spring boot 读取配置信息到方法参数

一、简介 在日常开发使用 SpringBoot 框架时,经常有一些配置信息需要放置到配置文件中,我们需要手动读取这些配置到应用中进行一些逻辑,这里整理了一些常用读取配置的方法,简单介绍一下。 1、SpringBoot 中常用读取配置方法 SpringBoot 中常用的读取配置方法有: 使用 @Value 注解读取配置

一、简介

在日常开发使用 SpringBoot 框架时,经常有一些配置信息需要放置到配置文件中,我们需要手动读取这些配置到应用中进行一些逻辑,这里整理了一些常用读取配置的方法,简单介绍一下。

1、SpringBoot 中常用读取配置方法

SpringBoot 中常用的读取配置方法有:

  • 使用 @Value 注解读取配置
  • 使用 @ConfigurationProperties 注解读取配置
  • 使用 Environment 对象读取配置
  • 使用 PropertiesLoaderUtils 工具读取配置

2、@Value 和 @ConfigurationProperties 的区别

二者区别@ConfigurationProperties@Value
功能批量注入配置文件中的属性一个个指定
松散绑定(松散语法)支持不支持
SpEL不支持支持
JSR303数据校验支持不支持
复杂类型封装支持不支持

下面会详细介绍使用各个方法是如何读取配置信息。

二、使用 @Value 读取配置

1、@Value 读取配置参数

application.properties 配置文件内容:

my.name=mydlq
my.age=18

使用 @Value 读取配置文件

@Component
public class ReadProperties {

    @Value("${my.name}")
    private String name;

    @Value("${my.age}")
    private Integer age;

}

并且还可以设置一个默认值,放置未从配置文件中读取到该参数:

通过 @Value 读取配置文件
@Component
public class ReadProperties {

    @Value("${my.name:默认姓名}")
    private String name;
    
    @Value("${my.age:18}")
    private Integer age;

}

2、@Value 给参数设定值

使用 @Value 注解给参数设定值,达到跟“=”号一样的赋值效果:

@Component
public class ReadProperties {

    @Value("#{'test value'}")
    private String value;

}

3、@Value 读取系统属性

使用 @Value 注解读取系统环境参数:

@Component
public class ReadProperties {

    @Value("#{systemProperties['os.name']}")
    private String systemPropertiesName;

}

4、@Value 读取 Bean 的属性

测试用的实体对象:

@Data
public class User{
    private String name;
    private String age;
}

使用 @Value 注解读取 Bean 中对象的属性:

@Component
public class ReadProperties {

    @Bean
    public User user(){
        User user = new User();
        user.setName("测试");
        user.setAge("18");
        return user;
    }

    @Value("#{user.name}")
    private String value;
    
}

5、@Value 使用 SpEL 表达式

在 @Value 注解中可以使用 SpEL 表达式,如下是使用 SpEL 表达式生成随机数:

@Component
public class ReadProperties {

    @Value("#{ T(java.lang.Math).random() * 100.0 }")
    private double random;
    
}

6、@Value 读取 Resource 资源文件

使用 @Value 可以读取资源文件进行一些操作:

@Component
public class ReadProperties {

    @Value("classpath:application.properties")
    private Resource resourceFile;

    public void test(){
        // 如果文件存在,就输出文件名称
        if(resourceFile.exists()){
            System.out.println(resourceFile.getFilename());
        }
    }
    
}

三、使用 @ConfigurationProperties 读取配置

1、@ConfigurationProperties 读取配置参数到 String 类型

application.properties 配置文件内容:

my.name=mydlq

使用 @ConfigurationProperties 注解读取对应配置:

@Configuration
@ConfigurationProperties(prefix = "my")   //配置 prefix 来过滤对应前缀
public class ConfigurationReadConfig {

    private String name;
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

}

注意:使用 @ConfigurationProperties 注解读取配置,则需要配置文件内容中的参数添加统一的前缀,在 @ConfigurationProperties 注解中配置该前缀的值,然后前缀后的属性名要与加 @ConfigurationProperties 注解的类中成员变量名称保持一致。

2、@ConfigurationProperties 读取 List 类型参数

application.properties 配置文件内容:

my.list[0]=a
my.list[1]=b
my.list[2]=c

使用 @ConfigurationProperties 注解读取对应配置:

