{"id":524,"date":"2021-09-22T14:31:47","date_gmt":"2021-09-22T06:31:47","guid":{"rendered":"https:\/\/explause.com\/?p=524"},"modified":"2021-09-22T14:31:47","modified_gmt":"2021-09-22T06:31:47","slug":"%e4%be%9d%e8%b5%96","status":"publish","type":"post","link":"https:\/\/devdoge.org\/?p=524","title":{"rendered":"\u4f9d\u8d56"},"content":{"rendered":"\n

\u4f9d\u8d56\u6ce8\u5165\uff1a\u5bf9\u8c61\u901a\u8fc7\u901a\u8fc7\u6784\u9020\u5668\u6216\u5de5\u5382\u65b9\u6cd5\u53c2\u6570\u6216\u5b9e\u4f8b\u5316\u4e4b\u540e\u901a\u8fc7\u65b9\u6cd5\u8bbe\u7f6e\u7684\u8fc7\u7a0b\u5b9a\u4e49\u4f9d\u8d56\u3002<\/p>\n\n\n\n

\u5206\u4e3a\u4e24\u79cd\uff1a\u57fa\u4e8e\u6784\u9020\u5668\u7684\u4f9d\u8d56\u6ce8\u5165\u548c\u57fa\u4e8esetter\u65b9\u6cd5\u7684\u4f9d\u8d56\u6ce8\u5165\u3002<\/p>\n\n\n\n

\u9009\u62e9\u54ea\u79cd\u65b9\u5f0f\uff1a\u4f7f\u7528\u6784\u9020\u5668\u786e\u5b9a\u5f3a\u5236\u8981\u6c42\u7684\u4f9d\u8d56\uff0csetter\u65b9\u6cd5\u7528\u4e8e\u53ef\u9009\u7684\u4f9d\u8d56\u3002<\/p>\n\n\n\n

@Required\u6ce8\u89e3\u4f5c\u7528\u4e8esetter\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u83b7\u5f97\u5f3a\u5236\u7684\u6548\u679c\uff0c\u4f46\u662f\u6784\u9020\u5668\u6ce8\u5165\u662f\u7f16\u7a0b\u7ea7\u522b\u7684\uff0c\u4e0d\u5bb9\u6613\u51fa\u95ee\u9898\u3002<\/p>\n\n\n\n

Spring\u56e2\u961f\u62e5\u62a4\u6784\u9020\u5668\u6ce8\u5165\u3002\u6784\u9020\u5668\u6ce8\u5165\u603b\u662f\u8fd4\u56de\u5b8c\u5168\u521d\u59cb\u5316\u7684\u72b6\u6001\u3002<\/em><\/strong><\/p>\n\n\n\n

setter\u65b9\u6cd5\u6ce8\u5165\u4e3b\u8981\u7528\u4e8e\u53ef\u9009\u7684\u4f9d\u8d56\uff0c\u800c\u4e14\u6709\u5408\u9002\u7684\u9ed8\u8ba4\u503c\uff0c\u5426\u5219\u5c31\u8981\u5230\u5904\u8fdb\u884cnot-null\u68c0\u67e5\u3002<\/p>\n\n\n\n

\u4e00\u4e2a\u4f7f\u7528setter\u65b9\u6cd5\u7684\u597d\u5904\u662f\u53ef\u4ee5\u5728\u521d\u59cb\u5316\u4e4b\u540e\u91cd\u65b0\u8bbe\u7f6e\u6216\u91cd\u65b0\u6ce8\u5165\u4f9d\u8d56\u3002<\/p>\n\n\n\n

Constructor-based<\/em><\/strong><\/p>\n\n\n\n

\u57fa\u4e8e\u6784\u9020\u5668\u7684\u4f9d\u8d56\u6ce8\u5165\uff1a\u5bb9\u5668\u8c03\u7528\u6784\u9020\u51fd\u6570\uff0c\u5e76\u63d0\u4f9b\u76f8\u5bf9\u5e94\u6570\u91cf\u7684\u53c2\u6570\uff0c\u6bcf\u4e2a\u53c2\u6570\u5bf9\u5e94\u4e00\u4e2a\u4f9d\u8d56\u3002<\/p>\n\n\n\n

\u548c\u901a\u8fc7\u8c03\u7528\u9759\u6001\u5de5\u5382\u65b9\u6cd5\u5e76\u63d0\u4f9b\u4e00\u5b9a\u6570\u91cf\u53c2\u6570\u5dee\u4e0d\u591a\u7b49\u4ef7\uff0c\u56e0\u4e3a\u53c2\u6570\u7528\u6cd5\u90fd\u7c7b\u4f3c\u3002<\/p>\n\n\n\n

\u6784\u9020\u5668\u53c2\u6570\u89e3\u6790<\/strong>\uff1a\u901a\u8fc7\u53c2\u6570\u7c7b\u578b\u5224\u65ad\uff0c\u5982\u679c\u7c7b\u578b\u4e00\u6837\u5c31\u6309\u987a\u5e8f\u4e00\u4e00\u5bf9\u5e94\u3002<\/p>\n\n\n\n

