ServletFileUpload上传文件

<form method="post" action="uploadservlet" enctype="multipart/form-data"> <h3> 选择要上传的文件 </h3> <table id="tab"> <script type="text/javascript" src="morefile.js"> </script> </table> <input type="submit" value="上传文件"> </form>
function morefile() { var tab=document.getElementById("tab"); var tr=tab.insertRow(); var td=tr.insertCell(); td.innerHTML="选择文件"; td=tr.insertCell(); td.innerHTML="<input type='file' name='uploadfile'>"; td=tr.insertCell(); td.innerHTML="<a href='javascript:void(0);' onclick='morefile()'>更多</a>" } morefile();
import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import javax.servlet.ServletException; import javax.servlet.ServletRequest; 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.FileUploadBase; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class UploadServlet extends HttpServlet { private ServletFileUpload fileUploadupload() { DiskFileItemFactory factory = new DiskFileItemFactory(); factory.setSizeThreshold(4 * 1024); ServletFileUpload upload = new ServletFileUpload(factory); return upload; } private List<FileItem> getFileItems(HttpServletRequest request) throws FileUploadException { ServletFileUpload upload = fileUploadupload(); upload.setSizeMax(1000 * 1024 * 1024); return upload.parseRequest(request); } private String path(HttpServletRequest request, FileItem item) { String uploadPath = request.getRealPath("/upload"); String totalName = item.getName(); String name = "temp"; if (totalName != "") { name = totalName.substring(totalName.lastIndexOf("\\") + 1);; } else { name = "temp"; } return uploadPath + "/" + name; } private void upload(HttpServletRequest request) throws Exception { List<FileItem> itemList = null; try { itemList = getFileItems(request); } catch (FileUploadException e) { System.out.println(e.getLocalizedMessage()); } if (itemList == null) { return; } for (FileItem item : itemList) { String path = path(request, item); item.write(new File(path)); } } public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { upload(request); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }