使用属性文件
1.导入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
2.编辑配置文件
database.driverName=com.mysql.jdbc.Driver
database.url=jdbc.mysql://localhost:3306/chapter3
database.username=root
database.password=123456
3.使用属性配置
package com.springboot.chapter3.pojo;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class DataBaseProperties {
private String driverName = null;
private String url = null;
private String username = null;
private String password = null;
public String getDriverName() {
return driverName;
}
@Value("${database.driverName}")
public void setDriverName(String driverName) {
System.out.println(driverName);
this.driverName = driverName;
}
public String getUrl() {
return url;
}
@Value("${database.url}")
public void setUrl(String url) {
System.out.println(url);
this.url = url;
}
public String getUsername() {
return username;
}
@Value("${database.username}")
public void setUsername(String username) {
System.out.println(username);
this.username = username;
}
public String getPassword() {
return password;
}
@Value("${database.password}")
public void setPassword(String password) {
System.out.println(password);
this.password = password;
}
}
4.使用@ConfigurationProperties注解
@ConfigurationProperties中配置的字符串database,将与POJO的属性名称组成属性的全限定名去配置文件里查找,这样就能将对应的属性读入到POJO当中。
package com.springboot.chapter3.pojo;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
@Component
@ConfigurationProperties("database")
public class DataBaseProperties {
private String driverName = null;
private String url = null;
private String username = null;
private String password = null;
public String getDriverName() {
return driverName;
}
public void setDriverName(String driverName) {
System.out.println(driverName);
this.driverName = driverName;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
System.out.println(url);
this.url = url;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
System.out.println(username);
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
System.out.println(password);
this.password = password;
}
}