\u6784\u9020\u5668\u53c2\u6570\u7c7b\u578b\u5339\u914d<\/strong>\uff1a\u53ef\u4ee5\u5728<constructor-arg\/>\u5143\u7d20\u91cc\u63d0\u4f9btype\u5c5e\u6027\u660e\u786e\u58f0\u660e\u53c2\u6570\u7c7b\u578b\uff1a<\/p>\n\n\n\n

<bean id=\"exampleBean\" class=\"examples.ExampleBean\">\n    <constructor-arg type=\"int\" value=\"7500000\"\/>\n    <constructor-arg type=\"java.lang.String\" value=\"42\"\/>\n<\/bean><\/code><\/pre>\n\n\n\n
\u6784\u9020\u5668\u53c2\u6570\u7d22\u5f15<\/strong>\uff1a\u53ef\u4ee5\u5728<constructor-arg\/>\u5143\u7d20\u63d0\u4f9bindex\u5c5e\u6027\u6307\u5b9a\u53c2\u6570\u4f4d\u7f6e\uff0c\u4ece0\u5f00\u59cb\u8ba1\u7b97\uff1a<\/p>\n\n\n\n
<bean id=\"exampleBean\" class=\"examples.ExampleBean\">\n    <constructor-arg index=\"0\" value=\"7500000\"\/>\n    <constructor-arg index=\"1\" value=\"42\"\/>\n<\/bean><\/code><\/pre>\n\n\n\n
\u6784\u9020\u5668\u53c2\u6570\u540d<\/strong>\uff1a\u901a\u8fc7\u6784\u9020\u51fd\u6570\u53c2\u6570\u7684\u540d\u5b57\u533a\u5206\uff1a<\/p>\n\n\n\n
<bean id=\"exampleBean\" class=\"examples.ExampleBean\">\n    <constructor-arg name=\"years\" value=\"7500000\"\/>\n    <constructor-arg name=\"ultimateAnswer\" value=\"42\"\/>\n<\/bean><\/code><\/pre>\n\n\n\n
Setter-based<\/strong>\uff1a<bean\/>\u5143\u7d20\u7684<property\/>\u5b50\u5143\u7d20\u8bbe\u7f6e\uff0cname\u5c5e\u6027\u662fbean\u7c7b\u91cc\u9762setXXXX\u65b9\u6cd5\u7684XXXX\uff1a<\/p>\n\n\n\n
<bean id=\"exampleBean\" class=\"examples.ExampleBean\">\n    <property name=\"stringProperty\" value=\"valueName\"\/>\n    <property name=\"integerProperty\" value=\"1\"\/>\n<\/bean><\/code><\/pre>\n\n\n\n
public class ExampleBean {\n\n    private String stringProperty;\n    private int i;\n\n    public void setStringProperty(String stringProperty) {\n        this.stringProperty = stringProperty;\n    }\n\n    public void setIntegerProperty(int i) {\n        this.i = i;\n    }\n}<\/code><\/pre>\n\n\n\n
<property\/>\u5b50\u5143\u7d20\u4e5f\u6709ref\u5c5e\u6027\uff0c\u53ef\u4ee5\u5f15\u7528\u522b\u7684bean\u3002<\/p>\n\n\n\n
\u4f9d\u8d56\u89e3\u6790\u8fc7\u7a0b<\/em><\/strong><\/p>\n\n\n\n
\u5bb9\u5668\u8fdb\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n\n\n\n
ApplicationContext\u88ab\u521b\u5efa\uff0c\u5e76\u7528\u63cf\u8ff0\u6240\u6709bean\u4fe1\u606f\u7684\u914d\u7f6e\u5143\u6570\u636e\u521d\u59cb\u5316\u3002 \u914d\u7f6e\u5143\u6570\u636e\u53ef\u4ee5\u662fJava\u6ce8\u89e3\u3001xml\u6587\u4ef6\u6216Java\u4ee3\u7801\uff1b<\/td><\/tr>
\u5bf9\u4e8e\u6bcf\u4e2abean\uff0c\u5b83\u4eec\u7684\u4f9d\u8d56\u88ab\u8868\u8fbe\u6210\u6784\u9020\u5668\u53c2\u6570\u3001\u9759\u6001\u5de5\u5382\u65b9\u6cd5\u53c2\u6570\u6216\u8005\u5c5e\u6027\uff0c\u5f53bean\u88ab\u521b\u5efa\u7684\u65f6\u5019\u63d0\u4f9b\u7ed9bean\uff1b<\/td><\/tr>
