jsp上传显示问题！！急等高手指教！！

是文件！！主要是些doc，ppt之类的！！

我这个也是在网上找的,作者不知道是谁了,希望对你有帮助
1.RunningUpLoader上传Bean
  首先是RunningUpLoader.java，代码有些多，因为我是自己来解析输入流的。package testupload;
import java.io.*;
import javax.servlet.http.HttpServletRequest;
public class RunningUpLoader {
    public RunningUpLoader() {
    }    /**
     * 上传文件
     * @param request HttpServletRequest Servlet的请求对象
     * @param name String 要上传的文件在表单中的参数名
     * @param fileName String 保存在服务器上的文件名
     * @throws IOException
     */
    public void doUpload(HttpServletRequest request, String name,String fileName) throws
            IOException {
        InputStream in = request.getInputStream();
        byte[] buffer = getFileContent(name,in);
        FileOutputStream fos = new FileOutputStream(fileName);
        fos.write(buffer,0,buffer.length-1);
        fos.close();
    }    /**
     * 获取上传的文件buffer,结尾处将多一个换行符
     * @param name String 文件上传参数的名字
     * @param is InputStream 服务器对话的输入流
     * @return byte[] 返回获取的文件的buffer,结尾处多一个换行符
     * @throws IOException
     */
    private byte[] getFileContent(String name, InputStream is) throws IOException{
        int index;
        boolean isEnd = false;
        byte[] lineSeparatorByte;
        byte[] lineData;
        String content_disposition;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        BufferedInputStream bis = new BufferedInputStream(is);        lineSeparatorByte = readStreamLine(bis);
        while(!isEnd) {
            lineData = readStreamLine(bis);
            if(lineData == null) {
                break;
            }
            content_disposition = new String(lineData,"ASCII");
            index = content_disposition.indexOf("name=\"" + name + "\"");
            if (index >= 0 && index < content_disposition.length()) {
                System.out.println(readStreamLineAsString(bis)); // skip a line
                System.out.println(readStreamLineAsString(bis)); // skip a line                while ((lineData = readStreamLine(bis)) != null) {
                    System.out.println(new String(lineData));
                    if (isByteArraystartWith(lineData, lineSeparatorByte)) { // end
                        isEnd = true;
                        break;
                    } else {
                        bos.write(lineData);
                    }
                }
            }else {
                lineData = readStreamLine(bis);
                if(lineData == null)
                    return null;
                System.out.println(new String(lineData,"ASCII"));
                while(!isByteArraystartWith(lineData, lineSeparatorByte)) {
                    lineData = readStreamLine(bis);
                    if(lineData == null)
                        return null;
                    System.out.println(new String(lineData,"ASCII"));
                }
            }
        }
        return bos.toByteArray();
    }    private byte[] readStreamLine(BufferedInputStream in) throws IOException{
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        int b = in.read();
        if(b== -1)
            return null;
        while(b != -1 && b != '\n') {
            bos.write(b);
            b = in.read();
        }
        return bos.toByteArray();
    }    private String readStreamLineAsString(BufferedInputStream in) throws IOException {
        return new String(readStreamLine(in),"ASCII");
    }    private boolean isByteArraystartWith(byte[] arr,byte[] pat) {
        int i;
        if(arr == null || pat == null)
            return false;
        if(arr.length < pat.length)
            return false;
        for(i=0;i<pat.length;i++) {
            if(arr[i] != pat[i])
                return false;
        }
        return true;
    }
}
上传文件文件的时候，需要在之前的html中增加一个form表单，里面需要有个<input type="file" name="fileUpload" >的输入按钮。这样，浏览器才会将要上传的文件递交给服务器。其中name="fileUpload"的名字，就是RunnningUpLoader.doUpload函数中的name参数。使用的时候直接用bean就OK了。比如upload.jsp如下：<jsp:useBean id="upBean" scope="page" class="testupload.RunningUpLoader" /><%upBean.doUpload(request,"fileupload","runningUpLoad.txt");%> 2. RunningDownLoader下载Bean
package testupload;
import java.io.*;
import javax.servlet.http.HttpServletResponse;
import java.net.URLEncoder;public class RunningDownLoader {
    public RunningDownLoader() {
    }    public void doDownload(HttpServletResponse response, String filePath,String fileName) throws
            IOException {
        response.reset();//可以加也可以不加
     response.setContentType("application/x-download");//设置为下载application/x-download
     System.out.println(this.getClass().getClassLoader().getResource("/").getPath());
     String filenamedownload = filePath;
     String filenamedisplay = fileName;//系统解决方案.txt
     filenamedisplay = URLEncoder.encode(filenamedisplay,"UTF-8");
     response.addHeader("Content-Disposition","attachment;filename=" + filenamedisplay);     OutputStream output = null;
     FileInputStream fis = null;
     try
     {
         output  = response.getOutputStream();
         fis = new FileInputStream(filenamedownload);         byte[] b = new byte[1024];
         int i = 0;         while((i = fis.read(b)) > 0)
         {
             output.write(b, 0, i);
         }
         output.flush();
     }
     catch(Exception e)
     {
         System.out.println("Error!");
         e.printStackTrace();
     }
     finally
     {
         if(fis != null)
         {
             fis.close();
             fis = null;
         }
         if(output != null)
         {
             output.close();
             output = null;
         }
     }    } }
   下载文件，最好是做到Servlet上。直接在Servlet的doGet下面增加如下代码即可//Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        RunningDownLoader downloader= new RunningDownLoader();
        downloader.doDownload(response,"E:\\MyProjects\\testupload.rar","upload.bin");
    }