@Configuration
@ConfigurationProperties(prefix = "my")
public class ConfigurationReadConfig {

    private List<String> list;
    
    public List<String> getList() {
        return list;
    }
    public void setList(List<String> list) {
        this.list = list;
    }
    
}

3、@ConfigurationProperties 读取 Map 类型参数

application.properties 配置文件内容:

my.map.name=xiao-li
my.map.sex=man
my.map.age=20

使用 @ConfigurationProperties 注解读取对应配置:

@Configuration
@ConfigurationProperties(prefix = "my")
public class ConfigurationReadConfig {

    private Map<String, String> map;
    
    public Map<String, String> getMap() {
        return map;
    }
    public void setMap(Map<String, String> map) {
        this.map = map;
    }
    
}

4、@ConfigurationProperties 读取 Time 类型参数

application.properties 配置文件内容:

my.time=20s

使用 @ConfigurationProperties 注解读取对应配置:

@Configuration
@ConfigurationProperties(prefix = "my")
public class ConfigurationReadConfig {

     /**
     * 设置以秒为单位
     */
    @DurationUnit(ChronoUnit.SECONDS)
    private Duration time;
    
    public Duration getTime() {
        return time;
    }
    public void setTime(Duration time) {
        this.time = time;
    }
    
}

5、@ConfigurationProperties 读取 DataSize 类型参数

application.properties 配置文件内容:

my.fileSize=10MB

使用 @ConfigurationProperties 注解读取对应配置:

@Configuration
@ConfigurationProperties(prefix = "my")
public class ConfigurationReadConfig {

    /**
     * 设置以 MB 为单位
     */
    @DataSizeUnit(DataUnit.MEGABYTES)
    private DataSize fileSize;

    public DataSize getFileSize() {
        return fileSize;
    }
    public void setFileSize(DataSize fileSize) {
        this.fileSize = fileSize;
    }
    
}

6、@ConfigurationProperties 读取 DataSize 类型参数

application.properties 配置文件内容:

my.fileSize=10MB

使用 @ConfigurationProperties 注解读取对应配置:

@Configuration
@ConfigurationProperties(prefix = "my")
public class ConfigurationReadConfig {

    /**
     * 设置以 MB 为单位
     */
    @DataSizeUnit(DataUnit.MEGABYTES)
    private DataSize fileSize;

    public DataSize getFileSize() {
        return fileSize;
    }
    public void setFileSize(DataSize fileSize) {
        this.fileSize = fileSize;
    }
    
}

7、@ConfigurationProperties 读取配置参数并进行 Valid 效验

application.properties 配置文件内容:

my.name=xiao-ming
my.age=20

使用 @ConfigurationProperties 注解读取对应配置:

@Validated  // 引入效验注解
@Configuration
@ConfigurationProperties(prefix = "my")
public class ConfigurationReadConfigAndValid {

    @NotNull(message = "姓名不能为空")
    private String name;
    @Max(value = 20L,message = "年龄不能超过 20 岁")
    private Integer age;
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }

}

8、@ConfigurationProperties 读取配置到新建 Spring Bean 中

application.properties 配置文件内容:

user.name=mydlq
user.age=22

User 实体类

import lombok.Data;

@Data
public class User {
    private String name;
    private Integer age;
}

使用 @ConfigurationProperties 注解读取对应配置到新建的 Bean 对象中

@Configuration
public class ConfigurationReadObject {

    @Bean("user")
    @ConfigurationProperties(prefix = "user")
    public User createUser(){
        return new User();
    }

}

9、从指定配置文件中读取参数

使用 @ConfigurationProperties 注解是默认从 application.properties 或者 application.yaml 中读取配置,有时候我们需要将特定的配置放到单独的配置文件中,这时候需要 @PropertySource 与 ConfigurationProperties 配置使用,使用 @PropertySource 注解指定要读取的文件,使用 @ConfigurationProperties 相关属性。

测试文件:

  • 测试文件名称:test.txt
  • 测试文件编码方式:UTF-8
  • 测试文件目录:resources/test.txt
  • 测试文件内容:
my.name=mydlq

Java 中配置 @ConfigurationProperties 和 @PropertySource 注解读取对应配置:

@Configuration
@ConfigurationProperties(prefix = "my")
@PropertySource(encoding = "UTF-8", ignoreResourceNotFound = true, value = "classpath:test.txt")
public class ConfigurationReadConfig {

    private String name;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

}

四、使用 Environment 对象读取配置

application.properties 配置文件内容:

my.name=mydlq

使用 Environment 读取配置:

