<%@ taglib prefix=\"c\" uri=\"http:\/\/java.sun.com\/jsp\/jstl\/core\" %>\n<%--\n Created by IntelliJ IDEA.\n User: ZRich\n Date: 2022\/12\/8\n Time: \u4e0b\u5348 5:26\n To change this template use File | Settings | File Templates.\n--%>\n<%@ page contentType=\"text\/html;charset=UTF-8\" language=\"java\" %>\n<html>\n<head>\n <title>Title<\/title>\n<\/head>\n<body>\n<%--JSTL \u6807\u7b7e\u5e93--%>\n<%--JSTL \u6807\u7b7e\u5e93 \u5168\u79f0\u662f\u6307 JSP Standard Tag Library JSP \u6807\u51c6\u6807\u7b7e\u5e93\u3002\u662f\u4e00\u4e2a\u4e0d\u65ad\u5b8c\u5584\u7684\u5f00\u653e\u6e90\u4ee3\u7801\u7684 JSP \u6807\u7b7e\u5e93\u3002--%>\n<%--EL \u8868\u8fbe\u5f0f\u4e3b\u8981\u662f\u4e3a\u4e86\u66ff\u6362 jsp \u4e2d\u7684\u8868\u8fbe\u5f0f\u811a\u672c\uff0c\u800c\u6807\u7b7e\u5e93\u5219\u662f\u4e3a\u4e86\u66ff\u6362\u4ee3\u7801\u811a\u672c\u3002\u8fd9\u6837\u4f7f\u5f97\u6574\u4e2a jsp \u9875\u9762\u53d8\u5f97\u66f4\u4f73\u7b80\u6d01\u3002--%>\n\n<%--JSTL 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\u6307\u4ee4\u5f15\u5165\u6807\u7b7e\u5e93\u3002--%>\n\n<%--\n Servlet 10 \u9700\u8981\u989d\u5916\u5bfc\u5165\u5982\u4e0b\u4e24\u4e2a\u5305 \u5426\u5219jsp\u9875\u9762\u4f1a\u62a5\u9519\n jakarta.servlet.jsp.jstl-2.0.0.jar\n jakarta.servlet.jsp.jstl-api-2.0.0.jar\n--%>\n\n<%-- <c:forEach end=\"\"><\/c:forEach>--%>\n\n<%--core \u6838\u5fc3\u5e93\u4f7f\u7528--%>\n\n <%--\n i.<c:set \/>\n \u4f5c\u7528\uff1aset \u6807\u7b7e\u53ef\u4ee5\u5f80\u57df\u4e2d\u4fdd\u5b58\u6570\u636e\n\n \u57df\u5bf9\u8c61.setAttribute(key,value);\n scope \u5c5e\u6027\u8bbe\u7f6e\u4fdd\u5b58\u5230\u54ea\u4e2a\u57df\n page \u8868\u793a PageContext \u57df\uff08\u9ed8\u8ba4\u503c\uff09\n request \u8868\u793a Request \u57df\n session \u8868\u793a Session \u57df\n application \u8868\u793a ServletContext \u57df\n var \u5c5e\u6027\u8bbe\u7f6e key \u662f\u591a\u5c11\n value \u5c5e\u6027\u8bbe\u7f6e\u503c\n --%>\n \u4fdd\u5b58\u4e4b\u524d\uff1a${requestScope.abc} <br\/>\n <c:set scope=\"request\" var=\"abc\" value=\"abcValue\"\/>\n \u4fdd\u5b58\u4e4b\u540e\uff1a${requestScope.abc} <br\/>\n <hr\/>\n\n <%--\n ii.<c:if \/>\n if \u6807\u7b7e\u7528\u6765\u505a if \u5224\u65ad\u3002\n test \u5c5e\u6027\u8868\u793a\u5224\u65ad\u7684\u6761\u4ef6\uff08\u4f7f\u7528 EL \u8868\u8fbe\u5f0f\u8f93\u51fa\uff09\n --%>\n <c:if test=\"${12 == 12}\">\n <h1>12\u7b49\u4e8e12<\/h1>\n <\/c:if>\n <c:if test=\"${12 != 12}\">\n <h1>12\u7b49\u4e8e12<\/h1>\n <\/c:if>\n <hr\/>\n\n\n <%--\n iii.