package com.wgh.servlet;
import java.io.*;
import java.util.*;
import org.apache.commons.fileupload.*;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
@WebServlet("/UploadServlet")
public class UploadServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String uploadPath=getServletContext().getRealPath("/")+"upload"; //定义上传文件的地址
System.out.println(uploadPath);
File folder = new File(uploadPath);
if(!folder.exists())
folder.mkdirs();
String message=null;
String content=null;
String dtme=null;
if(ServletFileUpload.isMultipartContent(request)){ //判断是否获取的是文件
System.out.print("是文件");
DiskFileItemFactory disk=new DiskFileItemFactory();
disk.setSizeThreshold(20*1024); //设置内存可存字节数
disk.setRepository(disk.getRepository()); //设置临时文件目录
ServletFileUpload up=new ServletFileUpload(disk);
int maxsize=2*1024*1024;
List list=null;
try{
list=up.parseRequest(request); //获取上传列表
}
catch(Exception e){
e.printStackTrace();
}
Iterator i=list.iterator(); //创建列表的迭代器
while(i.hasNext()){
FileItem fm=(FileItem)i.next(); //遍历列表
if(!fm.isFormField()){
String filePath = fm.getName(); //获取文件全路径名
String fileName="";
int startIndex = filePath.lastIndexOf("\\");
if(startIndex!=-1){ //对文件名进行截取
fileName = filePath.substring(startIndex+1);
}else{
fileName=filePath;
}
if(fm.getSize()>maxsize){
message="文件太大了，不要超过2MB";
break;
}
String fileSize=new Long(fm.getSize()).toString();
if((fileName==null)||(fileName.equals(""))&&(fileSize.equals("0"))){
message="文件名不能为空，文件大小也不能为零！";
break;
}
File saveFile=new File(uploadPath,fileName);
System.out.println(uploadPath);
try{
fm.write(saveFile); //向文件中写入数据
message="文件上传成功！";
<span style="color: #FF0000;">InputStream inStream=fm.getInputStream();</span>//这行报错
System.out.println("hhhhhh");
}
catch(Exception e1){
e1.printStackTrace();
}
}
else{
String foename=fm.getFieldName(); //获取表单元素名
String con=fm.getString("UTF-8"); //获取表单内容，注意编码方式
//表单元素
if(foename.equals("upDe")){
content = con;
System.out.println("ok1");
}
else if(foename.equals("uptime")){
dtme = con;
System.out.println("ok2");
}
}
}
}
else
{
System.out.println("不是文件");
}
request.setAttribute("result",message);
request.setAttribute("upDe",content);
request.setAttribute("dtme",dtme);
RequestDispatcher rd=request.getRequestDispatcher("message.jsp");
rd.forward(request, response);
}
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
}
当文件超过20k时就会报错，
java.io.FileNotFoundException: C:\Users\wsn\AppData\Local\Temp\upload__1c3b5e7d_1476c27ed8a__7fff_00000006.tmp (系统找不到指定的文件。)
到底是怎样读取临时文件的文件流呢
这是index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
我在机器上试了。
1、你的这一行报错，InputStream inStream=fm.getInputStream();读不到文件，是应为fm是临时文件，上传成功后已经不存在了，所以你试图读取时报找不到文件的错误。
2、如果你想读文件流 ，可以这样读[code="java"]InputStream inStream = new FileInputStream(saveFile);[/code]
楼主粗心啊 你设置了上传上限为20k [code="java"][/code]disk.setSizeThreshold(20*1024); 当然会出错 手机回复 求给分