文件上传

jsp页面

<tr>
<td colspan="3" class=" xyz-field-collapse">
<div>
<div class="uploadPanel">
<a href="#" id="attachAddLink" class="underline-link attach-add">添加附件</a>
<div id="attachFile">
<input id="attachFileInfo" name="attachFileInfo" type="file"/>
</div>

<!-- 上传文件游览列表 -->
<ul id="attach_upload_list" style="max-height:150px; overflow-y:auto;"></ul>
</div>
</div>
</td>
<td style="text-align: right;">

<!-- 上传按钮 -->
<div id="attachContractDlgForm_btnUpload" />
</td>
</tr>

js(基于Extjs的文件上传)

//获取文件名
var getFileName = function(str){
var reg = /[^\\\/]*[\\\/]+/g;
var str = str.replace(reg, '');
return str;
};

//文件上传
var uploadFile = function(fileName){
Ext.Ajax.service({
url : SERVICE.UPLOAD_FILE_URL,
jsonData : {},
success : function(jsonSrc){
var data = jsonSrc.getData();
if(data.retCode == '-1') {
Ext.MessageBox.alert("提示", "添加附件失败，原因：" + data.msg);
} else {
var attachDTO = data.dto;
addAttachMap(attachDTO);
appendAttachLink(attachDTO);
}
fileField.reset();
},
failure : function(jsonSrc) {
Ext.MessageBox.alert("提示", "添加附件失败，原因：" + jsonSrc.getMessage());
},
params :{
fileName : fileName,
attachType : attachTypeCombox.getValue()
},
form : "attachContractDlgForm",
isUpload : true
});
};

//添加map
var addAttachMap = function(attachDTO){
var key = attachDTO.fileId;
attachMap.add(key, attachDTO);
};

//添加附件列表节点
var appendAttachLink = function (attachDTO) {
var fileSize = attachDTO.fileSize;
var tpl = new Ext.Template(
'<li fileId="{fileId}">',
'<span >' + attachDTO.fileName + ' (' + fileSize + ')' + '</span>',
'<a href="#" class="del-link">删除 </a>',
'</li>');
tpl.append('attach_upload_list', attachDTO);
Ext.select("#attach_upload_list li[fileId=" + attachDTO.fileId
+ "] > a.del-link").on("click", delAttachEvent);
Ext.get("attach_upload_list").addClass(uploadBorderCls);
};

struts2中的Action代码：
byte[] fileByteData = null;
InputStream in = null;
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
in = attachFileInfo.getInputStream();
byte[] buff = new byte[1024];
int len = 0;
while((len = in.read(buff, 0 ,100)) != -1){
out.write(buff, 0, len);
}
fileByteData = out.toByteArray();  //获取内存缓冲中的数据
} catch (Exception e) {
map.put("retCode", "-1");
map.put("msg", e.getMessage());
e.printStackTrace();
return map;
}finally{
if(out != null){
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(in != null){
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

FileOutputStream fos = null;
BufferedOutputStream bos = null;
try {
//设置文件的大小
Double fileSizeKB = fileSize / 1024.0;
DecimalFormat df = new DecimalFormat("########0.00");    //格式化数据
String fileSizeStr = df.format(fileSizeKB);
dto.setFileSize(fileSizeStr + "KB");

DmStdTrInstrAttachDTO tempDTO = dmStdTrInstrAttachCtrl.addContractDmAttachMgr(sessionId, dto);
//获取文件保存路径
String fileFullPath = path;
File file = new File(fileFullPath);
//文件不存在就创建文件
if(file!= null && !file.exists()){
new File(file.getParent()).mkdirs();
file.createNewFile();
}
fos = new FileOutputStream(file);
bos = new BufferedOutputStream(fos);
//向文件写入数据
bos.write(fileByteData);
bos.close();
fos.close();
return tempDTO;
} catch (Exception e) {
e.printStackTrace();
throw new ShineException(e.getMessage());
}finally{
if(fos != null)
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
if(bos != null)
try {
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}