uploadbean.java

实现jsp+javabean多文件上传代码

package com.emd;

import java.io.*;

import java.util.*;

import javax.servlet.*;

import javax.servlet.http.*;

/**
 * 
 * 
 * 
 * Title: 文件上传类
 * 
 * Description: 既能对文件进行上传,又能取得输入框的值,最多可同时上传255个文件
 * 
 * Copyright: Copyright (c) 2002
 * 
 * Company: Tekson
 * 
 * @author 莫琼
 * 
 * @version 1.0
 * 
 */

public class UpLoadBean {

	private String[] sourceFile = new String[255]; // 源文件名

	private String[] suffix = new String[255]; // 文件后缀名

	private String canSuffix = ".gif.jpg.jpeg.png"; // 可上传的文件后缀名

	private String objectPath = "c:/"; // 目标文件目录

	private String[] objectFileName = new String[255]; // 目标文件名

	private ServletInputStream sis = null; // 输入流

	private String[] description = new String[255]; // 描述状态

	private long size = 100 * 1024; // 限制大小

	private int count = 0; // 已传输文件数目

	private byte[] b = new byte[4096]; // 字节流存放数组

	private boolean successful = true;

	private Hashtable fields = new Hashtable();

	public UpLoadBean() {

	}

	// 设置上传文件的后缀名

	public void setSuffix(String canSuffix) {

		this.canSuffix = canSuffix;

	}

	// 设置文件保存路径

	public void setObjectPath(String objectPath) {

		this.objectPath = objectPath;

	}

	// 设置文件保存路径

	public void setSize(long maxSize) {

		this.size = maxSize;

	}

	// 文件上传处理程序

	public void setSourceFile(HttpServletRequest request) throws IOException {

		sis = request.getInputStream();

		int a = 0;

		int k = 0;

		String s = "";

		while ((a = sis.readLine(b, 0, b.length)) != -1) {

			s = new String(b, 0, a);

			if ((k = s.indexOf("filename=\"")) != -1) {

				// 取得文件数据

				s = s.substring(k + 10);

				k = s.indexOf("\"");

				s = s.substring(0, k);

				sourceFile[count] = s;

				k = s.lastIndexOf(".");

				suffix[count] = s.substring(k + 1);

				if (canTransfer(count)) {

					transferFile(count);

				}

				++count;

			} else if ((k = s.indexOf("name=\"")) != -1) {

				// 普通表单输入元素，获取输入元素名字

				String fieldName = s.substring(k + 6, s.length() - 3);

				sis.readLine(b, 0, b.length);

				StringBuffer fieldValue = new StringBuffer(b.length);

				while ((a = sis.readLine(b, 0, b.length)) != -1) {

					s = new String(b, 0, a - 2);

					if ((b[0] == 45) && (b[1] == 45) && (b[2] == 45)
							&& (b[3] == 45) && (b[4] == 45)) {

						break;

					} else {

						fieldValue.append(s);

					}

				}

				fields.put(fieldName, fieldValue.toString());

			}

			if (!successful)

				break;

		}

	}

	// 取得表单元素值

	public String getFieldValue(String fieldName) {

		if (fields == null || fieldName == null) {

			return null;

		}

		return (String) fields.get(fieldName);

	}

	// 取得上传文件数

	public int getCount() {

		return count;

	}

	// 取得目标路径

	public String getObjectPath() {

		return objectPath;

	}

	// 取得源文件名

	public String[] getSourceFile() {

		return sourceFile;

	}

	// 取得目标文件名

	public String[] getObjectFileName() {

		return objectFileName;

	}

	// 取得上传状态描述

	public String[] getDescription() {

		return description;

	}

	// 判断上传文件的类型

	private boolean canTransfer(int i) {

		suffix[i] = suffix[i].toLowerCase();

		// 这个是用来传图片的，各位可以把后缀名改掉或者不要这个条件

		if (sourceFile[i].equals("")
				|| (!(canSuffix.indexOf("." + suffix[i]) >= 0))) {

			description[i] = "ERR: File suffix is wrong.";

			return false;

		}

		else {

			return true;

		}

	}

	// 上传文件转换

	private void transferFile(int i) {

		String x = Long.toString(new java.util.Date().getTime());

		try {

			objectFileName[i] = x + "." + suffix[i];

			FileOutputStream out = new FileOutputStream(objectPath
					+ objectFileName[i]);

			int a = 0;

			int k = 0;

			long hastransfered = 0; // 标示已经传输的字节数

			String s = "";

			while ((a = sis.readLine(b, 0, b.length)) != -1) {

				s = new String(b, 0, a);

				if ((k = s.indexOf("Content-Type:")) != -1) {

					break;

				}

			}

			sis.readLine(b, 0, b.length);

			while ((a = sis.readLine(b, 0, b.length)) != -1) {

				s = new String(b, 0, a);

				if ((b[0] == 45) && (b[1] == 45) && (b[2] == 45)
						&& (b[3] == 45) && (b[4] == 45)) {

					break;

				}

				out.write(b, 0, a);

				hastransfered += a;

				if (hastransfered >= size) {

					description[count] = "ERR: The file " + sourceFile[count] +

					" is too large to transfer. The whole process is interrupted.";

					successful = false;

					break;

				}

			}

			if (successful) {

				description[count] = "Right: The file " + sourceFile[count] +

				" has been transfered successfully.";

			}

			out.close();

			if (!successful) {

				sis.close();

				File tmp = new File(objectPath + objectFileName[count]);

				tmp.delete();

			}

		}

		catch (IOException ioe) {

			description[i] = ioe.toString();

		}

	}

	public static void main(String[] args) {

		System.out.println("Test OK");

	}

}