{"id":2488,"date":"2023-02-18T09:43:46","date_gmt":"2023-02-18T01:43:46","guid":{"rendered":"https:\/\/hsin-life.com\/?p=2488"},"modified":"2023-02-21T22:41:52","modified_gmt":"2023-02-21T14:41:52","slug":"%e6%8f%90%e5%8d%87%e4%bd%a0%e7%9a%84-jsp-%e9%96%8b%e7%99%bc%e6%95%88%e7%8e%87%ef%bc%9a%e4%ba%86%e8%a7%a3-jstl-%e7%9a%84%e5%bc%b7%e5%a4%a7%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/hsin-life.com\/archives\/2488","title":{"rendered":"\u63d0\u5347\u4f60\u7684 JSP \u958b\u767c\u6548\u7387\uff1a\u4e86\u89e3 JSTL \u7684\u5f37\u5927\u529f\u80fd"},"content":{"rendered":"\n

JSTL (JSP Standard Tag Library) \u662f\u4e00\u500b\u7528\u65bc JSP (JavaServer Pages) \u7684\u6a19\u7c64\u5eab\uff0c\u63d0\u4f9b\u4e86\u8a31\u591a\u5e38\u7528\u7684\u6a19\u7c64\uff0c\u7528\u65bc\u7c21\u5316 JSP \u9801\u9762\u7684\u958b\u767c\u3002<\/p>\n\n\n\n

JSTL \u652f\u6301\u56db\u7a2e\u985e\u578b\u7684\u6a19\u7c64\uff1a\u63a7\u5236\u6a19\u7c64\u3001\u683c\u5f0f\u5316\u6a19\u7c64\u3001SQL \u6a19\u7c64\u548c XML \u6a19\u7c64\u3002<\/p>\n\n\n\n

\u5e38\u7528\u7684\u63a7\u5236\u6a19\u7c64\u5305\u62ec c:forEach\u3001c:if\u3001c:set \u548c c:url\uff1b\u5e38\u7528\u7684\u683c\u5f0f\u5316\u6a19\u7c64\u5305\u62ec c:out\uff1b\u5e38\u7528\u7684 SQL \u6a19\u7c64\u5305\u62ec sql:query \u548c sql:update\uff1b\u5e38\u7528\u7684 XML \u6a19\u7c64\u5305\u62ec x:out\u3002<\/p>\n\n\n\n

\u4f7f\u7528 JSTL \u53ef\u4ee5\u7c21\u5316 JSP \u9801\u9762\u7684\u958b\u767c\uff0c\u63d0\u9ad8\u958b\u767c\u6548\u7387<\/p>\n\n\n\n

JSTL \u63d0\u4f9b\u4e86\u8a31\u591a\u6709\u7528\u7684\u6a19\u7c64\uff0c\u4ee5\u5e6b\u52a9\u958b\u767c\u4eba\u54e1\u7c21\u5316 JSP \u9801\u9762\u7684\u958b\u767c<\/p>\n\n\n\n

\u4ee5\u4e0b\u662f JSTL \u4e2d\u4e94\u7a2e\u5e38\u7528\u7684\u6a19\u7c64<\/p>\n\n\n\n

c:forEach\uff1a\u7528\u65bc\u8ff4\u5708\u904d\u6b77\u96c6\u5408\u6216\u6578\u7d44\uff0c\u53ef\u4ee5\u7528\u65bc\u5728 JSP \u9801\u9762\u4e2d\u986f\u793a\u5217\u8868\u6578\u64da<\/p>\n\n\n\n

c:if\uff1a\u7528\u65bc\u5728 JSP \u9801\u9762\u4e2d\u57f7\u884c\u689d\u4ef6\u8a9e\u53e5\uff0c\u53ef\u4ee5\u7528\u65bc\u986f\u793a\u6216\u96b1\u85cf\u9801\u9762\u5143\u7d20<\/p>\n\n\n\n

c:set\uff1a\u7528\u65bc\u5728 JSP \u9801\u9762\u4e2d\u8a2d\u7f6e\u8b8a\u91cf\u503c\uff0c\u53ef\u4ee5\u7528\u65bc\u5728\u9801\u9762\u4e2d\u5171\u4eab\u6578\u64da<\/p>\n\n\n\n

c:out\uff1a\u7528\u65bc\u5728 JSP \u9801\u9762\u4e2d\u8f38\u51fa\u8b8a\u91cf\u7684\u503c\uff0c\u53ef\u4ee5\u7528\u65bc\u5728\u9801\u9762\u4e2d\u986f\u793a\u52d5\u614b\u6578\u64da<\/p>\n\n\n\n

c:url\uff1a\u7528\u65bc\u5728 JSP \u9801\u9762\u4e2d\u751f\u6210 URL\uff0c\u53ef\u4ee5\u7528\u65bc\u5728\u9801\u9762\u4e2d\u69cb\u5efa\u8d85\u93c8\u63a5<\/p>\n\n\n\n

