日期:2014-05-16  浏览次数:20357 次

JSP上传文件(使用smartUpload)
1 使用smartUpload
<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ page import="com.jspsmart.upload.*"%>
<jsp:useBean id="mySmartUpload" scope="page"
	class="com.jspsmart.upload.SmartUpload" />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>使用smartUpload上传文件</title>
</head>
<body>
	<%
	try {
		//System.out.println(request.getInputStream());
		//System.out.println(mySmartUpload.getRequest().getParameter("bookName"));//都还没用组件解析怎么可能会有值
		mySmartUpload.initialize(pageContext);
		mySmartUpload.upload();//解析完毕
		System.out.println(mySmartUpload.getRequest().getParameter("bookName"));//可以取到一起提交的表单的附加值了
		mySmartUpload.save("F:/upload/");//项目根目录下的upload文件夹下  
		out.println("文件上传成功!");
	} catch (Exception e) {
		e.printStackTrace();
	}
%>
</body>
</html>


附件中的JAR包是支持中文名称的文件下载的
还有个是SMARTUPLOAD的源代码包

2 分析request的字节流
表单
<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>上传图片</title>
</head>
<body>
<form action="<%=request.getContextPath()%>/upload" method="post"
	enctype="multipart/form-data">
	<input type="text" name="haha" value="haha"/>
	<input type="file" name="image" />
<input type="submit" value="提交" /></form>
</body>
</html>


servlet
package org.dean.servlet;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringReader;
import java.util.Hashtable;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class UploadFileServlet
 */
public class UploadFileServlet extends HttpServlet {
	
	private static final long serialVersionUID = -6087978448595987514L;

	public void doPost(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		final int NONE = 0; // 状态码,表示没有特殊操作
		final int DATAHEADER = 1; // 表示下一行要读到报头信息
		final int FILEDATA = 2; // 表示下面要读的是上传文件和二进制数据
		final int FIELDDATA = 3; // 表示下面要读到表单域的文本值

		// 请求消息实体的总长度(请求消息中除消息头之外的数据长度)
		int totalbytes = req.getContentLength();

		// 容纳请求消息实体的字节数组
		byte[] b = new byte[totalbytes];
		// 请求消息类型
		String contentType = req.getContentType();

		String fieldname = ""; // 表单域的名称
		String fieldvalue = ""; // 表单域的值
		String filename = ""; // 上传的文件名称
		String boundary = ""; // 分界符字符串
		String lastboundary = ""; // 结束分界符字符串

		int fileSize = 0; // 文件长度

		// 容纳表单域的名称/值的哈希表
		Hashtable formfields = new Hashtable();

		// 在消息头类型中找到分界符的定义
		int pos = contentType.indexOf("boundary=");

		String fileID; // 上传的文件ID

		if (pos != -1) {
			pos += "boundary=".length();
			boundary = "--" + contentType.substring(pos); // 解析出分界符
			lastboundary = boundary + "--"; // 得到结束分界符
		}

		int state = NONE; // 起始状态为NONE

		// 得到请求消息的数据输入流
		DataInputStream in = new DataInputStream(req.getInputStream());
		in.readFully(b); // 根据长度,将消息实体的内容读入字节数组b中
		in.close(); // 关闭数据流
		String reqconte