ExtJS4 上传文件类型和大小的判断方法（实例）

来源：互联网发布：php class 全局变量编辑：程序博客网时间：2024/06/10 06:19

源码下载：http://download.csdn.net/detail/biboheart/6036963

接本人博文《ExtJS4+strtus2文件上传实例》，在上面的基础上加上ExtJS上传文件前对文件类型和文件大小进行判断，不符合要求的将不能被上传。

PS：本人的原创博文是在开发中遇到的一些常见问题或难题作记录。由于我是初学者，知识面还远远不够，所以可能有许多地方并不是很好的解决方案，希望朋友你有想法能给予答复。谢谢！

开始本文的方案描述（源码稍后传上）：

一直没找到ExtJS4 filefield控件的文件类型过滤与文件大小过滤的方法，本人E文水平较差，没能从官网得到这方面的资料。在网上也没有找到前人对此应用的方法介绍。实在想不出好的办法了，我就用js来完成此应用。

index.jsp代码：

<%@ page language="java" contentType="text/html; charset=UTF-8"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" "http://www.w3.org/TR/html4/loose.dtd"><html><head><base href="<%=basePath%>" /><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>UploadFileExample</title><link rel="stylesheet" type="text/css"href="ExtJS/resources/css/ext-all.css" /><script type="text/javascript" src="ExtJS/ext-all.js"></script><script type="text/javascript" src="js/uploadFile.js"></script></head><body></body></html>

表单源码（UploadForm.js）代码：

Ext.define('AM.view.UploadForm',{extend:'Ext.panel.Panel',alias:'widget.uploadForm',initComponent: function() {Ext.apply(this, { height: 140,width: 514,title: 'ExtJS4文件上传',layout: {type: 'fit'},items: [{xtype: 'form',frame: true,bodyPadding: 10,id:'usermanage-addprisoner-form',items: [{xtype: 'filefield',id:'id_fileField',name:'file',fieldLabel: '文件',buttonText: '选择文件',anchor: '100%'}],dockedItems: [{xtype: 'panel',frame: true,layout: {padding: '0 10',type:'auto'},dock: 'bottom',items: [{xtype: 'button',text: '上传',id:'addFile',padding:'0 10'}]}]}],        }); this.callParent(arguments);}});

ExtJS控制层（UploadFile.js）代码：

Ext.define('AM.controller.UploadFile', {    extend: 'Ext.app.Controller',    views: ['UploadForm'    ],init:function(){this.control({'uploadForm button[id=addFile]':{click:addFile},'uploadForm filefield[id=id_fileField]':{change:checkFile}});}});function addFile(o){var form = Ext.getCmp("usermanage-addprisoner-form").getForm();if(form.isValid()){form.submit({url:'/UploadFile/uploadFile',method:'POST',waitMsg:'正在上传',success:function(form, action){var data = Ext.JSON.decode(action.response.responseText);                alert(data.message);},failure : function(form, action) {var data = Ext.JSON.decode(action.response.responseText);alert(data.message);}});};};function checkFile(o){//验证图片文件的正则var img_reg = /\.([jJ][pP][gG]){1}$|\.([jJ][pP][eE][gG]){1}$|\.([gG][iI][fF]){1}$|\.([pP][nN][gG]){1}$|\.([bB][mM][pP]){1}$/;if(!img_reg.test(o.value)){Ext.Msg.alert('提示','文件类型错误,请选择图片文件(jpe/jpeg/gif/png/bmp)');o.setRawValue('');}//取控件DOM对象var field = document.getElementById('id_fileField');//取控件中的input元素var inputs = field.getElementsByTagName('input');var fileInput = null;var il = inputs.length;//取出input 类型为file的元素for(var i = 0; i < il; i ++){if(inputs[i].type == 'file'){fileInput = inputs[i];break;}}if(fileInput != null){var fileSize = getFileSize(fileInput);//允许上传不大于1M的文件if(fileSize > 1000){Ext.Msg.alert('提示','文件太大，请选择小于1M的图片文件！');picItem.setRawValue('');}}}//计算文件大小，返回文件大小值，单位Kfunction getFileSize(target){var isIE = /msie/i.test(navigator.userAgent) && !window.opera;var fs = 0;if (isIE && !target.files) {var filePath = target.value;var fileSystem = new ActiveXObject("Scripting.FileSystemObject");var file = fileSystem.GetFile (filePath);fs = file.Size; }else if(target.files && target.files.length > 0){fs = target.files[0].size;}else{fs = 0;}if(fs > 0){fs = fs / 1024;}return fs;}

