演示URL:http://192.168.0.222/english/product_0207_sec.jsp?pid=en_1-02
http://192.168.0.222/english/product_0207_sec.jsp?pid=en_999
在.jsp文件中,<try>
部分可以在同一个html页面中提取不同的数据,
如何使if else与<%@include file = .html>
一起工作
- 尝试.jsp,如果存在其他不同的包含文件(第55 - 62行)
<%@page contentType="text/html;charset=UTF-8" %>
<%@include file="/include/gds_include.jsp" %>
<jsp:useBean class="com.gds.DBconnect" id="dbHelper" scope="page" />
<%@include file="01_product_categories_detail.html"%>
<%
String id = request.getParameter("pid");
try {
dbHelper.setConnection(77);
dbHelper.setStatementIndex(0);
dbHelper.setPreparedStatement("select * from webpage where p_id = '"+id+"'");
dbHelper.exePreparedStatement();
resultSet = dbHelper.getSqlResultArray();
if(resultSet != null) {
for(int i=0; i<resultSet.length; i++) {
out.print("<tr><td>" );
out.print("<h1>" + resultSet[i][2] + "</h1>");
out.print( resultSet[i][6]);
}
}
}
catch(Exception ex) {
out.print("error message:" + ex);
}
finally {
dbHelper.doFinalize();
}
%>
</html>
<%@include file="02_product_categories_detail.html"%>
<%
String id = request.getParameter("pid");
if(pid != "en_1-01")
out.println(" <%@include file="footer_A.html"%> ");
else if (pid == "en_1-02")
out.println(" <%@include file="footer_B.html"%> ");
%>
为了使这个.jsp能够处理更多场景,请给予我一点帮助
- 更新尝试代码_02
<%@page contentType="text/html;charset=UTF-8" %>
<%@include file="/include/gds_include.jsp" %>
<jsp:useBean class="com.gds.DBconnect" id="dbHelper" scope="page" />
<%@include file="01_product_categories_detail.html"%>
<%
String id = request.getParameter("pid");
try {
dbHelper.setConnection(77);
dbHelper.setStatementIndex(0);
dbHelper.setPreparedStatement("select * from webpage where p_id = '"+id+"'");
dbHelper.exePreparedStatement();
resultSet = dbHelper.getSqlResultArray();
if(resultSet != null) {
for(int i=0; i<resultSet.length; i++) {
out.print("<tr><td>" );
out.print("<h1>" + resultSet[i][2] + "</h1>");
out.print( resultSet[i][6]);
}
}
}
catch(Exception ex) {
out.print("錯誤訊息:" + ex);
}
finally {
dbHelper.doFinalize();
}
%>
<%
String id = request.getParameter("pid");
if(!id.equals("en_1-01")) {
%>
<%@include file="02_product_categories_detail.html"%>
<%
} else if (id.equals("en_1-02")) {
%>
<%@include file="microchip_product_categories_detail.html"%>
<%
}
%>
</html>
- 错误讯息
Message Unable to compile class for JSP:
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: [58] in the jsp file: [/english/product_0207_sec.jsp]
Duplicate local variable id
55:
56:
57: <%
58: String id = request.getParameter("pid");
59:
60: if(!id.equals("en_1-01")) {
61: %>
Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:213)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:509)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:397)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:367)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:351)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:603)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:399)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328)
jakarta.servlet.http.HttpServlet.service(HttpServlet.java:777)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Note The full stack trace of the root cause is available in the server logs.
try { }
部分以前工作正常,所以错误发生在if else语句上(我猜)
1条答案
按热度按时间5fjcxozz1#
试试这个:
更新:
(1)移除
String id = request.getParameter("pid");
(2)字符串比较必须使用
equals
,而不是==
。