如何在jsp頁面顯示集合

ContactManager.java

public class ContactManager extends HttpServlet { 
List<ContactDetails> contactsList = new ArrayList<ContactDetails>(); 


public List<ContactDetails> getContactsList() { 
    return contactsList; 
} 

public void setContactsList(List<ContactDetails> contactsList) { 
    this.contactsList = contactsList; 
} 

/** 
* 
*/ 
private static final long serialVersionUID = 7999998491377176969L; 

protected void doGet(HttpServletRequest request, 
     HttpServletResponse response) throws ServletException, IOException { 

    AssetDao assetDao = new AssetDao(); 
    contactsList = assetDao.loadAllContacts(); 

    response.setContentType("text/html"); 


    String nextJSP = "/searchResults.jsp"; 
    RequestDispatcher dispatcher = getServletContext() 
      .getRequestDispatcher(nextJSP); 
    dispatcher.forward(request, response); 

} 

protected void doPost(HttpServletRequest request, 
     HttpServletResponse response) throws ServletException, IOException { 

}

ContactDetails.java

public class ContactDetails { 

private String contactName; 

public String getContactName() { 
    return contactName; 
} 

public void setContactName(String contactName) { 
    this.contactName = contactName; 
}

}

searchResults.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
    pageEncoding="ISO-8859-1"%> 

<jsp:useBean class="com.ey.asset.servlet.ContactManager" 
scope="page" id="contactManager"> 
    </jsp:useBean> 

     <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 

    <html> 
    <head> 

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 
<title>Contacts manager</title> 

    </head> 
    <body> 
    Contacts List 

    <br><br> 

<table width="40%" cellpadding="5" bordercolor="#000066" 
    bgcolor="#FFFFFF" border="1" cellspacing="0"> 
    <tr> 


    <c:forEach var="conatctInfo" items="${contactManager.contactsList}"> 
     <td><div align="center"><b> <c:out value="${conatctInfo.contactName}"/> 
      </b></div></td> 
      </c:forEach> 

</tr> 
</table> 

</body> 
</html>

列表大小爲2 ..但其在serachResult.jsp

沒有顯示請幫助

來源

2011-03-09 jennifer

你似乎有一些拼寫錯誤：'conatctInfo'，而不是'contactInfo'。您的實際JSP是否一致？ – 2011-03-09 03:58:36

你正在創建的全新實例該servlet作爲jsp:useBean。這沒有意義。它與正在運行的servlet實例不是同一個實例。

在servlet中，擺脫

List<ContactDetails> contactsList = new ArrayList<ContactDetails>(); public List<ContactDetails> getContactsList() { return contactsList; } public void setContactsList(List<ContactDetails> contactsList) { this.contactsList = contactsList; }

並更換

contactsList = assetDao.loadAllContacts(); 
response.setContentType("text/html");

通過

List<ContactDetails> contactsList = assetDao.loadAllContacts(); 
request.setAttribute("contactsList", contactsList); // This sets ${contactsList}

在JSP中，擺脫的

<jsp:useBean class="com.ey.asset.servlet.ContactManager" 
scope="page" id="contactManager"> 
    </jsp:useBean>

並更換

<c:forEach var="conatctInfo" items="${contactManager.contactsList}">

通過

<c:forEach var="conatctInfo" items="${contactsList}">

（並修復錯誤）

來源

2011-03-09 04:02:47 BalusC

非常感謝。它的工作。 :) – jennifer 2011-03-09 04:16:00

不客氣。 – BalusC 2011-03-09 04:21:15

如何在jsp頁面顯示集合

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