webuploader用 servlet转发给jsp，jsp页面收不到呢？

Question

这是servlet 代码

 package com.servlet;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
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.FileUploadBase.SizeLimitExceededException;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;


public class UploadServlet extends HttpServlet {
        @SuppressWarnings({ "rawtypes", "null" })
        public void service(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            PrintWriter out=response.getWriter();
            try{
            final long MAX_SIZE = 3* 1024 * 1024;// 设置上传文件最大为 3M
            // 允许上传的文件格式的列表
            final String[] allowedExt = new String[] {"jpg","jpeg","gif"};
            response.setContentType("text/html");
            // 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload
            DiskFileItemFactory dfif = new DiskFileItemFactory();
            dfif.setSizeThreshold(4096);// 设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘
            dfif.setRepository(new File(request.getRealPath("/")+ "upload"));// 设置存放临时文件的目录,web根目录下的upload目录
            System.out.println("临时目录:"+new File(request.getRealPath("/")+ "upload"));
            // 用以上工厂实例化上传组件
            ServletFileUpload sfu = new ServletFileUpload(dfif);
            // 设置最大上传尺寸
            sfu.setSizeMax(MAX_SIZE);
            // 从request得到 所有 上传域的列表
            List fileList = null;
            try {
                fileList = sfu.parseRequest(request);   
            } catch (FileUploadException e) {// 处理文件尺寸过大异常
                if (e instanceof SizeLimitExceededException) {
                    out.println("文件尺寸超过规定大小:" + MAX_SIZE + "字节!");
                    return;
                }
                e.printStackTrace();
            }
            // 没有文件上传
            if (fileList == null || fileList.size() == 0) {
                out.println("请选择上传文件!");
                return;
            }
            // 得到所有上传的文件
            Iterator fileItr = fileList.iterator();
            System.out.println("fileList:"+fileList);
            // 循环处理所有文件 

            while (fileItr.hasNext()) {
                FileItem fileItem = null;
                String path = null;
                long size = 0;
                // 得到当前文件
                fileItem = (FileItem) fileItr.next();
                // 忽略简单form字段而不是上传域的文件域(<input type="text" />等)
                if (fileItem == null || fileItem.isFormField()) {
                    continue;
                }
                // 得到文件的完整路径
                path = fileItem.getName();
                // 得到文件的大小
                size = fileItem.getSize();
                if ("".equals(path) || size == 0) {
                    out.println("请选择上传文件!");
                    return;
                }
                // 得到去除路径的文件名
                String t_name = path.substring(path.lastIndexOf("//") + 1);//kaola.jpeg
                System.out.println("t_name:"+t_name);
                // 得到文件的扩展名(无扩展名时将得到全名)
                String t_ext = t_name.substring(t_name.lastIndexOf(".") + 1);//jpeg
                System.out.println(t_ext);
                // 拒绝接受规定文件格式之外的文件类型
                 String tmp=Arrays.toString(allowedExt);
                 Pattern p = Pattern.compile(t_ext);  
                 Matcher m = p.matcher(tmp); 
                 if (m.find()==true) {
                    //如果符合上传的格式
                        String now=new SimpleDateFormat("yyyyMMddhhmmssSSS").format(new Date());
                        System.out.println(now);
                        // 根据系统时间生成上传后保存的文件名
                        String prefix = now;
                        // 保存的最终文件完整路径,保存在web根目录下的upload目录下
                        String u_name = request.getRealPath("/") + "upload/"
                                + prefix + "." + t_ext;
                        String dwc;
                        dwc=u_name;

                     **  //转发给jsp页面
                        request.setAttribute("dwc",dwc);                                                   

                        request.getRequestDispatcher( "/files1/xinzengchandizhengmingg**uanli.jsp").forward(request,response); 