struts.xml请参照本人之前博文《ExtJS4+strtus2文件上传实例》；

action源码对上一次的有一点修改，但不是针对此文的应用而修改的。是上次应用中不够完善，作出的修改。如果只是本文应用，上面已经完成了方案。

public class UploadAction extends ActionSupport{private static final long serialVersionUID = 1L;private File file;private String fileFileName; //文件名称private String fileContentType; //文件类型private boolean success;public String execute() throws Exception {return SUCCESS;}public void responseHtmlText(String text){HttpServletResponse response = ServletActionContext.getResponse();response.setContentType("text/html;charset=UTF8");try {response.getWriter().write(text);} catch (IOException e) {return;}}public void responseJson(String jsonString){HttpServletResponse response = ServletActionContext.getResponse();response.setContentType("text/json;charset=UTF8");try {response.getWriter().write(jsonString);} catch (IOException e) {return;}}public void uploadFileUtils(){boolean success = false;success = true;if(file == null){responseHtmlText("{success:" + success + ",message:'服务端未收到文件'}");return;}String uploadPath = ServletActionContext.getServletContext().getRealPath("/upload");File savefile = new File(new File(uploadPath), fileFileName);if (!savefile.getParentFile().exists()){savefile.getParentFile().mkdirs();}try {FileUtils.copyFile(file, savefile);} catch (IOException e) {System.out.println("保存文件失败");responseHtmlText("{success:" + success + ",message:'保存文件失败'}");return;}responseHtmlText("{success:" + success + ",message:'文件上传成功'}");}@SuppressWarnings("resource")public void uploadFileIO(){boolean success = false;success = true;if(file == null){responseHtmlText("{success:" + success + ",message:'服务端未收到文件'}");return;}InputStream is = null;OutputStream os = null;//基于myFile创建一个文件输入流try {is = new FileInputStream(file);} catch (FileNotFoundException e) {is = null;System.out.println("创建文件失败");responseHtmlText("{success:" + success + ",message:'创建文件失败'}");return;}//设置上传文件目录String uploadPath = ServletActionContext.getServletContext().getRealPath("/upload");System.out.println(uploadPath);//设置目标文件File savefile = new File(uploadPath, this.getFileFileName());if (!savefile.getParentFile().exists()){savefile.getParentFile().mkdirs();}//创建一个输出流try {os = new FileOutputStream(savefile);} catch (FileNotFoundException e) {os = null;System.out.println("创建输出流失败");responseHtmlText("{success:" + success + ",message:'创建输出流失败'}");return;}//设置缓存byte[] buffer = new byte[1024];int length = 0;//读取文件输出到toFile文件中try {while ((length = is.read(buffer)) > 0) {      os.write(buffer, 0, length);  }} catch (IOException e) {System.out.println("读取文件失败");responseHtmlText("{success:" + success + ",message:'读取文件失败'}");return;}System.out.println("上传文件名" + fileFileName);          System.out.println("上传文件类型" + fileContentType);        if(is != null){        try {is.close();} catch (IOException e) {System.out.println("关闭输入流失败");e.printStackTrace();}        }        if(os != null){        try {os.close();} catch (IOException e) {System.out.println("关闭输出流失败");return;}        }        responseHtmlText("{success:" + success + ",message:'文件上传成功'}");}public File getFile() {return file;}public void setFile(File file) {this.file = file;}public boolean isSuccess() {return success;}public void setSuccess(boolean success) {this.success = success;}public String getFileContentType() {return fileContentType;}public void setFileContentType(String fileContentType) {this.fileContentType = fileContentType;}public String getFileFileName() {return fileFileName;}public void setFileFileName(String fileFileName) {this.fileFileName = fileFileName;}}

其它不多说了，不明白的地方可以留言！