{"id":9,"date":"2024-07-06T17:22:50","date_gmt":"2024-07-06T09:22:50","guid":{"rendered":"http:\/\/note.ui11.cc\/?p=9"},"modified":"2024-07-06T17:22:53","modified_gmt":"2024-07-06T09:22:53","slug":"%e5%8d%a0%e4%bd%8d%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/note.ui11.cc\/index.php\/2024\/07\/06\/%e5%8d%a0%e4%bd%8d%e7%ac%a6\/","title":{"rendered":"\u5360\u4f4d\u7b26"},"content":{"rendered":"\n

\u5728\u4e0d\u540c\u7684\u4e0a\u4e0b\u6587\u4e2d\uff0c”\u5360\u4f4d\u7b26”\uff08Placeholder\uff09\u53ef\u4ee5\u6709\u4e0d\u540c\u7684\u542b\u4e49\u3002\u4ee5\u4e0b\u662f\u51e0\u79cd\u5e38\u89c1\u7684\u5360\u4f4d\u7b26\u6982\u5ff5\uff1a<\/p>\n\n\n\n

1. \u6587\u672c\u5360\u4f4d\u7b26\uff08Text Placeholder\uff09<\/h3>\n\n\n\n

\u5728\u6587\u672c\u7f16\u8f91\u6216\u5904\u7406\u4e2d\uff0c\u5360\u4f4d\u7b26\u901a\u5e38\u6307\u4ee3\u4e00\u4e2a\u4e34\u65f6\u7684\u6587\u672c\u6216\u7b26\u53f7\uff0c\u7528\u4e8e\u8868\u793a\u5c06\u6765\u4f1a\u63d2\u5165\u5b9e\u9645\u5185\u5bb9\u7684\u4f4d\u7f6e\u3002\u4f8b\u5982\uff0c\u5728\u8bbe\u8ba1\u6587\u6863\u6a21\u677f\u65f6\uff0c\u53ef\u80fd\u4f1a\u4f7f\u7528\u5360\u4f4d\u7b26\u6765\u8868\u793a\u7528\u6237\u9700\u8981\u586b\u5199\u7684\u4fe1\u606f\uff0c\u5982\u59d3\u540d\u3001\u5730\u5740\u7b49\u3002<\/p>\n\n\n\n

2. \u7f16\u7a0b\u4e2d\u7684\u5360\u4f4d\u7b26<\/h3>\n\n\n\n

\u5728\u7f16\u7a0b\u4e2d\uff0c\u5360\u4f4d\u7b26\u53ef\u4ee5\u6307\u4ee3\u4e00\u4e2a\u4e34\u65f6\u7684\u53d8\u91cf\u6216\u503c\uff0c\u7528\u4e8e\u5728\u4ee3\u7801\u4e2d\u5360\u4f4d\uff0c\u76f4\u5230\u5b9e\u9645\u7684\u503c\u88ab\u786e\u5b9a\u6216\u8ba1\u7b97\u51fa\u6765\u3002\u4f8b\u5982\uff0c\u5728\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u4e2d\uff0c\u5360\u4f4d\u7b26\u7528\u4e8e\u6307\u5b9a\u53d8\u91cf\u503c\u63d2\u5165\u7684\u4f4d\u7f6e\u3002<\/p>\n\n\n\n