                        System.out.println("最终保存目录:"+u_name);
                        try {
                            File file = new File(u_name);
                            // 保存文件
                            fileItem.write(file);
                            out.println("文件上传成功. 已保存为: " + prefix + "." + t_ext
                                    + " &nbsp;&nbsp;文件大小: " + size + "字节<p />");                                    
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                }else {
                    System.out.println("不符合规定");
                    out.print("上传文件不符合规定!");
                }
            }
            }catch(Exception e){
                out.print("系统异常,请稍后再试!");
                e.printStackTrace();
            }
        }             
    }

** //转发给jsp页面
request.setAttribute("dwc",dwc);

                    request.getRequestDispatcher( "/files1/xinzengchandizhengmingg**uanli

这也我想把上传成功的文件名传给jsp页面，然后添加到数据库，，试了好多方法，传不去过去值。

Answer 1

jsp页面代码 特别长

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!--_meta 作为公共模版分离出去-->
<!DOCTYPE HTML>
<html>
<head>
    <meta charset="utf-8">
    <meta name="renderer" content="webkit|ie-comp|ie-stand">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no" />
    <meta http-equiv="Cache-Control" content="no-siteapp" />
    <link rel="Bookmark" href="<%=basePath %>favicon.ico" >
    <link rel="Shortcut Icon" href="<%=basePath %>favicon.ico" />
    <!--[if lt IE 9]>
    <script type="text/javascript" src="<%=basePath %>lib/html5.js"></script>
    <script type="text/javascript" src="<%=basePath %>lib/respond.min.js"></script>
    <![endif]-->
    <link rel="stylesheet" type="text/css" href="<%=basePath %>static/h-ui/css/H-ui.min.css" />
    <link rel="stylesheet" type="text/css" href="<%=basePath %>static/h-ui.admin/css/H-ui.admin.css" />
    <link rel="stylesheet" type="text/css" href="<%=basePath %>lib/Hui-iconfont/1.0.8/iconfont.css" />

    <link rel="stylesheet" type="text/css" href="<%=basePath %>static/h-ui.admin/skin/default/skin.css" id="skin" />
    <link rel="stylesheet" type="text/css" href="<%=basePath %>static/h-ui.admin/css/style.css" />
    <!--[if IE 6]>
    <script type="text/javascript" src="http://lib.h-ui.net/DD_belatedPNG_0.0.8a-min.js" ></script>
    <script>DD_belatedPNG.fix('*');</script><![endif]-->
    <!--/meta 作为公共模版分离出去-->

    <title>新增产品认证管理</title>
    <link href="<%=basePath %>lib/webuploader/0.1.5/webuploader.css" rel="stylesheet" type="text/css" />
    <script src="<%=basePath %>My97DatePicker/WdatePicker.js"></script>
</head>
<body>
<div class="page-container">
    <form class="form form-horizontal" id="form-article-add" action="<%=basePath %>prove_origin/add.action" method="post">
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>编号：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.number">
            </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>发证日期：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" id="" name="p.certificate_time" onclick="WdatePicker()" placeholder="YYYY-MM-DD">
            </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>产地编号：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.origin_num">
            </div>
        </div>
        <!-- <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>产地(乡、村)：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.origin">
            </div>
        </div> -->
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>产地(乡、村)：</label>
            <div class="formControls col-xs-8 col-sm-9"> <span class="select-box">
                <select name="" class="select">
                    <option value="0">项目</option>
                    <option value="1">人手</option>
                    <option value="2">原料挑选台</option>
                    <option value="3">切割机</option>
                    <option value="4">脱水机</option>
                    <option value="4">干燥机</option>
                    <option value="4">分选机</option>

                </select>
                </span> </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>生产者：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.producers">
            </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>产品名称：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.product_name">
            </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>数量(吨)：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.quantity">
            </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>收获日期：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" id="" name="p.gain_time" onclick="WdatePicker()" placeholder="YYYY-MM-DD">
            </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>质量检测类型：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.detection_type">
            </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>质量检测结果：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.detection_result">
            </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>运销商：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.marketing_agency">
            </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>电话：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.tel">
            </div>
        </div>
        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2"><span class="c-red">*</span>经办人：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <input type="text" class="input-text" value="" placeholder="" id="" name="p.agent">
            </div>
        </div>

