Spring injects static member variables

Problems encountered in the work, in the tool class need to inject the static member variable value, and static member variables are loaded at the time of the class loading, so has been reported null pointer.

On the internet to find a few ways to record.

The first: Use the SET function injection.

 1   @Component  2  public   Class   Logutil { 3  4  private  static   Paylogdao Logdao;  5   @Autowired  6  public   void   Setlogdao (Paylogdao Logdao) { 7  Logutil.logdao = Logdao;  8  }  9  }

The second type: Use @PostConstructy annotations.

1 @Component2  Public classLogutil {3 @Autowired4     PrivatePaylogdao Logdao;5 6     Private StaticLogutil Logutil;7 8 @PostConstruct9     Private voidinit () {TenLogutil = This; One     } A  -      Public  Static voidWritesuccesslog (String ip,string mac,string clazz,string msg) { -Paylog log =NewPaylog (); the Log.setlogid (Idutil.getid ()); - LOG.SETLOGIP (IP); - Log.setlogmac (MAC); - log.setlogmsg (msg); + Log.setlogclass (clazz); - Log.setlogtime (Dateutil.getnowtime ()); +         Try{ A logUtil.logDao.writeLog (log); at}Catch(Exception e) { -             //catch exceptions, do not block business -         } -     } -}

The first one has not been tried, I use the second kind.

　　

　　

　　

Spring injects static member variables