{"id":40094,"date":"2022-12-03T10:08:44","date_gmt":"2023-06-25T15:10:01","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%b0%9d%e8%af%95%e5%9c%a8spring-boot-2-2-0%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%bb%b6%e8%bf%9f%e5%88%9d%e5%a7%8b%e5%8c%96%e3%80%82\/"},"modified":"2024-04-29T03:34:19","modified_gmt":"2024-04-28T19:34:19","slug":"%e6%88%91%e5%b0%9d%e8%af%95%e5%9c%a8spring-boot-2-2-0%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%bb%b6%e8%bf%9f%e5%88%9d%e5%a7%8b%e5%8c%96%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e5%b0%9d%e8%af%95%e5%9c%a8spring-boot-2-2-0%e4%b8%ad%e4%bd%bf%e7%94%a8%e5%bb%b6%e8%bf%9f%e5%88%9d%e5%a7%8b%e5%8c%96%e3%80%82\/","title":{"rendered":"\u6211\u5c1d\u8bd5\u5728Spring Boot 2.2.0\u4e2d\u4f7f\u7528\u5ef6\u8fdf\u521d\u59cb\u5316"},"content":{"rendered":"<h2>Spring Boot\u7248\u672c2.2.0<\/h2>\n<p>\u6700\u65b0\u7248\u672c\u7684Spring Boot v2.2.0\u5df2\u7ecf\u53d1\u5e03\u5e76\u6210\u4e3a\u4e86GA\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6211\u5011\u5c07\u5c0d\u5176\u4e2d\u4e00\u500b\u529f\u80fdLazyInitialization\u9032\u884c\u6aa2\u9a57\u3002<\/p>\n<p>Spring Boot 2.2.0<br \/>\n\u53d1\u5e03 v2.2.0.RELEASE \u00b7 spring-projects\/spring-boot \u00b7 GitHub<br \/>\nSpring Boot 2.2 \u53d1\u884c\u8bf4\u660e \u00b7 spring-projects\/spring-boot Wiki \u00b7 GitHub<br \/>\nSpring Boot \u53c2\u8003\u6587\u6863<\/p>\n<h2>\u73af\u5883<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Windows10<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">OracleJDK 13(build 13)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Spring Boot 2.2.0 RELEAS<\/ul>\n<h2>\u5efa\u7acb\u9879\u76ee<\/h2>\n<p>&#8220;\u5c06 Project \u8bbe\u5b9a\u4e3a Spring Initializr \u7684\u751f\u6210\u3002&#8221;<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d3e9737434c4406c8b510\/8-0.png\" alt=\"spring-initializr.PNG\" \/><\/div>\n<h2>Gradle \u662f\u4e00\u79cd\u6784\u5efa\u5de5\u5177\u3002<\/h2>\n<p>\u6211\u5df2\u786e\u8ba4\u5728\u4f7f\u7528Spring Initializr\u521b\u5efa\u7684Gradle\u9879\u76ee\u4e2d\u5e94\u7528\u4e86Gradle 5.6.2\u3002<\/p>\n<pre class=\"post-pre\"><code>&gt; gradlew -version\r\n\r\n------------------------------------------------------------\r\nGradle 5.6.2\r\n------------------------------------------------------------\r\n\r\nBuild time:   2019-09-05 16:13:54 UTC\r\nRevision:     55a5e53d855db8fc7b0e494412fc624051a8e781\r\n\r\nKotlin:       1.3.41\r\nGroovy:       2.5.4\r\nAnt:          Apache Ant(TM) version 1.9.14 compiled on March 12 2019\r\nJVM:          13-ea (Oracle Corporation 13-ea+33)\r\nOS:           Windows 10 10.0 amd64\r\n<\/code><\/pre>\n<h2>\u61d2\u52a0\u8f7d<\/h2>\n<p>Lazy Initialization\u662f\u6307\u5728\u8c03\u7528\u4e86\u76ee\u6807Bean\u4e4b\u540e\uff0c\u624d\u751f\u6210\u7531ApplicationContext\u7ba1\u7406\u7684Bean\uff0c\u800c\u4e0d\u662f\u5728\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\u65f6\uff08\u5373ApplicationContext\u521d\u59cb\u5316\u65f6\uff09\u8fdb\u884c\u751f\u6210\u3002<\/p>\n<p>\u8fd9\u4e2a\u673a\u5236\u5728\u4e4b\u524d\u7684\u7248\u672c\u4e2d\u4e5f\u5b58\u5728\uff0c\u4f46\u662f\u4ecev2.2.0\u5f00\u59cb\uff0c\u901a\u8fc7\u5c06propertyspring.main.lazy-initialization\u8bbe\u7f6e\u4e3atrue\uff0c\u53ef\u4ee5\u7edf\u4e00\u5e94\u7528\u5ef6\u8fdf\u521d\u59cb\u5316\u3002<\/p>\n<ul class=\"post-ul\">application.yml<\/ul>\n<pre class=\"post-pre\"><code><span class=\"na\">spring<\/span><span class=\"pi\">:<\/span>\r\n  <span class=\"na\">main<\/span><span class=\"pi\">:<\/span>\r\n    <span class=\"na\">lazy-initialization<\/span><span class=\"pi\">:<\/span> <span class=\"no\">true<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">Bean class<\/ul>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">jp.co.musako.domain.model<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">LazyInitializationDemoBean<\/span> <span class=\"o\">{<\/span>\r\n\r\n    <span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">message<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"nf\">LazyInitializationDemoBean<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">message<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">message<\/span> <span class=\"o\">=<\/span> <span class=\"n\">message<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"call constructor \"<\/span> <span class=\"o\">+<\/span> <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">message<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">writer<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">message<\/span><span class=\"o\">){<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">message<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\" is \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">message<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">config class<\/ul>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">jp.co.musako.config<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">jp.co.musako.domain.model.LazyInitializationDemoBean<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.annotation.Bean<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.annotation.Configuration<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"nd\">@Configuration<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Config<\/span> <span class=\"o\">{<\/span>\r\n\r\n    <span class=\"nd\">@Bean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lazyInitializationDemoBean1\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">LazyInitializationDemoBean<\/span> <span class=\"nf\">lazyInitializationDemoBean1<\/span><span class=\"o\">(){<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">LazyInitializationDemoBean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"create lazyInitializationDemoBean1\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@Bean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lazyInitializationDemoBean2\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">LazyInitializationDemoBean<\/span> <span class=\"nf\">lazyInitializationDemoBean2<\/span><span class=\"o\">(){<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">LazyInitializationDemoBean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"create lazyInitializationDemoBean2\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">main class<\/ul>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">jp.co.musako<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">jp.co.musako.domain.model.LazyInitializationDemoBean<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.boot.SpringApplication<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.boot.autoconfigure.SpringBootApplication<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.ApplicationContext<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"nd\">@SpringBootApplication<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Application<\/span> <span class=\"o\">{<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">ApplicationContext<\/span> <span class=\"n\">ctx<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">SpringApplication<\/span><span class=\"o\">.<\/span><span class=\"na\">run<\/span><span class=\"o\">(<\/span><span class=\"nc\">Application<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">,<\/span> <span class=\"n\">args<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Initialize Application Context\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"nc\">LazyInitializationDemoBean<\/span> <span class=\"n\">bean1<\/span> <span class=\"o\">=<\/span> <span class=\"n\">ctx<\/span><span class=\"o\">.<\/span><span class=\"na\">getBean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lazyInitializationDemoBean1\"<\/span><span class=\"o\">,<\/span> <span class=\"nc\">LazyInitializationDemoBean<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">bean1<\/span><span class=\"o\">.