<!--测试接收到servlet传值显示在text框中-->
<input type="text" class="input-text" value='${dwc}' placeholder="" id="" name="">

        <div class="row cl">
            <label class="form-label col-xs-4 col-sm-2">图片上传：</label>
            <div class="formControls col-xs-8 col-sm-9">
                <div class="uploader-list-container">
                    <div class="queueList">
                        <div id="dndArea" class="placeholder">
                            <div id="filePicker-2"></div>
                            <p>或将照片拖到这里，单次最多可选300张</p>
                        </div>
                    </div>
                    <div class="statusBar" style="display:none;">
                        <div class="progress"> <span class="text">0%</span> <span class="percentage"></span> </div>
                        <div class="info"></div>
                        <div class="btns">
                            <div id="filePicker2"></div>
                            <div class="uploadBtn">开始上传</div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <div class="row cl">
            <div class="col-xs-8 col-sm-9 col-xs-offset-4 col-sm-offset-2">
                <button class="btn btn-primary radius" type="submit"><i class="Hui-iconfont">&#xe632;</i> 保存</button>
                <a href="<%=basePath %>prove_origin/showall.action" target="mainFrame"><button class="btn btn-default radius" type="button">&nbsp;&nbsp;取消&nbsp;&nbsp;</button></a>
            </div>
        </div>
    </form>
</div>

<!--_footer 作为公共模版分离出去-->
<script type="text/javascript" src="<%=basePath %>lib/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript" src="<%=basePath %>lib/layer/2.4/layer.js"></script>
<script type="text/javascript" src="<%=basePath %>lib/webuploader/0.1.5/webuploader.min.js"></script>  
 <script type="text/javascript" src="<%=basePath %>lib/bootstrap-3.3.5-dist/js/bootstrap.min.js"></script> 

<script type="text/javascript" src="<%=basePath %>lib/jquery.validation/1.14.0/jquery.validate.js"></script>
<script type="text/javascript" src="<%=basePath %>lib/jquery.validation/1.14.0/validate-methods.js"></script>
<script type="text/javascript" src="<%=basePath %>lib/jquery.validation/1.14.0/messages_zh.js"></script>
<script type="text/javascript" src="<%=basePath %>static/h-ui/js/H-ui.js"></script>
<script type="text/javascript" src="<%=basePath %>static/h-ui.admin/js/H-ui.admin.page.js"></script></span>

<!--/_footer /作为公共模版分离出去-->

<!--请在下方写此页面业务相关的脚本-->
<script type="text/javascript" src="<%=basePath %>lib/webuploader/0.1.5/webuploader.min.js"></script>
<script type="text/javascript">
    $(function(){
        $('.skin-minimal input').iCheck({
            checkboxClass: 'icheckbox-blue',
            radioClass: 'iradio-blue',
            increaseArea: '20%'
        });

        $list = $("#fileList"),
                $btn = $("#btn-star"),
                state = "pending",
                uploader;

        var uploader = WebUploader.create({
            auto: true,
            swf: 'lib/webuploader/0.1.5/Uploader.swf',

            // 文件接收服务端。
            server: 'http://localhost:8080/Tjzhuisu/uploadServlet',

            // 选择文件的按钮。可选。
            // 内部根据当前运行是创建，可能是input元素，也可能是flash.
            pick: '#filePicker',

            // 不压缩image, 默认如果是jpeg，文件上传前会压缩一把再上传！
            resize: false,
            // 只允许选择图片文件。
            accept: {
                title: 'Images',
                extensions: 'gif,jpg,jpeg,bmp,png',
                mimeTypes: 'image/*'
            }
        });
        ////////////////////////////////////////////



        ///////////////////////////////////////////
         // 当有文件添加进来的时候
        uploader.on( 'fileQueued', function( file ) {
            var $li = $(
                            '<div id="' + file.id + '" class="item">' +
                            '<div class="pic-box"><img></div>'+
                            '<div class="info">' + file.name + '</div>' +
                            '<p class="state">等待上传...</p>'+
                            '</div>'
                    ),
                    $img = $li.find('img');
            $list.append( $li );