\u9019\u4e9b\u6a19\u7c64\u90fd\u662f JSTL \u4e2d\u5e38\u7528\u7684\u6a19\u7c64\uff0c\u5ee3\u6cdb\u7528\u65bc Java Web \u61c9\u7528\u7a0b\u5e8f\u7684\u958b\u767c<\/p>\n\n\n\n

\u4f7f\u7528 JSTL \u6a19\u7c64\u53ef\u4ee5\u7c21\u5316 JSP \u9801\u9762\u7684\u958b\u767c\uff0c\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u91cd\u7528\u6027\u548c\u53ef\u7dad\u8b77\u6027\uff0c\u5e6b\u52a9\u958b\u767c\u4eba\u54e1\u66f4\u5feb\u66f4\u9ad8\u6548\u5730\u958b\u767c Web \u61c9\u7528\u7a0b\u5e8f<\/p>\n\n\n\n

\u4f7f\u7528 JSTL<\/h2>\n\n\n\n

\u52a0\u5165 JSTL \u6a19\u7c64\u5eab\uff1a\u5728 JSP \u9801\u9762\u4e2d\uff0c\u60a8\u9700\u8981\u901a\u904e\u6a19\u7c64 <%@ taglib %> \u52a0\u5165 JSTL \u6a19\u7c64\u5eab\uff0c\u5176\u4e2d\u7684 uri \u5c6c\u6027\u6307\u5411 JSTL \u6a19\u7c64\u5eab\u7684\u4f4d\u7f6e\uff0cprefix \u5c6c\u6027\u6307\u5b9a\u60a8\u5e0c\u671b\u4f7f\u7528\u7684\u6a19\u7c64\u524d\u7db4\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n