@Component
public class EnvironmentReadConfig {

    private String name;

    @Autowired
    private Environment environment;

    public String readConfig(){
        name = environment.getProperty("my.name", "默认值");
    }

}

五、使用 PropertiesLoaderUtils 读取配置

application.properties 配置文件内容:

my.name=mydlq

使用 Environment 读取配置:

public class PropertiesReadConfig {

    private String name;

    public void readConfig() {
        try {
            ClassPathResource resource = new ClassPathResource("application.properties");
            Properties properties = PropertiesLoaderUtils.loadProperties(resource);
            name = properties.getProperty("my.name", "默认值");
        } catch (IOException e) {
            log.error("", e);
        }
    }

}

六、读取配置文件示例项目

1、Maven 引入相关依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.2.RELEASE</version>
    </parent>

    <groupId>com.aspirecn</groupId>
    <artifactId>springboot-read-config-example</artifactId>
    <version>0.0.1</version>
    <name>springboot-read-config-example</name>
    <description>Spring Boot Read Config</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--SpringBoot Web 依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--用于 SpringBoot 生成配置 metadata 文件-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <!--引入 Lombok 插件,方便操作实体对象-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

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

</project>

2、测试的配置文件

application.properties

## 使用多种方法读取 String 参数
my1.name=xiao-ming
my1.sex=man
my1.age=20

## 使用 @ConfigurationProperties 读取 Map 参数
my2.map.name=xiao-li
my2.map.sex=man
my2.map.age=20

## 使用 @Value 读取 Map 参数
my3.map={name:"xiao-ming",sex:"man",age:"20"}

## 使用 @ConfigurationProperties 读取 List 参数
my4.list[0]=xiao-li
my4.list[1]=man
my4.list[2]=20

## 使用 @Value 读取 List 参数
my5.list=xiao-ming,man,20

## 使用 @ConfigurationProperties 读取 Time 参数
my6.time=20s

## 使用 @ConfigurationProperties 读取 DataSize 参数
my7.fileSize=10MB

## 使用 @ConfigurationProperties 读取参数并进行 @Valid 效验
my8.name=xiao-ming
my8.age=20

3、读取配置的多种方法

(1)、读取 String 配置的 Service

ConfigurationReadString

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;

/**
 * 通过 @PropertySource 指定读取的文件中 String 配置,通过 @ConfigurationProperties 过滤前缀
 */
@Data
@Configuration
@PropertySource(encoding = "UTF-8", ignoreResourceNotFound = true, value = "classpath:application.properties")
@ConfigurationProperties(prefix = "my1")
public class ConfigurationReadString {

    private String name;
    private String sex;
    private String age;

    public String readString(){
        return name + "," + sex + "," + age;
    }

}

EnvironmentReadString

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Service;

/**
 * 从环境对象 Environment 中读取 String 配置
 */
@Service
public class EnvironmentReadString {

    @Autowired
    private Environment environment;

    public String readString(){
        String name = environment.getProperty("my1.name", "");
        String sex = environment.getProperty("my1.sex", "");
        String age = environment.getProperty("my1.age", "18");
        return name + "," + sex + "," + age;
    }

}

PropertiesUtilReadString

import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import java.io.IOException;
import java.util.Properties;

/**
 * 通过 properties 工具读取 String 配置
 */
@Slf4j
public class PropertiesUtilReadString {

    private PropertiesUtilReadString(){}

    public static String readString() {
        try {
            ClassPathResource resource = new ClassPathResource("application.properties");
            Properties properties = PropertiesLoaderUtils.loadProperties(resource);
            String name = properties.getProperty("my1.name", "");
            String sex = properties.getProperty("my1.sex", "");
            String age = properties.getProperty("my1.age", "18");
            return name + "," + sex + "," + age;
        } catch (IOException e) {
            log.error("", e);
        }
        return "";
    }

}

ValueReadString

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

/**
 * 通过 @Value 读取 String 配置
 */
@Service
public class ValueReadString {

    @Value("${my1.name}")
    private String name;

    @Value("${my1.sex}")
    private String sex;

    @Value("${my1.age:18}")
    private String age;

    public String readString() {
        return name + "," + sex + "," + age;
    }

}
(2)、读取 List 配置的 Service

ConfigurationReadList

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import java.util.List;

