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List<HashMap<String,Object>> result = (List<HashMap<String,Object>>)request.getAttribute("result");

寫這段代碼得到了Unchecked cast from Object toHashMap

出現(xiàn)這個(gè)警告是因?yàn)檫M(jìn)行強(qiáng)制轉(zhuǎn)換的Object的類型沒有經(jīng)過確認(rèn)，所以這個(gè)類型轉(zhuǎn)換時(shí)不安全的。如果你確認(rèn)Object的類型與

HashMap的類型一致的話，可以加上在前面加上@SuppressWarnings("unchecked")來除掉這個(gè)警告

 <%
        @SuppressWarnings("unchecked")
     	List<HashMap<String,Object>> result = (List<HashMap<String,Object>>)request.getAttribute("result");
        for(Map<String,Object>row:result){ %>
        	 <tr>
        	      <td><%out.println(row.get("id")); %></td>
	              <td><%out.println(row.get("name")); %></td>
		      <td><%out.println(row.get("sex")); %></td>
		      <td><%out.println(row.get("blood")); %></td>
		      <td><%out.println(row.get("hobby")); %></td>
		      <td><%out.println(row.get("date")); %></td>
		      <td><%out.println(row.get("pic")); %></td>
             </tr>
       <% } %>