\u6bcf\u4e2a\u5c5e\u6027\u6216\u53c2\u6570\u90fd\u662f\u5b9e\u9645\u8981\u8bbe\u7f6e\u7684\u503c\uff0c\u6216\u8005\u5bf9\u5bb9\u5668\u5185\u522b\u7684bean\u7684\u5f15\u7528\uff1b<\/td><\/tr>
\u6bcf\u4e2a\u5c5e\u6027\u6216\u53c2\u6570\u4ece\u58f0\u660e\u7684\u683c\u5f0f\u8f6c\u6362\u6210\u5b9e\u9645\u7684\u65b9\u6cd5\u53c2\u6570\u7c7b\u578b\uff1b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Spring\u9ed8\u8ba4\u53ef\u4ee5\u5c06String\u8f6c\u6362\u6210\u6240\u6709\u7684\u5185\u7f6e\u7c7b\u578b\uff0c\u4f8b\u5982int, long, String, boolean\u7b49\u3002<\/p>\n\n\n\n
\u5f53\u5bb9\u5668\u88ab\u521b\u5efa\u7684\u65f6\u5019\u4f1a\u9a8c\u8bc1bean\u7684\u914d\u7f6e\u3002bean\u5c5e\u6027\u5728\u521b\u5efa\u524d\u4e0d\u4f1a\u8bbe\u7f6e\u3002<\/p>\n\n\n\n
singleton\u4f5c\u7528\u57df\uff08\u9ed8\u8ba4\uff09\u7684bean\u4f1a\u5728\u5bb9\u5668\u521b\u5efa\u65f6\u88ab\u521b\u5efa\uff0c\u5426\u5219\u53ea\u6709\u5f53bean\u88ab\u8bf7\u6c42\u7684\u65f6\u5019\u624d\u521b\u5efa\u3002<\/p>\n\n\n\n
\u4f9d\u8d56\u548c\u914d\u7f6e\u7ec6\u8282\uff1a<\/em><\/strong><\/p>\n\n\n\n
Spring\u7684xml\u914d\u7f6e\u5143\u6570\u636e\u6587\u4ef6\u7684<property\/><\/code>\u548c<constructor-arg\/<\/code>>\u5143\u7d20\u5b50\u5143\u7d20\u3002<\/p>\n\n\n\n
\u76f4\u63a5\u503c\uff0c\u5982\u539f\u59cb\u7c7b\u578b\u3001String\u7b49<\/strong><\/p>\n\n\n\n
\u901a\u8fc7<property\/>\u5143\u7d20\u7684value\u5c5e\u6027\u8868\u793a\uff1a<\/p>\n\n\n\n
<bean id=\"myDataSource\" class=\"org.apache.commons.dbcp.BasicDataSource\" destroy-method=\"close\">\n    <property name=\"driverClassName\" value=\"com.mysql.jdbc.Driver\"\/>\n    <property name=\"url\" value=\"jdbc:mysql:\/\/localhost:3306\/mydb\"\/>\n    <property name=\"username\" value=\"root\"\/>\n    <property name=\"password\" value=\"misterkaoli\"\/>\n<\/bean><\/code><\/pre>\n\n\n\n
\u6709\u53ef\u4ee5\u5f15\u7528id\u7684idref\u5143\u7d20\uff1a<\/p>\n\n\n\n
<bean id=\"theTargetBean\" class=\"...\"\/>\n\n<bean id=\"theClientBean\" class=\"...\">\n    <property name=\"targetName\">\n        <idref bean=\"theTargetBean\"\/>\n    <\/property>\n<\/bean><\/code><\/pre>\n\n\n\n
\u76f4\u63a5\u5f15\u7528\u522b\u7684bean\u7684ref\u5143\u7d20\uff1a<\/p>\n\n\n\n
<bean id=\"theTargetBean\" class=\"...\"\/>\n\n<bean id=\"theClientBean\" class=\"...\">\n    <property name=\"targetName\">\n        <ref bean=\"theTargetBean\"\/>\n    <\/property>\n<\/bean><\/code><\/pre>\n\n\n\n
\u4f5c\u7528\u57df\u548c\u9a8c\u8bc1\u53d6\u51b3ref\u5143\u7d20\u7684bean<\/code>\u6216parent<\/code>\u5c5e\u6027\u3002<\/p>\n\n\n\n
\u901a\u8fc7parent<\/code>\u5c5e\u6027\u58f0\u660ebean\u662f\u5f15\u7528\u5f53\u524d\u5bb9\u5668\u7684\u7236\u5bb9\u5668\u4e2d\u7684bean\u3002<\/p>\n\n\n\n