/**
 * 通过 @ConfigurationProperties 方式读取文件中的 List 数据
 */
@Data
@Configuration
@PropertySource(encoding = "UTF-8", ignoreResourceNotFound = true, value = "classpath:application.properties")
@ConfigurationProperties(prefix = "my4")
public class ConfigurationReadList {

    private List<String> list;

    public String readList() {
        StringBuilder builder = new StringBuilder();
        for (String str:list){
            builder.append(str).append(",");
        }
        // 移除最后的“,”号
        builder.delete(builder.length()-1,builder.length());
        return builder.toString();
    }

}

ValueReadList

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import java.util.List;

/**
 * 通过 @Value 方式读取文件中的 List 数据
 */
@Service
public class ValueReadList {

    @Value("#{'${my5.list}'.split(',')}")
    private List<String> list;

    public String readList() {
        StringBuilder builder = new StringBuilder();
        for (String str:list){
            builder.append(str).append(",");
        }
        // 移除最后的“,”号
        builder.delete(builder.length()-1,builder.length());
        return builder.toString();
    }

}
(3)、读取 Map 配置的 Service

ConfigurationReadMap

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import java.util.Map;

/**
 * 通过 @ConfigurationProperties 方式读取文件中的 Map 数据
 */
@Data
@Configuration
@PropertySource(encoding = "UTF-8", ignoreResourceNotFound = true, value = "classpath:application.properties")
@ConfigurationProperties(prefix = "my2")
public class ConfigurationReadMap {

    private Map<String,String> map;

}

ValueReadMap

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import java.util.Map;

/**
 * 通过 @Value 方式读取文件中的 Map 数据
 */
@Service
public class ValueReadMap {

    @Value("#{${my3.map}}")
    private Map<String, String> map;

    public String readMap(){
        return map.get("name") + "," + map.get("sex") + "," + map.get("age");
    }

}
(4)、读取 Time 的 Service
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.convert.DurationUnit;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import java.time.Duration;
import java.time.temporal.ChronoUnit;

/**
 * 通过 @ConfigurationProperties 读取 time 参数
 */
@Data
@Configuration
@PropertySource(encoding = "UTF-8", ignoreResourceNotFound = true, value = "classpath:application.properties")
@ConfigurationProperties(prefix = "my6")
public class ConfigurationReadTime {

    /**
     * 设置以秒为单位
     */
    @DurationUnit(ChronoUnit.SECONDS)
    private Duration time;

    public String readTime() {
        return String.valueOf(time.getSeconds());
    }

}

常见单位如下:

B for bytes KB for kilobytes MB for megabytes GB for gigabytes TB for terabytes

(5)、读取 DataSize 的 Service
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.convert.DataSizeUnit;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.util.unit.DataSize;
import org.springframework.util.unit.DataUnit;

/**
 * 通过 @ConfigurationProperties 读取 time 参数
 */
@Data
@Configuration
@PropertySource(encoding = "UTF-8", ignoreResourceNotFound = true, value = "classpath:application.properties")
@ConfigurationProperties(prefix = "my7")
public class ConfigurationReadDatasize {

    /**
     * 设置以秒为单位
     */
    @DataSizeUnit(DataUnit.MEGABYTES)
    private DataSize fileSize;

    public String readDatasize() {
        return String.valueOf(fileSize.toMegabytes());
    }

}

常用单位如下:

  • ns (纳秒)
  • us (微秒)
  • ms (毫秒)
  • s (秒)
  • m (分)
  • h (时)
  • d (天)
(6)、读取配置并进行 valie 效验的 service
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.validation.annotation.Validated;
import javax.validation.constraints.Max;
import javax.validation.constraints.NotNull;

/**
 * 通过 @ConfigurationProperties 读取配置并进行 valid 效验
 */
@Data
@Validated  // 效验注解
@Configuration
@PropertySource(encoding = "UTF-8", ignoreResourceNotFound = true, value = "classpath:application.properties")
@ConfigurationProperties(prefix = "my8")
public class ConfigurationReadConfigAndValid {

    @NotNull(message = "姓名不能为空")
    private String name;
    @Max(value = 20L,message = "年龄不能超过 20 岁")
    private Integer age;

    public String readString() {
        return name + "," + age;
    }

}
(7)、读取配置到 Spring Bean 对象中
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * 通过 @ConfigurationProperties 读取到 Spring Bean 对象中
 */
@Configuration
public class ConfigurationReadObject {

