3章项目属性配置-白红宇

3章项目属性配置

阅读量：4599 次

发布时间：2019-06-09

本文共 5354 字，大约阅读时间需要 17 分钟。

数据库的配置

删掉static和templates这两个目录

application.properties

server.port=8081server.context-path=/girl

application.yml

server:  port: 8082  context-path: /girl

package com.imooc.girl;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;/** * Created by zhongzh * 2018-05-20 08:33 */@RestControllerpublic class HelloController {    @Value("${cupSize}")    private String cupSize;//通过一个注解把配置文件里面的内容给它注到cupSize这个属性变量里面来了    @RequestMapping(value = "/hello",method = RequestMethod.GET)    public String say(){        //return "Hello Spring Boot!";        return cupSize;    }}

server:  port: 8080cupSize: B

server:  port: 8080cupSize: Bage: 18

package com.imooc.girl;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;/** * Created by zhongzh * 2018-05-20 08:33 */@RestControllerpublic class HelloController {    @Value("${cupSize}")    private String cupSize;//通过一个注解把配置文件里面的内容给它注到cupSize这个属性变量里面来了    @Value("${age}")    private Integer age;    @RequestMapping(value = "/hello",method = RequestMethod.GET)    public String say(){        //return "Hello Spring Boot!";        return cupSize + age;    }}

package com.imooc.girl;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;/** * Created by zhongzh * 2018-05-20 08:33 */@RestControllerpublic class HelloController {    @Value("${cupSize}")    private String cupSize;//通过一个注解把配置文件里面的内容给它注到cupSize这个属性变量里面来了    @Value("${age}")    private Integer age;    @Value("${content}")    private String content;    @RequestMapping(value = "/hello",method = RequestMethod.GET)    public String say(){        //return "Hello Spring Boot!";        //return cupSize + age;        return content;    }}

server:  port: 8080cupSize: Bage: 18content: "cupSize: ${cupSize}, age: ${age}"

这样就不用每一次都写一个@Value的注解了。@ConfigurationProperties这个全新的注解它就可以把对应的girl这个前缀下面这些属性给它映射过来 。 application.yml

server:  port: 8080girl:  cupSize: B  age: 18

GirlProperties.java

package com.imooc.girl;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.stereotype.Component;/** * Created by zhongzh * 2018-05-21 16:36 */@Component//你要注入配置还需要加另外一个注解@ConfigurationProperties(prefix = "girl")//获取前缀是girl的配置public class GirlProperties {    private String cupSize;    private Integer age;    public String getCupSize() {        return cupSize;    }    public void setCupSize(String cupSize) {        this.cupSize = cupSize;    }    public void setAge(Integer age) {        this.age = age;    }    public Integer getAge() {        return age;    }}

HelloController.java

package com.imooc.girl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;/** * Created by zhongzh * 2018-05-20 08:33 */@RestControllerpublic class HelloController {    @Autowired    private GirlProperties girlProperties;    /*    @Value("${cupSize}")    private String cupSize;//通过一个注解把配置文件里面的内容给它注到cupSize这个属性变量里面来了    @Value("${age}")    private Integer age;    @Value("${content}")    private String content;*/    @RequestMapping(value = "/hello",method = RequestMethod.GET)    public String say(){        //return "Hello Spring Boot!";        //return cupSize + age;        //return content;        return girlProperties.getCupSize();    }}

这就是如何把配置给写到一个类里面去。这是一种比较推荐的方式，分组。把配置作为一个分组。在家里的时候喜欢B，出门的时候喜欢F。开发环境用的是B，生产环境用的是F。

解决开发环境和生产环境不同的配置的问题。作为一名优秀的工程师，不应该把时间花在频繁的改配置上。

application.yml

spring:  profiles:    active: dev

application-dev.xml

server:  port: 8080girl:  cupSize: B  age: 18

application-prod.xml

server:  port: 8081girl:  cupSize: F  age: 18

application.xml

spring:  profiles:    active: prod

之前讲过一种java -jar的启动方式。首先编译一下。

https://docs.spring.io/spring-boot/docs/2.0.2.RELEASE/reference/html/configuration-metadata.html#configuration-metadata-annotation-processor


             
                  
       
        org.springframework.boot
                   
       
        spring-boot-starter-web
               
              
                  
       
        org.springframework.boot
                   
       
        spring-boot-starter-test
                   
       
        test
               
              
                  
       
        org.springframework.boot
                   
       
        spring-boot-configuration-processor
                   
       
        true