{"id":186,"date":"2021-04-16T01:04:56","date_gmt":"2021-04-15T17:04:56","guid":{"rendered":"https:\/\/explause.com\/?p=186"},"modified":"2022-07-03T00:06:23","modified_gmt":"2022-07-02T16:06:23","slug":"spring%e4%be%9d%e8%b5%96%e6%b3%a8%e5%85%a5","status":"publish","type":"post","link":"https:\/\/devdoge.org\/?p=186","title":{"rendered":"Spring\u4f9d\u8d56\u6ce8\u5165"},"content":{"rendered":"\n

\u4f9d\u8d56\u6ce8\u5165\uff08Dependency Injection\uff09\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u5c06\u4e00\u4e2a\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570<\/strong>\u8f93\u5165\u7ed9\u53e6\u4e00\u4e2a\u7c7b\uff0c\u8ba9\u5b83\u4eec\u534f\u540c\u5de5\u4f5c\u3002<\/p>\n\n\n\n

\u6709\u4e24\u79cd\u65b9\u6cd5\u6ce8\u5165\uff1a\u901a\u8fc7\u7c7b\u7684\u6784\u9020\u51fd\u6570<\/strong>\u6216\u8005setter\u65b9\u6cd5<\/strong>\u6ce8\u5165\u3002
\u4e24\u79cd\u65b9\u6cd5\u5404\u6709\u5404\u7684\u597d\u5904\uff0c\u4e5f\u53ef\u4ee5\u6df7\u7528\u3002\u53ef\u4ee5\u901a\u8fc7\u6784\u9020\u51fd\u6570\u6ce8\u5165\u786e\u4fdd\u53c2\u6570\u4e00\u5b9a\u4f1a\u88ab\u6ce8\u5165\uff0c\u5426\u5219\u5c31\u4f1a\u5931\u8d25\uff0csetter\u65b9\u6cd5\u53ef\u7528\u4e8e\u53ef\u9009\u7684\u4f9d\u8d56\u3002Spring\u56e2\u961f\u62e5\u62a4\u6784\u9020\u51fd\u6570\u6ce8\u5165\uff0c\u56e0\u4e3a\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u8c61\u4e0d\u53ef\u53d8\u548c\u786e\u4fdd\u4f9d\u8d56\u4e0d\u4f1a\u662fnull\u3002\u800c\u4e14\u6784\u9020\u51fd\u6570\u8fd4\u56de\u540e\u5bf9\u8c61\u6c38\u8fdc\u5904\u4e8e\u5b8c\u5168\u521d\u59cb\u5316\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n

\u901a\u8fc7\u6784\u9020\u51fd\u6570<\/strong><\/p>\n\n\n\n

Beans.xml\u6587\u4ef6\u91ccbean\u7684constructor-arg\u5b50\u6807\u7b7e\u3002 \u5b83\u672c\u8eab\u6709name\u3001index\u3001type\u548cref\u3001value\u5c5e\u6027\uff0c\u5206\u522b\u610f\u5473\u7740\u6309\u540d\u79f0\u3001\u76ee\u5f55\u987a\u5e8f\u548c\u7c7b\u578b\u533a\u5206\u6784\u9020\u51fd\u6570\u7684\u53c2\u6570\uff0cref\u662f\u5f15\u7528\u522b\u7684bean\u3002<\/em><\/strong><\/p>\n\n\n\n

\u6784\u9020\u51fd\u6570\u53c2\u6570\u89e3\u6790\uff1aBean\u7684\u6784\u9020\u51fd\u6570\u53c2\u6570\u987a\u5e8f\u5c31\u662fxml\u6587\u4ef6\u91cc\u9762constructor-arg\u5b50\u5143\u7d20\u7684\u987a\u5e8f\u3002
\u4e5f\u53ef\u4ee5\u901a\u8fc7\u53c2\u6570\u7c7b\u578b\u533a\u5206\uff0cconstructor-arg\u5b50\u5143\u7d20\u7684type\u5c5e\u6027\u6307\u5b9a\u7c7b\u578b\uff0cvalue\u6307\u5b9a\u53c2\u6570\u503c\u3002
\u8fd8\u53ef\u4ee5\u901a\u8fc7index\u5c5e\u6027\u6307\u5b9a\u53c2\u6570\u4f4d\u7f6e\uff0c\u4ece0\u5f00\u59cb\u3002<\/p>\n\n\n\n

\u4f8b\u5b50\uff1a\u5148\u521b\u5efa\u4e00\u4e2a\u9879\u76ee<\/a>\u6216\u8005\u4e0b\u8f7d\u6211\u505a\u597d\u7684\u793a\u4f8b<\/a><\/p>\n\n\n\n

