jsp填充对象数组

我不熟悉JSP并试图创建一个Web应用程序，我可以从mysql数据库中检索actor列表并将其填充到JSP页面中。jsp填充对象数组

我能够成功地从MySQL数据库检索男主角（名字，姓氏，actor_id），并在演员填充ArrayList对象，但无法填充同样在JSP页面，

这里是我的代码，

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
    pageEncoding="ISO-8859-1" import="com.dbconnect.Actor,java.util.*"%> 
<!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>All the actors from SAKILA database</title> 
</head> 
<body> 
Im in get actors.jspp 

<%ArrayList<Actor> acrs = (ArrayList<Actor>)request.getAttribute("actorslist");%> 
<c:forEach var="Actor" items="${acrs}"> 
    FirstName:<c:out value="${Actor.getFirstname()}"></c:out> 
</c:forEach> 

%> 

</body> 
</html> 

Servlet code 


package com.dbconnect; 

import java.io.IOException; 
import java.sql.SQLException; 
import java.util.ArrayList; 

import javax.servlet.RequestDispatcher; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

/** 
* Servlet implementation class actorservlet 
*/ 
public class actorservlet extends HttpServlet { 
    private static final long serialVersionUID = 1L; 

    /** 
    * @see HttpServlet#HttpServlet() 
    */ 
    public actorservlet() { 
     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 
    } 

    /** 
    * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 
    */ 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
     System.out.println("Im in actorsservlet"); 
     Actors acrs = new Actors(); 
     ArrayList<Actor> actorslist = null; 
     try { 
      actorslist = acrs.getactors(); 
     } catch (ClassNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (SQLException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     for (Actor ac:actorslist) 
      System.out.println(ac.firstname); 
     request.setAttribute("actorslist", actorslist); 
     RequestDispatcher dispatcher = request.getRequestDispatcher("getactors.jsp"); 
     //response.sendRedirect("getactors.jsp"); 
     dispatcher.forward(request, response); 
     return; 
    } 

} 

Actors.java 

package com.dbconnect; 

import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.util.ArrayList; 
import java.util.List; 

public class Actors { 
    List<Actor> ls = new ArrayList<Actor>(); 
    DbContext db = null; 
    Actors(){ 

     try { 
      this.db = new DbContext(); 
     } catch (ClassNotFoundException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (SQLException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 
    public ArrayList<Actor> getactors() throws ClassNotFoundException, 
      SQLException { 

     ResultSet rs = this.db.getrows(); 
     populateactorlist(rs); 
     return (ArrayList<Actor>) ls; 
    } 

    public void populateactorlist(ResultSet rs) throws SQLException { 
     while (rs.next()) { 
      Actor rc = new Actor(); 
      rc.setActor_id(rs.getInt("actor_id")); 
      rc.setFirstname(rs.getString("first_name")); 
      rc.setLastname(rs.getString("last_name")); 
      ls.add(rc); 
     } 
    } 


    } 

} 

Actor.java 
package com.dbconnect; 

public class Actor { 
    Integer actor_id = null; 
    String firstname = null; 
    String lastname = null; 

    public Integer getActor_id() { 
     return actor_id; 
    } 

    public void setActor_id(Integer actor_id) { 
     this.actor_id = actor_id; 
    } 

    public String getFirstname() { 
     return firstname; 
    } 

    public void setFirstname(String firstname) { 
     this.firstname = firstname; 
    } 

    public String getLastname() { 
     return lastname; 
    } 

    public void setLastname(String lastname) { 
     this.lastname = lastname; 
    } 

}

来源

2013-10-21 user1050619

你为什么要同时使用scriptlet和JSTL删除较低%>（笔误？）？坚持与jstl。 –

我不确定无关标签。试试这个：

<% ArrayList<Actor> acrs = (ArrayList<Actor>)request.getAttribute("actorslist"); %> 
<c:forEach var="Actor" items="${acrs}"> 
    FirstName:<c:out value="${Actor.getFirstname()}"/><br/> 
</c:forEach>

尤其

来源

2013-10-21 00:27:49 paulsm4

我得到这个错误 - org.apache.jasper.JasperException：/getactors.jsp(15,11）当没有指定默认名称空间时，函数getFirstname必须与前缀一起使用 – user1050619

jsp填充对象数组

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