第1个上传组件commons-fileupload
=============commons-fileupload ================
common-fileupload组件是apache的一个开源项目之一，可以从http://jakarta.apache.org/commons/fileupload/下载。该组件简单易用，可实现一次上传一个或多个文件，并可限制文件大小。
-下载后解压zip包，将commons-fileupload-1.1.1.jar,和commons-io-1.2.jar(这里我们用的是更新的版本，但是用法是一样的)复制到tomcat的webapps\你的webapp\WEB-INF\lib\下，如果目录不存在请自建目录。
新建一个servlet: FileUpload.java用于文件上传：
package com.drp.util.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.*;
import java.util.*;
import java.util.regex.*;
import java.io.*;
import org.apache.commons.fileupload.servlet.*;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
public class FileUpload extends HttpServlet {
private String uploadPath = ""; // 用于存放上传文件的目录
private File tempPath = new File("D:\\Tomcat 5.5\\webapps\\drp1.2\\tempimages\\"); // 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=GB18030");
PrintWriter out = res.getWriter();
System.out.println(req.getContentLength());
System.out.println(req.getContentType());
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
//允许设置内存中存储数据的门限，单位：字节
factory.setSizeThreshold(4096);
// the location for saving data that is larger than getSizeThreshold()
//如果文件大小大于SizeThreshold，则保存到临时目录
factory.setRepository(new File("D:\\Tomcat 5.5\\webapps\\drp1.2\\tempimages"));
ServletFileUpload upload = new ServletFileUpload(factory);
// maximum size before a FileUploadException will be thrown
//最大上传文件，单位：字节
upload.setSizeMax(1000000);
try {
List fileItems = upload.parseRequest(req);
// assume we know there are two files. The first file is a small
// text file, the second is unknown and is written to a file on
// the server
Iterator iter = fileItems.iterator();
// 正则匹配，过滤路径取文件名
String regExp = ".+\\\\(.+)$";
// 过滤掉的文件类型
String[] errorType = { ".exe", ".com", ".cgi", ".asp" };
Pattern p = Pattern.compile(regExp);
String itemNo = "";//文件存放路径
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
// 在下文中上传文件至数据库时，将对这里改写
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 {
this.uploadPath = this.getServletConfig().getInitParameter("upload_path");//的到web.xml中的配置文件用于保存上传文件，也可以在已开始定义的时候初始化，不过这样可以通过改动配置文件来改动存放路径，不用该代码，增加了灵活性。
}
}
web.xml中相应的配置如下：
<servlet>
<servlet-name>FileUpload</servlet-name>
<servlet-class>com.drp.util.servlet.FileUpload</servlet-class>//注意路径
<init-param>
<param-name>upload_path</param-name>
<param-value>D:\\Tomcat 5.5\\webapps\\drp1.2\\images\\item\\</param-value>//存放地址 </init-param>
</servlet>
<servlet-mapping>
<servlet-name>FileUpload</servlet-name>
<url-pattern>/servlet/FileUpload</url-pattern>
</servlet-mapping>
对应的请求文件：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>index.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
</head>
<body>
//注意action地址，还有enctype要写成multipart/form-data，和method="POST" <form name="uploadform" method="POST" action="./servlet/FileUpload" ENCTYPE="multipart/form-data">
<table border="1" width="450" cellpadding="4" cellspacing="2" bordercolor="#9BD7FF">
<tr><td width="100%" colspan="2">
文件1：<input name="x" size="40" type="file">
</td></tr>
<tr><td width="100%" colspan="2">
文件2：<input name="y" size="40" type="file">
</td></tr>
<tr><td width="100%" colspan="2">
文件3：<input name="z" size="40" type="file">
</td></tr>
</table>
<br/><br/>
<table>
<tr><td align="center"><input name="upload" type="submit" value="开始上传"/></td></tr>
</table>
</form>
</body>
</html>
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