<\/span><span class=\"na\">writer<\/span><span class=\"o\">(<\/span><span class=\"s\">\"first bean\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"nc\">LazyInitializationDemoBean<\/span> <span class=\"n\">bean2<\/span> <span class=\"o\">=<\/span> <span class=\"n\">ctx<\/span><span class=\"o\">.<\/span><span class=\"na\">getBean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lazyInitializationDemoBean2\"<\/span><span class=\"o\">,<\/span> <span class=\"nc\">LazyInitializationDemoBean<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">bean2<\/span><span class=\"o\">.<\/span><span class=\"na\">writer<\/span><span class=\"o\">(<\/span><span class=\"s\">\"second bean\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<\/code><\/pre>\n<p>\u8fd0\u884c\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>&gt;gradlew bootRun\r\n\r\n&gt; Task :bootRun\r\n\r\n2019-10-23 18:16:37.620  INFO 12708 --- [           main] jp.co.musako.Application                 : Started Application in 4.295 seconds (JVM running for 4.933)\r\nInitialize Application Context\r\ncall constructor lazyInitializationDemoBean1\r\nlazyInitializationDemoBean1 is first bean\r\ncall constructor lazyInitializationDemoBean2\r\nlazyInitializationDemoBean2 is second bean\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u91cc\uff0c\u53ef\u4ee5\u770b\u51fa\u4ee5\u4e0b\u6b65\u9aa4\u7684\u5904\u7406\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8<\/ol>\n<\/li>\n<\/ol>\n<p>\u5728\u542f\u52a8\u540e\u8f93\u51fa&#8221;\u521d\u59cb\u5316\u5e94\u7528\u7a0b\u5e8f\u4e0a\u4e0b\u6587&#8221;<\/p>\n<p>\u751f\u6210Bean<\/p>\n<p>\u5728Bean\u7684\u6784\u9020\u51fd\u6570\u4e2d\u8f93\u51fa&#8221;\u8c03\u7528\u6784\u9020\u51fd\u6570lazyInitializationDemoBean1&#8243;<\/p>\n<p>\u8c03\u7528\u751f\u6210\u7684Bean\u7684writer\u65b9\u6cd5<\/p>\n<p>\u5728writer\u65b9\u6cd5\u4e2d\u8f93\u51fa&#8221;lazyInitializationDemoBean1\u662f\u7b2c\u4e00\u4e2aBean&#8221;<\/p>\n<h2>\u61d2\u52a0\u8f7d\u7684\u4f8b\u5916\u5e94\u7528<\/h2>\n<p>\u5728\u9879\u76ee\u4e2d\u5e94\u7528LazyInitialization\u5e76\u5c06\u7279\u5b9a\u7684Bean\u6392\u9664\u5728LazyInitialization\u4e4b\u5916\uff0c\u60a8\u53ef\u4ee5\u91c7\u53d6\u4ee5\u4e0b\u65b9\u5f0f\u8bbe\u7f6espring.main.lazy-initialization=true\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5c06@org.springframework.context.annotation.Lazy(false)\u8bbe\u7f6e\u4e3aBean<\/ol>\n<\/li>\n<\/ol>\n<p>\u61d2\u52a0\u8f7d (Spring Framework 5.2.0.RELEASE API)<\/p>\n<p>\u5728org.springframework.boot.LazyInitializationExcludeFilter\u4e2d\u6ce8\u518c\u8981\u6392\u9664\u7684Bean<\/p>\n<p>\u61d2\u52a0\u8f7d\u6392\u9664\u8fc7\u6ee4\u5668 (Spring Boot Docs 2.2.0.BUILD-SNAPSHOT API)<\/p>\n<ul class=\"post-ul\">config class<\/ul>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">jp.co.musako.config<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">jp.co.musako.domain.model.ExcludeLazyInitializationDemoBean<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">jp.co.musako.domain.model.LazyInitializationDemoBean<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.boot.LazyInitializationExcludeFilter<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.annotation.Bean<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.annotation.Configuration<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.annotation.Lazy<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"nd\">@Configuration<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Config<\/span> <span class=\"o\">{<\/span>\r\n\r\n    <span class=\"nd\">@Bean<\/span>\r\n    <span class=\"kd\">static<\/span> <span class=\"nc\">LazyInitializationExcludeFilter<\/span> <span class=\"nf\">integrationLazyInitExcludeFilter<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nc\">LazyInitializationExcludeFilter<\/span><span class=\"o\">.