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QiShunwang

“诚信为本、客户至上”

SpringBoot_4

2021/4/26 16:30:28   来源:

1.@PropertySource

            @PropertySource:加载指定的配置文件【properties】.
            先前我们通过@ConfifigurationProperties加载全局配置文件[appliaction.properties]中的值到javabean中,但
    是我们在具体使用的时候不会把所用的配置都保存在全局配置文件中的,可能会将不同的配置保存在不同的配置文
    件中,那么这时我们就需要@PropertySource注解为指定的javabean类加载指定的配置文件

例如:
1.用@PropertySource注解导入资源文件,使用 @Value注解注入值

studentbean.properties

student.stuid=1001
student.stuname="zhangsan"
student.stusex=false
student.stuheight=168.5
package com.wangxing.springboot.bean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
@Component
@PropertySource(value = "classpath:studentbean.properties")
public class StudentBean {
    @Value("${student.stuid}")
    private  int  stuid;
    @Value("${student.stuname}")
    private  String  stuname;
    @Value("${student.stusex}")
    private  boolean  stusex;
    @Value("${student.stuheight}")
    private  double  stuheight;

    public int getStuid() {
        return stuid;
    }
    public void setStuid(int stuid) {
        this.stuid = stuid;
    }
    public String getStuname() {
        return stuname;
    }
    public void setStuname(String stuname) {
        this.stuname = stuname;
    }
    public boolean isStusex() {
        return stusex;
    }
    public void setStusex(boolean stusex) {
        this.stusex = stusex;
    }
    public double getStuheight() {
        return stuheight;
    }
    public void setStuheight(double stuheight) {
        this.stuheight = stuheight;
    }
}
package com.wangxing.springboot.controller;
import com.wangxing.springboot.bean.StudentBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/student")
public class StudentController {
    @Autowired
    private StudentBean studentBean;
    @RequestMapping("/testPropertySource.do")
    public  void  testPropertySource(){
        int stuid=studentBean.getStuid();
        String stuname=studentBean.getStuname();
        boolean stusex=studentBean.isStusex();
        double stuheight=studentBean.getStuheight();
        System.out.println(stuid+","+stuname+","+stusex+","+stuheight);
    }
}

2.使用@ConfigurationProperties(prefix = "person")指定前缀,在资源文件中用这个前缀去点属性就可以导入数据

personbean.properties

person.perid=1002
person.pername="lisisi"
person.persex=true
person.perheight=179.8
package com.wangxing.springboot.bean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "person")
@PropertySource(value = "classpath:personbean.properties")
public class PersonBean {
    private  int  perid;
    private  String  pername;
    private  boolean  persex;
    private  double  perheight;

    public int getPerid() {
        return perid;
    }
    public void setPerid(int perid) {
        this.perid = perid;
    }
    public String getPername() {
        return pername;
    }
    public void setPername(String pername) {
        this.pername = pername;
    }
    public boolean isPersex() {
        return persex;
    }
    public void setPersex(boolean persex) {
        this.persex = persex;
    }
    public double getPerheight() {
        return perheight;
    }
    public void setPerheight(double perheight) {
        this.perheight = perheight;
    }
}
package com.wangxing.springboot.controller;
import com.wangxing.springboot.bean.PersonBean;
import com.wangxing.springboot.bean.StudentBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/person")
public class PersonController {
    @Autowired
    private PersonBean personBean;
    @RequestMapping("/testPropertySource.do")
    public  void  testPropertySource(){
        int perid=personBean.getPerid();
        String pername=personBean.getPername();
        boolean persex=personBean.isPersex();
        double perheight=personBean.getPerheight();
        System.out.println(perid+","+pername+","+persex+","+perheight);
    }
}

@PropertySource、@Value和@ConfigurationProperties的用途

名称

用途

@PropertySource(value = "classpath:studentbean.properties")

标注在类上,指定的配置文件【properties】,可以引入多个配置文件,例如

@PropertySource({ "classpath:studentbean.properties",

"classpath:person.properties"})

@Value("${xxxx}")

