fileupload上传代码

fileupload上传代码

import java.io.IOException;
import java.io.PrintWriter;

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

import org.apache.commons.fileupload.*;
import java.util.*;
import java.util.regex.*;
import java.io.*;
import java.net.ResponseCache;

import org.apache.commons.fileupload.servlet.*;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;

/**//*
 * 创建日期 2005-4-10
 *
 * TODO 要更改此生成的文件的模板，请转至
 * 窗口 － 首选项 － Java － 代码样式 －代码模板
 */

/** *//**
 * @author gaolong1
 * 
 * TODO 要更改此生成的类型注释的模板，请转至 窗口 － 首选项 － Java － 代码样式 －代码模板
 */
public class upload extends HttpServlet
...{

    /** *//**
     * Destruction of the servlet. <br>
     */
    private String uploadPath = "D:/upload/"; // 用于存放上传文件的目录

    private File tempPath = new File("D:/upload/tmp/"); // 用于存放临时文件的目录

    public void destroy()
    ...{
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }

    /** *//**
     * The doPost method of the servlet. <br>
     * 
     * This method is called when a form has its tag value method equals to
     * post.
     * 
     * @param request
     *            the request send by the client to the server
     * @param response
     *            the response send by the server to the client
     * @throws ServletException
     *             if an error occurred
     * @throws IOException
     *             if an error occurred
     */
    public void doPost(HttpServletRequest req, HttpServletResponse res)
            throws ServletException, IOException
    ...{
        res.setContentType("text/html; charset=GB2312");
        PrintWriter out = res.getWriter();
        System.out.println(req.getContentLength());
        System.out.println(req.getContentType());
        DiskFileItemFactory factory = new DiskFileItemFactory();
        // maximum size that will be stored in memory
//         设置最多只允许在内存中存储的数据,单位:字节
//         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.setSizeThreshold(4*1024);
        // the location for saving data that is larger than getSizeThreshold()
        factory.setRepository(new File("d:/upload/addnetFile/temp"));

        ServletFileUpload upload = new ServletFileUpload(factory);
        // maximum size before a FileUploadException will be thrown
//         设置允许用户上传文件大小,单位:字节
        
        int maxUploadSize = 2*1024*1024;
        upload.setSizeMax(maxUploadSize);
        System.out.println("ww");
        try
        ...{
            List fileItems = upload.parseRequest(req);
            System.out.println(fileItems.size());
            System.out.println(fileItems.get(0));
            // assume we know there are two files. The first file is a small
            // text file, the second is unknown and is written to a file on
            // the server
            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 =
            ...{ ".exe", ".com", ".cgi", ".asp" };
            Pattern p = Pattern.compile(regExp);
            while (iter.hasNext())
            ...{
                System.out.println("FileItem");
                FileItem item = (FileItem) iter.next();
                // 忽略其他不是文件域的所有表单信息
                System.out.println("aaaaaaaaa");
                System.out.println(item.getContentType());
                System.out.println("aaaaaaaaa");
                if (!item.isFormField())
                ...{
                    System.out.println("bbbbbbbbbbb");
                    String name = item.getName();
                    long size = item.getSize();
                    if ((name == null || name.equals("")) && size == 0)
                        continue;
                    if(size > maxUploadSize)
                    ...{
                        out.println("<script>alert('您上传的文件超过允许的大小,请重新上传此文件!')</script>");
                        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]))
                            ...{
                                throw new IOException(name + ": wrong type");
                            }
                        }
                        try
                        ...{
                            
                            Calendar calendar = Calendar.getInstance();
                            String year = new Integer( calendar.get(Calendar.YEAR)).toString();
                            String month = new Integer( calendar.get(Calendar.MONTH) + 1).toString();
                            String day = new Integer( calendar.get(Calendar.DATE)).toString();
                            String hour = new Integer( calendar.get(Calendar.HOUR_OF_DAY)).toString();
                            String minute = new Integer( calendar.get(Calendar.MINUTE)).toString();
                            String second = new Integer( calendar.get(Calendar.SECOND)).toString();

                            // 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
                            //不要直接用d:/这样跨平台不行,改成相对路径
                            
                            String uploadPath = "d:/" + year + "/" + month + "/" + day + "/";
                            String uploadFileName = year + month + day + hour + minute + second + m.group(1);
                            
                            File uploadDir = new File(uploadPath);
                            
                            if(!uploadDir.exists())
                            ...{
                                if(uploadDir.mkdirs())
                                ...{
                                    System.out.println("success");
                                }
                                else
                                ...{
                                    System.out.println("create dir faile");
                                }
                            }
                            
                            
                            //File uploadFile = new File(uploadPath + uploadFileName);
                            //uploadFile.createNewFile();
                            
                            //item.write(new File("d:/" + m.group(1)));
                            
                            item.write(new File(uploadPath + uploadFileName));
                            
                            System.out.println(uploadFileName + "  " + size + "<br>");
                        }
                        catch (Exception e)
                        ...{
                            out.println(e);
                        }

                    }
                    else
                    ...{
                        throw new IOException("fail to upload");
                    }
                }
            }
        }
        catch (IOException e)
        ...{
            out.println(e);
        }
        catch (FileUploadException e)
        ...{
            out.println(e);
        }

        // 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

    }

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException
    ...{
        // TODO Auto-generated method stub
    }

    /** *//**
     * Initialization of the servlet. <br>
     * 
     * @throws ServletException
     *             if an error occure
     */
    public void init() throws ServletException
    ...{
        // Put your code here
    }

}

 

html测试代码

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="multipart" content="form-data; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form id="form1" name="form1" enctype="multipart/form-data" method="post" action="FileUpload">
        <input id=aa name=file1 type="file"/>
        <input id=bb name=file2 type="file"/>
        <input type="submit" name="Submit" value="submit" />
    </form>
</body>
</html>

这两段代码都能正确执行.

但我遇到一个怪问题,不知是tomcat的问题,还是哪的问题,这两段代码三个月前我写的时候能正确运行,昨天我重新试了半天,却不能运行了,也没报错,就是上传不了,今天,我什么都没改,却又能运行了,怪了,昨天我重起过tomcat,都不行.在我的编程经历中,遇到过好几次这样的情况,不知是怎么回事

补记:

用common-fileupload上传文件有个小地方一定要注意,即<input id=aa name=file1 type=file/>中的name一定要写,如果没写就会出现我上面的错误,上传不了文件,但却不报错.