{"id":173833,"date":"2024-11-07T20:19:22","date_gmt":"2024-11-07T12:19:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/173833\/"},"modified":"2024-11-07T20:19:23","modified_gmt":"2024-11-07T12:19:23","slug":"%e5%a6%82%e4%bd%95%e8%a7%a3%e6%b1%bajava%e7%a8%8b%e5%ba%8f%e4%b8%ad%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e5%a4%aa%e9%95%b7%e7%9a%84%e7%95%b0%e5%b8%b8%e5%95%8f%e9%a1%8c%ef%bc%9f-java-%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/173833\/","title":{"rendered":"\u5982\u4f55\u89e3\u6c7aJava\u7a0b\u5e8f\u4e2d\u6578\u64da\u5eab\u5b57\u6bb5\u592a\u9577\u7684\u7570\u5e38\u554f\u984c\uff1f (java \u6578\u64da\u5eab\u5b57\u6bb5\u592a\u9577 \u7570\u5e38)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e8%a7%a3%e6%b1%bajava%e7%a8%8b%e5%ba%8f%e4%b8%ad%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e5%a4%aa%e9%95%b7%e7%9a%84%e7%95%b0%e5%b8%b8%e5%95%8f%e9%a1%8c%ef%bc%9f-OrDUgUGpeK\">\u5982\u4f55\u89e3\u6c7aJava\u7a0b\u5e8f\u4e2d\u6578\u64da\u5eab\u5b57\u6bb5\u592a\u9577\u7684\u7570\u5e38\u554f\u984c\uff1f<\/h1>\n<p>\u5728\u958b\u767cJava\u61c9\u7528\u7a0b\u5e8f\u6642\uff0c\u8207\u6578\u64da\u5eab\u7684\u4ea4\u4e92\u662f\u4e0d\u53ef\u907f\u514d\u7684\u3002\u7136\u800c\uff0c\u7576\u6578\u64da\u5eab\u4e2d\u7684\u5b57\u6bb5\u9577\u5ea6\u8d85\u904e\u9810\u8a2d\u7684\u9650\u5236\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u7570\u5e38\u554f\u984c\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u63a2\u8a0e\u5982\u4f55\u6709\u6548\u89e3\u6c7aJava\u7a0b\u5e8f\u4e2d\u6578\u64da\u5eab\u5b57\u6bb5\u592a\u9577\u7684\u7570\u5e38\u554f\u984c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u5efa\u8b70\u548c\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e7%95%b0%e5%b8%b8%e7%9a%84%e6%a0%b9%e6%9c%ac%e5%8e%9f%e5%9b%a0-OrDUgUGpeK\">\u7570\u5e38\u7684\u6839\u672c\u539f\u56e0<\/h2>\n<p>\u5728Java\u4e2d\uff0c\u7576\u6211\u5011\u5617\u8a66\u5c07\u4e00\u500b\u8d85\u904e\u6578\u64da\u5eab\u5b57\u6bb5\u5b9a\u7fa9\u9577\u5ea6\u7684\u5b57\u7b26\u4e32\u63d2\u5165\u5230\u6578\u64da\u5eab\u4e2d\u6642\uff0c\u901a\u5e38\u6703\u5f15\u767c\u4e00\u500b\u7570\u5e38\u3002\u9019\u7a2e\u7570\u5e38\u901a\u5e38\u662f\u7531\u65bc\u4ee5\u4e0b\u5e7e\u500b\u539f\u56e0\u9020\u6210\u7684\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u5eab\u5b57\u6bb5\u5b9a\u7fa9\u4e0d\u7576\uff1a<\/strong>\u5728\u5275\u5efa\u6578\u64da\u5eab\u8868\u6642\uff0c\u5b57\u6bb5\u7684\u9577\u5ea6\u53ef\u80fd\u8a2d\u7f6e\u5f97\u904e\u77ed\uff0c\u7121\u6cd5\u5bb9\u7d0d\u5be6\u969b\u9700\u8981\u5b58\u5132\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u6578\u64da\u9a57\u8b49\u4e0d\u8db3\uff1a<\/strong>\u5728\u5c07\u6578\u64da\u63d2\u5165\u6578\u64da\u5eab\u4e4b\u524d\uff0c\u672a\u5c0d\u6578\u64da\u9032\u884c\u5145\u5206\u7684\u9a57\u8b49\uff0c\u5c0e\u81f4\u9577\u5ea6\u8d85\u904e\u9650\u5236\u3002<\/li>\n<li><strong>\u61c9\u7528\u7a0b\u5e8f\u908f\u8f2f\u932f\u8aa4\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u61c9\u7528\u7a0b\u5e8f\u7684\u908f\u8f2f\u53ef\u80fd\u6703\u5c0e\u81f4\u751f\u6210\u904e\u9577\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-OrDUgUGpeK\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u70ba\u4e86\u89e3\u6c7aJava\u7a0b\u5e8f\u4e2d\u6578\u64da\u5eab\u5b57\u6bb5\u592a\u9577\u7684\u7570\u5e38\u554f\u984c\uff0c\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e8%aa%bf%e6%95%b4%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%97%e6%ae%b5%e9%95%b7%e5%ba%a6-OrDUgUGpeK\">1. \u8abf\u6574\u6578\u64da\u5eab\u5b57\u6bb5\u9577\u5ea6<\/h3>\n<p>\u6700\u76f4\u63a5\u7684\u89e3\u6c7a\u65b9\u6848\u662f\u8abf\u6574\u6578\u64da\u5eab\u4e2d\u5b57\u6bb5\u7684\u9577\u5ea6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4e00\u500b\u5b57\u6bb5\u5b9a\u7fa9\u70baVARCHAR(50)\uff0c\u800c\u5be6\u969b\u9700\u8981\u5b58\u5132\u7684\u6578\u64da\u9577\u5ea6\u53ef\u80fd\u9054\u5230100\u500b\u5b57\u7b26\uff0c\u5247\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u4fee\u6539\u5b57\u6bb5\u9577\u5ea6\uff1a<\/p>\n<pre><code>ALTER