在开发过程中用得比较多的上传组件是commons-fileupload和japSmartUpload,这两个组件都可以很好的完成文件上传的功能!
此例用commons-fileupload.这个组件在http://jakarta.apache.org/右边的搜索里面就能找到,顺带下载commons-io,commons-fileupload组件需要它的支持!将这两个组件的jar包放到项目的WEB-INF/lib文件夹,此时commons-fileupload组件的配置就算完成了!下面贴上源码....
上传文件(servlet)代码：
package com.rf.upload;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
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.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class UploadServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
// 判断提交过来的表单是否为文件上传菜单
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
// 上传文件
if (isMultipart) {
// 构造一个文件上传处理对象
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
// 迭代类
Iterator items;
try {
// 解析表单中提交的所有文件内容
items = upload.parseRequest(request).iterator();
while (items.hasNext()) {
FileItem item = (FileItem) items.next();
// 取出上传文件的文件名称
String name = item.getName();
// 取得上传文件以后的存储路径
String fileName = name.substring(
name.lastIndexOf('\\') + 1, name.length());
// 上传文件以后的存储路径(Tomact项目部署创建file文件)
String path = request.getRealPath("file")
+ File.separatorChar + fileName;
// 上传文件
File uploaderFile = new File(path);
item.write(uploaderFile);
// 打印上传成功信息
response.setContentType("text/html");
response.setCharacterEncoding("GB2312");
PrintWriter out = response.getWriter();
out.print("<font size='2'>上传文件为:" + name + "<br>保存的地址为"
+ path + "</font>");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
@Override
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(req, resp);
}
}
页面代码（jsp）：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<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>
<!-- enctype 默认是 application/x-www-form-urlencoded -->
<form action="FileUpload" enctype="multipart/form-data" method="post">
上传文件：
<input type="file" name="file1">
<br />
<input type="submit" value="提交" />
</form>
</body>
</html>
结果截图：
