新闻发布项目——Servlet类（doNewsModifyServlet ）

package bdqn.newsManageServlet.Servlet;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.List;

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

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 bdqn.newsManageServlet.Dao.newsTbDao;
import bdqn.newsManageServlet.Dao.Impl.newsTbDaoImpl;
import bdqn.newsManageServlet.Service.categoryTBService;
import bdqn.newsManageServlet.Service.Impl.categoryTBServiceImpl;
import bdqn.newsManageServlet.entity.categoryTB;
import bdqn.newsManageServlet.entity.newsTb;

public class doNewsModifyServlet extends HttpServlet {

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		//获取相对应的值
		request.setCharacterEncoding("utf-8");
		//判断是文件还是不是文件
		newsTb news = new newsTb();
		String categoryName = "";//主题
		String title = "";//标题
		String author = "";//作者
		String summary = "";//摘要
		String content = "";//内容
		String picPath = "";//文件路径
		int id = 0;//类别id
		int newsid=0;//新闻的id
		boolean ismutipart=ServletFileUpload.isMultipartContent(request);
		if(ismutipart){
			//是文件
			//创建文件工厂
			FileItemFactory fac = new DiskFileItemFactory();
			//创建文件对象
			ServletFileUpload fileUpload = new ServletFileUpload(fac);
			//解析请求
			List<FileItem> fileItemlist;
			try {
				fileItemlist = fileUpload.parseRequest(request);
			
			//遍历结合，获取数据
			try {
		for (FileItem item : fileItemlist) {
			if (item.isFormField()) {
		//普通表单
		String fileName = item.getFieldName();
		//主题
		if (fileName.equals("slt")) {
			categoryName = item.getString("utf-8");
			categoryTBService cateService = new categoryTBServiceImpl();
			categoryTB cate = cateService
					.getCategoryIdByName(categoryName);
			//类别的id
			id = cate.getCategoryID();
		} else if (fileName.equals("title")) {
			//标题
			title = item.getString("utf-8");
		} else if (fileName.equals("author")) {
			//作者
			author = item.getString("utf-8");
		} else if (fileName.equals("summary")) {
			//摘要
			summary = item.getString("utf-8");
		} else if (fileName.equals("content")) {
			//内容
			content = item.getString("utf-8");
		}else if(fileName.equals("newsid")){
		//新闻的id
			newsid=Integer.parseInt(item.getString());
		}

			}else{
						//文件表单
						//文件表单
						//获取文件名全路径
						String fullfile = item.getName();
						File file1 = new File(fullfile);
						 //控制文件上传类型
						//通过Arrays类的aList（）方法创建固定长度的集合
						List<String> fileType = Arrays.asList("gif", "bmp",
								"jpg");
						String ext = fullfile.substring(fullfile
								.lastIndexOf(".") + 1);
						if (fileType.contains(ext)) { 
							//获取文件名，不包含文件路径
							String filename = file1.getName();
							ServletContext application=this.getServletContext();
							String uploadPath = application
									.getRealPath("adminManage/");
							File file2 = new File(uploadPath, filename);
							item.write(file2);
							picPath = file2.toString();
						 	//上传成功！
						} 
						else {
							request.setAttribute("mesg", "文件类型只能是图片类型");
							request.getRequestDispatcher("adminManage/modifyNews.jsp?newsid="+newsid+"")
									.forward(request, response);
							return;
						} 
					}
				}
			} catch (Exception ex) {
				ex.printStackTrace();
			}
			} catch (FileUploadException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		/* //根据类别名臣获取类别id
		String categoryName = request.getParameter("slt");
		categoryTBService cateService = new categoryTBServiceImpl();
		categoryTB cate = cateService.getCategoryIdByName(categoryName);
		//类别的id
		int id = cate.getCategoryID();
		//int id=Integer.parseInt(request.getParameter("cateId"));
		int newsid = Integer.parseInt(request.getParameter("newsid"));
		String title = request.getParameter("title");//标题
		String author = request.getParameter("author");//作者
		String summary = request.getParameter("summary");//摘要
		String content = request.getParameter("content");//内容
		String picPath = request.getParameter("picPath");//上传图片路径 */
		//将修改的信息添加到数据库中
		newsTbDao ndao = new newsTbDaoImpl();
		//将信息封装起来
		news.setCategoryID(id);
		news.setTitle(title);
		news.setSummary(summary);
		news.setContent(content);
		news.setAuthor(author);
		news.setPicPath(picPath);
		news.setNewsID(newsid);
		int rel = ndao.updateNewsTb(news);
		if (rel > 0) {
			out.print("<script>alert('修改成功！');location.href='adminManage/editNews.jsp';</script>");
		} else {
			request.setAttribute("msge", "修改失败！");
			request.getRequestDispatcher("adminManage/modifyNews.jsp").forward(request,
					response);
		}
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request, response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}