TABLE your_table_name MODIFY your_column_name VARCHAR(100);<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u80fd\u5920\u5bb9\u7d0d\u66f4\u9577\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<h3 id=\"2-%e5%9c%a8java%e4%b8%ad%e9%80%b2%e8%a1%8c%e6%95%b8%e6%93%9a%e9%a9%97%e8%ad%89-OrDUgUGpeK\">2. \u5728Java\u4e2d\u9032\u884c\u6578\u64da\u9a57\u8b49<\/h3>\n<p>\u5728\u5c07\u6578\u64da\u63d2\u5165\u6578\u64da\u5eab\u4e4b\u524d\uff0c\u61c9\u8a72\u5728Java\u4ee3\u78bc\u4e2d\u9032\u884c\u6578\u64da\u9a57\u8b49\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u78bc\u793a\u4f8b\u4f86\u6aa2\u67e5\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\uff1a<\/p>\n<pre><code>if (inputString.length() &gt; 50) {\n    throw new IllegalArgumentException(\"\u8f38\u5165\u7684\u5b57\u7b26\u4e32\u9577\u5ea6\u8d85\u904e\u9650\u5236\uff01\");\n}<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u5728\u6578\u64da\u63d2\u5165\u4e4b\u524d\u6355\u7372\u6f5b\u5728\u7684\u554f\u984c\uff0c\u907f\u514d\u7570\u5e38\u7684\u767c\u751f\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e7%95%b0%e5%b8%b8%e8%99%95%e7%90%86%e6%a9%9f%e5%88%b6-OrDUgUGpeK\">3. \u4f7f\u7528\u7570\u5e38\u8655\u7406\u6a5f\u5236<\/h3>\n<p>\u5728Java\u4e2d\uff0c\u4f7f\u7528try-catch\u584a\u4f86\u6355\u7372\u7570\u5e38\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u7570\u5e38\u767c\u751f\u6642\u63d0\u4f9b\u53cb\u597d\u7684\u932f\u8aa4\u4fe1\u606f\uff0c\u800c\u4e0d\u662f\u8b93\u7a0b\u5e8f\u5d29\u6f70\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>try {\n    \/\/ \u5617\u8a66\u63d2\u5165\u6578\u64da\n} catch (SQLException e) {\n    System.out.println(\"\u6578\u64da\u5eab\u7570\u5e38\uff1a\" + e.getMessage());\n}<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u7a69\u5b9a\u6027\u548c\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n<h3 id=\"4-%e5%84%aa%e5%8c%96%e6%87%89%e7%94%a8%e7%a8%8b%e5%ba%8f%e9%82%8f%e8%bc%af-OrDUgUGpeK\">4. \u512a\u5316\u61c9\u7528\u7a0b\u5e8f\u908f\u8f2f<\/h3>\n<p>\u6aa2\u67e5\u61c9\u7528\u7a0b\u5e8f\u7684\u908f\u8f2f\uff0c\u78ba\u4fdd\u751f\u6210\u7684\u5b57\u7b26\u4e32\u4e0d\u6703\u8d85\u904e\u9810\u5b9a\u7684\u9577\u5ea6\u3002\u9019\u53ef\u80fd\u6d89\u53ca\u5230\u5c0d\u7528\u6236\u8f38\u5165\u7684\u9650\u5236\u6216\u5c0d\u6578\u64da\u8655\u7406\u908f\u8f2f\u7684\u8abf\u6574\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-OrDUgUGpeK\">\u7d50\u8ad6<\/h2>\n<p>\u5728Java\u7a0b\u5e8f\u4e2d\u8655\u7406\u6578\u64da\u5eab\u5b57\u6bb5\u592a\u9577\u7684\u7570\u5e38\u554f\u984c\u9700\u8981\u5f9e\u591a\u500b\u65b9\u9762\u5165\u624b\uff0c\u5305\u62ec\u8abf\u6574\u6578\u64da\u5eab\u8a2d\u8a08\u3001\u52a0\u5f37\u6578\u64da\u9a57\u8b49\u3001\u4f7f\u7528\u7570\u5e38\u8655\u7406\u6a5f\u5236\u4ee5\u53ca\u512a\u5316\u61c9\u7528\u7a0b\u5e8f\u908f\u8f2f\u3002\u901a\u904e\u9019\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u6e1b\u5c11\u7570\u5e38\u7684\u767c\u751f\uff0c\u63d0\u9ad8\u61c9\u7528\u7a0b\u5e8f\u7684\u7a69\u5b9a\u6027\u548c\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684Java\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u89e3\u6c7aJava\u7a0b\u5e8f\u4e2d\u6578\u64da\u5eab\u5b57\u6bb5\u904e\u9577\u7570\u5e38\u7684\u6709\u6548\u65b9\u6cd5\uff0c\u5305\u62ec\u8abf\u6574\u5b57\u6bb5\u9577\u5ea6\u3001\u6578\u64da\u9a57\u8b49\u53ca\u7570\u5e38\u8655\u7406\u6280\u5de7\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-173833","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=173833"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173833\/revisions"}],"predecessor-version":[{"id":173834,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173833\/revisions\/173834"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=173833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=173833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=173833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}