{"id":662,"date":"2022-09-27T10:43:21","date_gmt":"2022-09-27T02:43:21","guid":{"rendered":"https:\/\/22pig.com\/?p=662"},"modified":"2022-09-27T10:43:21","modified_gmt":"2022-09-27T02:43:21","slug":"springboot-%e5%8d%95%e4%be%8b%e4%b8%ad%e4%bd%bf%e7%94%a8autowired","status":"publish","type":"post","link":"http:\/\/22pig.com\/?p=662","title":{"rendered":"SpringBoot-\u5355\u4f8b\u4e2d\u4f7f\u7528AutoWired"},"content":{"rendered":"<div>\u5bf9\u4e8e\u4e00\u4e2a\u5355\u4f8b\u7c7b\u6309\u7167\u5e73\u65f6\u7684\u6ce8\u89e3\u65b9\u5f0f\u6dfb\u52a0\uff0c\u542f\u52a8\u65f6\u4f1a\u62a5\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u56e0\u4e3astatic\u7c7b\u5bf9\u8c61\u662f\u521b\u5efa\u5bf9\u8c61\u540e\uff0c\u5185\u5b58\u4e2d\u8fd8\u6ca1\u6709\u6ce8\u5165Bean\u4fe1\u606f\uff0c\u4e14\u65e0\u6cd5\u521d\u59cb\u5316Bean\u5b9e\u4f8b\uff0c\u8fd9\u91cc\u7684\u89e3\u51b3\u529e\u6cd5\u662f\u5229\u7528@PostConstruct\u6765\u5bf9\u5355\u4f8b\u7c7b\u4e2d\u5bf9\u8c61\u7684\u6ce8\u5165\u3002<\/div>\n<div><\/div>\n<div class=\"line number1 index0 alt2\"><code class=\"java color1\">@Component<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java keyword\">public<\/code>\u00a0<code class=\"java keyword\">class<\/code>\u00a0<code class=\"java plain\">DBManager {<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">private<\/code>\u00a0<code class=\"java keyword\">static<\/code>\u00a0<code class=\"java plain\">DBManager instance =\u00a0<\/code><code class=\"java keyword\">new<\/code>\u00a0<code class=\"java plain\">DBManager();<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java color1\">@Autowired<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">public<\/code>\u00a0<code class=\"java plain\">UserServiceImpl userService;<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">private<\/code>\u00a0<code class=\"java plain\">DBManager() {<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">public<\/code>\u00a0<code class=\"java keyword\">static<\/code>\u00a0<code class=\"java plain\">DBManager getInstance() {<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java 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alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">instance.userService =\u00a0<\/code><code class=\"java keyword\">this<\/code><code class=\"java plain\">.userService;<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"java plain\">}<\/code><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5bf9\u4e8e\u4e00\u4e2a\u5355\u4f8b\u7c7b\u6309\u7167\u5e73\u65f6\u7684\u6ce8\u89e3\u65b9\u5f0f\u6dfb\u52a0\uff0c\u542f\u52a8\u65f6\u4f1a\u62a5\u7a7a\u6307\u9488\u5f02\u5e38\uff0c\u56e0\u4e3astatic\u7c7b\u5bf9\u8c61\u662f\u521b\u5efa\u5bf9\u8c61\u540e\uff0c\u5185\u5b58\u4e2d\u8fd8\u6ca1\u6709\u6ce8\u5165Bean\u4fe1\u606f\uff0c\u4e14\u65e0\u6cd5\u521d\u59cb\u5316Bean\u5b9e\u4f8b\uff0c\u8fd9\u91cc\u7684\u89e3\u51b3\u529e\u6cd5\u662f\u5229\u7528@PostConstruct\u6765\u5bf9\u5355\u4f8b\u7c7b\u4e2d\u5bf9\u8c61\u7684\u6ce8\u5165\u3002 @Component public\u00a0class\u00a0DBManager { \u00a0\u00a0\u00a0\u00a0private\u00a0static\u00a0DBManager instance =\u00a0new\u00a0DBManager(); \u00a0\u00a0\u00a0\u00a0@Autowired \u00a0\u00a0\u00a0\u00a0public\u00a0UserServiceImpl userService; \u00a0\u00a0\u00a0\u00a0private\u00a0DBManager() { \u00a0\u00a0\u00a0\u00a0} \u00a0\u00a0\u00a0\u00a0public\u00a0static\u00a0DBManager getInstance() { \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0instance; \u00a0\u00a0\u00a0\u00a0} \u00a0\u00a0\u00a0\u00a0@PostConstruct \u00a0\u00a0\u00a0\u00a0public\u00a0void\u00a0init() { \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0instance =\u00a0this; \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0instance.userService =\u00a0this.userService; \u00a0\u00a0\u00a0\u00a0} 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