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讀取application文件

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在application.yml或者properties文件中添加：

info.address=USA info.company=Spring info.degree=high

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@Value注解讀取方式

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import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component;@Component public class InfoConfig1 {@Value("${info.address}")private String address;@Value("${info.company}")private String company;@Value("${info.degree}")private String degree;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 getDegree() {return degree;}public void setDegree(String degree) {this.degree = degree;}}

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@ConfigurationProperties注解讀取方式

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@Component @ConfigurationProperties(prefix = "info") public class InfoConfig2 {private String address;private String company;private String degree;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 getDegree() {return degree;}public void setDegree(String degree) {this.degree = degree;}}

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讀取指定文件

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資源目錄下建立config/db-config.properties:

db.username=root db.password=123456

@PropertySource+@Value注解讀取方式

@Component @PropertySource(value = { "config/db-config.properties" }) public class DBConfig1 {@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;}}

注意：@PropertySource不支持yml文件讀取。

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@PropertySource+@ConfigurationProperties注解讀取方式

@Component @ConfigurationProperties(prefix = "db") @PropertySource(value = { "config/db-config.properties" }) public class DBConfig2 {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;}}

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Environment讀取方式

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以上所有加載出來的配置都可以通過Environment注入獲取到。

@Autowired private Environment env;// 獲取參數 String getProperty(String key);

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總結

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從以上示例來看，Spring Boot可以通過@PropertySource,@Value,@Environment,@ConfigurationProperties來綁定變量。

總結

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