SpringBoot读取properties或者application.yml配置文件中的数据

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读取application文件

在application.yml或者properties文件中添加：

 user.address=china user.company=demo user.name=让我康康

1、使用@Value注解读取

直接代码如下：

 package im.homeapi.controller; import org.springframework.beans.factory.annotation.Value; import org.omg.CORBA.PUBLIC_MEMBER; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; @RestController @RequestMapping(value="/api") public class HomeController { @Value("${user.address}") private String address; @Value("${user.company}") private String company; @Value("${user.name}") private String name; //value 指定访问地址，method 指定请求类型 @RequestMapping(value = "/home",method = RequestMethod.GET) public String Home() { return "Hello Word"; } @RequestMapping(value = "/getConfig") public String getConfig() { return "获取的配置信息 :" + " name=" + name + " address=" + address + " , company=" + company; } }

放到单独的配置类中读取：

 package im.homeapi.entity; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; @Component public class UserConfig { @Value("${user.address}") private String address; @Value("${user.company}") private String company; public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public String getCompany() { return company; } public void setCompany(String company) { this.company = company; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Value("${user.name}") private String name; }

调用如下：

 @Autowired private UserConfig userConfig; //读取配置类 @RequestMapping(value = "/getConfigEntity") public String getConfigEntity() { return "获取的配置信息 :" + " name=" + userConfig.getName() + " address=" + userConfig.getAddress() + " , company=" + userConfig.getCompany(); }

运行结果如下：

2、使用@ConfigurationProperties注解读取方式

代码如下：

 package im.homeapi.entity; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.stereotype.Component; @Component @C<div style="color:transparent">来源gaodai^.ma#com搞#代!码网</div>onfigurationProperties(prefix = "user") public class UserConfig1 { private String address; private String company; private String name; public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public String getCompany() { return company; } public void setCompany(String company) { this.company = company; } public String getName() { return name; } public void setName(String name) { this.name = name; } }

调用：

 package im.homeapi.controller; import im.homeapi.entity.UserConfig; import im.homeapi.entity.UserConfig1; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; import org.omg.CORBA.PUBLIC_MEMBER; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; @RestController @RequestMapping(value="/api") public class ConfigController { @Autowired private UserConfig1 userConfig; //读取配置类 ConfigurationProperties注解读取方式 @RequestMapping(value = "/getConfigEntity1") public String getConfigEntity() { return "获取的配置信息 :" + " name=" + userConfig.getName() + " address=" + userConfig.getAddress() + " , company=" + userConfig.getCompany(); } }

运行结果：

3、读取指定文件

3.1、@PropertySource+@Value注解读取方式

在resources下新建配置config/db-config.properties

注意：@PropertySource不支持yml文件读取。

 db.username=root db.password=123456

如图：

代码：

 package im.homeapi.entity; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.PropertySource; import org.springframework.stereotype.Component; @Component @PropertySource(value = { "config/db-config.properties" }) public class DBConfig { @Value("${db.username}") private String username; @Value("${db.password}") private String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }

调用代码：

 package im.homeapi.controller; import im.homeapi.entity.DBConfig; import im.homeapi.entity.UserConfig; import im.homeapi.entity.UserConfig1; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Value; import org.omg.CORBA.PUBLIC_MEMBER; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; @RestController @RequestMapping(value="/api") public class DbController { @Autowired private DBConfig dbConfig; //读取配置类 PropertySource+@Value注解读取方式 @RequestMapping(value = "/getConfigdb") public String getConfigdb() { return "获取的配置信息 :" + " name=" + dbConfig.getUsername() + " , password=" + dbConfig.getPassword(); } }

运行结果：

3.2、@PropertySource+@ConfigurationProperties注解读取方式

代码：

 package im.homeapi.entity; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.PropertySource; import org.springframework.stereotype.Component; @Component @ConfigurationProperties(prefix = "db") @PropertySource(value = { "config/db-config.properties" }) public class DBconfig1 { private String username; private String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }

调用代码：

 @Autowired private DBconfig1 dbConfig1; //读取配置类 @PropertySource+@ConfigurationProperties注解读取方式 @RequestMapping(value = "/getConfigdb1") public String getConfigdb1() { return "获取的配置信息 :" + " name=" + dbConfig1.getUsername() + " , password=" + dbConfig1.getPassword(); }

运行结果：

@Component 表示将该类标识为Bean

@ConfigurationProperties(prefix = “db”)用于绑定属性，其中prefix表示所绑定的属性的前缀。

@PropertySource(value = “config/db-config.properties”)表示配置文件路径。

4、使用Environment读取

代码：

 @Autowired private Environment environment; //读取配置类 CEnvironment读取方式 @RequestMapping(value = "/getConfigenv") public String getConfigenv() { return "获取的配置信息 :" + " name=" + environment.getProperty("user.name") + " address=" + environment.getProperty("user.address") + " , company=" + environment.getProperty("user.company"); }

运行结果：

总结

从以上示例来看，Spring Boot可以通过@PropertySource,@Value,@Environment,@ConfigurationProperties来绑定变量。

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