commons-uploadFile上传文件实例

1.在web工程中引入两个jar文件：commons-fileupload-1.1.1.jar和commons-io-1.3.1.jar

2.创建一个servlet文件upload.java

upload.java code:

package myweb;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.*;
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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import myweb.DBConnection;
import java.sql.*;
import java.net.InetAddress;
import java.util.Calendar;

/**
 *
 * @author zhupan
 *
 */
public class upload extends HttpServlet {
    public upload() {
        try {
            jbInit();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /**
     *
     */
    private static final long serialVersionUID = 1L;

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        response.setContentType("text/html; charset=GB2312");
        PrintWriter out = response.getWriter();
        String type = request.getParameter("type"); //上传文件的类型
        try {
            DiskFileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload sevletFileUpload = new ServletFileUpload(factory);
            // 设置允许用户上传文件大小,单位:字节，这里设为2m
            //sevletFileUpload.setSizeMax(2 * 1024 * 1024);
            // 设置最多只允许在内存中存储的数据,单位:字节
            factory.setSizeThreshold(4096);
            // 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录
            factory.setRepository(new File("d://temp"));
            // 开始读取上传信息
            List fileItems = sevletFileUpload.parseRequest(request);
            // 依次处理每个上传的文件
            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;
            if (type.equals("1")) { //文本文件
                errorType = new String[] {".exe", ".com", ".cgi", ".ini",
                            ".sys",
                            ".bat", ".asp", ".jsp", ".jpg", ".gif",
                            ".bmp",
                            ".dll", ".html", ".htm", ".java", ".class", ".zip",
                            ".rar", ".avi", ".mp3", ".wmv", ".txt"};
                sevletFileUpload.setSizeMax(2 * 1024 * 1024);
            } else if (type.equals("2")) { //应用软件
                errorType = new String[] {".com", ".cgi", ".ini",
                            ".sys",
                            ".bat", ".asp", ".jsp", ".jpg", ".gif",
                            ".bmp",
                            ".dll", ".html", ".htm", ".java", ".class", ".avi",
                            ".mp3", ".wmv", ".doc", ".xls", ".txt", ".rtf",
                            ".txt"};
                sevletFileUpload.setSizeMax(20 * 1024 * 1024);
            } else if (type.equals("3")) { //音乐文件
                errorType = new String[] {".com", ".cgi", ".ini",
                            ".sys",
                            ".bat", ".asp", ".jsp", ".jpg", ".gif",
                            ".bmp",
                            ".dll", ".html", ".htm", ".java", ".class", ".doc",
                            ".xls", ".txt", ".rtf", ".rar", ".zip", ".txt"};
                sevletFileUpload.setSizeMax(10 * 1024 * 1024);
            } else { //
                errorType = new String[] {".exe", ".com", ".cgi", ".ini",
                            ".sys",
                            ".bat", ".asp", ".jsp", ".dll", ".html", ".htm",
                            ".java", ".class", ".txt"};
                sevletFileUpload.setSizeMax(5 * 1024 * 1024);
            }
            Pattern p = Pattern.compile(regExp);
            out.print("<html>");
            out.print("<head><title>上传提示页</title>");
            out.print(
                    "<link rel=stylesheet href=../css/treecss.css type=text/css></head>");
            out.print("<body bgcolor=#f7ffff>");
            out.print("<div align=center><table width=98% cellpadding=5 cellspacing=1><tr><td align=left class=td1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color=#2E75BB><b>上传文件提示</b></font></td></tr></table></div>");
            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])) {
                                out.print("");
                                out.print("");
                                throw new IOException(name + ": 非法文件类型禁止上传");
                            }
                        }
                        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，将对这里改写开始

                            out.print(
                                    "<div align=center><table width=98% cellpadding=5 cellspacing=1>");
                            out.print(
                                    "<tr><td align=left ><img src='../img/tp001.gif'>&nbsp;<b>上传成功</b></td></tr>");
                            out.print("<tr><td>文件名：" + name + "</td></tr>");
                            out.print("<tr><td>文件大小：" + size / 1024 +
                                      "KB</td></tr>");
                            out.print("<br>");
                            out.print("</table></div>");
                            Calendar c = Calendar.getInstance();
                            String n = c.toString().substring(33, 46);
                            String r = item.getName();
                            r = r.substring(r.lastIndexOf("."));
                            String a = n.concat(r);
                            if (type.equals("1")) { //表单
                                item.write(new File("d://myweb//E-gov//uploadfile//table//" +a));
                            } else if (type.equals("2")) {//应用软件
                                item.write(new File("d://myweb//E-gov//uploadfile//soft//" +a));
                            } else if (type.equals("3")) { //音乐
                                item.write(new File("d://myweb//E-gov//uploadfile//music//" +a));
                            } else {
                                item.write(new File("d://myweb//E-gov//uploadfile//temp//" +a));
                            }
                            String t_name = name.substring(name.lastIndexOf("//") + 1);
                            Connection con = null;
                            con = DBConnection.getConnection();
                            Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
                            if (type.equals("1")) { //表单
                                stmt.execute("insert into resource (table_name,ADDRESS,SIZE,DOWNLOAD_TIMES,type) values('" +t_name + "','" + a + "','" +size / 1024 + "',0,1)");
                            } else if (type.equals("2")) {
                                stmt.execute("insert into resource (table_name,ADDRESS,SIZE,DOWNLOAD_TIMES,type) values('" +t_name + "','" + a + "','" +size / 1024 + "',0,2)");
                            } else if (type.equals("3")) { //音乐
                                stmt.execute("insert into resource (table_name,ADDRESS,SIZE,DOWNLOAD_TIMES,type) values('" +t_name + "','" + a + "','" +size / 1024 + "',0,3)");
                            } else {
                                stmt.execute("insert into resource (table_name,ADDRESS,SIZE,DOWNLOAD_TIMES,type) values('" +t_name + "','" + a + "','" +size / 1024 + "',0,0)");
                            }
                            stmt.close();
                            con.close();

