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这篇文章主要为大家展示了“web中如何解决文件上传取不到真实路径问题”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“web中如何解决文件上传取不到真实路径问题”这篇文章吧。
1、问题描述:
前一段时间要做一个excel数据导入到数据库的功能,当时用的是google chrome,没有用form表单,仅仅一个<input type="file"/>组件,上传excel时怎么也去不到文件路径,不论是从哪个驱动器上传,文件路径都是:c:\fakepath\文件名.xls。
2、解决方案
网上转悠了老半天,没找到一个完美的方案,最后经个同事指导:
利用一个js(插件)ajaxfileupload.js,源码放到最后面,先看具体代码:
jsp:
<div class="rcon"> <a href="download/subcompany.xls" >下载号码模板</a> <br /> <hr /> <input id="newfile" name="newfile" type="hidden" /> 选择文件： <input type="file" id="subfile" name="subfile" /> <br /> <input type="button" value="导入" id="importsub" /> </div>
注意: file input的name属性必须的,后面要用.
js代码:(17行用到了input的name属性)
文件上传到: url : '<%=webapp%>' + '/FileUpload?path=file/share',这里用了servlet(该servlet对FileUpload路径进行拦截)
当然可以用action
$.ajaxFileUpload方法的成功回调方法有参数data及status,其中从data可以得知上传上去的文件的名字:文件名=data.img
function uploadfile() {
var upload_file = $("#subfile").val();
if (upload_file == null || upload_file == undefined || upload_file == "") {
Showbo.Msg.alert('系统提示:请选择要上传的文件!');
return false;
} else {
var file = upload_file.split('.');
var suffix = file[file.length - 1];
if (suffix != 'xls') {
Showbo.Msg.alert('文件格式必须是:xls');
return;
}
// $("#fileReal").val(upload_file);
$.ajaxFileUpload( {
url : '<%=webapp%>' + '/FileUpload?path=file/share',
secureuri : true,
fileElementId : 'subfile',
dataType : 'json',
success : function(data, status) {
$('#pic').attr( {
src : '<%=webapp%>/file/share/' + data
});
$('#newfile').val(data.img);
var filename = data.img;
importSubNum(filename);
//$('#pubbt').click();
/* $('#form1').submit();*/
/*Showbo.Msg.alert('文件上传成功！');*/
},
error : function(data, status, e) {
Showbo.Msg.alert('系统提示:' + e);
return false;
}
});
}
}当然靠上面的不够的,真正上传的幕后是(servlet):
package com.hg.sale.service.upload;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONObject;
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 org.apache.log4j.Logger;
/**
* 上传Service
*
* @author lvzhibo
*
*/
public class FileUpload extends HttpServlet {
static Logger logf=Logger.getLogger(FileUpload.class);
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
DiskFileItemFactory factory = new DiskFileItemFactory();
String param=request.getParameter("path");
String rename=request.getParameter("rename");
String name=request.getParameter("name");
String log=request.getParameter("log");
String path ="";
if(param!=null){
path = request.getRealPath(param);
}else{
path = request.getRealPath("/p_w_picpaths");
}
// 设置文件存储位置
factory.setRepository(new File(path));
// 设置大小，如果文件小于设置大小的话，放入内存中，如果大于的话则放入磁盘中
factory.setSizeThreshold(1024 * 1024);
ServletFileUpload upload = new ServletFileUpload(factory);
// 这里就是中文文件名处理的代码，其实只有一行，serheaderencoding就可以了
upload.setHeaderEncoding("gbk");
try {
List<FileItem> items = upload.parseRequest(request);
for (FileItem item : items) {
if (item.isFormField()) {
} else {
String fileName = item.getName();
if (fileName != null) {
int pos = fileName.lastIndexOf("\\");
if (pos + 1 < fileName.length()) {
fileName = fileName.substring(pos + 1);
}
}
//author xuzijin 6.19 自定义图片名称
File fpath=new File(path);
if(!fpath.exists()){
fpath.mkdir();
}
if(name!=null&&rename!=null){
String[] str=fileName.split("\\.");
int rnm=Integer.parseInt(rename);
if(rnm<=4){
fileName=name+"_main_"+rename+"."+str[1];
}else{
int rn=rnm-4;
fileName=name+"_icon_"+rn+"."+str[1];
}
}
if(name==null&&rename!=null){
String[] str=fileName.split("\\.");
int rnm=Integer.parseInt(rename);
String imgName="";
switch(rnm){
case 2001:
imgName="attr_1";
break;
case 2002:
imgName="attr_2";
break;
case 2003:
imgName="attr_3";
break;
case 2004:
imgName="attr_4";
break;
case 2005:
imgName="attr_5";
break;
case 2006:
imgName="attr_6";
break;
case 2007:
imgName="attr_7";
break;
case 2008:
imgName="attr_8";
break;
}
fileName=imgName+"."+str[1];
}
if(rename==null&&name==null&&log==null){
fileName=getTime()+getExtensionName(fileName);
}
/*if(rename==null&&name==null&&log.equals("time")){
fileName= getFileName(fileName)+getTime()+getExtensionName(fileName);
}*/
response.setContentType("text/html");
response.setCharacterEncoding("gbk");
item.write(new File(path, fileName));
PrintWriter out = response.getWriter();
JSONObject obj=new JSONObject();
obj.put("img", fileName);
out.println(obj.toString());
logf.info("xml="+(obj.toString()));
}
}
} catch (FileUploadException e) {
response.getWriter().print(e.toString());
} catch (Exception e) {
e.printStackTrace();
response.getWriter().print(e.toString());
}
}
public String getExtensionName(String filename) {
if ((filename != null) && (filename.length() > 0)) {
int dot = filename.lastIndexOf('.');
if ((dot >-1) && (dot < (filename.length() - 1))) {
return filename.substring(dot);
}
}
return filename;
}
public String getTime(){
SimpleDateFormat formatter = new SimpleDateFormat ("yyyyMMddhh34mmss");
Date curDate = new Date(System.currentTimeMillis());//获取当前时间
String str = formatter.format(curDate);
return str;
}
public String getFileName(String filename) {
if ((filename != null) && (filename.length() > 0)) {
int dot = filename.lastIndexOf('.');
if ((dot >-1) && (dot < (filename.length() - 1))) {
return filename.substring(0,dot-1);
}
}
return filename;
}
}ajaxfileupload.js
// JavaScript Document
jQuery.extend({
createUploadIframe: function(id, uri)
{
//create frame
var frameId = 'jUploadFrame' + id;
if(window.ActiveXObject) {
var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
if(typeof uri== 'boolean'){
io.src = 'javascript:false';
}
else if(typeof uri== 'string'){
io.src = uri;
}
}
else {
var io = document.createElement('iframe');
io.id = frameId;
io.name = frameId;
}
io.style.position = 'absolute';
io.style.top = '-1000px';
io.style.left = '-1000px';
document.body.appendChild(io);
return io;
},
createUploadForm: function(id, fileElementId)
{
//create form
var formId = 'jUploadForm' + id;
var fileId = 'jUploadFile' + id;
var form = jQuery('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
var oldElement = jQuery('#' + fileElementId);
var newElement = jQuery(oldElement).clone();
jQuery(oldElement).attr('id', fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
//set attributes
jQuery(form).css('position', 'absolute');
jQuery(form).css('top', '-1200px');
jQuery(form).css('left', '-1200px');
jQuery(form).appendTo('body');
return form;
},
ajaxFileUpload: function(s) {
// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
s = jQuery.extend({}, jQuery.ajaxSettings, s);
var id = s.fileElementId;
var form = jQuery.createUploadForm(id, s.fileElementId);
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;
if( s.global && ! jQuery.active++ )
{
// Watch for a new set of requests
jQuery.event.trigger( "ajaxStart" );
}
var requestDone = false;
// Create the request object
var xml = {};
if( s.global )
{
jQuery.event.trigger("ajaxSend", [xml, s]);
}
var uploadCallback = function(isTimeout)
{
// Wait for a response to come back
var io = document.getElementById(frameId);
try
{
if(io.contentWindow)
{
xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
}else if(io.contentDocument)
{
xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
}
}catch(e)
{
jQuery.handleError(s, xml, null, e);
}
if( xml || isTimeout == "timeout")
{
requestDone = true;
var status;
try {
status = isTimeout != "timeout" ? "success" : "error";
// Make sure that the request was successful or notmodified
if( status != "error" )
{
// process the data (runs the xml through httpData regardless of callback)
var data = jQuery.uploadHttpData( xml, s.dataType );
if( s.success )
{
// ifa local callback was specified, fire it and pass it the data
s.success( data, status );
};
if( s.global )
{
// Fire the global callback
jQuery.event.trigger( "ajaxSuccess", [xml, s] );
};
} else
{
jQuery.handleError(s, xml, status);
}
} catch(e)
{
status = "error";
jQuery.handleError(s, xml, status, e);
};
if( s.global )
{
// The request was completed
jQuery.event.trigger( "ajaxComplete", [xml, s] );
};
// Handle the global AJAX counter
if(s.global && ! --jQuery.active)
{
jQuery.event.trigger("ajaxStop");
};
if(s.complete)
{
s.complete(xml, status);
} ;
jQuery(io).unbind();
setTimeout(function()
{ try
{
jQuery(io).remove();
jQuery(form).remove();
} catch(e)
{
jQuery.handleError(s, xml, null, e);
}
}, 100);
xml = null;
};
}
// Timeout checker
if( s.timeout > 0 )
{
setTimeout(function(){
if( !requestDone )
{
// Check to see ifthe request is still happening
uploadCallback( "timeout" );
}
}, s.timeout);
}
try
{
var form = jQuery('#' + formId);
jQuery(form).attr('action', s.url);
jQuery(form).attr('method', 'POST');
jQuery(form).attr('target', frameId);
if(form.encoding)
{
form.encoding = 'multipart/form-data';
}
else
{
form.enctype = 'multipart/form-data';
}
jQuery(form).submit();
} catch(e)
{
jQuery.handleError(s, xml, null, e);
}
if(window.attachEvent){
document.getElementById(frameId).attachEvent('onload', uploadCallback);
}
else{
document.getElementById(frameId).addEventListener('load', uploadCallback, false);
}
return {abort: function () {}};
},
uploadHttpData: function( r, type ) {
var data = !type;
data = type == "xml" || data ? r.responseXML : r.responseText;
// ifthe type is "script", eval it in global context
if( type == "script" )
{
jQuery.globalEval( data );
}
// Get the JavaScript object, ifJSON is used.
if( type == "json" )
{
eval( "data = " + data );
}
// evaluate scripts within html
if( type == "html" )
{
jQuery("<div>").html(data).evalScripts();
}
return data;
}
});以上是“web中如何解决文件上传取不到真实路径问题”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注亿速云行业资讯频道！
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