标注在成员变量上,设置当前成员变量的初始值,可以直接设值@Value("zhangsan"),也可以从@PropertySource指定的配置文件【properties】中取值设置给成员变量@Value("${xxxx}")

@ConfigurationProperties(prefix = "person")

标注在类上,表示设置当前类在配置文件【properties】的配置名称【prefix = "person"】

2.@ImportResource

            @ImportResource:导入基于XML的Spring的配置文件,让配置文件里面的内容生效;
            @ImportResource标注在一个主类上

package com.wangxing.springboot.bean;
public class UserBean {
    private  int  userid;
    private  String  username;
    private  boolean  usersex;
    private  double  userheight;
    public int getUserid() {
        return userid;
    }
    public void setUserid(int userid) {
        this.userid = userid;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public boolean isUsersex() {
        return usersex;
    }
    public void setUsersex(boolean usersex) {
        this.usersex = usersex;
    }
    public double getUserheight() {
        return userheight;
    }
    public void setUserheight(double userheight) {
        this.userheight = userheight;
    }
}
userbean.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="userBean" class="com.wangxing.springboot.bean.UserBean">
        <property name="userid" value="1003"></property>
        <property name="username" value="wangwu"></property>
        <property name="usersex" value="true"></property>
        <property name="userheight" value="168.9"></property>
    </bean>
</beans>
package com.wangxing.springboot.controller;
import com.wangxing.springboot.bean.UserBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserBean userBean;

    @RequestMapping("/testPropertySource.do")
    public  void  testPropertySource(){
        int userid=userBean.getUserid();
        String username=userBean.getUsername();
        boolean usersex=userBean.isUsersex();
        double userheight=userBean.getUserheight();
        System.out.println(userid+","+username+","+usersex+","+userheight);
    }
}

package com.wangxing.springboot.springbootdemo6;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ImportResource;
@SpringBootApplication
@ComponentScan(basePackages = "com.wangxing.springboot")
@ImportResource(value = "classpath:userbean.xml")
public class Springbootdemo6Application {
    public static void main(String[] args) {
        SpringApplication.run(Springbootdemo6Application.class, args);
    }
}

            Spring Boot里面没有Spring的配置文件,我们自己编写的配置文件,也不能自动识别;
            想让Spring的配置文件生效,加载进来.

3.@Configuration   @Bean  @Import

例如:
1.创建一个UserBean类

package com.wangxing.springboot.bean;
public class UserBean {
    private int userid;
    private String username;
    private double userdouble;
    private boolean usersex;
    public int getUserid() {
        return userid;
    }
    public void setUserid(int userid) {
        this.userid = userid;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public double getUserdouble() {
        return userdouble;
    }
    public void setUserdouble(double userdouble) {
        this.userdouble = userdouble;
    }
    public boolean isUsersex() {
        return usersex;
    }
    public void setUsersex(boolean usersex) {
        this.usersex = usersex;
    }
}

2.创建一个UserConfig 类,注入变量需要的数据值并初始化UserBean类


package com.wangxing.springboot.config;
import com.wangxing.springboot.bean.UserBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;=
@Configuration
public class UserConfig {
    @Bean
    public UserBean getBean(){
       UserBean userBean= new UserBean();
       userBean.setUserid(1001);
       userBean.setUsername("zhangsan");
       userBean.setUserdouble(168.9);
       userBean.setUsersex(true);
       return  userBean;
    }
}

3.创建一个UserController 类

package com.wangxing.springboot.controller;
import com.wangxing.springboot.bean.UserBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserBean userBean;
    @RequestMapping("/testUserBean.do")
    public void  testUserBean(){
        int userid= userBean.getUserid();
        String username= userBean.getUsername();
        double userdouble= userBean.getUserdouble();
        boolean usersex= userBean.isUsersex();
        System.out.println(userid+","+username+","+userdouble+","+usersex);
    }
}

4.主类上面使用@Import(UserConfig.class)注解

package com.wangxing.springboot.springbootdemo7;
import com.wangxing.springboot.config.UserConfig;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScans;
import org.springframework.context.annotation.Import;
@SpringBootApplication
@ComponentScan(basePackages = "com.wangxing.springboot")
@Import(UserConfig.class)
public class Springbootdemo7Application {
    public static void main(String[] args) {
        SpringApplication.run(Springbootdemo7Application.class, args);
    }
}

