{"id":77,"date":"2026-06-02T09:27:20","date_gmt":"2026-06-02T01:27:20","guid":{"rendered":"https:\/\/mitongxue.cn\/?p=77"},"modified":"2026-06-02T09:29:03","modified_gmt":"2026-06-02T01:29:03","slug":"springboot-%e5%90%af%e5%8a%a8%e6%8a%a5%e9%94%99%e7%9b%b8%e5%85%b3","status":"publish","type":"post","link":"https:\/\/mitongxue.cn\/index.php\/2026\/06\/02\/springboot-%e5%90%af%e5%8a%a8%e6%8a%a5%e9%94%99%e7%9b%b8%e5%85%b3\/","title":{"rendered":"SpringBoot \u542f\u52a8\u62a5\u9519\u76f8\u5173"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u3001\u9ad8\u9891\u6392\u67e5\u987a\u5e8f\uff08\u4ece\u6613\u5230\u96be\uff09<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. MySQL \u670d\u52a1\u662f\u5426\u542f\u52a8<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Windows\uff1a\u670d\u52a1\u91cc\u67e5\u770b <code>MySQL80\/MySQL<\/code> \u662f\u5426\u6b63\u5728\u8fd0\u884c<\/li>\n\n\n\n<li>Linux\uff1a<code>systemctl status mysqld<\/code> \/ <code>service mysql status<\/code>\uff0c\u6ca1\u542f\u52a8\u5219 <code>start<\/code><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u8fde\u63a5\u5730\u5740\u3001\u7aef\u53e3\u5199\u9519\uff08\u6700\u5e38\u89c1\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">properties<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \u9519\u8bef\u793a\u4f8b\nurl=jdbc:mysql:\/\/127.0.0.1:3307\/dbname\n# \u9ed8\u8ba4\u7aef\u53e33306\uff0c\u81ea\u5b9a\u4e49\u624d\u6539\u7aef\u53e3\nurl=jdbc:mysql:\/\/127.0.0.1:3306\/dbname?useSSL=false&amp;serverTimezone=Asia\/Shanghai\n<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fdc\u7a0b\u8fde\u63a5\uff1a\u4e0d\u80fd\u5199<code>localhost\/127.0.0.1<\/code>\uff0c\u6539\u7528 MySQL \u670d\u52a1\u5668\u516c\u7f51 IP<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u9632\u706b\u5899 \/ \u5b89\u5168\u7ec4\u62e6\u622a\u7aef\u53e3 3306<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u672c\u673a\u8fde\u672c\u5730\uff1a\u5173\u95ed\u7535\u8111\u9632\u706b\u5899\u6d4b\u8bd5<\/li>\n\n\n\n<li>\u4e91\u670d\u52a1\u5668 (\u963f\u91cc\u4e91 \/ \u534e\u4e3a\u4e91)\uff1a<strong>\u5b89\u5168\u7ec4\u653e\u884c\u5165\u65b9\u5411 3306 \u7aef\u53e3<\/strong><\/li>\n\n\n\n<li>Linux \u9632\u706b\u5899\uff1a<code>firewall-cmd --add-port=3306\/tcp --permanent &amp;&amp; firewall-cmd --reload<\/code><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. MySQL \u4e0d\u5141\u8bb8\u8fdc\u7a0b\u8bbf\u95ee\uff08\u8fdc\u7a0b\u8fde\u63a5\u5fc5\u67e5\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u767b\u5f55 MySQL \u6267\u884c\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">sql<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-- \u67e5\u770b\u7528\u6237\u8bbf\u95ee\u6743\u9650\nselect host,user from mysql.user;\n-- % \u4ee3\u8868\u5141\u8bb8\u4efb\u610fIP\u8bbf\u95ee\uff0clocalhost\u53ea\u80fd\u672c\u673a\nupdate mysql.user set host='%' where user='root';\nflush privileges;\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">5. \u65f6\u533a &amp; \u9a71\u52a8\u53c2\u6570\u7f3a\u5931\uff08cj \u5305\u5fc5\u5907\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>com.mysql.cj<\/code> \u65b0\u7248\u9a71\u52a8\u5fc5\u987b\u52a0\u53c2\u6570\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">plaintext<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>?serverTimezone=Asia\/Shanghai&amp;useSSL=false&amp;allowPublicKeyRetrieval=true\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f3a\u5c11 <code>serverTimezone<\/code> \u4e5f\u4f1a\u5076\u53d1\u901a\u4fe1\u5931\u8d25\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6. MySQL \u7ed1\u5b9a IP \u9650\u5236\uff08bind-address\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6253\u5f00<code>my.cnf\/my.ini<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ini<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \u53ea\u5141\u8bb8\u672c\u673a\nbind-address=127.0.0.1\n# \u4fee\u6539\u4e3a\u5141\u8bb8\u6240\u6709IP\nbind-address=0.0.0.0\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6539\u5b8c\u91cd\u542f MySQL\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>com.mysql.cj.jdbc.excepti..<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,14],"tags":[],"class_list":["post-77","post","type-post","status-publish","format-standard","hentry","category-java","category-back"],"featured_image_urls":{"full":"","thumbnail":"","medium":"","medium_large":"","large":"","1536x1536":"","2048x2048":""},"author_info":{"info":["\u9648 \u67d0\u4eba"]},"category_info":"<a href=\"https:\/\/mitongxue.cn\/index.php\/category\/back\/java\/\" rel=\"category tag\">Java<\/a> <a href=\"https:\/\/mitongxue.cn\/index.php\/category\/back\/\" rel=\"category tag\">\u540e\u7aef<\/a>","tag_info":"\u540e\u7aef","comment_count":"0","_links":{"self":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts\/77","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/comments?post=77"}],"version-history":[{"count":1,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts\/77\/revisions"}],"predecessor-version":[{"id":78,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts\/77\/revisions\/78"}],"wp:attachment":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/media?parent=77"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/categories?post=77"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/tags?post=77"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}