painting中category的值为null

package com.imooc.mgallery.controller;

import java.io.File;

import java.io.IOException;

import java.util.List;

import java.util.UUID;

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 javax.sound.midi.Patch;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileItemFactory;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.imooc.mgallery.entity.Painting;

import com.imooc.mgallery.service.PaintingService;

import com.imooc.mgallery.utils.PageModel;

import javafx.scene.control.Alert;

/**

 * Servlet implementation class ManageController

 */

@WebServlet("/manage")

public class ManageController extends HttpServlet {

private PaintingService paintingService =new PaintingService();

private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public ManageController() {

        super();

        // TODO Auto-generated constructor stub

    }

/**

* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

*/

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

          //修改默认的post方式提交的字符集乱码问题  因为post调用了doget方法

  request.setCharacterEncoding("utf-8");

  //解决输出代码中文乱码问题

          response.setContentType("text/html;charset=utf-8");

          //如果实现一个servlet处理不同的功能呢   增删改查操作呢

          //每次访问servlet的时候携带一个method参数来判定你是什么请求

          String method =request.getParameter("method");

          //代表这还是list展示列表的请求

          //首先判断进来的list的参数是否为空

          if (method==null) {

System.out.println("输入method参数" );

  }

          if (method.equals("list")) {

this.list(request,response);

  }

          if (method.equals("delete")) {

  this.delete(request, response);

  }

          if (method.equals("update")) {

  }if (method.equals("show_create")) {

  this.showCreatePage(request,response);

}if (method.equals("create")) {

this.create(request,response);

}

}

private void create(HttpServletRequest request, HttpServletResponse response) {

    //因为这个新增是关于文件的提交 所以不能用传统的方式 request.getparam("param");

//因为默认entype是url字符串格式存储 而文件是二进制数据所以不能这样获取

//String  pname =request.getParameter("pname");  这里不行了 因为涉及文件的读取

   //System.out.println(pname);

//1初始化fileupload组件

//FileItemFactory用于将前端表单的数据转换为一个个fileItem对象

//servletFileUpload 则是 为FileUpload提供Java web的http请求解析

FileItemFactory  factory =new  DiskFileItemFactory(); //这是一个工厂 这里每一个涉及文件提交的表单数据都是一个FileItem文件对象

    ServletFileUpload sf =new ServletFileUpload(factory);

//2遍历所有FileItem文件

    try {

List<FileItem> list =sf.parseRequest(request);

Painting painting =new Painting();

for (FileItem fileItem : list) {

if (fileItem.isFormField()) {

System.out.println(fileItem.getFieldName()+":"+fileItem.getString());

switch (fileItem.getFieldName()) {

case "pname":

painting.setPname(fileItem.getString("utf-8"));

break;

case "category":

   painting.setCategroy(Integer.parseInt(fileItem.getString("utf-8")));

break;

case "price":

painting.setPrice(Integer.parseInt(fileItem.getString("utf-8")));

break;

case "description":

painting.setDescription(fileItem.getString("utf-8"));

break;

default:

break;

}

}else {

//3文件保存到服务器目录   确定这里是文件

String path =request.getServletContext().getRealPath("/upload");

System.out.println(path);

//避免文件名  写一个方法些不同的名字 使用随机数 或者当前时间作为文件名UUID

//扩展名也不是唯一的 通过获取原始文件的名字截取最后三位

//fileItem.getName()为了获取原始文件名字 只为了获取后三位文件扩展名

String suffix=fileItem.getName().substring(fileItem.getName().lastIndexOf("."));

String fileName=UUID.randomUUID().toString()+suffix;

fileItem.write(new File(path,fileName));

painting.setPriview("/upload"+fileName);

}

}

paintingService.create(painting);//新增功能处理

response.sendRedirect("/manage?method=list");//返回列表页展示 因为关联比较紧密 可以用重定向

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}  //对原有表单数据对象进行转换

}

private void showCreatePage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

request.getRequestDispatcher("WEB-INF/jsp/create.jsp").forward(request, response);

}

private void delete(HttpServletRequest request, HttpServletResponse response) {

// TODO Auto-generated method stub

}

/**

* 这里就是分页的代码

* @param request

* @param response

* @throws IOException 

* @throws ServletException 

*/

private void list(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String page =request.getParameter("p");

        String rows=request.getParameter("r");

        if (page ==  null) {

page="1";

}

        if (rows==null) {

rows="6";

}

       PageModel pageModel=  paintingService.getRawData(Integer.parseInt(page), Integer.parseInt(rows));

       request.setAttribute("pageModel", pageModel);

       List<Painting> list=pageModel.getPageData();

   request.getRequestDispatcher("WEB-INF/jsp/list.jsp").forward(request, response);

}

}

我获取的方式全部是一样的 打印出来categroy里面也有值 已提交就报错 说categroy为null 空指针异常

java.lang.NumberFormatException: null

at java.lang.Integer.parseInt(Integer.java:542)

at java.lang.Integer.parseInt(Integer.java:615)

at com.imooc.mgallery.utils.XmlDataSource.reload(XmlDataSource.java:77)

at com.imooc.mgallery.utils.XmlDataSource.append(XmlDataSource.java:129)

at com.imooc.mgallery.dao.PaintingDAO.create(PaintingDAO.java:32)

at com.imooc.mgallery.service.PaintingService.create(PaintingService.java:27)

at com.imooc.mgallery.controller.ManageController.create(ManageController.java:127)

at com.imooc.mgallery.controller.ManageController.doGet(ManageController.java:73)

at com.imooc.mgallery.controller.ManageController.doPost(ManageController.java:177)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:652)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:544)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)