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引言：
Spring 传统项目配置http编码：
<filter>
<filter-name>CharacterEncoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
Spring Boot中没有配置，因使用自动配置帮我们设置好，那么到底是怎么自动配置的呢，下面我通过自定义自动配置来更进一步的了解它的原理。
正文
- 使用maven将我们要配置的类打成jar文件在本地仓库中，然后创建Spring Boot 项目使用验证。
- 话不多说，上代码
pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
<version>1.5.4.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies>
HelloServiceProper
//设置读取application.properties文件中的前缀
@ConfigurationProperties(prefix = "hello")
public class HelloServiceProper {
private static final String MSG = "world";
private String msg = MSG;
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
HelloService
自动装配的类
public class HelloService {
private String msg;
public String sayHello(){
return "Hello" + msg;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
HelloConfig
类加载
//项目启动时加载
@Configuration
//加载读取spring.factories文件
@EnableConfigurationProperties(HelloServiceProper.class)
//加载类别（当前路径加载类）
@ConditionalOnClass(HelloService.class)
@ConditionalOnProperty(prefix = "hello",value = "enabled", matchIfMissing = true)
public class HelloServiceConfig {
@Autowired
private HelloServiceProper helloServiceProper;
@Bean
@ConditionalOnMissingBean(HelloService.class)
public HelloService helloService(){
HelloService helloService = new HelloService();
helloService.setMsg(helloServiceProper.getMsg());
return helloService;
}
}
spring.factories
org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.ralap.auto.HelloServiceConfig
- 使用自定义配置
启动类
@RestController
@SpringBootApplication
public class UseautoApplication {
@Autowired
private HelloService helloService;
@GetMapping("/hello")
public String hello(){
return helloService.sayHello();
}
public static void main(String[] args) {
SpringApplication.run(UseautoApplication.class, args);
}
}
application.properties
hello.msg=hjx
- 效果
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