Note: Due to the long-term back-end code to write code that leads to the front quickly forgotten the basic. Summarize some again later for future use
to sum up:
1: jsp parameters and properties:
a) Parameters parameter: three sources:
i: web.xml or annotations provided
ii: url form submission and set
iii: Hyperlinks acquired
B): Attribute: four kinds of range, any optional type. In addition to the javabean property requires its own set manually.
i:page,request,session,Application
2: el usage:
A): Simple Type: Range Attribute
b) class instance: range. Property name. Field name
c): Array: $ {list [0] .name}
3:jstl：<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
In use the output jstl <c: out value = "el expression"> </ c: out>
<%@ page import="com.xm.workflow.entity.TestUser" %>
<%@ page import="net.sf.json.JSONArray" %>
<%@ page import="java.util.*" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%--
Created by IntelliJ IDEA.
User: 86156
Date: 2019/8/15
Time: 17:14
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String data = " [{\n" +
" \"id\": 839707,\n" +
" \"oldFileName\": \"体育-跑酷.png\",\n" +
" \"newFileName\": \"eca3b34c-8415-4915-ab9c-68749af6c3ad\",\n" +
" \"fileSize\": 1285,\n" +
" \"fileType\": \".png\",\n" +
" \"createTime\": \"2019-08-12 17:20:43.0\",\n" +
" \"swfNum\": 0,\n" +
" \"contractId\": 6653,\n" +
" \"createUser\": \"lixin5\",\n" +
" \"updateUser\": \"lixin5\",\n" +
" \"updateTime\": \"2019-08-12 17:20:43.0\",\n" +
" \"status\": 0,\n" +
" \"fileUrl\": \"http://api.miren.test.mi.com/ua/contractAttach?id\\u003d839707\\u0026newFileName\\u003deca3b34c-8415-4915-ab9c-68749af6c3ad\"\n" +
" }]";
JSONArray jsonArray = JSONArray.fromObject(data);
request.setAttribute("jsonArray", jsonArray);
int[] ages = {1, 2, 3, 4, 5}; // 普通数组，JSTL直接使用JSP赋值表达式来取
List<String> names = new LinkedList<String>(); // List
names.add("Biao");
names.add("彪");
names.add("雷");
request.setAttribute("names", names); // 添加到request
Map<String, String> map = new HashMap<String, String>(); // Map
map.put("1", "黄彪");
map.put("2", "丫头");
map.put("3", "哥哥");
map.put("4", "笨蛋");
List<TestUser> users = new ArrayList<TestUser>(); // JavaBean的List
users.add(new TestUser("黄彪", "xxxxxx"));
users.add(new TestUser("昊天", "xxxxxx"));
users.add(new TestUser("姐姐", "yyyyyy"));
users.add(new TestUser("丫头", "zzzzzz"));
session.setAttribute("users", users); // 添加到session
%>
<html>
<head>
<title>Title</title>
</head>
<body>
<table border="1">
<!--遍历数组-->
<tr>
<th>aaa</th>
<c:forEach items="<%=ages%>" var="age">
<th><c:out value="${age}"></c:out></th>
</c:forEach>
</tr>
<!--遍历list-->
<tr>
<c:forEach items="${names}" var="name">
<th><c:out value="${name}"></c:out></th>
</c:forEach>
</tr>
<!--遍历list2-->
<tr>
<c:forEach items="<%=names%>" var="name">
<th><c:out value="${name}"></c:out></th>
</c:forEach>
</tr>
</table>
<!--遍历map-->
<table border="1">
<tr>
<th>Key</th>
<th>Value</th>
</tr>
<c:forEach var="entry" items="<%= map %>">
<tr>
<td><c:out value="${entry.key}"/></td>
<td><c:out value="${entry.value}"/></td>
</tr>
</c:forEach>
</table>
<table border="1">
<tr>
<th>username</th>
<th>bz</th>
</tr>
<c:forEach items="${users}" var="user">
<tr>
<th><c:out value="${user.name}"></c:out></th>
<th><c:out value="${user.bz}"></c:out></th>
</tr>
</c:forEach>
</table>
<table border="1">
<c:forEach items="${jsonArray}" var="entrty">
<tr>
<th><c:out value="${entrty.id}"></c:out></th>
</tr>
<tr>
<th><c:out value="${entrty.oldFileName}"></c:out></th>
</tr>
<tr>
<th><c:out value="${entrty.newFileName}"></c:out></th>
</tr>
<tr>
<th><h1>http://jtest.mioffice.cn:8080/mibpm/client/contract/downloadAttachFile?id=+<c:out
value="${entrty.id}"></c:out>&uid=<c:out value="${entrty.newFileName}"></c:out></h1></th>
</tr>
<tr>
<th><a target="_blank" href="http://jtest.mioffice.cn:8080/mibpm/client/contract/downloadAttachFile?id=<c:out value="${entrty.id}"></c:out>&uid=+<c:out value="${entrty.newFileName}"></c:out>">点击链接</a>
</th>
</tr>
</c:forEach>
</table>
</body>
</html>
