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
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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
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@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
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@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,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:https://www.cnblogs.com/sylarken/archive/2018/08/07/9435076.html