                            // 在下文中上传文件至目录时，将对这里改写结束
                        } catch (Exception e) {
                            out.println(e);
                        }
                    } else {
                        throw new IOException("fail to upload");
                    }
                }
            }
            out.print("</body></html>");
        } catch (IOException e) {
            out.println(e);
        } catch (FileUploadException e) {
            out.println(e);
        }
    }

    private void jbInit() throws Exception {
    }
}
3.html页面

<html>
  <head>
    <title>upload</title>
    <link  rel="stylesheet" href="../css/common.css" type="text/css"/>
    <script language=JavaScript type="">
      function fAddAttach(m){
        var gAttchHTML='<div class="tdtext"></div><div class="le"><input type="file" name="attachfile[]" class="box" size=40><input type="button" name="Submit" value="/u522a/u9664" class="box" id="btnDeleteReadAttach" /></div><span></span>';
        var Attach=document.getElementById("dvReadAttach"+m);
        var spnList=Attach.getElementsByTagName("SPAN");
        var spn=document.createElement("DIV");
        spn.className="qrc4";
        spn.innerHTML=gAttchHTML;
        spn.childNodes[1].childNodes[0].name="attachfile[]" + spnList.length;
        Attach.appendChild(spn);
        fGetObjInputById(spn,"btnDeleteReadAttach").onclick=function(){fDeleteAttach(this,m);};
        document.getElementById("aAddAttach"+m).innerHTML="继续添加";
        Attach.style.display="";
      }
      function fGetObjInputById(obj,id){
        var inputList=obj.getElementsByTagName("INPUT");
        for(var i=0;i<inputList.length;i++){
          if(inputList[i].id==id){
            return inputList[i];
          }
        }
        return null;
      }
      function fDeleteAttach(obj,m){
        try{
          obj.parentNode.parentNode.parentNode.removeChild(obj.parentNode.parentNode);
          var Attach=document.getElementById("dvReadAttach"+m);
          var spnList=Attach.getElementsByTagName("SPAN");
          if(spnList.length==0){
            document.getElementById("aAddAttach"+m).innerHTML="继续添加";
            Attach.style.display="none";
          }else{
            document.getElementById("aAddAttach"+m).innerHTML="继续添加";
          }
        }catch(exp){
        }
      }
      </script>
      </head>
      <body>
        <div align="center">
          <table width="98%" cellpadding="5" cellspacing="1">
            <tr><td align=left class="td1">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color=#2E75BB><b>常用表格单据上传</b></font></td></tr>
            <tr><td>提示信息:</td></tr>
            <tr><td>1.单击“浏览”选择需要上传服务器端的表格单据文件，路径选择完成后单击“上传”完成文件上载。</td></tr>
            <tr><td>2.常用表格单据上传功能仅支持后缀为doc/docx/xls/pdf的文件。</td></tr>
            <tr><td>3.由于存储空间限制，该功能暂限制单个上传文件最大为2m。</td></tr>
            <form action="upload?type=1" name="uploadform" method="POST" enctype="multipart/form-data">
              <tr><td><div id="dvReadAttach1" style="display:none"></div><a href="javascript:fAddAttach(1);" id="aAddAttach1">添加文件</a><br>
                <input type="submit" name="upload" value="上 传" class="submit" onclick="javascript:return confirm('您确认要上传此文件？')"></td></tr>
              </form>
            </table>
          </div>
        </body>
      </html>

4.配置web.xml

目录结构：../E-gov/resource/upload.html

                    ../myweb/upload.java

<servlet>
    <servlet-name>upload</servlet-name>
    <servlet-class>myweb.upload</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>upload</servlet-name>
    <url-pattern>/resource/upload</url-pattern>
  </servlet-mapping>