<\/span><span class=\"na\">forBeanTypes<\/span><span class=\"o\">(<\/span><span class=\"nc\">ExcludeLazyInitializationDemoBean<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"c1\">\/\/ Lazy Initialization\u9069\u7528\u5bfe\u8c61<\/span>\r\n    <span class=\"nd\">@Bean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lazyInitializationDemoBean1\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">LazyInitializationDemoBean<\/span> <span class=\"nf\">lazyInitializationDemoBean1<\/span><span class=\"o\">(){<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">LazyInitializationDemoBean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lazyInitializationDemoBean1\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"c1\">\/\/ Lazy Initialization\u9069\u7528\u5bfe\u8c61\u5916<\/span>\r\n    <span class=\"nd\">@Bean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lazyInitializationDemoBean2\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"nd\">@Lazy<\/span><span class=\"o\">(<\/span><span class=\"kc\">false<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">LazyInitializationDemoBean<\/span> <span class=\"nf\">lazyInitializationDemoBean2<\/span><span class=\"o\">(){<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">LazyInitializationDemoBean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lazyInitializationDemoBean2\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"c1\">\/\/ Lazy Initialization\u9069\u7528\u5bfe\u8c61\u5916<\/span>\r\n    <span class=\"nd\">@Bean<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">ExcludeLazyInitializationDemoBean<\/span> <span class=\"nf\">ExcludeLazyInitializationDemoBean<\/span><span class=\"o\">(){<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">ExcludeLazyInitializationDemoBean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"excludeLazyInitializationDemoBean\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">main class<\/ul>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">jp.co.musako<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">jp.co.musako.domain.model.ExcludeLazyInitializationDemoBean<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">jp.co.musako.domain.model.LazyInitializationDemoBean<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.boot.SpringApplication<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.boot.autoconfigure.SpringBootApplication<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.springframework.context.ApplicationContext<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"nd\">@SpringBootApplication<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Application<\/span> <span class=\"o\">{<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">ApplicationContext<\/span> <span class=\"n\">ctx<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">SpringApplication<\/span><span class=\"o\">.<\/span><span class=\"na\">run<\/span><span class=\"o\">(<\/span><span class=\"nc\">Application<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">,<\/span> <span class=\"n\">args<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Initialize Application Context\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"nc\">LazyInitializationDemoBean<\/span> <span class=\"n\">bean1<\/span> <span class=\"o\">=<\/span> <span class=\"n\">ctx<\/span><span class=\"o\">.<\/span><span class=\"na\">getBean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lazyInitializationDemoBean1\"<\/span><span class=\"o\">,<\/span> <span class=\"nc\">LazyInitializationDemoBean<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">bean1<\/span><span class=\"o\">.<\/span><span class=\"na\">writer<\/span><span class=\"o\">(<\/span><span class=\"s\">\"first bean\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"nc\">LazyInitializationDemoBean<\/span> <span class=\"n\">bean2<\/span> <span class=\"o\">=<\/span> <span class=\"n\">ctx<\/span><span class=\"o\">.<\/span><span class=\"na\">getBean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"lazyInitializationDemoBean2\"<\/span><span class=\"o\">,<\/span> <span class=\"nc\">LazyInitializationDemoBean<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">bean2<\/span><span class=\"o\">.