<%@ taglib prefix=\"c\" uri=\"http:\/\/java.sun.com\/jsp\/jstl\/core\" %><\/code><\/pre>\n\n\n\n
c:forEach<\/h2>\n\n\n\n
c:forEach \u662f JSTL \u4e2d\u4e00\u500b\u5e38\u7528\u7684\u6a19\u7c64\uff0c\u7528\u65bc\u5728 JSP \u9801\u9762\u4e2d\u9032\u884c\u8ff4\u5708\u904d\u6b77\u3002<\/p>\n\n\n\n
\u5b83\u53ef\u4ee5\u7528\u65bc\u904d\u6b77\u96c6\u5408\u548c\u6578\u7d44\uff0c\u4e26\u5728\u9801\u9762\u4e2d\u986f\u793a\u5217\u8868\u6578\u64da\u3002<\/p>\n\n\n\n
c:forEach \u6a19\u7c64\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
<c:forEach items=\"${\u96c6\u5408\u6216\u6578\u7d44}\" var=\"\u904d\u6b77\u8b8a\u91cf\">\n   <!-- \u904d\u6b77\u5167\u5bb9 -->\n<\/c:forEach><\/code><\/pre>\n\n\n\n
\u5176\u4e2d\uff0citems<\/code> \u5c6c\u6027\u6307\u5b9a\u9700\u8981\u904d\u6b77\u7684\u96c6\u5408\u6216\u6578\u7d44\uff0cvar<\/code> \u5c6c\u6027\u6307\u5b9a\u904d\u6b77\u8b8a\u91cf\u7684\u540d\u7a31\uff0c\u6bcf\u6b21\u8ff4\u5708\u90fd\u5c07\u8b8a\u91cf\u8a2d\u7f6e\u70ba\u96c6\u5408\u6216\u6578\u7d44\u4e2d\u7684\u4e0b\u4e00\u500b\u5143\u7d20\u3002<\/p>\n\n\n\n
1, 2, 3, 4, 5<\/code><\/pre>\n\n\n\n
\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 c:forEach \u6a19\u7c64\u904d\u6b77\u9019\u500b\u6578\u7d44\uff0c\u4e26\u5728\u9801\u9762\u4e2d\u986f\u793a\u6bcf\u500b\u6578\u5b57\uff1a<\/p>\n\n\n\n
<c:forEach items=\"${numbers}\" var=\"number\">\n   ${number}<br>\n<\/c:forEach><\/code><\/pre>\n\n\n\n
\u8f38\u51fa\u7d50\u679c\u5c07\u662f\uff1a<\/p>\n\n\n\n
1\n2\n3\n4\n5<\/code><\/pre>\n\n\n\n
\u9019\u6a23\uff0c\u6211\u5011\u5c31\u53ef\u4ee5\u4f7f\u7528 c:forEach \u6a19\u7c64\u8f15\u9b06\u904d\u6b77\u96c6\u5408\u6216\u6578\u7d44\uff0c\u4e26\u5728 JSP \u9801\u9762\u4e2d\u986f\u793a\u5217\u8868\u6578\u64da\u3002<\/p>\n\n\n\n
\u4f7f\u7528 c:forEach \u6a19\u7c64\u6709\u4ee5\u4e0b\u512a\u9ede\uff1a<\/p>\n\n\n\n
    \n
  1. \u8ff4\u5708\u904d\u6b77\uff1ac:forEach \u6a19\u7c64\u53ef\u4ee5\u5728 JSP \u9801\u9762\u4e2d\u5faa\u74b0\u904d\u6b77\u96c6\u5408\u6216\u6578\u7d44\uff0c\u4ee5\u986f\u793a\u5217\u8868\u6578\u64da\u3002<\/li>\n\n\n\n
  2. \u7a0b\u5f0f\u78bc\u7c21\u5316\uff1a\u4f7f\u7528 c:forEach \u6a19\u7c64\u53ef\u4ee5\u7c21\u5316\u4ee3\u78bc\uff0c\u56e0\u70ba\u4e0d\u9700\u8981\u4f7f\u7528\u9577\u4e32\u7684 Java \u4ee3\u78bc\u9032\u884c\u8ff4\u5708\u904d\u6b77\u3002<\/li>\n\n\n\n
  3. \u53ef\u8b80\u6027\uff1a\u4f7f\u7528 c:forEach \u6a19\u7c64\u53ef\u4ee5\u4f7f\u4ee3\u78bc\u66f4\u6613\u8b80\uff0c\u5f9e\u800c\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u7dad\u8b77\u6027\u3002<\/li>\n\n\n\n
  4. \u9ad8\u6548\u6027\uff1ac:forEach \u6a19\u7c64\u662f JSTL \u7684\u4e00\u90e8\u5206\uff0c\u5728 JSTL \u7684\u5f15\u64ce\u4e2d\u57f7\u884c\uff0c\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u78bc\u7684\u57f7\u884c\u6548\u7387\u3002<\/li>\n<\/ol>\n\n\n\n
