uploadify前臺上傳檔案,java後臺處理的例子

我是壞男孩發表於2016-08-26
Java

1、先建立一個簡單的web專案upload (如圖1-1)

2、外掛的準備

(1)、去uploadify的官網下載一個uploadify外掛,然後解壓新建個js資料夾放進去(這個不強求，只要路徑對了就可以)

(2)、準備所需要的後端處理上傳檔案的jar包:commons-fileupload-1.2.1.jar

3、新建一個JSP即index.jsp +servlet即UploadServlet.java

 

     圖1-1

4、花幾分鐘對這些簡單的配置完成後就可以看看index.jsp與UoloadServlet.java

(1)index.jsp

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<base href="<%=basePath%>">
		<title>My JSP 'index.jsp' starting page</title>
		<meta http-equiv="pragma" content="no-cache">
		<meta http-equiv="cache-control" content="no-cache">
		<meta http-equiv="expires" content="0">
		<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
		<meta http-equiv="description" content="This is my page">
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<link rel="stylesheet" type="text/css" href="css/uploadify.css">
		<script src="<%=basePath%>js/uploadify/jquery-1.4.2.min.js"></script>
		<script src="<%=basePath%>js/uploadify/jquery.uploadify.v2.1.4.min.js"></script>
		<script src="<%=basePath%>js/uploadify/swfobject.js"></script>
	</head>
	<body>
		This is my JSP page.
		<br>
		<table class="stable tp0" cellSpacing="0" cellPadding="0" border="0">
            <tr>
                <td width="15%" align="left" colspan="4" style="padding-left: 158px">
 
                    <input type="hidden" id="fileSize" value="0" />
 
                    <div id="custom-queue"></div> 附件：<input id="uploadify" type="file"
                    name="Filedata" />
                </td>
            </tr>
        </table>
	</body>
	<script type="text/javascript">
  $(document).ready(function(){
  
      $(document).ready(function () {
            $("#uploadify").uploadify({
                'uploader': '<%=basePath%>js/uploadify/uploadify.swf',
                'script': '<%=basePath%>servlet/UploadServlet',
                'cancelImg': '<%=basePath%>js/uploadify/cancel.png',
                'folder': 'upload',
                'queueID' : 'custom-queue',
                'auto':true,
                'multi':true,
                'fileDataName':'Filedata',
                 'onCancel' : function(file) {  
                },
                'onUploadError' : function(file, errorCode, errorMsg, errorString) {  
                    alert(456);  
                }
            });
        });
  });

  </script>
</html>

(2).UoloadServlet.java

package coms;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.UUID;

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

public class UploadServlet extends HttpServlet {

    @Override
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        String savePath = this.getServletConfig().getServletContext()
                .getRealPath("");
        //儲存檔案的路徑
        savePath = savePath + "/upload/";
        File f1 = new File(savePath);
        System.out.println(savePath);
        //如果檔案不存在,就新建一個
        if (!f1.exists()) {
            f1.mkdirs();
        }
        //這個是檔案上傳需要的類,具體去百度看看,現在只管使用就好
        DiskFileItemFactory fac = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(fac);
        upload.setHeaderEncoding("utf-8");
        List fileList = null;
        try {
            fileList = upload.parseRequest(request);
        } catch (FileUploadException ex) {
            return;
        }
        //迭代器,搜尋前端傳送過來的檔案
        Iterator<FileItem> it = fileList.iterator();
        String name = "";
        String extName = "";
        while (it.hasNext()) {
            FileItem item = it.next();
            //判斷該表單項是否是普通型別
            if (!item.isFormField()) {
                name = item.getName();
                long size = item.getSize();
                String type = item.getContentType();
                System.out.println(size + " " + type);
                if (name == null || name.trim().equals("")) {
                    continue;
                }
                // 副檔名格式： extName就是檔案的字尾,例如 .txt
                if (name.lastIndexOf(".") >= 0) {
                    extName = name.substring(name.lastIndexOf("."));
                }
                File file = null;
                do {
                    // 生成檔名：
                    name = UUID.randomUUID().toString();
                    file = new File(savePath + name + extName);
                } while (file.exists());
                File saveFile = new File(savePath + name + extName);
                try {
                    item.write(saveFile);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
        response.getWriter().print(name + extName);
    }

}

對於jsp與java沒有好好說明,如果不懂可以私聊我,其實花了很多個小時才使用這個uploadify,主要是因為以為上傳只要uploadify外掛就可以，原來還需要:commons-fileupload-1.2.1.jar ,我是一個喜歡分享的人,希望每個人有能力都能寫寫部落格,讓更多人好好學習,覺得不錯就點一下推薦，讓更多人快速掌握。

5.鼓勵:覺得寫得有幫助就支付寶掃一下吧，對你沒有損失，也給我動力

 

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