SpringBoot-获取上下文
1.创建上下文工具类SpringContextUtil，如下为简单的上下文工具类，可以根据自己的需要添加上下文相关的管理方法。
package com.supre.springboot;
import org.springframework.context.ApplicationContext;
public class SpringContextUtil {
private static ApplicationContext applicationContext;
//获取上下文
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
//设置上下文
public static void setApplicationContext(ApplicationContext applicationContext) {
SpringContextUtil.applicationContext = applicationContext;
}
//通过名字获取上下文中的bean
public static Object getBean(String name){
return applicationContext.getBean(name);
}
//通过类型获取上下文中的bean
public static Object getBean(Class<?> requiredType){
return applicationContext.getBean(requiredType);
}
}
2.在Springboot启动类中，向上下文工具类SpringContextUtil中注入applicationContext，如下：
package com.supre.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
@SpringBootApplication
public class App{
public static void main( String[] args ){
System.out.println( "Hello World!" );
ApplicationContext app = SpringApplication.run(App.class, args);
SpringContextUtil.setApplicationContext(app);
}
}
3.创建测试类TestController.java和Test.java，使用上下文工具类，如下：
package com.supre.springboot;
import org.springframework.stereotype.Component;
@Component
public class Test {
public String test(String str){
System.out.println("000000000000"+str);
return "test1"+str;
}
}
package com.supre.springboot;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
public class TestController {
private Logger logger = Logger.getLogger(TestController.class);
@RequestMapping("/test")
@ResponseBody
public String test(String str){
logger.info("test mesg");
Test test = (Test) SpringContextUtil.getBean("test");
Test test2 = (Test) SpringContextUtil.getBean(Test.class);
//如果未取到着为空
System.out.println(test);
System.out.println(test2);
return "test"+str;
}
}
注意：在上下文中能取到相关的bean，需要将bean注册到spring的上下文中，具体关于bean加入spring上下文的配置，参考：《SpringBoot-依赖注入》
4.启动SpringBoot启动类，访问：http://localhost:8080/test?str=add，参考控制台打印结果
参考地址：https://my.oschina.net/u/2391658/blog/732748
