一、應用背景 JSP取得Servlet中放入request的List，將List中的數據拼裝成XML。以下代碼在Eclipse的內置浏覽器中顯示為xml，沒有問題。 [java] /** * 新聞Servlet * @author 徐越 * */ public class ListServlet extends HttpServlet { private static final long serialVersionUID = 1L; private VideoNewsService vs = new VideoNewsServiceImpl(); protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { List<VideoNews> news = vs.readNews(); request.setAttribute("lstnews", news); request.getRequestDispatcher("/WEB-INF/pages/news.jsp").forward(request, response); } } /** * 新聞Servlet * @author 徐越 * */ public class ListServlet extends HttpServlet { private static final long serialVersionUID = 1L; private VideoNewsService vs = new VideoNewsServiceImpl(); protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { List<VideoNews> news = vs.readNews(); request.setAttribute("lstnews", news); request.getRequestDispatcher("/WEB-INF/pages/news.jsp").forward(request, response); } } [html] <%@ page language="java" contentType="text/xml; charset=utf-8" pageEncoding="utf-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <?xml version="1.0" encoding="UTF-8"?> <videoNews> <c:forEach items="${lstnews}" var="n"> <news id="${n.id }"> <title>${n.title }</title> <length>${n.timeLength }</length> </news> </c:forEach> </videoNews> <%@ page language="java" contentType="text/xml; charset=utf-8" pageEncoding="utf-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <?xml version="1.0" encoding="UTF-8"?> <videoNews> <c:forEach items="${lstnews}" var="n"> <news id="${n.id }"> <title>${n.title }</title> <length>${n.timeLength }</length> </news> </c:forEach> </videoNews> 二、發現問題 火狐中報錯：XML解析錯誤：XML 或文本聲明不在實體的開頭 chrome報錯：XML declaration allowed only at the start of the document 根據錯誤信息，可以知道XML聲明<?xml version="1.0" encoding="UTF-8"?>必須在文檔的開頭。 三、解決問題 將page、taglib、xml同時放在第一行即可，一個接一個的後面。雖然不好看，但是解決問題哦