<\/span><span class=\"na\">writer<\/span><span class=\"o\">(<\/span><span class=\"s\">\"second bean\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"nc\">ExcludeLazyInitializationDemoBean<\/span> <span class=\"nc\">ExcludeLazyInitializationBean<\/span> <span class=\"o\">=<\/span> <span class=\"n\">ctx<\/span><span class=\"o\">.<\/span><span class=\"na\">getBean<\/span><span class=\"o\">(<\/span><span class=\"s\">\"ExcludeLazyInitializationDemoBean\"<\/span><span class=\"o\">,<\/span> <span class=\"nc\">ExcludeLazyInitializationDemoBean<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">ExcludeLazyInitializationBean<\/span><span class=\"o\">.<\/span><span class=\"na\">writer<\/span><span class=\"o\">(<\/span><span class=\"s\">\"third bean\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n<span class=\"o\">}<\/span>\r\n\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u5b9f\u884c\u7d50\u679c<\/ul>\n<pre class=\"post-pre\"><code>&gt;gradlew bootRun\r\n\r\n&gt; Task :bootRun\r\n\r\ncall constructor lazyInitializationDemoBean2\r\ncall constructor excludeLazyInitializationDemoBean\r\n2019-10-23 18:52:52.464  INFO 6004 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''\r\n2019-10-23 18:52:52.468  INFO 6004 --- [           main] jp.co.musako.Application                 : Started Application in 2.978 seconds (JVM running for 3.454)\r\nInitialize Application Context\r\ncall constructor lazyInitializationDemoBean1\r\nlazyInitializationDemoBean1 is first bean\r\nlazyInitializationDemoBean2 is second bean\r\nexcludeLazyInitializationDemoBean is third bean\r\n<\/code><\/pre>\n<p>\u5982\u4e0a\u6240\u793a\uff0c\u5728Config.java\u6587\u4ef6\u4e2d\u5b9a\u4e49\u7684\u4e09\u4e2aBean\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u53ea\u6709lazyInitializationDemoBean1\u4f1a\u88ab\u61d2\u52a0\u8f7d\u3002<\/p>\n<p>\u8fd9\u91cc\u6709\u6e90\u4ee3\u7801\uff1aGitHub &#8211; forests-k\/spring-boot-lazy-initialization<br \/>\nSpring Boot v2.2.0\u7684\u5ef6\u8fdf\u521d\u59cb\u5316\u793a\u4f8b<\/p>\n<h2>\u5728\u5e94\u7528\u61d2\u60f0\u521d\u59cb\u5316\u65f6\u9700\u8981\u8003\u8651\u7684\u95ee\u9898<\/h2>\n<p>\u5f15\u5165\u60f0\u6027\u521d\u59cb\u5316\u7684\u4f18\u70b9\u5728\u4e8e\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\u901f\u5ea6\uff0c\u5e76\u5728\u9700\u8981\u65f6\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u4e0d\u6d6a\u8d39\u5185\u5b58\u3002<\/p>\n<p>\u7136\u800c\uff0c\u5728\u5fc5\u8981\u65f6\u521d\u59cb\u5316Bean\u5e76\u5c06\u5176\u4fdd\u5b58\u5728\u5bb9\u5668\u4e2d\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u4ee5\u524d\u7684Bean\u751f\u547d\u5468\u671f\u7684\u67d0\u4e9b\u53d8\u5316\uff0c\u800c\u4e14\u65e0\u6cd5\u9884\u89c1\u5bb9\u5668\u4e2d\u6700\u5927\u53ef\u80fd\u4fdd\u6301\u7684Bean\u6570\u91cf\uff08\u5373\u5360\u7528\u7684\u5185\u5b58\u91cf\uff09\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bf9CPU\u8d1f\u8f7d\u548c\u8d1f\u8f7d\u5e73\u5747\u503c\u4ea7\u751f\u5f71\u54cd\uff0c\u56e0\u6b64\u4e0d\u80fd\u8fc7\u5206\u4f9d\u8d56LazyInitialization\uff0c\u8fd9\u662f\u6709\u53ef\u80fd\u7684\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u4f3c\u4e4e\u5e94\u8be5\u8003\u8651\u5728\u6d4b\u8bd5\u73af\u5883\u6216\u7c7b\u4f3c\u751f\u4ea7\u73af\u5883\u4e2d\u8fdb\u884c\u4e00\u4e9b\u6d4b\u8bd5\uff0c\u4f8b\u5982\u6682\u65f6\u7981\u7528\u5ef6\u8fdf\u521d\u59cb\u5316\u3002<\/p>\n<h2>\u76d7\u7a83\u662f\u4e00\u79cd\u72af\u7f6a\u884c\u4e3a\uff0c\u6307\u7684\u662f\u975e\u6cd5\u83b7\u53d6\u4ed6\u4eba\u8d22\u7269\u3002<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Lazy Initialization in Spring Boot 2.2<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Spring Boot Reference Documentation<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">appendix Common Application properties<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Spring Boot\u7248\u672c2.2.0 \u6700\u65b0\u7248\u672c\u7684Spring Boot v2.2.0\u5df2\u7ecf\u53d1\u5e03\u5e76\u6210\u4e3a\u4e86GA\u3002 \u56e0 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-40094","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO 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