@Configuration、@Bean和@Import(xxxConfig.class)的用途

名称

用途

@Configuration

标注在类上,表示当前类是一个java Config形式的配置类,可以代替基于xml的配置文件

@Bean

标注在方法上,告诉springIOC容器创建javabean类对象

相当于在基于xml配置文件中的

<bean id=”” class=””></bean>

@Import(xxxConfig.class)

标注在主类上,表示导入xxxConfig.class【java Config形式的配置类】

4.Profiles

            1.Profifile文件就是用来配置在不同环境下的配置数据。
            2.因为在不同的环境下配置文件中配置的运行环境的数据是不同的,所以我们就需要灵活的在不同的运行环境下
    切换成对应的运行环境的数据,此时我们将不同的运行环境数据,配置到不同的配置文件中,通过在主配置文件
    application.properties中的spring.profiles.active属性完成切换。

测试.properties配置

application-dev.properties【开发环境配置】
server.port=8080
application-prod.properties【生产环境配置】
server.port=9090
application.properties 【主配置】
spring.profiles.active=prod 【指定使用生产环境配置】
http://localhost:9090/testInfo
或者
spring.profiles.active=dev 【指定使用开发环境配置】

http://localhost:8080/testInfo

测试.yml配置

application-devyml.yml【开发环境配置】
server: 
port: 8080
application-prodyml.yml【生产环境配置】
server: 
port: 9090
application.yml 【主配置】
spring: 
profiles: 
active: prodyml 【指定使用生产环境配置】
http://localhost:9090/testInfo
或者
spring: 
profiles: 
active: devyml 【指定使用开发环境配置】

http://localhost:8080/testInfo

            上面是通过在1.主配置文件中切换运行环境配置
            还可以通过配置2.运行环境参数配置视图窗口来指定具体使用哪一个运行环境

    “--spring.profiles.active=dev“

            还可以通过3.命令行运行jar的时候指定具体使用哪一个运行环境

   java -jar testspringboot002-0.0.1-SNAPSHOT.jar  --spring.profiles.active=dev;

            还可以通过4.配置虚拟机参数指定具体使用哪一个运行环境;

“-Dspring.profiles.active=dev” 

            注意:运行环境配置文件的名称 application-{profiles}.properties/yml

    主配置文件加载位置
            spring boot 启动会扫描以下位置的application.properties或者 application.yml文件作为Spring boot的默认配置文件
            – 项目根目录/config/
            – 项目根目录/
            – resource/config/
            – resource:/  

            以上是按照优先级从高到低的顺序,所有位置的文件都会被加载,高优先级配置内容会覆盖低优先级配置内容。
            SpringBoot会从这四个位置全部加载主配置文件;互补配置
            我们也可以通过配置spring.config.location来改变默认配置
            项目打包好以后,我们可以使用命令行参数的形式,启动项目的时候来指定配置文件的新位置;指定配置文件和默
    认加载的这些配置文件共同起作用形成互补配置;

java -jar testspringboot02-0.0.1-SNAPSHOT.jar --spring.confifig.location=F:/application.properties

    外部配置加载顺序
            Spring Boot 支持多种外部配置方式
            1. 命令行参数
            2. 来自java:comp/env的JNDI属性
            3. Java系统属性(System.getProperties())
            4. 操作系统环境变量
            5. RandomValuePropertySource配置的random.*属性值
            6. jar包外部的application-{profile}.properties或application.yml(带spring.profile)配置文件
            7. jar包内部的application-{profile}.properties或application.yml(带spring.profile)配置文件
            8. jar包外部的application.properties或application.yml(不带spring.profile)配置文件
            9. jar包内部的application.properties或application.yml(不带spring.profile)配置文件
                优先加载带profifile,再来加载不带profifile,由jar包外向jar包内进行寻找
           10. @Configuration注解类上的@PropertySource
           11. 通过SpringApplication.setDefaultProperties指定的默认属性