springboot中bean的手动注入
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前一段时间学习springboot，遇到bean手动注入的问题，搞了很久终于弄出来了，废话不多说直接上代码：
1.下面示例为实现ApplicationContextAware 的工具类，可以通过其它类引用它以操作spring容器及其中的Bean实例。

package com.springbootMybatis.common.tool;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
/**

• ContextUtils注册
• bean的手动注入
• 实现ApplicationContextAware接口
  */
  @Component
  public class ApplicationContextRegister implements ApplicationContextAware {
  public void setApplicationContext(ApplicationContext applicationContext)
  throws BeansException {
  ContextUtils.setApplicationContext(applicationContext);
  }
  }

2.写个工具类

package com.springbootMybatis.common.tool;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.ApplicationContext;
//import groovy.util.logging.Slf4j;
import java.util.Map;

/**

• spring上下文工具类

• bean 的手动注入工具类
  */
  @Slf4j
  public class ContextUtils {
  private static ApplicationContext applicationContext;
  public static void setApplicationContext(ApplicationContext applicationContext) {
  synchronized (ContextUtils.class) {
  ContextUtils.applicationContext = applicationContext;
  ContextUtils.class.notifyAll();
  }
  }

  public static ApplicationContext getApplicationContext() {
  synchronized (ContextUtils.class) {
  while (applicationContext == null) {
  try {
  log.debug(“getApplicationContext, wait…”);
  ContextUtils.class.wait(60000);
  if (applicationContext == null) {
  log.warn(“Have been waiting for ApplicationContext to be set for 1 minute”, new Exception());
  }
  } catch (InterruptedException ex) {
  log.debug(“getApplicationContext, wait interrupted”);
  }
  }
  return applicationContext;
  }
  }

  /**

  • 根据名字获取实体
  • @param name
  • @return
    */
    public static Object getBean(String name) {
    return getApplicationContext().getBean(name);
    }

  /**

  • 根据类型获取实体
  • @param
  • @param cls
  • @return
    */
    public static Map<String, T> getBeansOfType(Class cls) {
    return getApplicationContext().getBeansOfType(cls);
    }

}
3.写个手动注入的测试方法

package com.springbootMybatis.common.tool;
import com.springbootMybatis.demo.service.UserService;
import com.springbootMybatis.demo.utils.GeneralReturn;
/**

• bean的手动注入测试
• @author Administrator

*/
public class beanInjection {
private static UserService UserService = (com.springbootMybatis.demo.service.UserService) ContextUtils.getBean(“UserServiceImpl”);
public static GeneralReturn aaa() {
GeneralReturn GR = UserService.selectAll();
System.out.println(GR);
return GR;
}
}

4.在这展示一下接口，具体怎么业务层代码和持久层代码就不贴了。

package com.springbootMybatis.demo.controller;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.springbootMybatis.common.tool.beanInjection;
import com.springbootMybatis.demo.service.UserService;
import com.springbootMybatis.demo.utils.GeneralReturn;
@RestController
@RequestMapping
@Slf4j
public class test {
@Autowired
private UserService UserService;
/**
* bean的自动注入
* @return
/
@RequestMapping("/test1")
public GeneralReturn test(){
return UserService.selectAll();
}
/*
* bean的手动注入
* @return
*/
@RequestMapping("/test2")
public GeneralReturn test2(){
return beanInjection.aaa();
}
}

最后我要提醒一下，在写service的实现时候，注解@Service(“UserServiceImpl”)需要bean的名称不然找不到。
各位老铁，我是新手，接触springboot框架不久，写的不对的请指教。

项目源码：https://github.com/PythonDjangoWeb/springbootMybatis.git