how to iterate an ArrayList in JSP
Question
I create a JSP which call a java method and get an object ArrayList. I want to display the result in a table but nothing appeared. The jsp is like below:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ page import="SCOfetch.*" %>
<%@ page import="java.util.ArrayList" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>First Page</title>
<% JCOtest connection1 = new JCOtest(); %>
<%
ArrayList<CompanyRecord> list = new ArrayList<CompanyRecord>();
list = connection1.step4QueryTable();
%>
</head>
<body>
<c:forEach var="row" items="${list.rows}">
<tr>
<td><c:out value="${row.getValue(Name)}"/></td>
<td><c:out value="${row.getValue(Code)}"/></td>
</tr>
</c:forEach>
</body>
</html>
The java code of CompanyRecord class is
public class CompanyRecord {
private String Code;
private String Name;
public void setValue(String value,String column)
{
if (column.equals("Code"))
{
Code=value;
}
else
{
Name=value;
}
}
public String getValue(String column)
{
if (column.equals("Code"))
{
return Code;
}
else
{
return Name;
}
}
}
what's the correct way to call an ArrayList lineitem's method? Thanks.
1 answers
solution1
0 ACCPTED 2020-03-11 04:41:50
please find the below code for iterate ArrayList in JSP.
and please don't create the ArrayList in JSP.please create ArrayList and set before calling JSP from the servlet.
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ page import="SCOfetch.*" %>
<%@ page import="java.util.ArrayList" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>First Page</title>
<% JCOtest connection1 = new JCOtest(); %>
<%
ArrayList<CompanyRecord> list = new ArrayList<CompanyRecord>();
list = connection1.step4QueryTable();
%>
</head>
<body>
<c:forEach items="${list}" var="row">
<tr>
<td>${row.Name}</td> <!-- use variable name same like in DTO -->
<td>${row.Code}</td>
</tr>
</c:forEach>
</body>
</html>
AND please generate getter methods in CompanyRecord DTO class the only this code will work fine.
public class CompanyRecord {
private String Code;
private String Name;
public void setValue(String value,String column)
{
if (column.equals("Code"))
{
Code=value;
}
else
{
Name=value;
}
}
public String getValue(String column)
{
if (column.equals("Code"))
{
return Code;
}
else
{
return Name;
}
}
public String getCode()
{
return this.Code;
}
public String getName()
{
return this.Name;
}
}
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