解决Springboot @Autowired 无法注入问题

特别提醒：一定要注意文件结构

　　webappapplication 一定要在包的最外层，否则spring无法对所有的类进行托管，会造成@autowired 无法注入。

1.　　添加工具类获取在 spring 中托管的 bean

　　（1）工具类

package com.common;
import org.springframework.beans.beansexception;
import org.springframework.beans.factory.nosuchbeandefinitionexception;
import org.springframework.context.applicationcontext;
import org.springframework.context.applicationcontextaware;
/**
 * @program: ipc_1p
 * @description: 获取在spring中托管的bean
 * @author: johnny
 * @create: 2018-08-03 16:24
 **/
public class springcontextutil {
  private static applicationcontext applicationcontext; // spring应用上下文
  // 下面的这个方法上加了@override注解，原因是继承applicationcontextaware接口是必须实现的方法
  public static void setapplicationcontext(applicationcontext applicationcontext)
      throws beansexception {
    springcontextutil.applicationcontext = applicationcontext;
  }
  public static applicationcontext getapplicationcontext() {
    return applicationcontext;
  }
  public static object getbean(string name) throws beansexception {
    return applicationcontext.getbean(name);
  }
  public static object getbean(string name, class requiredtype)
      throws beansexception {
    return applicationcontext.getbean(name, requiredtype);
  }
  public static boolean containsbean(string name) {
    return applicationcontext.containsbean(name);
  }
  public static boolean issingleton(string name)
      throws nosuchbeandefinitionexception {
    return applicationcontext.issingleton(name);
  }
  public static class gettype(string name)
      throws nosuchbeandefinitionexception {
    return applicationcontext.gettype(name);
  }
  public static string[] getaliases(string name)
      throws nosuchbeandefinitionexception {
    return applicationcontext.getaliases(name);
  }
}

　　（2）使用

　　　　1）程序启动时，实例化 springcontextutil

@springbootapplication
public class webappapplication {
  private static applicationcontext applicationcontext;
  public static void main(string[] args) {
    applicationcontext = springapplication.run(webappapplication.class, args);
    //
    springcontextutil springcontextutil = new springcontextutil();
    springcontextutil.setapplicationcontext(applicationcontext);
    system.out.println("服务器启动测试!");
}

　　　　2）在使用 @service 的方法中，通过@autowired 注入，使用springcontexutil 获取bean上下文

@autowired
  senderservice senderservice;
public class package_state {
  @autowired
  senderservice senderservice;
  @component
  private package_state() {
    senderservice = (senderservice)springcontextutil.getbean("senderservice");
  }
}

总结

以上所述是小编给大家介绍的解决springboot @autowired 无法注入问题，希望对大家有所帮助