    \u7e3d\u7684\u4f86\u8aaa\uff0c\u4f7f\u7528 c:forEach \u6a19\u7c64\u53ef\u4ee5\u8b93\u4f60\u7684 JSP \u9801\u9762\u66f4\u9032\u884c\u8ff4\u5708\u904d\u6b77\u3001\u7c21\u5316\u4ee3\u78bc\u3001\u6613\u8b80\u3001\u9ad8\u6548\u3002<\/p>\n\n\n\n
    \u5982\u679c\u4f60\u662f JSP \u958b\u767c\u8005\uff0c\u5efa\u8b70\u4f60\u4f7f\u7528 c:forEach \u6a19\u7c64\u4ee5\u986f\u793a\u5217\u8868\u6578\u64da\u3002<\/p>\n\n\n\n
    c:if<\/h2>\n\n\n\n
    c:if \u662f JSTL \u4e2d\u4e00\u500b\u5e38\u7528\u7684\u6a19\u7c64\uff0c\u7528\u65bc\u5728 JSP \u9801\u9762\u4e2d\u57f7\u884c\u689d\u4ef6\u8a9e\u53e5\u3002<\/p>\n\n\n\n
    \u5b83\u53ef\u4ee5\u7528\u65bc\u63a7\u5236\u9801\u9762\u5143\u7d20\u7684\u986f\u793a\u548c\u96b1\u85cf\uff0c\u6839\u64da\u7279\u5b9a\u7684\u689d\u4ef6\u662f\u5426\u6210\u7acb\u3002<\/p>\n\n\n\n
    c:if \u6a19\u7c64\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
    <c:if test=\"\u689d\u4ef6\u8868\u9054\u5f0f\">\n   <!-- \u689d\u4ef6\u6210\u7acb\u6642\u7684\u5167\u5bb9 -->\n<\/c:if><\/code><\/pre>\n\n\n\n
    \u5176\u4e2d\uff0ctest<\/code> \u5c6c\u6027\u6307\u5b9a\u689d\u4ef6\u8868\u9054\u5f0f\uff0c\u7576\u8868\u9054\u5f0f\u7684\u503c\u70ba true \u6642\uff0c\u5c07\u986f\u793a\u5167\u5bb9\uff1b\u5426\u5247\uff0c\u5167\u5bb9\u5c07\u4e0d\u986f\u793a\u3002<\/p>\n\n\n\n
    \u8209\u500b\u4f8b\u5b50\uff0c\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u8b8a\u91cf isAdmin<\/code>\uff0c\u8868\u793a\u7576\u524d\u7528\u6236\u662f\u5426\u70ba\u7ba1\u7406\u54e1\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 c:if \u6a19\u7c64\u63a7\u5236\u4e00\u500b\u9801\u9762\u5143\u7d20\u7684\u986f\u793a\uff1a<\/p>\n\n\n\n
    <c:if test=\"${isAdmin}\">\n   <p>\u60a8\u662f\u7ba1\u7406\u54e1\uff0c\u53ef\u4ee5\u8a2a\u554f\u7ba1\u7406\u9801\u9762\u3002<\/p>\n<\/c:if><\/code><\/pre>\n\n\n\n
    \u5982\u679c isAdmin<\/code> \u7684\u503c\u70ba true\uff0c\u5247\u9801\u9762\u5c07\u986f\u793a\uff1a<\/p>\n\n\n\n
    \u60a8\u662f\u7ba1\u7406\u54e1\uff0c\u53ef\u4ee5\u8a2a\u554f\u7ba1\u7406\u9801\u9762\u3002<\/code><\/pre>\n\n\n\n
    \u5426\u5247\uff0c\u9801\u9762\u5c07\u4e0d\u986f\u793a\u4efb\u4f55\u5167\u5bb9\u3002<\/p>\n\n\n\n
    \u9019\u6a23\uff0c\u6211\u5011\u5c31\u53ef\u4ee5\u4f7f\u7528 c:if \u6a19\u7c64\u6839\u64da\u7279\u5b9a\u7684\u689d\u4ef6\u986f\u793a\u6216\u96b1\u85cf\u9801\u9762\u5143\u7d20\uff0c\u5be6\u73fe\u9801\u9762\u7684\u52d5\u614b\u63a7\u5236\u3002<\/p>\n\n\n\n
    \u4f7f\u7528 c:if \u6a19\u7c64\u6709\u4ee5\u4e0b\u512a\u9ede\uff1a<\/p>\n\n\n\n
      \n
    1. \u689d\u4ef6\u8a9e\u53e5\uff1ac:if \u6a19\u7c64\u53ef\u4ee5\u5728 JSP \u9801\u9762\u4e2d\u57f7\u884c\u689d\u4ef6\u8a9e\u53e5\uff0c\u4ee5\u63a7\u5236\u9801\u9762\u5143\u7d20\u7684\u986f\u793a\u6216\u96b1\u85cf\u3002<\/li>\n\n\n\n
    2. \u7a0b\u5f0f\u78bc\u7c21\u5316\uff1a\u4f7f\u7528 c:if \u6a19\u7c64\u53ef\u4ee5\u7c21\u5316\u4ee3\u78bc\uff0c\u56e0\u70ba\u4e0d\u9700\u8981\u4f7f\u7528\u9577\u4e32\u7684 Java \u4ee3\u78bc\u9032\u884c\u689d\u4ef6\u5224\u65b7\u3002<\/li>\n\n\n\n
