jsp:include包含servlet

和Struts2的<s:action/>这个标签一样，<jsp:include>也是在页面中包含另外的页面或servlet，一般在页面一加载就显示后台数据时这两个标签比较实用。

首先是一个servlet：

public class LoadAllNewsController extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
            
            INewsService newsService = new NewsServiceImpl();
        
        try {
            List<News> newsList = newsService.getAll();//得到数据
            
            request.setAttribute("newsList", newsList);
        } catch (ServiceException e) {
            e.printStackTrace();
            
        }
        finally{
        
            newsService = null;
            //这里不再是跳转页面，而是include
            request.getRequestDispatcher("/WEB-INF/admin/loadAllNews.jsp").include(request, response);
        }
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        doGet(request, response);

    }

}

这个servlet要返回的页面：

<div class="row clearfix">
            <div class="col-md-12 column">
                <!-- 新闻列表 -->
                <c:choose>
                    <c:when test="${newsList != null && newsList.size() != 0 }">
                        <table class="table">
                            <thead>
                                <tr>
                                    <th>新闻标题</th>
                                    <th>发布时间</th>
                                    <th>城市</th>
                                    <th>分类</th>
                                    <th>编辑</th>
                                    <th>是否审核</th>
                                </tr>
                            </thead>
                            <tbody>
                                <c:forEach items="${newsList }" var="news">
                                    <c:choose>
                                        <c:when test="${news.examined == 0 }">
                                            <tr class="error">
                                        </c:when>
                                        <c:when test="${news.examined == 1 }">
                                            <tr class="success">
                                        </c:when>
                                    </c:choose>
                                        <td><a
                                            href="root/newsDescription?id=<c:out value="${news.id}"/>"><c:out
                                                    value="${news.title }"></c:out></a></td>
                                        <td><fmt:formatDate value="${news.publishTime }"
                                                pattern="yyyy年MM月dd日 HH:mm:SS" /></td>
                                        <td><c:out value="${news.city }"></c:out></td>
                                        <td><c:choose>
                                                <c:when test="${news.category == 1 }">社会</c:when>
                                                <c:when test="${news.category == 2 }">国际</c:when>
                                                <c:when test="${news.category == 3 }">军事</c:when>
                                                <c:when test="${news.category == 4 }">娱乐</c:when>
                                                <c:when test="${news.category == 5 }">时尚</c:when>
                                                <c:when test="${news.category == 6 }">科技</c:when>
                                                <c:when test="${news.category == 7 }">财经</c:when>
                                                <c:when test="${news.category == 8 }">体育</c:when>
                                                <c:when test="${news.category == 9 }">旅游</c:when>
                                                <c:when test="${news.category == 10 }">美食</c:when>
                                                <c:when test="${news.category == 11 }">汽车</c:when>
                                                <c:when test="${news.category == 12 }">教育</c:when>
                                                <c:when test="${news.category == 13 }">其他</c:when>
                                            </c:choose></td>
                                        <td><a
                                            href="root/listNewsByEditorId?id=<c:out value="${news.editorId }"/>"><c:out
                                                    value="${news.editor }"></c:out></a></td>
                                        <td><c:choose>
                                                <c:when test="${news.examined == 0 }">未审核</c:when>
                                                <c:otherwise>已审核</c:otherwise>
                                            </c:choose></td>
                                    </tr>
                                </c:forEach>
                            </tbody>
                        </table>
                    </c:when>
                    <c:otherwise>
                        <h3>没有新闻</h3>
                    </c:otherwise>
                </c:choose>
            </div>
        </div>

包含该servlet的页面index.jsp：

<div class="row clearfix">
            <div class="col-md-12 column">
                <jsp:include page="${basePath }/root/loadAllNews"></jsp:include>
                
            </div>
        </div>

这样在刷新index.jsp时加载servlet的数据。有时会报这个错：

org.apache.jasper.JasperException: /WEB-INF/admin/rootIndex.jsp (line: 83, column: 26) attribute for %>" is not properly terminated
    at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
    at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:443)
   。。。

我的原因是

<jsp:include page="${basePath }/root/loadAllNews"></jsp:include>

的servlet路径不正确，不要用<%=basePath>来加载路径，标签的page属性值可以是相对路径URL或者<%=表达式 %>，但同时只能存在其中一种

<jsp:include page="/frame/include.jsp"></jsp:include> 表示绝对路径

<jsp:include page="frame/include.jsp"></jsp:include> 表示相对路径

<jsp:include page="<%=uri %>"></jsp:include> 两个引号与<%=uri %>之间不能有空格