<c:choose> <c:when> <c:otherwise>\u6807\u7b7e\n \u4f5c\u7528\uff1a\u591a\u8def\u5224\u65ad\u3002\u8ddf switch ... case .... default \u975e\u5e38\u63a5\u8fd1\n\n choose \u6807\u7b7e\u5f00\u59cb\u9009\u62e9\u5224\u65ad\n when \u6807\u7b7e\u8868\u793a\u6bcf\u4e00\u79cd\u5224\u65ad\u60c5\u51b5\n test \u5c5e\u6027\u8868\u793a\u5f53\u524d\u8fd9\u79cd\u5224\u65ad\u60c5\u51b5\u7684\u503c\n otherwise \u6807\u7b7e\u8868\u793a\u5269\u4e0b\u7684\u60c5\u51b5\n\n <c:choose> <c:when> <c:otherwise>\u6807\u7b7e\u4f7f\u7528\u65f6\u9700\u8981\u6ce8\u610f\u7684\u70b9\uff1a\n 1\u3001\u6807\u7b7e\u91cc\u4e0d\u80fd\u4f7f\u7528 html \u6ce8\u91ca\uff0c\u8981\u4f7f\u7528 jsp \u6ce8\u91ca\n 2\u3001when \u6807\u7b7e\u7684\u7236\u6807\u7b7e\u4e00\u5b9a\u8981\u662f choose \u6807\u7b7e\n --%>\n <%\n request.setAttribute(\"height\",178);\n %>\n <c:choose>\n <%-- \u8fd9\u662fhtml\u6ce8\u91ca --%>\n <c:when test=\"${requestScope.height > 190}\">\n <h2>\u5c0f\u5de8\u4eba<\/h2>\n <\/c:when>\n <c:when test=\"${requestScope.height > 180}\">\n <h2>\u5f88\u9ad8<\/h2>\n <\/c:when>\n <c:when test=\"${requestScope.height > 170}\">\n <h2>\u8fd8\u53ef\u4ee5<\/h2>\n <\/c:when>\n <c:otherwise>\n <c:choose>\n <c:when test=\"${requestScope.height > 160}\">\n <h2>\u5927\u4e8e160<\/h2>\n <\/c:when>\n <c:when test=\"${requestScope.height > 150}\">\n <h2>\u5927\u4e8e 150<\/h2>\n <\/c:when>\n <c:when test=\"${requestScope.height > 140}\">\n <h2>\u5927\u4e8e 140<\/h2>\n <\/c:when>\n <c:otherwise>\n \u5176\u4ed6\u5c0f\u4e8e140\n <\/c:otherwise>\n <\/c:choose>\n <\/c:otherwise>\n <\/c:choose>\n\n\n<\/body>\n<\/html>\n<\/code><\/pre>\n\n\n\nJSTL\u6807\u7b7e\u5e93-\u4f7f\u7528forEach\u904d\u53861\u523010\u7684\u60c5\u51b5\u3001JSTL\u6807\u7b7e\u5e93-\u4f7f\u7528forEach\u904d\u5386Object\u6570\u7ec4\u3001JSTL\u6807\u7b7e\u5e93-\u4f7f\u7528forEach\u904d\u5386Map\u96c6\u5408\u3001JSTL\u6807\u7b7e\u5e93-\u4f7f\u7528forEach\u904d\u5386List\u96c6\u5408<\/p>\n\n\n\n
<%@ page import=\"top.qaqaq.P211.Student\" %>\n<%@ page import=\"java.util.*\" %>\n<%@ taglib prefix=\"c\" uri=\"http:\/\/java.sun.com\/jsp\/jstl\/core\" %>\n<%--\n Created by IntelliJ IDEA.\n User: ZRich\n Date: 2022\/12\/8\n Time: \u4e0b\u5348 7:20\n To change this template use File | Settings | File Templates.\n--%>\n<%@ page contentType=\"text\/html;charset=UTF-8\" language=\"java\" %>\n<html>\n<head>\n <title>Title<\/title>\n <style>\n table{\n border: 1px blue solid;\n width: 600px;\n border-collapse: collapse;\n }\n td,th{\n border: 1px blue solid;\n }\n <\/style>\n<\/head>\n<body>\n<%--iv. <c:forEach \/>--%>\n\n <%--\n 1.\u904d\u5386 1 \u5230 10\uff0c\u8f93\u51fa\n begin \u5c5e\u6027\u8bbe\u7f6e\u5f00\u59cb\u7684\u7d22\u5f15\n end \u5c5e\u6027\u8bbe\u7f6e\u7ed3\u675f\u7684\u7d22\u5f15\n var \u5c5e\u6027\u8868\u793a\u5faa\u73af\u7684\u53d8\u91cf(\u4e5f\u662f\u5f53\u524d\u6b63\u5728\u904d\u5386\u5230\u7684\u6570\u636e)\n for (int i = 1; i < 10; i++)\n --%>\n <table>\n <c:forEach begin=\"1\" end=\"10\" var=\"i\">\n <tr>\n <td>\u7b2c${i}\u884c<\/td>\n <\/tr>\n <\/c:forEach>\n <\/table>\n <hr\/>\n\n <%--\n 2.