    3. \u53ef\u8b80\u6027\uff1a\u4f7f\u7528 c:if \u6a19\u7c64\u53ef\u4ee5\u4f7f\u4ee3\u78bc\u66f4\u6613\u8b80\uff0c\u5f9e\u800c\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u7dad\u8b77\u6027\u3002<\/li>\n\n\n\n
    4. \u9ad8\u6548\u6027\uff1ac:if \u6a19\u7c64\u662f JSTL \u7684\u4e00\u90e8\u5206\uff0c\u5728 JSTL \u7684\u5f15\u64ce\u4e2d\u57f7\u884c\uff0c\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u78bc\u7684\u57f7\u884c\u6548\u7387\u3002<\/li>\n<\/ol>\n\n\n\n
      \u7e3d\u7684\u4f86\u8aaa\uff0c\u4f7f\u7528 c:if \u6a19\u7c64\u53ef\u4ee5\u8b93\u4f60\u7684 JSP \u9801\u9762\u66f4\u9032\u884c\u689d\u4ef6\u5224\u65b7\u3001\u7c21\u5316\u4ee3\u78bc\u3001\u6613\u8b80\u3001\u9ad8\u6548\u3002<\/p>\n\n\n\n
      \u5982\u679c\u4f60\u662f JSP \u958b\u767c\u8005\uff0c\u5efa\u8b70\u4f60\u4f7f\u7528 c:if \u6a19\u7c64\u4ee5\u63a7\u5236\u9801\u9762\u5143\u7d20\u7684\u986f\u793a\u6216\u96b1\u85cf\u3002<\/p>\n\n\n\n
      c:set<\/h2>\n\n\n\n
      c:set \u662f JSTL \u4e2d\u4e00\u500b\u5e38\u7528\u7684\u6a19\u7c64\uff0c\u7528\u65bc\u5728 JSP \u9801\u9762\u4e2d\u8a2d\u7f6e\u8b8a\u91cf\u503c\u3002<\/p>\n\n\n\n
      \u5b83\u53ef\u4ee5\u7528\u65bc\u5171\u4eab\u6578\u64da\uff0c\u5728\u591a\u500b\u9801\u9762\u5143\u7d20\u4e4b\u9593\u5171\u4eab\u76f8\u540c\u7684\u4fe1\u606f\u3002<\/p>\n\n\n\n
      c:set \u6a19\u7c64\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
      <c:set var=\"\u8b8a\u91cf\u540d\u7a31\" value=\"\u8b8a\u91cf\u503c\"\/><\/code><\/pre>\n\n\n\n
      \u5176\u4e2d\uff0cvar<\/code> \u5c6c\u6027\u6307\u5b9a\u8b8a\u91cf\u7684\u540d\u7a31\uff0cvalue<\/code> \u5c6c\u6027\u6307\u5b9a\u8b8a\u91cf\u7684\u503c\u3002<\/p>\n\n\n\n
      \u8209\u500b\u4f8b\u5b50\uff0c\u5982\u679c\u6211\u5011\u60f3\u5728\u9801\u9762\u4e2d\u8a2d\u7f6e\u4e00\u500b\u8b8a\u91cf message<\/code>\uff0c\u5176\u503c\u70ba “Hello World!”\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 c:set \u6a19\u7c64\uff1a<\/p>\n\n\n\n
      <c:set var=\"message\" value=\"Hello World!\"\/><\/code><\/pre>\n\n\n\n
      \u4e4b\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u5728\u9801\u9762\u4e2d\u591a\u500b\u5730\u65b9\u4f7f\u7528\u9019\u500b\u8b8a\u91cf\uff1a<\/p>\n\n\n\n
      <p>${message}<\/p>\n<p>${message}<\/p>\n<p>${message}<\/p><\/code><\/pre>\n\n\n\n
      \u8f38\u51fa\u7d50\u679c\u5c07\u662f\uff1a<\/p>\n\n\n\n
      Hello World!\nHello World!\nHello World!<\/code><\/pre>\n\n\n\n
      \u4f7f\u7528 c:set \u6a19\u7c64\u6709\u4ee5\u4e0b\u512a\u9ede\uff1a<\/p>\n\n\n\n
        \n
      1. \u5171\u4eab\u6578\u64da\uff1ac:set \u6a19\u7c64\u53ef\u4ee5\u5728 JSP \u9801\u9762\u4e2d\u8a2d\u7f6e\u8b8a\u91cf\u503c\uff0c\u4ee5\u5171\u4eab\u6578\u64da\u5728\u4e0d\u540c\u7684\u9801\u9762\u6216\u90e8\u5206\u4e2d\u3002<\/li>\n\n\n\n
