版权声明：本文为博主原创文章。未经博主同意不得转载。 https://blog.csdn.net/shanhuhau/article/details/28617999

首先须要引入上传控件

<script type="text/javascript" src="<%=basePath%>/js/ext/examples/ux/fileuploadfield/FileUploadField.js" charset="utf-8"></script>

弹出上传框相应extjs代码

var uploadForm=new Ext.FormPanel({

	id:'uploadForm',

	width:520,

	frame:true,

	fileUpload: true,

	autoHeight:true,

	bodyStyle:'10px 10px 0px 10px',

	labelWidth:50,

	enctype: 'multipart/form-data',

	defaults:{

		anchor: '95%',

        allowBlank: false

	},

	items:[

		{

			xtype:'fileuploadfield',

			emptyText: '请选择上传文件...',

            fieldLabel: '文件：',

            id:'uploadFile',

            name: 'upload',

            allowBlank: false,

            blankText: '文件名不能为空.',

             buttonCfg: {

	    				text: '选择...'// 上传文件时的本地查找按钮

	          }

		}

	],

	buttons: [{

	                text: '上传',

	                handler: function(){

	                    if(uploadForm.getForm().isValid()){

	                    	uploadForm.getForm().submit({

	    	                    url:basePath+ '/documentManage/upload_upload.action',

	    	                    method:'POST',

	    					    waitTitle: '请稍后',

	    	                    waitMsg: '正在上传文档文件 ...',

	    						success: function(fp, action){

	    	                	  	Ext.MessageBox.alert('信息', action.result.msg);

	    	                        Ext.getCmp("uploadFile").reset();          // 指定文件字段的id清空其内容

	    	                        addwin.hide();

									grid.store.load({params:{start : 0,limit : combo.value}});

	    	                    },

	    						failure: function(fp, action){

	    	                        Ext.MessageBox.alert('警告', action.result.msg);

	    	                        addwin.hide();

	    	                    }

	     	                });

	                    }

	                }

	            },{

	                text: '重置',

	                handler: function(){

	            		uploadForm.getForm().reset();

	                }

	            }]

});

addwin = new Ext.Window({

	title : '上传新文档',

	closable : true,

	width : 520,

	autoHeight: true,

	border : false,

	plain : true,

	modal : true,

	layout : 'fit',

	bodyStyle : 'padding:5px;',

	maximizable : false,// 禁止最大化

	closeAction : 'hide',

	closable : true,// 是否有关闭

	collapsible : true,// 可折叠

	iconCls : 'bind',

	items : [uploadForm]

});

struts2 action代码

package cn.com.action;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import cn.com.css.common.action.BaseAction;

public class FileUploadAction extends BaseAction {

	private static final long serialVersionUID = 5156288255337069381L;

	private  String msg;

	private String contentType;

	private File docmentFile;

	private String fileName;

	public String upload() throws Exception {

		String realPath = "E:\\" + fileName;

		if (docmentFile.isFile()) {

			BufferedInputStream bis = new BufferedInputStream(

					new FileInputStream(docmentFile));

			BufferedOutputStream bos = null;

			try {

				bos = new BufferedOutputStream(new FileOutputStream(realPath));// 为以防万一，以后写文件的路径尽量写成正双斜杠的

				// 从源文件里取数据，写到目标文件里

				byte[] buff = new byte[8192];

				for (int len = -1; (len = bis.read(buff)) != -1;) {

					bos.write(buff, 0, len);

				}

				bos.flush();

			} catch (IOException ie) {

				ie.printStackTrace();

				msg="文件上传失败";

				HttpServletResponse response = ServletActionContext.getResponse();

				response.setContentType("text/html;charset=UTF-8");

				return "none";

			} finally {

				if (bis != null) {

					try {

						bis.close();

					} catch (IOException ie) {

						ie.printStackTrace();

					}

				}

				if (bos != null) {

					try {

						bos.close();

					} catch (IOException ie) {

						ie.printStackTrace();

					}

				}

			}

		}

		msg="文件上传成功";

		HttpServletResponse response = ServletActionContext.getResponse();

		response.setContentType("text/html;charset=UTF-8");

		return "none";

	}

	public String getFileName() {

		return fileName;

	}

	public void setFileName(String fileName) {

		this.fileName = fileName;

	}

	// since we are using <s:file name="upload" .../> the file name will be

	// obtained through getter/setter of <file-tag-name>FileName

	public String getUploadFileName() {

		return fileName;

	}

	public void setUploadFileName(String fileName) {

		this.fileName = fileName;

	}

	// since we are using <s:file name="upload" ... /> the content type will be

	// obtained through getter/setter of <file-tag-name>ContentType

	public String getUploadContentType() {

		return contentType;

	}

	public void setUploadContentType(String contentType) {

		this.contentType = contentType;

	}

	// since we are using <s:file name="upload" ... /> the File itself will be

	// obtained through getter/setter of <file-tag-name>

	public File getUpload() {

		return docmentFile;

	}

	public void setUpload(File docmentFile) {

		this.docmentFile = docmentFile;

	}

	public String getMsg() {

		return msg;

	}

	public void setMsg(String msg) {

		this.msg = msg;

	}

	public String getContentType() {

		return contentType;

	}

	public void setContentType(String contentType) {

		this.contentType = contentType;

	}

	public File getDocmentFile() {

		return docmentFile;

	}

	public void setDocmentFile(File docmentFile) {

		this.docmentFile = docmentFile;

	}

}

struts.xml配置：

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE struts PUBLIC

        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

        "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

	<package name="documentManage" namespace="/documentManage"

		extends="global-struts-default">

		<action name="upload_*"

			class="cn.com.FileUploadAction"

			method="{1}">

			<result type="json" name="none">

				<param name="contentType">text/html;charset=utf-8</param>

				<param name="excludeProperties">

				    user.myQuestionses,user.messages,user.myNotes,user.taskPapers,

				    user.tasks,user.testPapers,user.articles

  				</param>

			</result>

		</action>

	</package>

</struts>