The target bean must be in a parent container of the current one.<\/p>\n\n\n\n
\u5185\u90e8bean<\/strong>\uff1a<property\/><\/code>\u6216<constructor-arg\/<\/code>>\u5143\u7d20\u5185\u7684<bean\/><\/code>\u5143\u7d20\uff1a<\/p>\n\n\n\n
<bean id=\"outer\" class=\"...\">\n    <!-- instead of using a reference to a target bean, simply define the target bean inline -->\n    <property name=\"target\">\n        <bean class=\"com.example.Person\">\n            <!-- this is the inner bean -->\n            <property name=\"name\" value=\"Fiona Apple\"\/>\n            <property name=\"age\" value=\"25\"\/>\n        <\/bean>\n    <\/property>\n<\/bean><\/code><\/pre>\n\n\n\n
\u5185\u90e8bean\u4e0d\u9700\u8981id\u6216\u8005name\u6216\u8005scope\u5c5e\u6027\uff0c\u5c31\u7b97\u58f0\u660e\u4e86\u4e5f\u4e0d\u751f\u6548\u3002<\/p>\n\n\n\n
\u4e0d\u5b58\u5728\u72ec\u7acb\u8bbf\u95ee\u5185\u90e8bean\uff0c\u4e5f\u4e0d\u5b58\u5728\u5c06\u5185\u90e8bean\u6ce8\u5165\u522b\u7684\u5408\u4f5cbean\u3002<\/p>\n\n\n\n
\u6ce8\u5165\u96c6\u5408<\/strong>\uff1a<\/p>\n\n\n\n
<list\/><\/code>, <set\/><\/code>, <map\/><\/code>, \u548c<props\/><\/code>\u5143\u7d20\u8bbe\u7f6e\u5bf9\u5e94\u7684Collection\u7c7b\u578b\u7684\u5c5e\u6027\u548c\u53c2\u6570\u3002<\/p>\n\n\n\n
\u4f8b\u5982\uff1a<\/p>\n\n\n\n
<bean id=\"moreComplexObject\" class=\"example.ComplexObject\">\n    <!-- (java.util.Properties)\u7c7b\u578b\u8c03\u7528 -->\n    <property name=\"adminEmails\">\n        <props>\n            <prop key=\"administrator\">administrator@example.org<\/prop>\n            <prop key=\"support\">support@example.org<\/prop>\n            <prop key=\"development\">development@example.org<\/prop>\n        <\/props>\n    <\/property>\n    <!-- (java.util.List)\u7c7b\u578b\u8c03\u7528 -->\n    <property name=\"someList\">\n        <list>\n            <value>a list element followed by a reference<\/value>\n            <ref bean=\"myDataSource\" \/>\n        <\/list>\n    <\/property>\n    <!-- (java.util.Map)\u7c7b\u578b\u8c03\u7528 -->\n    <property name=\"someMap\">\n        <map>\n            <entry key=\"an entry\" value=\"just some string\"\/>\n            <entry key =\"a ref\" value-ref=\"myDataSource\"\/>\n        <\/map>\n    <\/property>\n    <!-- (java.util.Set)\u7c7b\u578b\u8c03\u7528 -->\n    <property name=\"someSet\">\n        <set>\n            <value>just some string<\/value>\n            <ref bean=\"myDataSource\" \/>\n        <\/set>\n    <\/property>\n<\/bean><\/code><\/pre>\n\n\n\n
\u96c6\u5408\u8fc1\u79fb<\/strong><\/p>\n\n\n\n
\u5b9a\u4e49\u4e00\u4e2a\u62bd\u8c61bean\uff0c\u91cc\u9762\u6709\u5df2\u7ecf\u5b9a\u4e49\u7684\u96c6\u5408\uff0c\u53ef\u4ee5\u901a\u8fc7\u7ee7\u627f\u6dfb\u52a0\u6216\u8986\u76d6\u539f\u6709\u7684\u5143\u7d20\uff1a<\/p>\n\n\n\n
