Java 如何在JSP中迭代ArrayList_Java_Jsp_Arraylist

Java 如何在JSP中迭代ArrayList

java jsp

Java 如何在JSP中迭代ArrayList,java,jsp,arraylist,Java,Jsp,Arraylist,我创建了一个JSP，它调用java方法并获得一个对象ArrayList。我想在表格中显示结果，但没有显示任何内容。jsp如下所示： <%@ 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"%> <%@

我创建了一个JSP，它调用java方法并获得一个对象ArrayList。我想在表格中显示结果，但没有显示任何内容。jsp如下所示：

<%@ 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>

调用ArrayList lineitem方法的正确方法是什么？谢谢。

请查找以下JSP中迭代ArrayList的代码

请不要在JSP中创建ArrayList。请在从servlet调用JSP之前创建ArrayList并设置

<%@ 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>

在重定向到JSP之前，您应该在servlet中填充数据

ArrayList list

与

${list}

<%@ 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>

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;
 }

}