先上结论（可能不对，因为这是根据实践猜测而来，欢迎指正）
表单改为multipart/form-data传值后，数据就不能通过普通的request.getParameter获取。
文件和文件名通过FileItem对象来获取，普通表单数据其实也包含在内。
先获取所有的items
List<FileItem> formItems = upload.parseRequest(request);
遍历items，Listz中包含表单中所有的input，按你jsp中form表单写的顺序放的
for (FileItem item : formItems)
循环中用到item的三个函数
item.isFormField()//判断本次遍历的item中是普通input控件的还是file控件，即判断type
item.getFieldName()//获取本次遍历的item中input控件的name值，用它结合if判断是否遍历到了自己想要的控件
item.getString()//获取本次遍历的item中input控件传来的值，参数填编码如item.getString("UTF-8")，取值的函数
好了，说完原理，上源码
<form action="Video_RegisterServlet" method="post" enctype="multipart/form-data">
<dl>
<dt>视频描述</dt>
<dd class="ipt_box">
<input id="usr" name="video_desc" type="text" placeholder="请输入视频描述" />
</dd>
</dl>
<dl>
<dt>所属课程</dt>
<dd class="ipt_box">
<input id="pwd" name="course_name" type="text" placeholder="所属课程" />
</dd>
</dl>
<dl>
<dt>文件</dt>
<dd class="ipt_box">
<input id="pwd" name="v_file" type="file" style="border:0px;"/>
</dd>
</dl>
<dl>
<dd class="ipt_reg_box">
<input class="regBtn" type="submit" value="上传" style="margin-left:40px;"/>
</dd>
</dl>
</form>
package com.lxz.servlet;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.lxz.dao.VideoDao;
import com.lxz.viso.Video;
/**
* Servlet implementation class Video_RegisterServlet
*/
public class Video_RegisterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String UPLOAD_DIRECTORY = "upload";
// 上传配置
private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB
private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
/**
* @see HttpServlet#HttpServlet()
*/
public Video_RegisterServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html; charset=UTF-8");
String video_desc = request.getParameter("video_desc");
String course_name = request.getParameter("course_name");//改了这里
if (!ServletFileUpload.isMultipartContent(request)) {
// 如果不是则停止
PrintWriter writer = response.getWriter();
writer.println("Error: 表单必须包含 enctype=multipart/form-data");
writer.flush();
return;
}
// 配置上传参数
DiskFileItemFactory factory = new DiskFileItemFactory();
// 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
factory.setSizeThreshold(MEMORY_THRESHOLD);
// 设置临时存储目录
factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
ServletFileUpload upload = new ServletFileUpload(factory);
// 设置最大文件上传值
upload.setFileSizeMax(MAX_FILE_SIZE);
// 设置最大请求值 (包含文件和表单数据)
upload.setSizeMax(MAX_REQUEST_SIZE);
// 中文处理
upload.setHeaderEncoding("UTF-8");
String uploadPath = getServletContext().getRealPath("/") + File.separator + UPLOAD_DIRECTORY;
// 如果目录不存在则创建
File uploadDir = new File(uploadPath);
if (!uploadDir.exists()) {
uploadDir.mkdir();
}
VideoDao videodao = new VideoDao();
Video video = new Video();
String filePath;
File storeFile;
try {
// 解析请求的内容提取文件数据
@SuppressWarnings("unchecked")
List<FileItem> formItems = upload.parseRequest(request);
if (formItems != null && formItems.size() > 0) {
// 迭代表单数据
for (FileItem item : formItems) {
// 处理不在表单中的字段
if(item.getFieldName().equals("video_desc"))//是否遍历到name=video_desc的input
video_desc = item.getString("UTF-8");//遍历到了，获取其值
if(item.getFieldName().equals("course_name"))
course_name = item.getString("UTF-8");
if (!item.isFormField()) {//前面有个感叹号
String fileName = new File(item.getName()).getName();
//检验是否存在相同文件名
video.setCourse_name(course_name);
video.setVideo_desc(video_desc);
video.setVideo_name(fileName);
//video.setVideo_path(uploadPath);
if(videodao.searchVideos(video))
{
request.setAttribute("msg", "已存在视频名称");
//已存在视频名称
}else{
videodao.addVideo(video);
filePath = uploadPath + File.separator + fileName;
storeFile = new File(filePath);
// 在控制台输出文件的上传路径
System.out.println(filePath);
// 保存文件到硬盘
item.write(storeFile);
request.setAttribute("msg","文件上传成功!");
}
}
}
}
} catch (Exception ex) {
request.setAttribute("msg","错误信息: " + ex.getMessage());
}
request.getRequestDispatcher("v_register.jsp").forward(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}