<beans>\n    <bean id=\"parent\" abstract=\"true\" class=\"example.ComplexObject\">\n        <property name=\"adminEmails\">\n            <props>\n                <prop key=\"administrator\">administrator@example.com<\/prop>\n                <prop key=\"support\">support@example.com<\/prop>\n            <\/props>\n        <\/property>\n    <\/bean>\n    <bean id=\"child\" parent=\"parent\">\n        <property name=\"adminEmails\">\n            <props merge=\"true\">\n                <prop key=\"sales\">sales@example.com<\/prop>\n                <prop key=\"support\">support@example.co.uk<\/prop>\n            <\/props>\n        <\/property>\n    <\/bean>\n<beans><\/code><\/pre>\n\n\n\n
\u4f7f\u7528<props\/>\u5143\u7d20\u7684merge\u5c5e\u6027\u5373\u53ef\u7ee7\u627f\u96c6\u5408\u3002<\/p>\n\n\n\n
\u4e0a\u9762\u4ee3\u7801\u7247\u6bb5\u4e2dadminEmails\u7684\u5185\u5bb9\u4e3a\uff1a<\/p>\n\n\n\n
administrator=administrator@example.com\nsales=sales@example.com\nsupport=support@example.co.uk<\/code><\/pre>\n\n\n\n
\u96c6\u5408\u8fc1\u79fb\u7684\u9650\u5236\uff1a\u4e0d\u80fd\u8fc1\u79fb\u4e0d\u540c\u7684\u96c6\u5408\u7c7b\u578b\uff0cmerge\u5c5e\u6027\u5fc5\u987b\u8bbe\u7f6e\u5728\u5b50\u5143\u7d20\u3002<\/p>\n\n\n\n
\u5f3a\u7c7b\u578b\u96c6\u5408\uff1a\u53ef\u4ee5\u58f0\u660e\u96c6\u5408\u91cc\u7684\u5bf9\u8c61\u7c7b\u578b\uff1a<\/p>\n\n\n\n
public class SomeClass {\n\n    private Map<String, Float> accounts;\n\n    public void setAccounts(Map<String, Float> accounts) {\n        this.accounts = accounts;\n    }\n}<\/code><\/pre>\n\n\n\n
<beans>\n    <bean id=\"something\" class=\"x.y.SomeClass\">\n        <property name=\"accounts\">\n            <map>\n                <entry key=\"one\" value=\"9.99\"\/>\n                <entry key=\"two\" value=\"2.75\"\/>\n                <entry key=\"six\" value=\"3.99\"\/>\n            <\/map>\n        <\/property>\n    <\/bean>\n<\/beans><\/code><\/pre>\n\n\n\n
Spring\u901a\u8fc7\u53cd\u5c04\u5f97\u77e5accounts\u5bf9\u8c61\u7684\u5143\u7d20\u7c7b\u578b\u4fe1\u606f\uff0c\u5c31\u4f1a\u5c06string\u503c(9.99, 2.75<\/code>, and 3.99<\/code>)\u8f6c\u6362\u6210Float\u7c7b\u578b\u800c\u4e0d\u662fDouble\u3002<\/p>\n\n\n\n
null\u548c\u7a7aString\u503c\uff1aSpring\u5c06\u7a7a\u7684\u53c2\u6570\u6216\u4e0e\u4e4b\u7c7b\u4f3c\u7684\u5f53\u4f5c\u7a7aString\uff1a<\/p>\n\n\n\n
<bean class=\"ExampleBean\">\n    <property name=\"email\" value=\"\"\/>\n<\/bean><\/code><\/pre>\n\n\n\n
\u7b49\u4ef7\u4e8e\uff1a<\/p>\n\n\n\n
exampleBean.setEmail(\"\");<\/code><\/pre>\n\n\n\n
\u800c<null\/><\/code>\u5143\u7d20\u7528\u4e8e\u5904\u7406null\uff1a<\/p>\n\n\n\n
<bean class=\"ExampleBean\">\n    <property name=\"email\">\n        <null\/>\n    <\/property>\n<\/bean><\/code><\/pre>\n\n\n\n
