commons fileupload上传组件（完成图片上传）

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代码来自网络，稍作改动...

引入的jar包

commons-io-1.2.jar

commons-fileupload-1.1.1.jar

Servlet类

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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;


/**
 * 
 * @author Administrator
 * 
 */
public class FileUploadServlet extends HttpServlet {

	private String uploadPath = "D:\\addnetFile\\"; // 用于存放上传文件的目录
	private File tempPath = new File("D:\\addnetFile\\tmp\\"); // 用于存放临时文件的目录

	public void doPost(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		res.setContentType("text/html; charset=GB2312");
		PrintWriter out = res.getWriter();
		System.out.println(req.getContentLength());
		System.out.println(req.getContentType());
		DiskFileItemFactory factory = new DiskFileItemFactory();
		factory.setSizeThreshold(4096);
		factory.setRepository(new File("d:\\File\\addnetFile\\temp"));

		ServletFileUpload upload = new ServletFileUpload(factory);
		upload.setSizeMax(1000000);
		try {
			List fileItems = upload.parseRequest(req);
			Iterator iter = fileItems.iterator();

			// 正则匹配，过滤路径取文件名
			String regExp = ".+\\\\(.+){1}quot;;

			// 过滤掉的文件类型
			String[] errorType = { ".exe", ".com", ".cgi", ".asp" };
			Pattern p = Pattern.compile(regExp);
			while (iter.hasNext()) {
				FileItem item = (FileItem) iter.next();
				// 忽略其他不是文件域的所有表单信息
				if (!item.isFormField()) {
					String name = item.getName();
					long size = item.getSize();
					if ((name == null || name.equals("")) && size == 0)
						continue;
					Matcher m = p.matcher(name);
					boolean result = m.find();
					if (result) {
						for (int temp = 0; temp < errorType.length; temp++) {
							if (m.group(1).endsWith(errorType[temp])) {
								throw new IOException(name + ": wrong type");
							}
						}
						try {
							// 保存上传的文件到指定的目录
							item.write(new File("d:\\" + m.group(1)));

							out.print(name + "  " + size + "<br>");
						} catch (Exception e) {
							out.println(e);
						}
					} else {
						throw new IOException("fail to upload");
					}
				}
			}
		} catch (IOException e) {
			out.println(e);
		} catch (FileUploadException e) {
			out.println(e);
		}
	}

	public void init() throws ServletException {

	}
}

Web前端Html页

<html>
	<head>
		<title>物料维护</title>
		<link rel="stylesheet" href="../style/drp.css">
		<script src="../script/client_validate.js"></script>
		<script language="javascript">

</script>
	</head>

	<body class="body1">
		<form name="itemForm" target="_self" id="itemForm" method="post" enctype="multipart/form-data" action="../servlet/item/FileUploadServlet">
			<div align="center">
				<table width="95%" border="0" cellspacing="2" cellpadding="2">
					<tr>
						<td>
							 
						</td>
					</tr>
				</table>
				<table width="95%" border="0" cellspacing="0" cellpadding="0"
					height="8">
					<tr>
						<td width="522" class="p1" height="2" nowrap>
							<img src="../images/mark_arrow_03.gif" width="14" height="14">
							 
							<b>基础数据管理>>物料维护>>上传物料图片</b>
						</td>
					</tr>
				</table>
				<hr width="97%" align="center" size=0>
				<table width="95%" border="0" cellpadding="0" cellspacing="0">
					<tr>
						<td height="29">
							<div align="right">
								物料代码: 
							</div>
						</td>
						<td>
							 
						</td>
					</tr>
					<tr>
						<td height="26">
							<div align="right">
								物料名称: 
							</div>
						</td>
						<td>
							 
						</td>
					</tr>
					<tr>
						<td height="26">
							<div align="right">
								物料规格: 
							</div>
						</td>
						<td>
						
						</td>
					</tr>
					<tr>
						<td height="26">
							<div align="right">
								物料型号: 
							</div>
						</td>
						<td>
							 
						</td>
					</tr>
					<tr>
						<td height="26">
							<div align="right">
								类别: 
							</div>
						</td>
						<td>
							 
						</td>
					</tr>
					<tr>
						<td height="26">
							<div align="right">
								计量单位: 
							</div>
						</td>
						<td>
							 
						</td>
					</tr>
					<tr>
						<td height="74">
							<div align="right">
								图片: 
							</div>
						</td>
						<td>
							<img src="../images/about.gif" width="85" height="49">
						</td>
					</tr>
					<tr>
						<td width="22%" height="29">
							<div align="right">
								<font color="#FF0000">*</font>选择图片: 
							</div>
						</td>
						<td width="78%">
							<input name="fileName" type="file" class="text1" size="40" maxlength="40">
						</td>
					</tr>
				</table>
				<hr width="97%" align="center" size=0>
				<div align="center">
					<input name="btn_upload" class="button1" type="submit"
						id="btn_upload" value="上传">
					    
					<input name="btnBack" class="button1" type="button" id="btnBack"
						value="返回" onClick="history.go(-1)">
				</div>
			</div>
		</form>
	</body>
</html>

web.xml配置自己应该可以完成的吧，也可以选择向导，很简单的...

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