HelloWorld.java\u6587\u4ef6\uff1a<\/strong><\/p>\n\n\n\n

package com.explause.DenpendencyInjectionExamples;\n\npublic class HelloWorld {\n\tprivate String message;\n\tprivate HelloWorld2 helloWorld2;\n\t\n\tpublic void setMessage(String message){\n\t\tthis.message  = message;\n\t}\n\tpublic void setHelloWorld2(HelloWorld2 helloWorld2) {\n\t\tthis.helloWorld2 = helloWorld2;\n\t}\n\tpublic void getMessage() {\n\t\tSystem.out.println(\"Your Message : \" + message);\n\t\thelloWorld2.getMessage();\n\t}\n\t\n\tpublic HelloWorld(HelloWorld2 helloWorld2) {\n\t\tSystem.out.println(\"Inside HelloWorld constructor\");\n\t\tthis.helloWorld2 = helloWorld2;\n\t}\n}<\/code><\/pre>\n\n\n\n
HelloWorld2.java\u6587\u4ef6\uff1a<\/strong><\/p>\n\n\n\n
package com.explause.DenpendencyInjectionExamples;\n\npublic class HelloWorld2 {\n\tprivate String message;\n\tprivate String message2;\n\t\n\tpublic void setMessage(String message){\n\t\tthis.message  = message;\n\t}\n\tpublic void getMessage(){\n\t\tSystem.out.println(\"Your Message : \" + message);\n\t\tSystem.out.println(\"Your Message 2 : \" + message2);\n\t}\n\tpublic void setMessage2(String message2){\n\t\tthis.message2  = message2;\n\t}\n}<\/code><\/pre>\n\n\n\n
DependencyInjectionDemo.java\u6587\u4ef6\uff1a<\/strong><\/p>\n\n\n\n
package com.explause.DenpendencyInjectionExamples;\n\nimport org.springframework.context.support.ClassPathXmlApplicationContext;\n\npublic class DependencyInjectionDemo {\n\tpublic static void main(String[] args) {\n\t\tClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(\"Beans.xml\");\n\t\tHelloWorld obj1 = (HelloWorld) context.getBean(\"helloWorld\");\n\t\tobj1.getMessage();\n\t\tcontext.close();\n\t}\n}<\/code><\/pre>\n\n\n\n
Beans.xml\u6587\u4ef6\uff0c\u901a\u8fc7constructor-arg\u6807\u7b7e\u7684index\u5c5e\u6027\u6ce8\u5165\uff1a<\/strong><\/p>\n\n\n\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<beans xmlns = \"http:\/\/www.springframework.org\/schema\/beans\"\n   xmlns:xsi = \"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\n   xsi:schemaLocation = \"http:\/\/www.springframework.org\/schema\/beans\n   http:\/\/www.springframework.org\/schema\/beans\/spring-beans-3.0.xsd\">\n\n\t<bean id='helloWorld' class='com.explause.DenpendencyInjectionExamples.HelloWorld'>\n\t\t<property name=\"message\" value='Hello World'\/> <!-->\u5355\u5f15\u53f7\u53cc\u5f15\u53f7\u6ca1\u6709\u5f71\u54cd<-->\n\t\t<constructor-arg index='0' ref=\"helloWorld2\"\/> <!-->\u8fd9\u884c\u662f\u4f7f\u7528\u6784\u9020\u51fd\u6570\u6309\u76ee\u5f55\u987a\u5e8f\u6ce8\u5165<-->\n\t<\/bean>\n\t\n\t<bean id='helloWorld2' class='com.explause.DenpendencyInjectionExamples.HelloWorld2'>\n\t\t<property name=\"message\" value='Hello World'\/>\n\t\t<property name=\"message2\" value='Hello World 2'\/>\n\t<\/bean>\n<\/beans><\/code><\/pre>\n\n\n\n
\u6216\u8005\u901a\u8fc7constructor-arg\u6807\u7b7e\u7684type\u5c5e\u6027\u6ce8\u5165\uff1a<\/strong><\/p>\n\n\n\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<beans xmlns = \"http:\/\/www.springframework.org\/schema\/beans\"\n   xmlns:xsi = \"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\n   xsi:schemaLocation = \"http:\/\/www.springframework.org\/schema\/beans\n   http:\/\/www.springframework.org\/schema\/beans\/spring-beans-3.0.xsd\">\n\n\t<bean id='helloWorld' class='com.explause.DenpendencyInjectionExamples.HelloWorld'>\n\t\t<property name=\"message\" value='Hello World'\/> <!