ExtJs框架 文件上传

<!--ExtJs框架开始-->
	<script type="text/javascript"
		src="../../include/Ext/adapter/ext/ext-base.js"></script>
	<script type="text/javascript" src="../../include/Ext/ext-all.js"></script>
	<script src="../../include/Ext/src/locale/ext-lang-zh_CN.js"
		type="text/javascript"></script>
	<link rel="stylesheet" type="text/css"
		href="../../include/Ext/resources/css/ext-all.css" />
	<!--ExtJs框架结束-->	

var file = new Ext.form.TextField({
					name : 'upload',/* name: 'file':名称，重要，因为service端要根据这个名称接收文件 */
					fieldLabel : 'file upload',
					inputType : 'file',
					allowBlank : false,
					blankText : '请浏览文件'
				});
				//提交按钮处理方法
				var btnsubmitclick = function() {
					if (uploadForm.getForm().isValid()) {
						uploadForm.getForm().submit();
						alert("upload success");
					}
				};
				//重置按钮"点击时"处理方法
				var btnresetclick = function() {
					uploadForm.getForm().reset();
				};
				//表单
				var uploadForm = new Ext.form.FormPanel({
					frame : true,
					fileUpload : true,
					url : '/BMS/file/upload',
					items : [ file ],
					buttons : [ {
						text : 'upload',
						handler : btnsubmitclick
					}, {
                    text: 'cancel',
                    handler: btnresetclick
                }]	
    });

items:[	
	uploadForm,								
										
	{
		xtype:'textfield',
		fieldLabel:'建设单位',
		labelAligin:'right',
		name:'buildUnit',
												
	}																												
]

<package name="file" extends="struts-default" namespace="/file">
		<action name="upload" method="upload" class="com.jdwy.action.FileAction">
			<result name="success">/BMS/index.jsp</result>
			<param name="uploadPath">/upload</param>
		</action>
	</package>

package com.jdwy.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.struts2.ServletActionContext;

public class FileAction{
	/**
	 * 
	 */
	private File upload;
	private String uploadFileName;
	public File getUpload() {
		return upload;
	}
	public void setUpload(File upload) {
		this.upload = upload;
	}
	private String uploadPath;
	
	public String upload() throws Exception{
		
		InputStream is=new FileInputStream(upload);
		String path=ServletActionContext.getServletContext().getRealPath(uploadPath);
		OutputStream os=new FileOutputStream(path+"/"+uploadFileName);
		
		byte buffer[]=new byte[1024];
		int cnt;
		while((cnt=is.read(buffer))>0){
			os.write(buffer,0,cnt);
		}
		os.close();
		is.close();
		
		return "success";
	} 
	public String getUploadFileName() {
		return uploadFileName;
	}
	public void setUploadFileName(String uploadFileName) {
		this.uploadFileName = uploadFileName;
	}

	public String getUploadPath() {
		return uploadPath;
	}
	public void setUploadPath(String uploadPath) {
		this.uploadPath = uploadPath;
	}
}