      2. \u7a0b\u5f0f\u78bc\u7c21\u5316\uff1a\u4f7f\u7528 c:set \u6a19\u7c64\u53ef\u4ee5\u7c21\u5316\u4ee3\u78bc\uff0c\u56e0\u70ba\u4e0d\u9700\u8981\u91cd\u8907\u5b9a\u7fa9\u76f8\u540c\u7684\u8b8a\u91cf\u503c\u3002<\/li>\n\n\n\n
      3. \u53ef\u8b80\u6027\uff1a\u4f7f\u7528 c:set \u6a19\u7c64\u53ef\u4ee5\u4f7f\u4ee3\u78bc\u66f4\u6613\u8b80\uff0c\u5f9e\u800c\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u7dad\u8b77\u6027\u3002<\/li>\n\n\n\n
      4. \u9ad8\u6548\u6027\uff1ac:set \u6a19\u7c64\u662f JSTL \u7684\u4e00\u90e8\u5206\uff0c\u5728 JSTL \u7684\u5f15\u64ce\u4e2d\u57f7\u884c\uff0c\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u78bc\u7684\u57f7\u884c\u6548\u7387\u3002<\/li>\n<\/ol>\n\n\n\n
        \u7e3d\u7684\u4f86\u8aaa\uff0c\u4f7f\u7528 c:set \u6a19\u7c64\u53ef\u4ee5\u8b93\u4f60\u7684 JSP \u9801\u9762\u66f4\u5171\u4eab\u6578\u64da\u3001\u7c21\u5316\u4ee3\u78bc\u3001\u6613\u8b80\u3001\u9ad8\u6548\u3002<\/p>\n\n\n\n
        \u5982\u679c\u4f60\u662f JSP \u958b\u767c\u8005\uff0c\u5efa\u8b70\u4f60\u4f7f\u7528 c:set \u6a19\u7c64\u4ee5\u5171\u4eab\u6578\u64da\u5728\u4e0d\u540c\u7684\u9801\u9762\u6216\u90e8\u5206\u4e2d\u3002<\/p>\n\n\n\n
        c:out<\/h2>\n\n\n\n
        c:out \u662f JSTL \u4e2d\u4e00\u500b\u5e38\u7528\u7684\u6a19\u7c64\uff0c\u7528\u65bc\u5728 JSP \u9801\u9762\u4e2d\u8f38\u51fa\u8b8a\u91cf\u7684\u503c\u3002<\/p>\n\n\n\n
        \u5b83\u53ef\u4ee5\u7528\u65bc\u5728\u9801\u9762\u4e2d\u986f\u793a\u52d5\u614b\u6578\u64da\uff0c\u5373\u6bcf\u6b21\u8acb\u6c42\u9801\u9762\u6642\u90fd\u4e0d\u540c\u7684\u6578\u64da\u3002<\/p>\n\n\n\n
        c:out \u6a19\u7c64\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
        <c:out value=\"${\u8b8a\u91cf\u540d\u7a31}\"\/><\/code><\/pre>\n\n\n\n
        \u5176\u4e2d\uff0cvalue<\/code> \u5c6c\u6027\u6307\u5b9a\u8b8a\u91cf\u7684\u540d\u7a31\u3002<\/p>\n\n\n\n
        \u8209\u500b\u4f8b\u5b50\uff0c\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u8b8a\u91cf username<\/code>\uff0c\u8868\u793a\u7576\u524d\u767b\u9304\u7528\u6236\u7684\u7528\u6236\u540d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 c:out \u6a19\u7c64\u5728\u9801\u9762\u4e2d\u986f\u793a\u9019\u500b\u8b8a\u91cf\u7684\u503c\uff1a<\/p>\n\n\n\n
        <p>\u6b61\u8fce\u60a8\uff0c<c:out value=\"${username}\"\/>\uff01<\/p><\/code><\/pre>\n\n\n\n
        \u5982\u679c username<\/code> \u7684\u503c\u70ba “Tom”\uff0c\u5247\u9801\u9762\u5c07\u986f\u793a\uff1a<\/p>\n\n\n\n
        \u6b61\u8fce\u60a8\uff0cTom\uff01<\/code><\/pre>\n\n\n\n
        \u9019\u6a23\uff0c\u6211\u5011\u5c31\u53ef\u4ee5\u4f7f\u7528 c:out \u6a19\u7c64\u5728 JSP \u9801\u9762\u4e2d\u8f38\u51fa\u8b8a\u91cf\u7684\u503c\uff0c\u5be6\u73fe\u9801\u9762\u6578\u64da\u7684\u52d5\u614b\u986f\u793a\u3002<\/p>\n\n\n\n
        \u4f7f\u7528 c:out \u6a19\u7c64\u7684\u539f\u56e0\u662f\u56e0\u70ba\u5b83\u6709\u4ee5\u4e0b\u512a\u9ede\uff1a<\/p>\n\n\n\n
          \n
