SpringBoot配置项目属性

1. 项目内置属性

配置文件application.properties可以自定义
之前的版本使用server.context-path
后面的版本使用server.servlet.context-path

src/main/resource/com/andrew/application.properties

server.port=8000
server.servlet.context-path=/HelloWorld
helloWorld=spring boot \u4F60\u975E\u5E38\u597D\uFF01

src/main/java/com/andrew/controller/HelloWorldController.java

package com.andrew.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloWorldController {
    @Value("${helloWorld}")
    private String helloWorld;
    
    @RequestMapping("/hello")
    public String say(){
        return helloWorld;
    }
}

HelloWorldApplication.java右键Run As选择Spring Boot App

http://localhost:8000/HelloWorld/hello
运行结果：
spring boot 你非常好！

2. 自定义属性

src/main/resource/com/andrew/application.properties

server.port=8000
server.servlet.context-path=/HelloWorld
helloWorld=spring boot \u4F60\u975E\u5E38\u597D\uFF01

mysql.jdbcName=com.mysql.jdbc.Driver
mysql.dbUrl=jdbc:mysql://localhost:3306/springboot
mysql.userName=root
mysql.password=root

src/main/java/com/andrew/controller/HelloWorldController.java

package com.andrew.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloWorldController {
    @Value("${helloWorld}")
    private String helloWorld;

    @Value("${mysql.jdbcName}")
    private String jdbcName;
    @Value("${mysql.dbUrl}")
    private String dbUrl;
    @Value("${mysql.userName}")
    private String userName;
    @Value("${mysql.password}")
    private String password;

    @RequestMapping("/hello")
    public String say() {
        return helloWorld;
    }
    @RequestMapping("/showJdbc")
    public String showJdbc() {
        return "mysql.jdbcName:" + jdbcName + "<br/>" 
                + "mysql.dbUrl:" + dbUrl + "<br/>" 
                + "mysql.userName:" + userName + "<br/>" 
                + "mysql.password:" + password;
    }
}

HelloWorldApplication.java右键Run As选择Spring Boot App

http://localhost:8000/HelloWorld/showJdbc
运行结果：
mysql.jdbcName:com.mysql.jdbc.Driver
mysql.dbUrl:jdbc:mysql://localhost:3306/springboot
mysql.userName:root
mysql.password:root

3. Configuration Properties配置

src/main/resource/com/andrew/application.properties

server.port=8000
server.servlet.context-path=/HelloWorld
helloWorld=spring boot \u4F60\u975E\u5E38\u597D\uFF01

mysql.jdbcName=com.mysql.jdbc.Driver
mysql.dbUrl=jdbc:mysql://localhost:3306/springboot
mysql.userName=root
mysql.password=root

src/main/java/com/andrew/properties/MysqlProperties.java

package com.andrew.properties;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix="mysql")
public class MysqlProperties {
    private String jdbcName;
    private String dbUrl;
    private String userName;
    private String password;
    // getter and setter
}

根据@ConfigurationProperties(prefix="mysql")的提示
在pom.xml中Add spring-boot-configuration-processor to pom.xml
也可以自己查询手动添加

pom.xml

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
</dependency>

src/main/java/com/andrew/controller/MysqlController.java

package com.andrew.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.andrew.properties.MysqlProperties;

@RestController
public class MysqlController {
    @Autowired
    private MysqlProperties mysqlProperties;
    @RequestMapping("/showMysqlJdbc")
    public String showMysqlJdbc() {
        return "mysql.jdbcName:" + mysqlProperties.getJdbcName() + "<br/>"
                + "mysql.dbUrl:" + mysqlProperties.getDbUrl() + "<br/>"
                + "mysql.userName:" + mysqlProperties.getUserName() + "<br/>"
                + "mysql.password:" + mysqlProperties.getPassword();
    }
}

http://localhost:8000/HelloWorld/showMysqlJdbc
运行结果：
mysql.jdbcName:com.mysql.jdbc.Driver
mysql.dbUrl:jdbc:mysql://localhost:3306/springboot
mysql.userName:root
mysql.password:root