    /**
     * 测试的实体类对象
     */
    @Data
    public static class User {
       private String name;
       private Integer age;
    }

    /**
     * 读取以 my9 为前缀的参数的值,到新建的对象中
     */
    @Bean("user")
    @ConfigurationProperties(prefix = "my9")
    public User readObjectData(){
        return new User();
    }

}

4、配置测试用的 Controller

(1)、读取 String 的 Controller
import club.mydlq.service.string.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 读取 String Controller
 */
@RestController
@RequestMapping("/string")
public class ReadStringController {

    @Autowired
    private ValueReadString valueReadConfig;

    @Autowired
    private EnvironmentReadString environmentReadConfig;

    @Autowired
    private ConfigurationReadString configurationReadConfig;

    @GetMapping("/value")
    public String valueReadConfig(){
        return valueReadConfig.readString();
    }

    @GetMapping("/env")
    public String envReadConfig(){
        return environmentReadConfig.readString();
    }

    @GetMapping("/util")
    public String utilReadConfig(){
        return PropertiesUtilReadString.readString();
    }

    @GetMapping("/configuration")
    public String configurationReadConfig(){
        return configurationReadConfig.readString();
    }

}
(2)、读取 List 的 Controller
import club.mydlq.service.list.ConfigurationReadList;
import club.mydlq.service.list.ValueReadList;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 读取 List Controller
 */
@RestController
@RequestMapping("/list")
public class ReadListController {

    @Autowired
    private ValueReadList vlueReadList;

    @Autowired
    private ConfigurationReadList configurationReadList;

    @GetMapping("/value")
    public String valueReadList(){
        return vlueReadList.readList();
    }

    @GetMapping("/configuration")
    public String configReadList(){
        return configurationReadList.readList();
    }

}
(3)、读取 Map 的 Controller
import club.mydlq.service.map.ConfigurationReadMap;
import club.mydlq.service.map.ValueReadMap;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 读取 Map Controller
 */
@RestController
@RequestMapping("/map")
public class ReadMapController {

    @Autowired
    private ConfigurationReadMap configurationReadMap;

    @Autowired
    private ValueReadMap valueReadMap;

    @GetMapping("/configuration")
    public String configReadMap(){
        return configurationReadMap.getMap().get("name") + "," + configurationReadMap.getMap().get("sex") + "," + configurationReadMap.getMap().get("age");
    }

    @GetMapping("/value")
    public String valueReadMap(){
        return valueReadMap.readMap();
    }

}
(4)、读取 Time 的 Controller
import club.mydlq.service.time.ConfigurationReadTime;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 读取 time Controller
 */
@RestController
@RequestMapping("/time")
public class ReadTimeController {

    @Autowired
    private ConfigurationReadTime configurationReadTime;

    @GetMapping("/configuration")
    public String configReadList(){
        return configurationReadTime.readTime();
    }

}
(5)、读取 Datasize 的 Controller
import club.mydlq.service.datasize.ConfigurationReadDatasize;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 读取 Datasize Controller
 */
@RestController
@RequestMapping("/data")
public class ReadDatasizeController {

    @Autowired
    private ConfigurationReadDatasize configurationReadDatasize;

    @GetMapping("/configuration")
    public String configReadList(){
        return configurationReadDatasize.readDatasize();
    }

}
(6)、读取 Datasize 的 Controller
import club.mydlq.service.valid.ConfigurationReadConfigAndValid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 读取参数进行 valid 效验的 Controller
 */
@RestController
@RequestMapping("/valid")
public class ReadValidController {

    @Autowired
    private ConfigurationReadConfigAndValid configurationReadConfigAndValid;

    @GetMapping("/configuration")
    public String configReadList(){
        return configurationReadConfigAndValid.readString();
    }

}
(7)、读取参数到 Spring Bean 对象的 Controller
import club.mydlq.service.string.ConfigurationReadObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 读取参数到对象
 */
@RestController
@RequestMapping("/object")
public class ReadObjectController {

    @Autowired
    private ConfigurationReadObject.User user;

    @GetMapping("/value")
    public Object valueReadConfig(){
        return user;
    }

}

5、启动类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

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

}
知秋君
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