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
如对本文有疑问, 点击进行留言回复!!
【奥鹏作业答案库网】大工20春《应用统计》在线作业1【奥鹏作业答案】
网友评论