也谈一下文件上传

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在这里看到很多讨论文件上传的文章,觉得各有利敝,有些只限于上传文件,而不能同时取得文本字段值,尤其是上传多个文件比较少,现本人做这个上传文件的类最多可支持上传255个文件,同时可取得文本字段值,请各位高手指正.

文件上传类:MoqUploadBean.java

package net.moq.www;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 MoqUploadBean {  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 MoqUploadBean() {  }  //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");  }}

文件上传调用:MoqUpload.jsp

〈%@ page contentType="text/html; charset=GB2312" %>〈html>〈head>〈title>文件上载〈/title>〈/head>〈body>〈form action="MoqUploadSubmit.jsp" enctype="MULTIPART/FORM-DATA" method="post">作者姓名:〈input type="text" name="Author" />〈br />公司名称:〈input type="text" name="Company" />〈br />文件描述:〈input type="text" name="Comment" />〈br />选择文件1:〈input type="file" name="filename1" />〈br />选择文件2:〈input type="file" name="filename2" />〈br />选择文件3:〈input type="file" name="filename3" />〈br />选择文件4:〈input type="file" name="filename4" />〈br />〈input type="submit" value="上载" />〈/form>〈/body>〈/html>

文件上传提交:MoqUploadSubmit.jsp

〈%@ page contentType="text/html;charset=gb2312"%>〈jsp:useBean id="fileBean" scope="page" class="net.moq.www.MoqUploadBean" />〈%fileBean.setObjectPath("D:/Temp/");fileBean.setSize(10000*1024);fileBean.setSuffix(".gif.jpg.png.jpge.html.htm");fileBean.setSourceFile(request);String [] saSourceFile = fileBean.getSourceFile();String [] saObjectFile = fileBean.getObjectFileName();String [] saDescription = fileBean.getDescription();int iCount = fileBean.getCount();String sObjectPath = fileBean.getObjectPath();for(int i=0;i〈iCount;i++) {  out.println("〈br>源始文件:");  out.println(saSourceFile[i]);  out.println("〈br>目标文件:");  out.println(sObjectPath+saObjectFile[i]);  out.println("〈br>上传说明:");  out.println(saDescription[i]);  out.println("〈br>");}out.println("〈br>作者:" + fileBean.getFieldValue("Author"));out.println("〈br>公司:" + fileBean.getFieldValue("Company"));out.println("〈br>说明:" + fileBean.getFieldValue("Comment"));%>