.Resource: Supports auto-completion of Spring’s Resource abstraction to refer to a file on the filesystem or on the classpath (such as classpath:/sample.properties)
    
    {"hints": [
        {
            "name": "spring.liquibase.change-log",
            "providers": [
                {
                    "name": "handle-as",
                    "parameters": {
                        "target": "org.springframework.core.io.Resource"
                    }
                }
            ]
        }
    ]}
    
    
    #　logger-name：auto-completes valid logger names and logger groups
    parameter 包含的属性
    group：Specify whether known groups should be considered
    
    {"hints": [
        {
            "name": "logging.level.keys",
            "values": [
                {
                    "value": "root",
                    "description": "Root logger used to assign the default logging level."
                },
                {
                    "value": "sql",
                    "description": "SQL logging group including Hibernate SQL logger."
                },
                {
                    "value": "web",
                    "description": "Web logging group including codecs."
                }
            ],
            "providers": [
                {
                    "name": "logger-name"
                }
            ]
        },
        {
            "name": "logging.level.values",
            "values": [
                {
                    "value": "trace"
                },
                {
                    "value": "debug"
                },
                {
                    "value": "info"
                },
                {
                    "value": "warn"
                },
                {
                    "value": "error"
                },
                {
                    "value": "fatal"
                },
                {
                    "value": "off"
                }
    
            ],
            "providers": [
                {
                    "name": "any"
                }
            ]
        }
    ]}
    
    
    # spring-bean-reference：auto-completes the beans that are defined in the configuration of the current project
    parameters包含属性target
    target：The fully qualified name of the bean class that should be assignable to the candidate
    
    {"hints": [
        {
            "name": "spring.jmx.server",
            "providers": [
                {
                    "name": "spring-bean-reference",
                    "parameters": {
                        "target": "javax.management.MBeanServer"
                    }
                }
            ]
        }
    ]}
    
    
    # spring-profile-name：auto-completes the Spring profiles that are defined in the configuration of the current project
    
    {"hints": [
        {
            "name": "spring.profiles.active",
            "providers": [
                {
                    "name": "spring-profile-name"
                }
            ]
        }
    ]}

**           **

## **\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*** ##

**示例**

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**导入 jar 包**

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-configuration-processor</artifactId>
                <optional>true</optional>
            </dependency>

**\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**配置文件**

**application.yml**

person:
      name: 瓜田李下
      age: 20

**\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**pojo 层**

**Person**

@Data
    @Component
    @ConfigurationProperties("person")
    public class Person {
    
        private String name;
        private Integer age;
    }

**\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**controller 层**

**HelloController**

@RestController
    public class HelloController {
    
        @Resource
        private Person person;
    
        @RequestMapping("/hello")
        public Person hello(){
            System.out.println(person);
    
            return person;
        }
    }

## **\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*** ##

**使用测试**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**默认生成的提示文件**

**点击项目运行，编译后会自动生成spring-configuration-metadata.json**

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAb1_nk5znlLDmnY7kuItfbw_size_9_color_FFFFFF_t_70_g_se_x_16 1][]

**编译后，生成的spring-configuration-metadata.json**

{
      "groups": [
        {
          "name": "person",
          "type": "com.example.demo.pojo.Person",
          "sourceType": "com.example.demo.pojo.Person"
        }
      ],
      "properties": [
        {
          "name": "person.age",
          "type": "java.lang.Integer",
          "sourceType": "com.example.demo.pojo.Person"
        },
        {
          "name": "person.name",
          "type": "java.lang.String",
          "sourceType": "com.example.demo.pojo.Person"
        }
      ],
      "hints": []
    }

**\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**自定义配置提示文件**

**resources 目录下新建META-INF/additional-spring-configuration-metadata.json**

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAb1_nk5znlLDmnY7kuItfbw_size_9_color_FFFFFF_t_70_g_se_x_16 2][]

**additional-spring-configuration-metadata.json**

{
      "properties": [
        {
          "name": "person.age",
          "type": "java.lang.Integer",
          "description": "用户年龄.",
          "sourceType": "com.example.demo.pojo.Person"
        },
        {
          "name": "person.name",
          "type": "java.lang.String",
          "description": "用户姓名.",
          "sourceType": "com.example.demo.pojo.Person"
        }
      ]
    }

**编译后，该文件会自动合并到spring-configuration-metadata.json**

**编译后，target/classes/META-INF**目录下生成**spring-configuration-metadata.json**

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAb1_nk5znlLDmnY7kuItfbw_size_9_color_FFFFFF_t_70_g_se_x_16 3][]

**编译后，生成的****spring-configuration-metadata.json**

{
      "groups": [
        {
          "name": "person",
          "type": "com.example.demo.pojo.Person",
          "sourceType": "com.example.demo.pojo.Person"
        }
      ],
      "properties": [
        {
          "name": "person.age",
          "type": "java.lang.Integer",
          "description": "用户年龄.",
          "sourceType": "com.example.demo.pojo.Person"
        },
        {
          "name": "person.name",
          "type": "java.lang.String",
          "description": "用户姓名.",
          "sourceType": "com.example.demo.pojo.Person"
        }
      ],
      "hints": []
    }

**                           **

**                                 **

[Configuration Metadata]: https://docs.spring.io/spring-boot/docs/current/reference/html/configuration-metadata.html#configuration-metadata
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