ajax做上载验证与上载
日期：2014-05-16 浏览次数：20700 次
ajax做下载验证与下载
下载 ：
? jsp页面
<%String productId = request.getParameter("productId") == null ? "" : request.getParameter("productId");%>
<HTML>
<HEAD>
<TITLE></TITLE>
</HEAD>
<BODY topmargin="10px">
<form action="" name="downloadstrufile">
<input type="hidden" name="packageId1" value="<%=productId%>">
</form>
</BODY>
<script language="javascript">
<%-- 下载文件 --%>
function forStruDown(){
var url="<%=request.getContextPath()%>/compressFilesForm/new_downloadCompressedFile_validate.so";
var param="packageId1=<%=productId%>";
var myAjax=new Ajax.Request(url,{method:'post',parameters:param,onSuccess:doStruDown,asynchronous:true});
}
var doStruDown=function(text){
var returnvalue = text.responseText;
if(returnvalue == "1"){
var url = "<%=request.getContextPath()%>/compressFilesForm/new_downloadCompressedFile.so";
document.forms["downloadstrufile"].action = url;
document.forms["downloadstrufile"].submit();
}else if(returnvalue == "0"){
alert("文件不存在！");
}
}
</script>
</HTML>
?后台java
验证文件是否存在
public void new_downloadCompressedFile_validate(WebContext context) {
HttpServletRequest request = (HttpServletRequest)context.get(WebcConstant.Param_Request);
FileInputStream in = null;
String flag = "1";
try {
String packageId = getParameter("packageId1", context);
List daoList = searchFileType(packageId);
String sql = " ";
List<String> files = hibernateDao.executeSqlQuery(sql);
for (String file : files) {
in = new FileInputStream(dataFilePath +"temp/zip/"+ file);
}
} catch (Exception e) {
flag ="0";
}
HttpServletResponse rep = WebcUtils.getResponse(context);
ForwardSpecification fs = new ForwardSpecification();
fs.setType(ForwardView.ajaxType);
ForwardView view = new SimpleForwardViewImpl();
try {
view.forward(flag, request, rep, fs);
} catch (Exception e) {
}
finally {
if (in != null) {
try {
in.close();
in = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
?
下载方法 //流
public void new_downloadCompressedFile(WebContext context) {
if("yes".equals(getParameter("all", context))){
downloadCompressedFileByObject(context);
return;
}
FileInputStream in = null;
try {
HttpServletResponse response = WebcUtils.getResponse(context);
String packageId = getParameter("packageId1", context);
String sql = "" ;
List<String> files = hibernateDao.executeSqlQuery(sql);
String file = SpoilageMgrUtils.notEmptyStr(files);//查询一列
if(StringUtils.isNotBlank(file)){
String exportedFileName =file;
in = new FileInputStream(dataFilePath +"temp/zip/"+ file);
// 设置输出的格式
response.reset();
response.setContentType("text/html;charset=GBK");
response.addHeader("Content-Disposition", "attachment; filename="
+ java.net.URLEncoder.encode(exportedFileName, "UTF-8"));
// 循环取出流中的数据
byte[] b = new byte[1024];
int len;
while ((len = in.read(b)) > 0) {
response.getOutputStream().write(b, 0, len);
}
response.getOutputStream().flush();
response.getOutputStream().close();
}
} catch (Exception e) {
SgLoger.writeErrorInfo(this.getClass(), "new_downloadCompressedFile", e);
} finally {
if (in != null) {
try {
in.close();
in = null;
} catch (Exception e) {
SgLoger.writeErrorInfo(this.getClass(), "new_downloadCompressedFile", e);
}
}
}
}
?
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