-->\u5355\u5f15\u53f7\u53cc\u5f15\u53f7\u6ca1\u6709\u5f71\u54cd<-->\n\t\t<!-->\u4e0b\u9762\u8fd9\u884c\u662f\u4f7f\u7528\u6784\u9020\u51fd\u6570\u6309\u7c7b\u578b\u6ce8\u5165<-->\n\t\t<constructor-arg type='com.explause.DenpendencyInjectionExamples.HelloWorld2' ref=\"helloWorld2\"\/>\n\t<\/bean>\n\t\n\t<bean id='helloWorld2' class='com.explause.DenpendencyInjectionExamples.HelloWorld2'>\n\t\t<property name=\"message\" value='Hello World'\/>\n\t\t<property name=\"message2\" value='Hello World 2'\/>\n\t<\/bean>\n<\/beans><\/code><\/pre>\n\n\n\n
\u6267\u884cmain\u65b9\u6cd5\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n
\"\"
\u5982\u679cconstructor-arg\u6807\u7b7e\u53ea\u6709value\u6216\u8005ref\u5c06\u4f1a\u8fdb\u884c\u6309\u7c7b\u578b\u5339\u914d\u53c2\u6570\u3002<\/figcaption><\/figure>\n\n\n\n
\u57fa\u4e8esetter\u65b9\u6cd5<\/strong><\/p>\n\n\n\n
\u5176\u5b9e\u5c31\u662fxml\u6587\u4ef6\u91ccbean\u6807\u7b7e\u7684property\u5b50\u6807\u7b7e\u3002\u6709name\u3001ref\u548cvalue\u5c5e\u6027\u3002
ref\u662f\u5f15\u7528\u522b\u7684bean\u3002<\/em><\/strong><\/p>\n\n\n\n
\u901a\u8fc7property\u6807\u7b7e\u7684name\u5c5e\u6027\uff1a\u7c7b\u6587\u4ef6\u5185\u7684\u53d8\u91cf\uff08\u5b57\u6bb5\uff09\u540d\u5b57\u3002setter\u65b9\u6cd5\u7684\u547d\u540d\u5fc5\u987b\u9075\u5b88\u5c0f\u9a7c\u5cf0\u547d\u540d\u6cd5\uff0c\u5373set\u5c0f\u5199\uff0c\u540e\u9762\u7684\u540d\u5b57\u9996\u5b57\u6bcd\u5927\u5199\uff0c\u5c31\u50cfsetMessage()\u4e00\u6837\uff0c\u5426\u5219\u6846\u67b6\u4f1a\u8ba4\u4e0d\u51fa\u6765\u3002<\/p>\n\n\n\n
\u57fa\u4e8esetter\u53ef\u4ee5\u6ce8\u5165\u5185\u5c42bean\uff1a<\/strong>\u53ea\u8981\u7a0d\u5fae\u4fee\u6539\u4e00\u4e0bBeans.xml\u6587\u4ef6\uff1a<\/p>\n\n\n\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<beans xmlns=\"http:\/\/www.springframework.org\/schema\/beans\"\n\txmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\n\txsi:schemaLocation=\"http:\/\/www.springframework.org\/schema\/beans\n   http:\/\/www.springframework.org\/schema\/beans\/spring-beans-3.0.xsd\">\n\n\t<bean id='helloWorld'\n\t\tclass='com.explause.DenpendencyInjectionExamples.HelloWorld'>\n\t\t<property name=\"message\" value='Hello World' \/> <!-->\u5355\u5f15\u53f7\u53cc\u5f15\u53f7\u6ca1\u6709\u5f71\u54cd< -->\n\t\t<property name=\"helloWorld2\">\n\t\t\t<bean id='helloWorld2' class='com.explause.DenpendencyInjectionExamples.HelloWorld2'>\n\t\t\t\t<property name=\"message\" value='Hello World' \/>\n\t\t\t\t<property name=\"message2\" value='Hello World 2' \/>\n\t\t\t<\/bean>\n\t\t<\/property>\n\t<\/bean>\n<\/beans><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
Spring\u7684\u6838\u5fc3\u6280\u672f\u4e4b\u4e00\uff1a\u4f9d\u8d56\u6ce8\u5165\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[18],"class_list":["post-186","post","type-post","status-publish","format-standard","hentry","category-spring","tag-spring"],"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\/186","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=186"}],"version-history":[{"count":18,"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/posts\/186\/revisions"}],"predecessor-version":[{"id":787,"href":"https:\/\/devdoge.org\/index.php?rest_route=\/wp\/v2\/posts\/186\/revisions\/787"}],"wp:attachment":[{"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devdoge.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}