servlet上传图片

package servlet;import java.io.File;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import java.util.List;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.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;/** * 文件上传 * @author Administrator * */public class UploadServlet extends HttpServlet {List piclist=new ArrayList();  //放上传的图片名 public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String path=request.getRealPath("/heads"); DiskFileItemFactory factory=new DiskFileItemFactory();ServletFileUpload sfu=new ServletFileUpload(factory);sfu.setHeaderEncoding("UTF-8");  //处理中文问题sfu.setSizeMax(1024*1024);//限制文件大小try {List<FileItem> fileItems= sfu.parseRequest(request);  //解码请求 得到所有表单元素for (FileItem fi : fileItems) {//有可能是 文件，也可能是普通文字 if (fi.isFormField()) { //这个选项是 文字 System.out.println("表单值为："+fi.getString());}else{// 是文件String fn=fi.getName();System.out.println("文件名是："+fn);  //文件名 // fn 是可能是这样的 c:\abc\de\tt\fish.jpgfi.write(new File(path,fn));if (fn.endsWith(".jpg")) {piclist.add(fn);  //把图片放入集合}}}} catch (Exception e) {e.printStackTrace();}//去显示上传的文件request.setAttribute("pics", piclist);request.getRequestDispatcher("show").forward(request, response); }public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// fix 修改过doGet(request, response);}/** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */public void init() throws ServletException {// Put your code here}}