\u7b49\u4ef7\u4e8e\uff1a<\/p>\n\n\n\n
exampleBean.setEmail(null);<\/code><\/pre>\n\n\n\n
\u5d4c\u5957\u5c5e\u6027\u540d\uff1a<\/p>\n\n\n\n
<bean id=\"something\" class=\"things.ThingOne\">\n    <property name=\"fred.bob.sammy\" value=\"123\" \/>\n<\/bean><\/code><\/pre>\n\n\n\n
\u610f\u601d\u662f\uff1asomething\u8fd9\u4e2abean\u6709\u4e2afred\u5c5e\u6027\uff0cfred\u6709bob\uff0cbob\u6709sammy\uff0c\u5c06sammy\u7684\u503c\u8bbe\u7f6e\u6210123\u3002<\/p>\n\n\n\n
\u4e3a\u4e86\u80fd\u591f\u6b63\u5e38\u5de5\u4f5c\uff0cfred\u548cbob\u4e0d\u80fd\u4e3anull\uff0c\u5426\u5219\u62a5\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/p>\n\n\n\n
depends-on<\/code>\u5c5e\u6027<\/strong>\uff1a\u5f3a\u52361\u4e2a\u6216\u591a\u4e2abean\u5728\u8bbe\u7f6e\u6b64\u5c5e\u6027\u7684bean\u4e4b\u524d\u521d\u59cb\u5316\uff1a<\/p>\n\n\n\n
<bean id=\"beanOne\" class=\"ExampleBean\" depends-on=\"manager\"\/>\n<bean id=\"manager\" class=\"ManagerBean\" \/><\/code><\/pre>\n\n\n\n
ManagerBean\u5728ExampleBean\u4e4b\u524d\u521d\u59cb\u5316\u3002<\/p>\n\n\n\n
lazy-init\u5c5e\u6027\uff1a\u5728\u7b2c\u4e00\u6b21\u8bf7\u6c42bean\u7684\u65f6\u5019\u521b\u5efabean\u800c\u4e0d\u662f\u5728\u5bb9\u5668\u521b\u5efa\u65f6\uff1a<\/p>\n\n\n\n
<bean id=\"lazy\" class=\"com.something.ExpensiveToCreateBean\" lazy-init=\"true\"\/>\n<bean name=\"not.lazy\" class=\"com.something.AnotherBean\"\/><\/code><\/pre>\n\n\n\n
\u5f53lazy-initialized bean\u4f5c\u4e3a\u522b\u7684sintelon\u4f5c\u7528\u57dfbean\u7684\u4f9d\u8d56\u65f6\u5ffd\u7565lazy-init\u5c5e\u6027\u3002<\/p>\n\n\n\n
\u53ef\u4ee5\u8bbe\u7f6e\u5bb9\u5668\u7ea7\u522b\u7684lazy-init\uff0c<beans\/>\u5143\u7d20\u7684default-lazy-init\u5c5e\u6027\uff1a<\/p>\n\n\n\n
<beans default-lazy-init=\"true\">\n    <!-- \u6ca1\u6709bean\u4f1a\u5728\u5bb9\u5668\u521b\u5efa\u65f6\u521d\u59cb\u5316 -->\n<\/beans><\/code><\/pre>\n\n\n\n
Autowiring(\u81ea\u52a8\u88c5\u914d)\u4e00\u8d77\u534f\u4f5c\u7684bean<\/strong><\/p>\n\n\n\n
Spring\u5bb9\u5668\u53ef\u4ee5\u81ea\u52a8\u88c5\u914d\u4e92\u76f8\u534f\u4f5c\u7684bean\uff0c\u901a\u8fc7\u68c0\u67e5ApplicationContext\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n
Autowiring\u7684\u4f18\u52bf\uff1a<\/p>\n\n\n\n
\u663e\u8457\u51cf\u5c11\u9700\u8981\u58f0\u660e\u7684\u5c5e\u6027\u6216\u8005\u6784\u9020\u5668\u53c2\u6570\uff1b<\/td><\/tr>
\u53ef\u4ee5\u6309\u9700\u8981\u66f4\u65b0\u914d\u7f6e\u4fe1\u606f\uff1b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u5f53\u4f7f\u7528xml\u914d\u7f6e\u5143\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7<bean\/><\/code>\u5143\u7d20\u7684autowire\u5c5e\u6027\u58f0\u660e\u81ea\u52a8\u88c5\u914d\u6a21\u5f0f\uff1a<\/p>\n\n\n\n