\u904d\u5386 Object \u6570\u7ec4\n for (Object item: arr)\n items \u8868\u793a\u904d\u5386\u7684\u6570\u636e\u6e90\uff08\u904d\u5386\u7684\u96c6\u5408\uff09\n var \u8868\u793a\u5f53\u524d\u904d\u5386\u5230\u7684\u6570\u636e\n --%>\n <%\n request.setAttribute(\"arr\",new String[]{\"18610541354\",\"18688886666\",\"18699998888\"});\n %>\n <c:forEach items=\"${requestScope.arr}\" var=\"itme\">\n ${itme} <br\/>\n <\/c:forEach>\n <hr\/>\n\n <%--3.\u904d\u5386 Map \u96c6\u5408--%>\n <%\n Map<String,Object> map = new HashMap<String, Object>();\n map.put(\"key1\", \"value1\");\n map.put(\"key2\", \"value2\");\n map.put(\"key3\", \"value3\");\n\/\/ for (Map.Entry<String, Object> entry : map.entrySet()){\n\/\/\n\/\/ }\n request.setAttribute(\"map\",map);\n %>\n\n <c:forEach items=\"${requestScope.map}\" var=\"entry\">\n <h1>${entry.key} = ${entry.value}<\/h1>\n <\/c:forEach>\n\n<%--4. \u904d\u5386 List \u96c6\u5408---list \u4e2d\u5b58\u653e Student \u7c7b\uff0c\u6709\u5c5e\u6027\uff1a\u7f16\u53f7\uff0c\u7528\u6237\u540d\uff0c\u5bc6\u7801\uff0c\u5e74\u9f84\uff0c\u7535\u8bdd\u4fe1\u606f--%>\n <%\n List<Student> studentList = new ArrayList<Student>();\n for (int i = 1; i <= 10; i++) {\n studentList.add(new Student(i, \"username\" + i, \"password\" + i, 18 + i, \"phone\" + i));\n }\n request.setAttribute(\"stus\",studentList);\n %>\n <table>\n <tr>\n <th>\u7f16\u53f7<\/th>\n <th>\u7528\u6237\u540d<\/th>\n <th>\u5bc6\u7801<\/th>\n <th>\u5e74\u9f84<\/th>\n <th>\u7535\u8bdd<\/th>\n <th>\u64cd\u4f5c<\/th>\n <\/tr>\n <%--\n items \u8868\u793a\u904d\u5386\u7684\u96c6\u5408\n var \u8868\u793a\u904d\u5386\u5230\u7684\u6570\u636e\n begin \u8868\u793a\u904d\u5386\u7684\u5f00\u59cb\u7d22\u5f15\u503c\n end \u8868\u793a\u7ed3\u675f\u7684\u7d22\u5f15\u503c\n step \u5c5e\u6027\u8868\u793a\u904d\u5386\u7684\u6b65\u957f\u503c\n varStatus \u5c5e\u6027\u8868\u793a\u5f53\u524d\u904d\u5386\u5230\u7684\u6570\u636e\u7684\u72b6\u6001\n for\uff08int i = 1; i < 10; i+=2\uff09\n --%>\n <c:forEach begin=\"2\" end=\"7\" step=\"2\" varStatus=\"status\" items=\"${requestScope.stus}\" var=\"stu\">\n <tr>\n <td>${stu.id}<\/td>\n <td>${stu.username}<\/td>\n <td>${stu.password}<\/td>\n <td>${stu.age}<\/td>\n <td>${stu.phone}<\/td>\n <%--\n \u8bfb\u65b9\u6cd5\n getXxx\u6216isXxx\n --%>\n <td>${status.first}<\/td>\n <\/tr>\n <%--${stu} <br\/>--%>\n <\/c:forEach>\n <\/table>\n\n<\/body>\n<\/html>\n<\/code><\/pre>\n\n\n\nJSTL\u6807\u7b7e\u5e93-forEach\u6807\u7b7e\u6240\u6709\u5c5e\u6027\u7ec4\u5408\u4f7f\u7528\u4ecb\u7ecd<\/p>\n\n\n\n![\"\"](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
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![\"\"](\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-127.png\")
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