Jsp实现form的file和text传递(multipart/form-data)

首先是form部分，因为要有<input type="file" />的类型，所以需要添加enctype="multipart/form-data"这一参数，实现大文件传递

表单部分

<form action="addHomework.jsp" method="post" enctype = "multipart/form-data">

	课程号： <input type="text" name="course_id" value="<%=course_id%>" /><br /><br />

	作业号： <input type="text" name="homework_id" value="<%=homework_id%>" /><br /><br />

	作业标题： <input type="text" name="homework_title"

		value="<%=homework_title%>" /><br /><br />

	作业描述： <input type="text"

		name="homework_description" value="<%=homework_description%>" /><br /><br />

	附件： <input type="file" name="detail_attach_file"

		value="<%=detail_attach_file%>" /><br /><br />

	DDL： <input

		type="date" name="ddl" value="<%=ddl%>"/><br /><br />

	<input type="submit"

		value="发布" name="postHomework"><br /><br />

	<%=hintToUser%>

</form>

Java部分

<%@ page import="java.util.*" %>

<%@ page import="java.util.Date" %>

<%@ page import="java.text.SimpleDateFormat" %>

<%@ include file="MySQLHelper.jsp"%>

<%@ page import="org.apache.commons.fileupload.FileItem" %>

<%@ page import="org.apache.commons.fileupload.disk.DiskFileItemFactory" %>

<%@ page import="org.apache.commons.fileupload.FileUploadException" %>

<%@ page import="org.apache.commons.fileupload.servlet.ServletFileUpload" %>

<%

	String method = request.getMethod();

	String course_id = "";

	String homework_id = "";

	String homework_title = "";

	String homework_description = "";

	String detail_attach_file = "";

	String post_date = "";

	String ddl = "";

	String hintToUser = "";

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

		DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();

		ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);

		try {

			List list = servletFileUpload.parseRequest(request);

			Iterator iterator = list.iterator();

			while (iterator.hasNext()) {

				FileItem item = (FileItem)iterator.next();

				if (item.isFormField()) { // judge if it is not the file field

					String name = item.getFieldName(); // get the form's child name

					if (name.equals("course_id"))

						course_id = item.getString("utf-8");

					else if (name.equals("homework_id"))

						homework_id = item.getString("utf-8");

					else if (name.equals("homework_title"))

						homework_title = item.getString("utf-8");

					else if (name.equals("homework_description"))

						homework_description = item.getString("utf-8");

					else if (name.equals("ddl"))

						ddl = item.getString("utf-8");

				} else { // else it is the file field

					String fName = item.getName();  // get the file name

					int i = fName.lastIndexOf("\\");// fix the bug in ie

					fName = fName.substring(i + 1, fName.length());

					String filepath = request.getRealPath("/") + "detail_attach";

					File path = new File(filepath);

					if (!path.isDirectory()) {

						path.mkdir();

					}

					detail_attach_file = path + "/" + fName;

					try {

						if (fName != "") {

							item.write(new File(detail_attach_file));

						}

					} catch (Exception e) {

						e.printStackTrace();

					}

				}

			}

		} catch (FileUploadException e) {

			e.printStackTrace();

		} catch (Exception e) {

			e.printStackTrace();

		}

		// do whatever you want below

		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		post_date = df.format(new Date());

		MySQLHelper.HomeworkPost homeworkPost = new MySQLHelper.HomeworkPost(course_id, homework_id,

				homework_title, homework_description, detail_attach_file, post_date, ddl);

		if(MySQLHelper.addHomework(homeworkPost)) {

			hintToUser = "成功发布作业";

		}

	}

%>

至此，完毕