extjs3.2+struts1.2实现文件上传。

ext form表单代码：



var addDoc = new Ext.FormPanel({
        baseCls:         'x-plain',
        autoWidth:        false,
        labelWidth:     100,
        labelAlign :     'right',
        bodyStyle :         'padding-top:5px',
        defaultType:     'textfield',
        defaultWidth:     '150',
        items:[{
fieldLabel:     '*主题名称',
            id:                'theme',
            anchor:            '90%',
            name:             'theme',
            maxLength:        100,
            maxLengthText:    '长度不能超过100个字符',
            minLength:        2,
            minLengthText:    '长度不能小于2个字符',
            allowBlank:        false,
            blankText:        '请输入模块名称'
        },{
        xtype:           'datefield',
fieldLabel:     '*截止日期',
            id:                'expireTime',
            anchor:            '90%',
            name:             'expireTime',
        format:             'Y-m-d', 
            allowBlank:        false,
            blankText:        '请选择截止日期'
        },{
fieldLabel:     '创建者',
            id:                'person1',
            anchor:            '90%',
            name:             'person1',
            value:            '${LOGIN.person.name}',
            maxLength:        20,
            maxLengthText:    '长度不能超过20个字符',
            minLength:        2,
            minLengthText:    '长度不能小于2个字符',
            allowBlank:        false
        },{
        xtype:                'textarea',
        anchor:            '90%',
            id:                    'description',
            name:                'description',
            maxLength:            200,
            maxLengthText:        '长度不能超过200个字符',
            fieldLabel:         '主题描述',
            height:30,
            anchor: '90%'  // anchor width by percentage and height by raw adjustment

        },{
            id:                'docType1',
            anchor:            '90%',
            fieldLabel:        '附件类型',
            name:            'docType1',
            xtype:   'combo',
     bodyStyle:         'padding:10px;',
            valueField:        "value",
            emptyText:        '请选择附件类型',
            blankText:        '请输入附件类型',
           displayField:    "text",
            allowBlank:        false,
           store:new Ext.data.SimpleStore({
fields: ["value", "text"],
data: [['1','Word主题'],['xls','Excel主题'],['jpg','JPG图片'],['jpeg','JPEG图片'],['gif','GIF图片'],['bmp','BMP图片'],['7','视频图像']]
}),
           mode:             'local'

        },{
        fieldLabel:        '*上传附件(2M)',
        id:                 'file-file',
        name:              'file',  
        itmesCls:           'float-left',
        clearCls:            'allow-foat',
        //fileUpload :           true,       // 指定表单将要进行文件上传
        anchor:            '90%',
            xtype:             'textfield',
            inputType:          'file',//输入类型
          listeners:{
          blur:function(){
          var file_upl = document.getElementById('file-file'); 
          file_upl.select();
          var filePath = document.selection.createRange().text;  //获取上传文件路劲
          if(filePath!=""){
var path_name=filePath.substr(filePath.lastIndexOf("\\")+1,filePath.length-1);//获取上传文件名
var fileType=filePath.substr(filePath.lastIndexOf(".")+1,filePath.length-1);//获取上传文件类型
var doc_type= Ext.getCmp("docType1").getValue();  //获取上传文件类型
if(doc_type==1){
if(fileType.toLowerCase() !="doc" && fileType.toLowerCase()!="docx"){
Ext.Msg.alert("提示信息","  上传文件格式不正确");
return;
}
}
if(doc_type!=1 && doc_type!=7){
if(fileType.toLowerCase() !=doc_type){
Ext.Msg.alert("提示信息","  上传文件格式不正确");
return;
}
//未验证视频格式

}
Ext.getCmp("accessory1").setText("<font color='red'>"+path_name+"</font>",false);  //模板文件名称赋值
Ext.getCmp("accessory").setValue(path_name);  //模板文件名称赋值
Ext.getCmp("docType").setValue(doc_type);  //模板文件类型赋值
Ext.getCmp("file").setValue(filePath);  //模板文件类型赋值


          }
          }
    
          }

        },{
        xtype:            'label',
fieldLabel:     '模板文件',
            id:                'accessory1',
           anchor:            '90%',
           name:             'accessory1',
            allowBlank:        false
        }, {
        xtype: 'radiogroup',  
            fieldLabel: '公开/私密', 
            anchor:     '60%',
            name: 'rbauto',  
           items: [          
           {boxLabel: '公开', name: 'rbauto', inputValue: 1},         
           {boxLabel: '私密', name: 'rbauto', inputValue: 0, checked: true}          
           ]
  },{
        //隐藏文本框赋值，上传文件类型

            id:                'docType',
           hidden:             true,
           name:             'docType'
      
        },{
        //隐藏文本框赋值,上传文件名

            id:                'accessory',
           hidden:             true,
           name:             'accessory'
      
