- 报错的:HTTP Status 500 -
type Exception report
message
description The server encountered an internal error that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
com.eshore.action.GoodServlet.doPost(GoodServlet.java:56)
com.eshore.action.GoodServlet.doGet(GoodServlet.java:26)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
com.eshore.filters.EncodeFilter.doFilter(EncodeFilter.java:45)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.30 logs.
Apache Tomcat/7.0.30
2.goodservlet代码
package com.eshore.action;
import java.io.IOException;
import java.util.Vector;
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.eshore.factory.DAOFactory;
import com.eshore.pojo.Goods;
/**
-
商品的Servlet类
*/
@WebServlet(
urlPatterns = { "/goods" },
name = "goodsServlet"
)
public class GoodServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//判断action类型
String action=request.getParameter("action");
String path=null;
Vector gVector=new Vector();try{ if(action.equals("index-select")){//查询商品列表 String keyWord=request.getParameter("keyWord");//获取查询的输入值 String keyClass=request.getParameter("keyClass");//获取查询类别 gVector=DAOFactory.getGoodDAOInstance().//获得所有商品 queryAll(keyWord, keyClass); request.setAttribute("goods", gVector); path="goods/goodslist.jsp"; }else if(action.equals("goodslist-select")){//指定商品列表 Goods good=new Goods(); String sid=request.getParameter("sid");//获得商品的id gVector=DAOFactory.getGoodDAOInstance().//获得指定的商品对象 queryGoodBySid(Integer.valueOf(sid)); if(gVector.size()>0&&gVector!=null) good =(Goods)gVector.get(0); request.setAttribute("good", good); path="goods/good.jsp"; } }catch(Exception e){ e.printStackTrace(); } request.getRequestDispatcher(path).forward(request, response);
}
}