系统初始化方式三：
application.properties配置
第一步：新建ThirdInitializer实现ApplicationContextInitializer接口
第一步.png
源码：
package com.xy.initializer;
import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.annotation.Order;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MapPropertySource;
import java.util.HashMap;
import java.util.Map;
@Order(2)
public class ThirdInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
@Override
public void initialize(ConfigurableApplicationContext applicationContext) {
ConfigurableEnvironment environment =applicationContext.getEnvironment();
Map<String,Object> map = new HashMap<String,Object>();
map.put("key3","value3");
MapPropertySource mapPropertySource = new MapPropertySource("thirdInitializer",map);
environment.getPropertySources().addLast(mapPropertySource);
System.out.println("Run thirdInitializer");
}
}
第二步：配置 application.properties
第二步.png
文件内容：
server.port=8080
spring.datasource.username=root
spring.datasource.password=root123
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/databasename
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.type-aliases-package=com.xy.sb2.bean
mybatis.configuration.map-underscore-to-camel-case=true
logging.pattern.console=[%thread] %-5level %logger{50} - %msg%n
context.initializer.classes=com.xy.initializer.ThirdInitializer
第三步：写一个测试类service
第三步.png
源代码：
package com.xy.service;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
@Component
public class TestService implements ApplicationContextAware {
private ApplicationContext applicationContext;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
System.out.println("test setApplicationContext......");
this.applicationContext = applicationContext;
}
public String test(){
System.out.println(applicationContext.getBean(DemoService.class));
DemoService t = applicationContext.getBean(DemoService.class);
return applicationContext.getEnvironment().getProperty("key3");
}
}
第四步：写一个controller测试
第四步.png
源码：
package com.xy.controller;
import com.xy.bean.Userinfo;
import com.xy.service.DemoService;
import com.xy.service.TestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.Optional;
@Controller
@RequestMapping("/demo")
public class UserInfoController {
@Autowired
private DemoService demoService;
@Autowired
private TestService testService;
@RequestMapping("/hello/{openid}")
@ResponseBody
public String hello(@PathVariable(value="openid") String openid){
return Optional.ofNullable(demoService.getUserInfoById(openid)).map(Userinfo::toString)
.orElse("empty String");
}
@RequestMapping("test")
@ResponseBody
public String test(){
return testService.test();
}
}
第五步：浏览器访问
http://localhost:8080/demo/test
第五步.png