            // 创建缩略图
            // 如果为非图片文件，可以不用调用此方法。
            // thumbnailWidth x thumbnailHeight 为 100 x 100
            uploader.makeThumb( file, function( error, src ) {
                if ( error ) {
                    $img.replaceWith('<span>不能预览</span>');
                    return;
                }

                $img.attr( 'src', src );
                alert('图片地址   '+src);
            }, thumbnailWidth, thumbnailHeight );
        });

        // 文件上传过程中创建进度条实时显示。
        uploader.on( 'uploadProgress', function( file, percentage ) {
            var $li = $( '#'+file.id ),
                    $percent = $li.find('.progress-box .sr-only');

            // 避免重复创建
            if ( !$percent.length ) {
                $percent = $('<div class="progress-box"><span class="progress-bar radius"><span class="sr-only" style="width:0%"></span></span></div>').appendTo( $li ).find('.sr-only');
            }
            $li.find(".state").text("上传中");
            $percent.css( 'width', percentage * 100 + '%' );
        });

        // 文件上传成功，给item添加成功class, 用样式标记上传成功。
        uploader.on( 'uploadSuccess', function( file ) {
            $( '#'+file.id ).addClass('upload-state-success').find(".state").text("已上传");
        });
        //回调函数************************************************************
        uploader.on( 'uploadSuccess', function( file,response ) {
            var data = response.header;
            alert(data);

            alert(data.success);
        });

        // 文件上传失败，显示上传出错。
        uploader.on( 'uploadError', function( file ) {
            $( '#'+file.id ).addClass('upload-state-error').find(".state").text("上传出错");
        });

        // 完成上传完了，成功或者失败，先删除进度条。
        uploader.on( 'uploadComplete', function( file ) {
            $( '#'+file.id ).find('.progress-box').fadeOut();
        });
        uploader.on('all', function (type) {
            if (type === 'startUpload') {
                state = 'uploading';
            } else if (type === 'stopUpload') {
                state = 'paused';
            } else if (type === 'uploadFinished') {
                state = 'done';
            }

            if (state === 'uploading') {
                $btn.text('暂停上传');
            } else {
                $btn.text('开始上传');
            }
        });

        $btn.on('click', function () {
            if (state === 'uploading') {
                uploader.stop();
            } else {
                uploader.upload();
            }
        });

    });

    (function( $ ){
        // 当domReady的时候开始初始化
        $(function() {
            var $wrap = $('.uploader-list-container'),

            // 图片容器
                    $queue = $( '<ul class="filelist"></ul>' )
                            .appendTo( $wrap.find( '.queueList' ) ),

            // 状态栏，包括进度和控制按钮
                    $statusBar = $wrap.find( '.statusBar' ),

            // 文件总体选择信息。
                    $info = $statusBar.find( '.info' ),

            // 上传按钮
                    $upload = $wrap.find( '.uploadBtn' ),

            // 没选择文件之前的内容。
                    $placeHolder = $wrap.find( '.placeholder' ),

                    $progress = $statusBar.find( '.progress' ).hide(),

            // 添加的文件数量
                    fileCount = 0,

            // 添加的文件总大小
                    fileSize = 0,

            // 优化retina, 在retina下这个值是2
                    ratio = window.devicePixelRatio || 1,

            // 缩略图大小
                    thumbnailWidth = 110 * ratio,
                    thumbnailHeight = 110 * ratio,

            // 可能有pedding, ready, uploading, confirm, done.
                    state = 'pedding',

            // 所有文件的进度信息，key为file id
                    percentages = {},
            // 判断浏览器是否支持图片的base64
                    isSupportBase64 = ( function() {
                        var data = new Image();
                        var support = true;
                        data.onload = data.onerror = function() {
                            if( this.width != 1 || this.height != 1 ) {
                                support = false;
                            }
                        }
                        data.src = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";
                        return support;
                    } )(),