        1. \u5b89\u5168\u6027\uff1ac:out \u6a19\u7c64\u63d0\u4f9b\u4e86\u81ea\u52d5\u8f49\u7fa9\u7279\u6b8a\u5b57\u7b26\u7684\u529f\u80fd\uff0c\u4ee5\u9632\u6b62 XSS (\u8de8\u7ad9\u8173\u672c\u653b\u64ca)\u3002<\/li>\n\n\n\n
        2. \u6613\u7528\u6027\uff1ac:out \u6a19\u7c64\u662f\u4e00\u500b\u7c21\u55ae\u6613\u7528\u7684\u6a19\u7c64\uff0c\u53ef\u4ee5\u8f15\u9b06\u5730\u5728 JSP \u9801\u9762\u4e2d\u8f38\u51fa\u8a2d\u7f6e\u597d\u7684\u8b8a\u91cf\u503c\u3002<\/li>\n\n\n\n
        3. \u53ef\u8b80\u6027\uff1a\u4f7f\u7528 c:out \u6a19\u7c64\u53ef\u4ee5\u4f7f\u4ee3\u78bc\u66f4\u6613\u8b80\uff0c\u5f9e\u800c\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u7dad\u8b77\u6027\u3002<\/li>\n\n\n\n
        4. \u9ad8\u6548\u6027\uff1ac:out \u6a19\u7c64\u662f JSTL \u7684\u4e00\u90e8\u5206\uff0c\u5728 JSTL \u7684\u5f15\u64ce\u4e2d\u57f7\u884c\uff0c\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u78bc\u7684\u57f7\u884c\u6548\u7387\u3002<\/li>\n<\/ol>\n\n\n\n
          \u7e3d\u7684\u4f86\u8aaa\uff0c\u4f7f\u7528 c:out \u6a19\u7c64\u53ef\u4ee5\u8b93\u4f60\u7684 JSP \u9801\u9762\u66f4\u5b89\u5168\u3001\u6613\u7528\u3001\u53ef\u8b80\u3001\u9ad8\u6548\u3002\u5982\u679c\u4f60\u662f JSP \u958b\u767c\u8005\uff0c\u5efa\u8b70\u4f60\u4f7f\u7528 c:out \u6a19\u7c64\u4f86\u8f38\u51fa\u52d5\u614b\u6578\u64da\u3002<\/p>\n\n\n\n
          c:url<\/h2>\n\n\n\n
          c:url \u662f JSTL \u4e2d\u4e00\u500b\u5e38\u7528\u7684\u6a19\u7c64\uff0c\u7528\u65bc\u5728 JSP \u9801\u9762\u4e2d\u751f\u6210 URL\u3002<\/p>\n\n\n\n
          \u5b83\u53ef\u4ee5\u7528\u65bc\u5728\u9801\u9762\u4e2d\u69cb\u5efa\u8d85\u93c8\u63a5\uff0c\u65b9\u4fbf\u7528\u6236\u8a2a\u554f\u5176\u4ed6\u9801\u9762\u3002<\/p>\n\n\n\n
          c:url \u6a19\u7c64\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
          <c:url var=”URL\u8b8a\u91cf\u540d\u7a31” value=”\u76ee\u6a19\u9801\u9762”\/><\/p>\n\n\n\n
          \u5176\u4e2d\uff0cvar<\/code> \u5c6c\u6027\u6307\u5b9a URL \u7684\u8b8a\u91cf\u540d\u7a31\uff0cvalue<\/code> \u5c6c\u6027\u6307\u5b9a\u76ee\u6a19\u9801\u9762\u7684 URL\u3002<\/p>\n\n\n\n
          \u8209\u500b\u4f8b\u5b50\uff0c\u5982\u679c\u6211\u5011\u60f3\u5728\u9801\u9762\u4e2d\u751f\u6210\u4e00\u500b\u6307\u5411 Google \u9996\u9801\u7684\u8d85\u93c8\u63a5\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 c:url \u6a19\u7c64\uff1a<\/p>\n\n\n\n
          <c:url var=\"googleURL\" value=\"https:\/\/www.google.com\"\/>\n<a href=\"${googleURL}\">Google<\/a><\/code><\/pre>\n\n\n\n
          \u8f38\u51fa\u7d50\u679c\u5c07\u662f\uff1a<\/p>\n\n\n\n
          <a href=”https:\/\/www.google.com”>Google<\/a><\/p>\n\n\n\n
          \u9019\u6a23\uff0c\u6211\u5011\u5c31\u53ef\u4ee5\u4f7f\u7528 c:url \u6a19\u7c64\u5728 JSP \u9801\u9762\u4e2d\u751f\u6210 URL\uff0c\u65b9\u4fbf\u7528\u6236\u8a2a\u554f\u5176\u4ed6\u9801\u9762\u3002<\/p>\n\n\n\n
          \u4f7f\u7528 c:url \u6a19\u7c64\u6709\u4ee5\u4e0b\u512a\u9ede\uff1a<\/p>\n\n\n\n