String name = \"Alice\";\nString message = \"Hello, %s!\";\nSystem.out.println(String.format(message, name)); \/\/ \u8f93\u51fa: Hello, Alice!<\/code><\/pre>\n\n\n\n
\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c%s<\/code>\u00a0\u662f\u4e00\u4e2a\u5360\u4f4d\u7b26\uff0c\u5b83\u5728\u00a0String.format<\/code>\u00a0\u65b9\u6cd5\u4e2d\u88ab\u5b9e\u9645\u7684\u00a0name<\/code>\u00a0\u53d8\u91cf\u503c\u66ff\u6362\u3002<\/p>\n\n\n\n
3. \u6570\u636e\u5e93\u4e2d\u7684\u5360\u4f4d\u7b26<\/h3>\n\n\n\n
\u5728\u6570\u636e\u5e93\u64cd\u4f5c\u4e2d\uff0c\u5360\u4f4d\u7b26\u901a\u5e38\u7528\u4e8e SQL \u8bed\u53e5\u4e2d\uff0c\u8868\u793a\u4e00\u4e2a\u5c06\u88ab\u5b9e\u9645\u53c2\u6570\u503c\u66ff\u6362\u7684\u4f4d\u7f6e\u3002\u8fd9\u5728\u9884\u7f16\u8bd1 SQL \u8bed\u53e5\uff08\u5982\u4f7f\u7528 JDBC \u7684 PreparedStatement<\/code>\uff09\u65f6\u975e\u5e38\u6709\u7528\uff0c\u53ef\u4ee5\u9632\u6b62 SQL \u6ce8\u5165\u653b\u51fb\uff0c\u5e76\u63d0\u9ad8\u6027\u80fd<\/p>\n\n\n\n
String sql = \"SELECT * FROM users WHERE name = ?\";\nPreparedStatement pstmt = connection.prepareStatement(sql);\npstmt.setString(1, \"Alice\");\nResultSet rs = pstmt.executeQuery();<\/code><\/pre>\n\n\n\n
\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c?<\/code> \u662f\u4e00\u4e2a\u5360\u4f4d\u7b26\uff0c\u5b83\u5728\u6267\u884c PreparedStatement<\/code> \u65f6\u88ab setString<\/code> \u65b9\u6cd5\u63d0\u4f9b\u7684\u5b9e\u9645\u503c\u66ff\u6362\u3002<\/p>\n\n\n\n
4. HTML\u4e2d\u7684\u5360\u4f4d\u7b26<\/h3>\n\n\n\n
\u5728 HTML \u4e2d\uff0c\u5360\u4f4d\u7b26\u53ef\u4ee5\u6307\u4ee3\u4e00\u4e2a\u8f93\u5165\u5b57\u6bb5\u7684\u63d0\u793a\u6587\u672c\uff0c\u5f53\u7528\u6237\u5f00\u59cb\u8f93\u5165\u65f6\uff0c\u63d0\u793a\u6587\u672c\u4f1a\u6d88\u5931\u3002\u8fd9\u901a\u5e38\u901a\u8fc7 placeholder<\/code> \u5c5e\u6027\u5b9e\u73b0\u3002<\/p>\n\n\n\n
<input type=\"text\" name=\"username\" placeholder=\"Enter your username\"><\/code><\/pre>\n\n\n\n
\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u5f53\u7528\u6237\u672a\u8f93\u5165\u4efb\u4f55\u5185\u5bb9\u65f6\uff0c\u8f93\u5165\u6846\u4e2d\u4f1a\u663e\u793a “Enter your username” \u4f5c\u4e3a\u63d0\u793a\u3002<\/span>
\u603b\u7ed3<\/h3>
\u5360\u4f4d\u7b26\u662f\u4e00\u79cd\u4e34\u65f6\u7684\u66ff\u4ee3\u7269\uff0c\u7528\u4e8e\u5728\u6700\u7ec8\u5185\u5bb9\u786e\u5b9a\u4e4b\u524d\u5360\u4f4f\u67d0\u4e2a\u4f4d\u7f6e\u6216\u8868\u793a\u67d0\u4e2a\u503c\u3002\u5b83\u4eec\u5728\u6587\u672c\u5904\u7406\u3001\u7f16\u7a0b\u3001\u6570\u636e\u5e93\u64cd\u4f5c\u548c HTML \u8f93\u5165\u5b57\u6bb5\u4e2d\u90fd\u6709\u5e7f\u6cdb\u7684\u5e94\u7528\uff0c\u4ee5\u63d0\u9ad8\u7075\u6d3b\u6027\u548c\u7528\u6237\u4f53\u9a8c\u3002<\/p><\/div><\/div><\/div><\/div><\/div><\/div>
<\/path><\/path><\/svg><\/span><\/div>
<\/path><\/path><\/path><\/svg><\/a><\/div>
<\/path><\/path><\/svg><\/span><\/div>
<\/path><\/path><\/svg><\/span><\/div>
<\/path><\/path><\/path><\/svg><\/span><\/div><\/div>
<\/path><\/path><\/path><\/svg><\/div><\/div><\/div><\/div><\/div><\/div><\/div>
<\/div><\/div><\/p>\n\n\n\n
<\/p>\n\n\n\n
<\/p>\n\n\n\n
<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u4e0d\u540c\u7684\u4e0a\u4e0b\u6587\u4e2d\uff0c”\u5360\u4f4d\u7b26”\uff08Placeholder\uff09\u53ef\u4ee5\u6709\u4e0d\u540c\u7684\u542b\u4e49\u3002\u4ee5\u4e0b\u662f\u51e0\u79cd\u5e38\u89c1 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-9","post","type-post","status-publish","format-standard","hentry","category-javase"],"_links":{"self":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/9","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/comments?post=9"}],"version-history":[{"count":1,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/9\/revisions"}],"predecessor-version":[{"id":10,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/9\/revisions\/10"}],"wp:attachment":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/media?parent=9"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/categories?post=9"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/tags?post=9"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}