没有显示从servlet到jsp的数据，也没有错误 [英] not showing data from servlet to jsp , there is no error also

问题描述

stack trace:
--------------------------------------------------------------------------------------------
Mar 29, 2013 10:03:46 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/lib/jvm/java-6-openjdk-i386/jre/lib/i386/client:/usr/lib/jvm/java-6-openjdk-i386/jre/lib/i386:/usr/lib/jvm/java-6-openjdk-i386/jre/../lib/i386:/usr/lib/jvm/java-6-openjdk-i386/jre/lib/i386/client:/usr/lib/jvm/java-6-openjdk-i386/jre/lib/i386::/usr/java/packages/lib/i386:/usr/lib/i386-linux-gnu/jni:/lib/i386-linux-gnu:/usr/lib/i386-linux-gnu:/usr/lib/jni:/lib:/usr/lib
Mar 29, 2013 10:03:46 PM org.apache.coyote.AbstractProtocolHandler init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Mar 29, 2013 10:03:46 PM org.apache.coyote.AbstractProtocolHandler init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Mar 29, 2013 10:03:46 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 946 ms
Mar 29, 2013 10:03:46 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Mar 29, 2013 10:03:46 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.12
Mar 29, 2013 10:03:46 PM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor finalproject.xml from /home/ubuntu/tomcat/conf/Catalina/localhost
Mar 29, 2013 10:03:46 PM org.apache.catalina.startup.SetContextPropertiesRule begin
WARNING: [SetContextPropertiesRule]{Context} Setting property 'source' to 'org.eclipse.jst.jee.server:finalproject' did not find a matching property.
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory examples
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jstl/core_rt is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jstl/core is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jsp/jstl/core is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jstl/fmt_rt is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jstl/fmt is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jsp/jstl/fmt is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jsp/jstl/functions is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://jakarta.apache.org/taglibs/standard/permittedTaglibs is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://jakarta.apache.org/taglibs/standard/scriptfree is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jstl/sql_rt is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jstl/sql is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jsp/jstl/sql is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jstl/xml_rt is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jstl/xml is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.TaglibUriRule body
INFO: TLD skipped. URI: http://java.sun.com/jsp/jstl/xml is already defined
Mar 29, 2013 10:03:48 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Mar 29, 2013 10:03:48 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory ROOT
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory host-manager
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory manager
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory docs
Mar 29, 2013 10:03:48 PM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Mar 29, 2013 10:03:48 PM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Mar 29, 2013 10:03:48 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1877 m

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servlet：

____________

servlet:
____________

package finalpackage;

import java.util.*;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSetFormatter;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.util.FileManager;

/**
 * Servlet implementation class smartservlet
 */
@WebServlet("/smartservlet/")
//@webservlet(urlPatterns = {"/smartservlet/*"})
public class smartservlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public static final String MY_FOAF_FILE = "//home/ubuntu/indoor.rdf";

    /**
     * @see HttpServlet#HttpServlet()
     */
    public smartservlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doPost(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        // TODO Auto-generated method stub
        response.setContentType("text/html");
        // TODO Auto-generated method stub
        PrintWriter writer = response.getWriter();
        writer.println("<html>");
        writer.println("<head><title>checking Servlet</title></head>");
        writer.println("<body>check check ?</body>");
        writer.println("</html>");
            
        Model model = ModelFactory.createDefaultModel();            

        FileManager.get().readModel(model,MY_FOAF_FILE);
        model.read(new File(MY_FOAF_FILE).toURI().toString());
        String queryString =  "SELECT ?predicate ?object   WHERE {?subject ?predicate ?object .}";  

        com.hp.hpl.jena.query.Query query = QueryFactory.create(queryString);
        QueryExecution qe = QueryExecutionFactory.create(query, model);

        com.hp.hpl.jena.query.ResultSet results = qe.execSelect();
      
        ResultSetFormatter.out(System.out, results);

        List<rowobject> resultss = new ArrayList<rowobject>();

        while ( results.hasNext()) {
            System.out.println("check 1");
            RowObject result = new RowObject();
            QuerySolution binding = results.nextSolution();
            result.setName(binding.get("object").toString());
            resultss.add(result);
        }

        String dbs="ame";
        request.setAttribute("resultss", resultss); // Will be available as ${results} in JSP
        //  request.setAttribute("dbs", dbs); // Will be available as ${results} in JSP
        try {
            request.getRequestDispatcher("/wow.jsp").forward(request, response);

            //RequestDispatcher RequetsDispatcherObj =request.getRequestDispatcher("/wow.jsp");
            //RequetsDispatcherObj.forward(request, response);
        } catch (ServletException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch blockl
            e.printStackTrace();
        }
    }
}</pre?
jsp page  to show data from servlet:
-------------------------------
<pre lang="xml"><%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>

   <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
   <%@ page isELIgnored="false" %>
 <%@ page import="finalpackage.smartservlet" %>
<%@ page import="finalpackage.RowObject"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<table>
    <c:forEach items="${resultss}" var="rowObject">
        <tr>
        <td>${rowObject.getName()}</td>
        <td>${rowObject.getSymbol()}</td>
        <td>${rowObject.getNumber()}</td>

        </tr>
    </c:forEach>
</table>

</body>
</html>

推荐答案

{results}
// request.setAttribute（dbs，dbs）; //将在JSP中以

{results} in JSP // request.setAttribute("dbs", dbs); // Will be available as

{results}提供
尝试 {
request.getRequestDispatcher（ / wow.jsp）。forward（request，response）;

// RequestDispatcher RequetsDispatcherObj = request.getRequestDispatcher（/ wow.jsp）;
// RequetsDispatcherObj.forward（request，response）;
} catch （ServletException e）{
// TODO自动生成的捕获块
e.printStackTrace（）;
} catch （IOException e）{
// TODO自动生成的catch块
e.printStackTrace（）;
}
}
}< / pre？
jsp页面 显示来自servlet的数据：
--------------------------- ----
< pre lang = xml><％@ page language = java contentType = text / html; charset = ISO-8859-1
pageEncoding = ISO-8859-1\" ％GT;

<％@ taglib uri = http://java.sun.com/ jsp / jstl / core prefix = c％>
<％@ page isELIgnored = false％>
<％@ page import = finalpackage.smartservlet％>
<％@ page import = finalpackage.RowObject％>

<！DOCTYPE html PUBLIC - // W3C // DTD HTML 4.01 Transitional / / EN http://www.w3.org/TR/html4/loose.dtd >
< html>
< head>
< meta http-equiv = Content-Type content = text / html; charset = ISO-8859-1>
< title>在此处插入标题< / title>
< / head>
< body>
< table>
< c：forEach items =

{results} in JSP try { request.getRequestDispatcher("/wow.jsp").forward(request, response); //RequestDispatcher RequetsDispatcherObj =request.getRequestDispatcher("/wow.jsp"); //RequetsDispatcherObj.forward(request, response); } catch (ServletException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch blockl e.printStackTrace(); } } }</pre? jsp page to show data from servlet: ------------------------------- <pre lang="xml"><%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <%@ page isELIgnored="false" %> <%@ page import="finalpackage.smartservlet" %> <%@ page import="finalpackage.RowObject"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> </head> <body> <table> <c:forEach items="

{resultss} var = rowObject>
< tr>
< td>

{resultss}" var="rowObject"> <tr> <td>

这篇关于没有显示从servlet到jsp的数据，也没有错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！