spring之動(dòng)態(tài)注冊bean
什么場景下，需要主動(dòng)向spring容器注冊bean呢？
如我之前做個(gè)的一個(gè)支持掃表的基礎(chǔ)平臺(tái)，使用者只需要添加基礎(chǔ)配置 + groovy任務(wù)，就可以丟到這個(gè)平臺(tái)上面來運(yùn)行了，而這個(gè)基礎(chǔ)平臺(tái)是一直都在運(yùn)行的，所以在新來任務(wù)時(shí)，最直觀需要注冊的就是 datasource 數(shù)據(jù)源這個(gè)bean了，那么可以怎么玩？
i. 主動(dòng)注冊bean支持
借助beandefinition來實(shí)現(xiàn)bean的定義，從最終的使用來看，代碼比較少，幾行而已
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public <t> t registerbean(string name, class<t> clazz, object... args) { beandefinitionbuilder beandefinitionbuilder = beandefinitionbuilder.genericbeandefinition(clazz); if (args.length > 0) { for (object arg : args) { beandefinitionbuilder.addconstructorargvalue(arg); } } beandefinition beandefinition = beandefinitionbuilder.getrawbeandefinition(); beandefinitionregistry beanfactory = (beandefinitionregistry) applicationcontext.getbeanfactory(); beanfactory.registerbeandefinition(name, beandefinition); return applicationcontext.getbean(name, clazz);} |
測試如下
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import com.github.hui.story.quickstory.server.visitservice;import lombok.tostring;import org.springframework.beans.factory.annotation.autowired;import org.springframework.beans.factory.config.beandefinition;import org.springframework.beans.factory.support.beandefinitionbuilder;import org.springframework.beans.factory.support.beandefinitionregistry;import org.springframework.context.configurableapplicationcontext;import org.springframework.stereotype.component;@componentpublic class beanholder { private final configurableapplicationcontext applicationcontext; public beanholder(configurableapplicationcontext applicationcontext) { this.applicationcontext = applicationcontext; initser(); } public void initser() { inrser ser = registerbean("test", inrser.class); ser.name = "一灰"; ser.uid = 22; system.out.println(ser); inrser ser2 = registerbean("test2", inrser.class, "一灰灰blog", 20); system.out.println(ser2); } @tostring public static class inrser { private string name; private integer uid; @autowired private visitservice visitservice; public inrser() { } public inrser(string name, integer uid) { this.name = name; this.uid = uid; } } private <t> t registerbean(string name, class<t> clazz, object... args) { beandefinitionbuilder beandefinitionbuilder = beandefinitionbuilder.genericbeandefinition(clazz); if (args.length > 0) { for (object arg : args) { beandefinitionbuilder.addconstructorargvalue(arg); } } beandefinition beandefinition = beandefinitionbuilder.getrawbeandefinition(); beandefinitionregistry beanfactory = (beandefinitionregistry) applicationcontext.getbeanfactory(); beanfactory.registerbeandefinition(name, beandefinition); return applicationcontext.getbean(name, clazz); }} |
輸出如下
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：https://segmentfault.com/a/1190000015887070
