我無法使用jstl打印或從hashmap的ArrayList中獲取數據。我想顯示詳細信息,例如bug_id,創建日期,摘要,每個表中存在的數組錯誤的白板。下面是jsp和servlet代碼。請建議修復。無法使用JSTL迭代hashmap的ArrayList列表
回到Home.jsp: -
<form action="IncomingBugs">
<table class="ui single line table">
<thead>
<tr>
<th>Bug Id</th>
<th>Creation Date</th>
<th>Summary</th>
<th>Whiteboard</th>
</tr>
</thead>
<tbody>
<c:forEach var="row" items="${list}">
<tr>
<td><c:out value="${row.bug_id}"/></td>
<td><c:out value="${row.creation_ts}"/></td>
<td><c:out value="${row.short_desc}"/></td>
<td><c:out value="${row.status_whiteboard}"/></td>
</tr>
</c:forEach>
</tbody>
</table>
</form>
IncomingBugs.jsp: -
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
OracleConnection oc=new OracleConnection();
try {
ArrayList<HashMap<String, Object>> bugList=oc.getbugList(null);
ArrayList<HashMap<String, String>> blr=new ArrayList<HashMap<String, String>>();
for (HashMap<String, Object> bugMap : bugList)
{
HashMap<String,String> bl=new HashMap<String, String>();
String bugzilla_id = bugMap.get("bug_id").toString();
String creation_ts = bugMap.get("creation_ts").toString();
String short_desc = bugMap.get("short_desc").toString();
String status_whiteboard=bugMap.get("status_whiteboard").toString();
bl.put("bug_id", bugzilla_id);
bl.put("creation_ts", creation_ts);
bl.put("short_desc", short_desc);
bl.put("status_whiteboard", status_whiteboard);
blr.add(bl);
}
request.setAttribute("list",blr);
RequestDispatcher dispatcher = request.getRequestDispatcher("/home.jsp");
dispatcher.forward(request, response);
}
下面是我想要的表格打印的Java代碼示例: -
ArrayList<HashMap<String, Object>> bugList = (ArrayList<HashMap<String, Object>>)request.getAttribute("list");
for (HashMap<String, Object> bugMap : bugList)
{
String bugzilla_id = bugMap.get("bug_id").toString();
String creation_ts = bugMap.get("creation_ts").toString();
String summary = bugMap.get("summary").toString();
String status_whiteboard=bugMap.get("status_whiteboard").toString();
out.println("<tr>");
out.println("<td>"+bugzilla_id+"</td>");
out.println("<td>"+creation_ts+"</td>");
out.println("<td>"+summary+"</td>");
out.println("<td>"+status_whiteboard+"</td>");
out.println("</tr>");
}
你得到一個錯誤信息?或者你期望什麼,並且不能使用這些代碼? *建議修復*不是問題。 –
我沒有收到任何錯誤。我想在表格中打印bug_id,creation_ts,summary,status_whiteboard。我曾嘗試在jsp中使用java,但仍然不工作https://stackoverflow.com/questions/46042030/http-status-500-unable-to-fetch-details-from-hashmap-to-jsp –
不是JSP EL檢查範圍?已經很長時間了,但是你正在設置一個請求*屬性*。 –