            \n
          1. \u65b9\u4fbf\u6027\uff1ac:url \u6a19\u7c64\u53ef\u4ee5\u5728 JSP \u9801\u9762\u4e2d\u751f\u6210 URL\uff0c\u907f\u514d\u4e86\u624b\u52d5\u62fc\u63a5 URL \u7684\u7e41\u96dc\u5de5\u4f5c\u3002<\/li>\n\n\n\n
          2. \u53ef\u8b80\u6027\uff1a\u4f7f\u7528 c:url \u6a19\u7c64\u53ef\u4ee5\u4f7f\u4ee3\u78bc\u66f4\u6613\u8b80\uff0c\u5f9e\u800c\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u7dad\u8b77\u6027\u3002<\/li>\n\n\n\n
          3. \u53ef\u7dad\u8b77\u6027\uff1a\u4f7f\u7528 c:url \u6a19\u7c64\u53ef\u4ee5\u65b9\u4fbf\u5730\u66f4\u6539 URL\uff0c\u5f9e\u800c\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u7dad\u8b77\u6027\u3002<\/li>\n\n\n\n
          4. \u5b89\u5168\u6027\uff1ac:url \u6a19\u7c64\u652f\u6301\u5c0d URL \u9032\u884c\u7de8\u78bc\uff0c\u4ee5\u9632\u6b62 URL \u4e2d\u7684\u7279\u6b8a\u5b57\u7b26\u5c0d\u61c9\u7528\u7a0b\u5e8f\u9020\u6210\u5b89\u5168\u554f\u984c\u3002<\/li>\n<\/ol>\n\n\n\n
            \u7e3d\u7684\u4f86\u8aaa\uff0c\u4f7f\u7528 c:url \u6a19\u7c64\u53ef\u4ee5\u8b93\u4f60\u7684 JSP \u9801\u9762\u66f4\u65b9\u4fbf\u3001\u6613\u8b80\u3001\u6613\u7dad\u8b77\u3001\u5b89\u5168\u3002<\/p>\n\n\n\n
            \u5982\u679c\u4f60\u662f JSP \u958b\u767c\u8005\uff0c\u5efa\u8b70\u4f60\u4f7f\u7528 c:url \u6a19\u7c64\u4f86\u751f\u6210 URL\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
            JSTL\uff08JSP Standard Tag Library\uff09\u662f\u4e00\u7a2e\u91dd\u5c0d JSP\uff08JavaServer Pages\uff09\u7684\u6a19\u7c64\u5eab\uff0c\u63d0\u4f9b\u4e86\u8a31\u591a\u5e38\u7528\u7684\u6a19\u7c64\uff0c\u53ef\u4ee5\u7c21\u5316 JSP \u9801\u9762\u7684\u958b\u767c\u3002\u4f7f\u7528 JSTL \u53ef\u4ee5\u6e1b\u5c11 JSP \u9801\u9762\u4ee3\u78bc\u7684\u5197\u9577\uff0c\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002\u5982\u679c\u60a8\u662f JSP \u958b\u767c\u8005\uff0c\u5efa\u8b70\u60a8\u5b78\u7fd2\u548c\u4f7f\u7528 JSTL<\/p>\n","protected":false},"author":1,"featured_media":743,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[320,145,1],"tags":[443,452,448,449,450,451,453,445,444,446,365,447],"aioseo_notices":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/i0.wp.com\/hsin-life.com\/wp-content\/uploads\/2021\/07\/da18cf6e-a674-4d0c-9357-c02f3a814d02.png?fit=1280%2C675&ssl=1","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/posts\/2488"}],"collection":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/comments?post=2488"}],"version-history":[{"count":0,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/posts\/2488\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/media\/743"}],"wp:attachment":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/media?parent=2488"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/categories?post=2488"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/tags?post=2488"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}