前言:
在配置文件中自己定义的值,怎么注入到程序中,比如:mq队列的名称,缓存的key,文件的路径等。
代码:
首先建一个springboot工程
pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.xhx.springboot</groupId> <artifactId>springboot2</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot2</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.1.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
自己定义一个配置文件test.properties
my.name=xuhaixing my.age=25 my.sex=man
启动类:
package com.xhx.springboot; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Springboot2Application { public static void main(String[] args) { SpringApplication.run(Springboot2Application.class, args); } }
第一种方式@Value注入:
其中@PropertySource指明要加载的配置文件
@Value("${}"),注入配置文件中的值
package com.xhx.springboot.config; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; /** * made by xuhaixing * 18-4-8 下午9:01 */ @Configuration //证明这是一个配置类 @PropertySource(value = {"classpath:test.properties"}, ignoreResourceNotFound = true)//可以放多个,{}里面用,分开 public class User { //可以不用set方法,直接就能注入,属于注入 @Value("${my.name}") private String name; @Value("${my.age}") private int age; @Value("${my.sex}") private String sex; public String getName() { return name; } public int getAge() { return age; } public String getSex() { return sex; } }
可以在controller中把user类注入,然后测试一下:
package com.xhx.springboot.controller; import com.xhx.springboot.config.User; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * made by xuhaixing * 18-4-8 下午9:48 */ @RestController public class HelloController { @Autowired private User user; @RequestMapping(value = "/getUser") public String getUser() { return user.getName() + " " + user.getSex() + " " + user.getAge(); } }
第二种方式 prefix:
package com.xhx.springboot.config; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; /** * made by xuhaixing * 18-4-8 下午9:58 */ @Configuration @PropertySource(value = "classpath:test.properties") @ConfigurationProperties(prefix = "my") //需要有set方法 public class UserPrefix { private String name; private int age; private String sex; public void setName(String name) { this.name = name; } public void setAge(int age) { this.age = age; } public void setSex(String sex) { this.sex = sex; } public String getName() { return name; } public int getAge() { return age; } public String getSex() { return sex; } }
然后注入到controller中,测试
package com.xhx.springboot.controller; import com.xhx.springboot.config.UserPrefix; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * made by xuhaixing * 18-4-8 下午10:01 */ @RestController @EnableConfigurationProperties({UserPrefix.class}) //激活配置,测试了一下,也可以没有 public class HelloPrefixController { @Autowired private UserPrefix userPrefix; @RequestMapping(value = "/getUserPrefix") public String getUserPrefix() { return userPrefix.getName() + " " + userPrefix.getSex() + " " + userPrefix.getAge(); } }