struts2+jquery+ajax实现上传&&校验实例

一直以为ajax不能做上传,直到最近看了一些文章。需要引入AjaxFileUploaderV2.1.zip,下载链接:http://pan.baidu.com/s/1i3L7I2T

　 代码和相关配置如下：

js代码：

　　　　　　

<script>

//ajax 无刷新上传文件
function ajaxFileUpload() {
//判断是否选择文件
if($("#uploadFile").val() == null || $("#uploadFile").val()==""){
alert("请选择需要上传的文件!");
return;
}
//判断后缀名
var filepath=$("#uploadFile").val();
var extStart=filepath.lastIndexOf(".");
var ext=filepath.substring(extStart,filepath.length).toUpperCase();
if(".xls".toUpperCase() !=ext ){
alert("只能上传Excel97-2003工作簿文件(xls)");
return false;
}
//判断文件大小
var file = $('#uploadFile').get(0).files[0];
if (file) {
var fileSize = 0;
if (file.size > 2*1024 * 1024) {
alert("上传的文件大小不能超过2MB,请核对后重试!");
return false;
}
}
$("#loading")
.ajaxStart(function () {
$(this).show();
})//开始上传文件时显示一个图片
.ajaxComplete(function () {
$(this).hide();
});//文件上传完成将图片隐藏起来

$.ajaxFileUpload
(
{
url: '<%=request.getContextPath()%>/server/doUploadAndInsert.action',//用于文件上传的服务器端请求地址
secureuri: false,//一般设置为false
fileElementId: 'uploadFile',//文件上传空间的id属性  <input type="file" id="file" name="file" />
dataType: 'json',//返回值类型 一般设置为json
success: function (result) {
var msgBean = result;
alert(msgBean.msgText);
}
});
return false;

}
</script>

需要导入jquery星河ajaxfileupload.js,html代码：

<script src="<%=request.getContextPath()%>/plugin/jquery/jquery-1.7.2.min.js"></script>
<script src="<%=request.getContextPath()%>/plugin/jquery/jquery-ui.min.js"></script>
<script src="<%=request.getContextPath()%>/plugin/jquery/jquery.validate.min.js"></script>
<script src="<%=request.getContextPath()%>/plugin/jquery/jquery.metadata.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/js/ajaxfileupload.js"></script>

<div id="page-content" class="clearfix" style="padding-top: 20">
<form id="myform" enctype="multipart/form-data" method="post"
action="<%=request.getContextPath()%>/server/doUploadAndInsert.action">
<span style="font-size: 15px;">        
选择文件<span style="color: #c91523">(*.xls格式)</span>： </span>
<input id="uploadFile" type="file" style="font-size: 15px" label="浏览" name="uploadFile" accept="application/xls"></file>
</form>
<input type="button" style="margin: 0 0 20 370;font-size: 15px" class="btn btn-large btn-pink save-right"
value="导入" onclick="return ajaxFileUpload();"/>
</div>

struts2 配置：

<package name="server" extends="interceptorPackge" namespace="/server">
<action name="doUploadAndInsert" class="serverBaseInfoAction" method="doUploadAndInsert" >
<result type="plainText" />
<param name="savePath">uploadTemp</param>
</action>
</package>

后端struts2 action代码：

// 上传文件所需属性
private String title;
private File uploadFile;
private String uploadFileContentType;
private String SavePath;
private String uploadFileFileName;
Log log = LogFactory.getLog(this.getClass());public String doUploadAndInsert() throws Exception {
PrintWriter out = null;
MsgBean msg = new MsgBean();
try {
HttpServletResponse response = ServletActionContext.getResponse();
response.setContentType("text/html;charset=utf-8");
out = response.getWriter();
if(getUploadFile().length()>2097152){
msg.setMsgName("SysDefectAction_doDefUploadAndInsert_fail");
msg.setMsgText(getUploadFileFileName()+"上传失败,文件太大。\r\n请不要上传超过2048KB的文件");
out.write(JSON.toJSONString(msg));
out.flush();
return null;
}
//后缀名限制
String suffixName = getUploadFileFileName().split("\\.")[1];
if(!"xls".equalsIgnoreCase(suffixName)){
msg.setMsgName("SysDefectAction_doDefUploadAndInsert_fail");
msg.setMsgText(getUploadFileFileName()+"上传失败,错误的文件格式!");
out.write(JSON.toJSONString(msg));
out.flush();
return null;
}

UUID uuid = UUID.randomUUID();
ServletContext servletContext = (ServletContext) ActionContext.getContext().get(ServletActionContext.SERVLET_CONTEXT);
String rootPath = servletContext.getRealPath("/");
File folder = new File(rootPath + "\\" + getSavePath());
if (!folder.exists()) {
folder.mkdir();
}
FileOutputStream fileOutputStream = new FileOutputStream(rootPath + "\\" + getSavePath() + "\\" + uuid+"_"+getUploadFileFileName());
FileInputStream fileInputStream = new FileInputStream(getUploadFile());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fileInputStream.read(buffer)) > 0) {
fileOutputStream.write(buffer, 0, len);
}
fileInputStream.close();
log.info("上传文件接收成功,文件存放全路径为:" + rootPath + "/" + uuid+"_"+getUploadFileFileName());

} catch (Exception e){
msg.setMsgName("SysDefectAction_doDefUploadAndInsert_fail");
msg.setMsgText(getUploadFileFileName()+"上传失败,"+e.getMessage());
out.write(JSON.toJSONString(msg));
out.flush();
} finally{
out.close();
return null;
}

}