        },{
        //隐藏文本框赋值,用户ID

            id:                'person',
           hidden:             true,
           name:             'person',
           value:              '${LOGIN.id}'
      
        }],
       
         buttons: [{
            text: '保存˜',
            handler:function(){
            if(addDoc.form.isValid()){
                          Ext.MessageBox.show({
                               title:         '提示',
                               msg:         '正在保存...',
                               progressText: '',
                               width:        300,
                               progress:    true,
                               closable:    false,
                               animEl:         'loding'
                           });
                           var f = function(v){
                             return function(){
                                        var i = v/11;
                                        Ext.MessageBox.updateProgress(i, '');
                                    };
                           };

                           for(var i = 1; i < 13; i++){
                                setTimeout(f(i), i*150);
                           }

                          addDoc.form.doAction('submit',{
                             url:'docSendManager.do?method=saveAndUpdateDoc',
                             method:'post',
                             success:function(form,action){
                                    if (action.result.msg=='ok') {
                                        addDoc.form.reset();
                                        addDocWindow.hide();
                                        Ext.MessageBox.hide();
                                        Ext.Msg.alert('操作提示žœ',"保存成功ŠŸ");
                                       reloadTreeAndGrid();
                                    } else {
                                        Ext.Msg.alert('操作提示',action.result.msg);
                                    }
                             },
                             failure:function(){
                                    Ext.Msg.alert('操作提示','服务器错误，请稍后再试...');
                             }
                          });
            }
            }
           
        },{
            text: '重置',
            handler:function(){addDoc.form.reset();}
        }
        
              ]
});





actionfrom部分代码：


/**
* 稿件模板附件引用相对路径
*
* @hibernate.property
*/
private FormFile file;

private String expireTime;//截止时间

private String description;// 主题描述

private String rbauto;//公开/私密状态

private String person;  //用户


public FormFile getFile() {
return file;
}

public void setFile(FormFile file) {
this.file = file;
}

public String getPerson() {
return person;
}

public void setPerson(String person) {



action部分代码

public ActionForward saveAndUpdateDoc(ActionMapping mapping,
ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception {
   response.setContentType("text/html");
   // 设置字符编码为UTF-8, 这样支持汉字显示
   response.setCharacterEncoding("UTF-8");
  
FileManagerForm fileManager = (FileManagerForm) form;
FormFile pfile = fileManager.getFile();//获取文件路径
String docName=fileManager.getTheme();//主题名
String endTime=fileManager.getExpireTime();// 截止日期
String dec=fileManager.getDescription();//描述
String doctype=fileManager.getDocType();//附件类型
String accessory=fileManager.getAccessory();//附件名称
int rbauto=Integer.parseInt(fileManager.getRbauto());//公开/私密
int person=Integer.parseInt(fileManager.getPerson());// 用户ID
System.out.println("文件路径:"+pfile);
System.out.println("主题名:"+docName);
System.out.println("截止日期:"+endTime);
System.out.println("描述:"+dec);
System.out.println("附件类型:"+doctype);
System.out.println("附件名称:"+accessory);
System.out.println("公开/私密"+rbauto);
System.out.println("用户ID"+person);

Object logger;

FormFile file = fileManager.getFile();
String tmpFolder = "";
String extName = "";
String fullPath = "";

if (null != file && !"".equals(file.getFileName())) {
String contentType = file.getContentType();

String size = (file.getFileSize() + "bytes");
String fileName = file.getFileName();
extName = fileName.split("\\.")[1];
tmpFolder = String.valueOf(System.currentTimeMillis());
fullPath = "/photo/templates/" + tmpFolder + "/" + fileName;

try {
String filePath = "";// 取当前系统路径
if (new File("d:\\photo").isDirectory()) {
filePath = "d:\\";
} else {
filePath = request.getRealPath("/");
}
File mDir = new File(filePath + "/photo/templates/"
+ tmpFolder);
if (!mDir.isDirectory()) {
mDir.mkdirs();
}

InputStream stream = file.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStream bos = new FileOutputStream(filePath + fullPath);
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) {
bos.write(buffer, 0, bytesRead);// 将文件写入服务器
}
bos.close();
stream.close();
} catch (Exception e) {
log.error("上传出现异常");
}


打印结果：：

文件路径:null
主题名:111111
截止日期:2012-03-17
描述:1111111
附件类型:1
附件名称:四川电大毕业设计.doc
公开/私密0
用户ID2026


请问。。为什么file为null呀？？

我换成File接收也是null、。、

网上查说将：fileUpload :           true

但是这样也不行。。。

在aip中，也没有找到fileUpload 属性

还有的说将:xtype:'uploadPanel'

同样，，在3.2的api中也xtype没有发现有这个属性。

请问应该怎么样，才能