呵呵,下一个jspSmartUpload包,就搞定了,将里边的class文件放到你的tomcat下WEB_INF里的class目录下就行!上传文件程序:upload.jsp
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*,java.text.SimpleDateFormat,java.util.*,java.io.*,com.jspsmart.upload.*" errorPage="" %>
<jsp:useBean id="mySmartUpload" scope="page" class="com.jspsmart.upload.SmartUpload" />
mySmartUpload.initialize(pageContext);
    mySmartUpload.setMaxFileSize(10000000);
    mySmartUpload.setTotalMaxFileSize(30000000);
    mySmartUpload.setDeniedFilesList("dll,,");
// Upload
mySmartUpload.upload(); // Select each file
for (int i=0;i<mySmartUpload.getFiles().getCount();i++){ // Retreive the current file
com.jspsmart.upload.File myFile = mySmartUpload.getFiles().getFile(i); // Save it only if this file exists
if (!myFile.isMissing()) { // Save the files with its original names in a virtual path of the web server
myFile.saveAs("/upload/" + myFile.getFileName());
// myFile.saveAs("/upload/" + myFile.getFileName(), mySmartUpload.SAVE_VIRTUAL); // sample with a physical path
// myFile.saveAs("c:\\temp\\" + myFile.getFileName(), mySmartUpload.SAVE_PHYSICAL); //  Display the properties of the current file
tt=tt+myFile.getFileName()+"&";
} }
下载文件程序:download.jsp
<%@ page import="com.jspsmart.upload.*" contentType="text/html; charset=gb2312"%><%@ include file="inc/trans1.inc"%><%
// 新建一个SmartUpload对象
SmartUpload su = new SmartUpload();
// 初始化
String str=trans(request.getParameter("str"));
su.initialize(pageContext);
                // 设定contentDisposition为null以禁止浏览器自动打开文件，
                //保证点击链接后是下载文件。若不设定，则下载的文件扩展名为
                //doc时，浏览器将自动用word打开它。扩展名为pdf时，
                //浏览器将用acrobat打开。
        su.setContentDisposition(null);
                // 下载文件
        su.downloadFile("/upload/"+str);
%>
再写一个上传页面:1.html
<HTML>
<BODY BGCOLOR="white"><H1>jspSmartUpload : Sample 2</H1>
<HR><FORM METHOD="POST" ACTION="download.jsp" ENCTYPE="multipart/form-data">
   <INPUT TYPE="FILE" NAME="FILE1" SIZE="50"><BR>
   <INPUT TYPE="FILE" NAME="FILE2" SIZE="50"><BR>
   <INPUT TYPE="FILE" NAME="FILE3" SIZE="50"><BR>
   <INPUT TYPE="FILE" NAME="FILE4" SIZE="50"><BR>
   <INPUT TYPE="SUBMIT" VALUE="Upload">
</FORM></BODY>
</HTML>
这是最简单的组件,上传doc文件很好用

用多段上传，
<form action="" method="POST" enctype="multipart/form-data">还要用上fileupload包，到sun公司去下。再去看看“一个关于文件上传的问题 ”这个贴，里面代码有你要用的上。

调试易

jsp上传显示问题！！急等高手指教！！

解决方案 »