no<\/td>\u9ed8\u8ba4\u503c\uff0c\u4e0d\u8fdb\u884c\u81ea\u52a8\u88c5\u914d\u3002\u5f15\u7528bean\u5fc5\u987b\u4f7f\u7528ref\u5c5e\u6027\uff1b<\/td><\/tr>
byName<\/td>\u901a\u8fc7\u53d8\u91cf\u540d\u8bbe\u7f6e\u5c5e\u6027\uff0c\u901a\u8fc7setter\u65b9\u6cd5\u8fbe\u6210\uff1b<\/td><\/tr>
byType<\/td>\u901a\u8fc7\u53d8\u91cf\u7684\u7c7b\u578b\u5224\u65ad\uff0c\u53ea\u80fd\u5b58\u5728\u4e00\u4e2a\u540c\u7c7b\u578bbean\uff0c\u5426\u5219\u62a5\u81f4\u547d\u9519\u8bef\u3002
\u5982\u679c\u6ca1\u6709\u5339\u914d\u5c31\u4ec0\u4e48\u90fd\u4e0d\u4f1a\u53d1\u751f\uff1b<\/td><\/tr>
constructor<\/td>\u7c7b\u4f3c\u4e8ebyType\uff0c\u4f46\u662f\u7528\u4e8e\u6784\u9020\u5668\u53c2\u6570\u3002\u5982\u679c\u6ca1\u6709\u5339\u914d\u5c31\u62a5\u81f4\u547d\u9519\u8bef\uff1b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u5728byType<\/code>\u6216constructor<\/code>\u6a21\u5f0f\uff0c\u53ef\u4ee5\u88c5\u914d\u6570\u7ec4\u6216\u8005\u58f0\u660e\u7c7b\u578b\u4fe1\u606f\u7684\u5217\u8868\u3001\u5f3a\u7c7b\u578bMap\uff0c\u5bf9\u4e8eMap\u7c7b\u578b\uff0ckey\u5c31\u662fbean\u7684\u540d\u5b57\u3002<\/p>\n\n\n\n
Autowiring\u7684\u9650\u5236\u548c\u7f3a\u70b9\uff1a<\/strong><\/p>\n\n\n\n
\u660e\u786e\u7684property<\/code>\u548cconstructor-arg<\/code>\u8bbe\u7f6e\u603b\u4f1a\u8986\u76d6autowiring\u3002
\u800c\u4e14\u4e0d\u53ef\u4ee5\u88c5\u914d\u7b80\u5355\u7684\u53d8\u91cf\u7c7b\u578b\uff0c\u5982\u539f\u59cb\u7c7b\u578b, Strings<\/code>,\u548c\u7c7b\uff0c\u4ee5\u53ca\u5b83\u4eec\u7684\u6570\u7ec4\uff0c\u8fd9\u662f\u8bbe\u8ba1\u539f\u56e0\uff1b<\/td><\/tr>
\u4e0d\u5982\u76f4\u63a5\u88c5\u914d\u660e\u786e\u3002Spring\u7ba1\u7406\u7684\u5bf9\u8c61\u4e4b\u95f4\u7684\u5173\u7cfb\u6ca1\u6709\u660e\u786e\u7684\u8bf4\u660e\u6587\u6863\uff1b<\/td><\/tr>
\u88c5\u914d\u4fe1\u606f\u5bf9\u4e8e\u751f\u6210\u6587\u6863\u7684\u5de5\u5177\u53ef\u80fd\u662f\u4e0d\u53ef\u7528\u7684\uff1b\uff08\u50cfswagger2\u4e4b\u7c7b\u7684\uff09<\/td><\/tr>
\u5728\u4e00\u4e2a\u5bb9\u5668\u91cc\u7684\u591a\u4e2abean\u5b9a\u4e49\u53ef\u80fd\u4f1a\u5339\u914d\u540c\u4e00\u4e2a\u65b9\u6cd5\u7684\u53c2\u6570\uff0c\u5bf9\u4e8e\u5217\u8868\u7c7b\u578b\u4e0d\u662f\u95ee\u9898\uff0c\u4f46\u662f\u5bf9\u4e8e\u53ea\u8981\u4e00\u4e2a\u503c\u7684\u5bf9\u8c61\u4f1a\u9020\u6210\u4e8c\u4e49\u6027\uff0c\u4e4b\u540e\u5c31\u4f1a\u629b\u51fa\u5f02\u5e38\uff1b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u5f53\u7136\uff0c\u540c\u6837\u4e5f\u6709\u51e0\u4e2a\u89e3\u51b3\u65b9\u6848\uff1a<\/p>\n\n\n\n
\u653e\u5f03\u81ea\u52a8\u88c5\u914d\uff0c\u8f6c\u4e3a\u4f7f\u7528\u660e\u786e\u88c5\u914d\uff1b<\/td><\/tr>
\u5c06\u4e0d\u60f3\u88ab\u88c5\u914d\u7684bean\u7684autowire-candidate\u5c5e\u6027\u8bbe\u7f6e\u6210false\uff1b<\/td><\/tr>
