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);
}
}
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(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!" );
}
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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" );
}
}
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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