{"id":5221,"date":"2024-08-01T22:47:42","date_gmt":"2024-08-01T14:47:42","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=5221"},"modified":"2024-08-01T22:47:42","modified_gmt":"2024-08-01T14:47:42","slug":"%e4%b8%80%e6%96%87%e6%90%9e%e6%87%82-spring-%e5%be%aa%e7%8e%af%e4%be%9d%e8%b5%96","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/spring-boot\/%e4%b8%80%e6%96%87%e6%90%9e%e6%87%82-spring-%e5%be%aa%e7%8e%af%e4%be%9d%e8%b5%96\/","title":{"rendered":"\u4e00\u6587\u641e\u61c2 Spring \u5faa\u73af\u4f9d\u8d56"},"content":{"rendered":"
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<\/span>\u4e00 \u5faa\u73af\u4f9d\u8d56<\/span><\/span><\/h1>\n

<\/span>1.1 \u4ec0\u4e48\u662f\u5faa\u73af\u4f9d\u8d56<\/span><\/span><\/h2>\n

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<\/span>private<\/span>ObjectbuildLazyResolutionProxy<\/span>(final<\/span>DependencyDescriptordescriptor,final<\/span>@NullableStringbeanName,boolean<\/span>classOnly)<\/span><\/span>{BeanFactorybeanFactory=getBeanFactory();final<\/span>DefaultListableBeanFactorydlbf=(DefaultListableBeanFactory)beanFactory;TargetSourcets=new<\/span>TargetSource(){@Override<\/span>public<\/span>Class<?>getTargetClass(){return<\/span>descriptor.getDependencyType();}@Override<\/span>public<\/span>boolean<\/span>isStatic<\/span>()<\/span><\/span>{return<\/span>false<\/span>;}@Override<\/span>public<\/span>ObjectgetTarget<\/span>()<\/span><\/span>{Set<String>autowiredBeanNames=(beanName!=null<\/span>?new<\/span>LinkedHashSet<>(1<\/span>):null<\/span>);Objecttarget=dlbf.doResolveDependency(descriptor,beanName,autowiredBeanNames,null<\/span>);if<\/span>(target==null<\/span>){Class<?>type=getTargetClass();if<\/span>(Map.class<\/span><\/span>==type){return<\/span>Collections.emptyMap();}else<\/span>if<\/span>(List.class<\/span><\/span>==type){return<\/span>Collections.emptyList();}else<\/span>if<\/span>(Set.class<\/span><\/span>==type||Collection.class<\/span><\/span>==type){return<\/span>Collections.emptySet();}throw<\/span>new<\/span>NoSuchBeanDefinitionException(descriptor.getResolvableType(),\"Optionaldependencynotpresentforlazyinjectionpoint\"<\/span>);}if<\/span>(autowiredBeanNames!=null<\/span>){for<\/span>(StringautowiredBeanName:autowiredBeanNames){if<\/span>(dlbf.containsBean(autowiredBeanName)){dlbf.registerDependentBean(autowiredBeanName,beanName);}}}return<\/span>target;}@Override<\/span>public<\/span>void<\/span>releaseTarget<\/span>(Objecttarget)<\/span><\/span>{}};ProxyFactorypf=new<\/span>ProxyFactory();pf.setTargetSource(ts);Class<?>dependencyType=descriptor.getDependencyType();if<\/span>(dependencyType.isInterface()){pf.addInterface(dependencyType);}ClassLoaderclassLoader=dlbf.getBeanClassLoader();return<\/span>(classOnly?pf.getProxyClass(classLoader):pf.getProxy(classLoader));}<\/code><\/pre>\n
\u540e\u7eed\u7684\u903b\u8f91\u6211\u5c31\u4e0d\u518d\u591a\u8bf4\u4e86\uff0c\u5c0f\u4f19\u4f34\u4eec\u53c2\u8003\u6700\u65b0\u7248 Spring \u6e90\u7801\u89c6\u9891\u6559\u7a0b<\/a>\u5373\u53ef\u3002<\/p>\n
\u597d\u5566\uff0c\u73b0\u5728\u5c0f\u4f19\u4f34\u4eec\u660e\u767d\u4e86 @Lazy \u6ce8\u89e3\u662f\u5982\u4f55\u89e3\u51b3 Spring \u5faa\u73af\u4f9d\u8d56\u4e86\u5427\uff5e<\/p>\n
\u867d\u7136\u89e3\u51b3\u4e86\uff0c\u4f46\u662f\u6211\u4eec\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d\uff0c\u8981\u662f\u80fd\u907f\u514d\u5faa\u73af\u4f9d\u8d56\u8fd8\u662f\u8981\u53bb\u907f\u514d\uff5e<\/p>\n<\/section>\n
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