\u9009\u4e00\u4e2a\u9996\u9009bean\uff0c\u5c06\u5176primary\u5c5e\u6027\u8bbe\u7f6e\u6210true\uff1b<\/td><\/tr>
\u4f7f\u7528\u53ef\u4ee5\u66f4\u7cbe\u7ec6\u63a7\u5236\u7684\u6ce8\u89e3\u5f0f\u914d\u7f6e\uff1b<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u4ece\u81ea\u52a8\u88c5\u914d\u5019\u9009\u4e2d\u6392\u9664\u4e00\u4e2abean\uff1a<\/strong><\/p>\n\n\n\n
\u5728xml\u914d\u7f6e\u5143\u6570\u636e\u4e2d\uff0c\u5c06<bean\/><\/code>\u5143\u7d20\u7684autowire-candidate\u5c5e\u6027\u8bbe\u7f6e\u6210false\u3002<\/p>\n\n\n\n
\u6ce8\u610f\uff1aautowire-candidate\u5c5e\u6027\u8bbe\u8ba1\u6210\u53ea\u5f71\u54cd\u57fa\u4e8e\u7c7b\u578b\u7684\u88c5\u914d\uff0c\u4e0d\u5f71\u54cd\u660e\u786e\u7684\u57fa\u4e8e\u547d\u540d\u7684\u88c5\u914d\u3002<\/p>\n\n\n\n
\u4e5f\u53ef\u4ee5\u5728<beans\/><\/code>\u5143\u7d20\u5185\u8bbe\u7f6edefault-autowire-candidates\u5c5e\u6027\u9650\u5236\u81ea\u52a8\u88c5\u914d\u5019\u9009\uff0c\u5b83\u63a5\u53d7\u4e00\u4e2a\u6216\u591a\u4e2a\u7684\u5339\u914d\u89c4\u5219\u3002\u5bf9\u4e8e\u8bbe\u7f6e\u4e86autowire-candidate\u5c5e\u6027\u7684bean\u65e0\u6548\u3002<\/p>\n\n\n\n
\u6ce8\u610f\uff1a\u662f\u9632\u6b62\u81ea\u52a8\u88c5\u914d\u5230\u522b\u7684bean\uff0c\u800c\u4e0d\u662f\u7981\u6b62\u8fd9\u4e2abean\u88ab\u88c5\u914d\uff0c\u5305\u62ec\u5b83\u81ea\u5df1\u3002<\/p>\n\n\n\n
\u65b9\u6cd5\u5f0f\u6ce8\u5165\uff1a<\/strong><\/p>\n\n\n\n
\u4e0d\u540c\u4f5c\u7528\u57df\u7684bean\u76f8\u4e92\u4f9d\u8d56\u7684\u95ee\u9898\uff0c\u53ef\u4ee5\u8ba9\u4e00\u4e2abean\u5b9e\u73b0ApplicationContextAware\u63a5\u53e3\uff0c\u5f53\u5b83\u9700\u8981\u67d0\u4e2abean\u7684\u65f6\u5019\u5c31\u4ece\u5bb9\u5668\u8c03\u7528getBean\u65b9\u6cd5<\/strong>\u83b7\u5f97\u9700\u8981\u7684bean\u3002\u4f46\u662f\u8fd9\u6837\u548cspring\u6846\u67b6\u8026\u5408\u5ea6\u4f1a\u53d8\u9ad8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Spring\u6846\u67b6\u4f9d\u8d56\u5904\u7406\u7ec6\u8282<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[28],"class_list":["post-524","post","type-post","status-publish","format-standard","hentry","category-ioc","tag-ioc"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"_links":{"self":[{"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/posts\/524","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=524"}],"version-history":[{"count":2,"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/posts\/524\/revisions"}],"predecessor-version":[{"id":526,"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/posts\/524\/revisions\/526"}],"wp:attachment":[{"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=524"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=524"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=524"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}