C/C++语句笔记,持续更新中……

jsp页面
<div class="picture">
<input id="uid" type="hidden">
input type="file" name="file" id="fn" onchange="select_img();">
<img id='target' class="popup" style="width:143px;height:190px;display:none;" />
引用的js
jquery.ajaxfileupload.js
js代码

$(function () {
$('input[type=text]').validatebox();
});
function uploadP(id){
$("#uid").val(id);
$("#uploadpictrue").dialog("open");
}
function select_img() {
var id=$("#uid").val();
var value = $("#fn").val();
var ext = value.substring(value.lastIndexOf(".") + 1).toLowerCase();
if (ext == null
|| ext == ""
|| (ext != "jpg" && ext != "gif" && ext != "bmp" && ext != "jpeg" && ext != "png")) {
$.messager.alert("操作提示", "图片格式错误","info");

} else{
$.ajaxFileUpload({
url : "<%=basePath%>uploadImgFile.html?id="+id,
secureuri : false,// 一般设置为false
fileElementId : 'fn',// 文件上传空间的id属性
dataType : 'text',// 返回值类型 一般设置为json
success : function(data,status) // 服务器成功响应处理函数
{
var path=data.substring(8,data.length-3);
if(path=="fail1"){
$("#fn").val("");
$.messager.alert("操作提示", "文件超过4MB，请您重新上传","info");

}else{
$("#target").attr("src", getRootPath() + data);
$("#btnl").css("display","block");
$("#target").css("display","block");
}
},

error : function(data,status,e)// 服务器响应失败处理函数
{
$.messager.alert("操作提示", e,"info");
}
});
}
}

function getRootPath() {
// 获取当前网址，如： http://localhost:8083/uimcardprj/share/meun.jsp var curWwwPath = window.document.location.href;
// 获取主机地址之后的目录，如： uimcardprj/share/meun.jsp
var pathName = window.document.location.pathname;
var pos = curWwwPath.indexOf(pathName);
// 获取主机地址，如： http://localhost:8083 var localhostPaht = curWwwPath.substring(0, pos);
// 获取带"/"的项目名，如：/uimcardprj
var projectName = pathName
.substring(0, pathName.substr(1).indexOf('/') + 1);
return (localhostPaht + projectName) + "/";
}

后台代码

@SuppressWarnings("unchecked")
@RequestMapping(value = "/uploadImgFile.html")
public @ResponseBody void uploadImgFile(HttpServletRequest request,
HttpServletResponse response,
@RequestParam("file") MultipartFile file,int id)
throws Exception {
JSONObject jsonObject=new JSONObject();
//文件大小
double fileSizeDouble = get2Double(((double) file.getSize() / 1024) / 1024);
String fileSize = fileSizeDouble + "MB";
if (fileSizeDouble > 4.0) {
jsonObject.put("msg", "fail1");
// ResponseUtil.write(response, jsonObject);
}else {

String sql="from TabExpert te where te.expertid='"+id+"'";
TabExpert tabExpert=tabExpertSercive.getTabExpertListByHql(sql).get(0);
String msg="";
// 获取当期时间，作为文件名，避免重复
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
String fileTime = sdf.format(new Date());

String fileName = file.getOriginalFilename();
System.out.println(fileName);
String type = fileName.substring(fileName.lastIndexOf(".") + 1);
/*if (fileName.length() > 0) {
if (!type.equals("jpg") && !type.equals("bmp")
&& !type.equals("gif") && !type.equals("png")
&& !type.equals("jpeg")) {
jsonObject.put("msg","图片格式错误");

}
}else{
*/
// 上传的文件放在“realPath”目录下
String realPath1 = request.getSession().getServletContext()
.getRealPath("houtai/image/" + fileTime);
if ((new File(realPath1).isDirectory())) {
System.out.println("文件夹已存在！创建失败！");

} else {
new File(realPath1).mkdir();
System.out.println("创建文件夹成功！");

}

if (fileName.length() > 0) {
// 存入照片
FileUtils.copyInputStreamToFile(file.getInputStream(), new File(
realPath1, fileName));
// 相片路径
String realPath = realPath1 + "\\" + fileName;

System.out.println("========================================");

// 将文件名存入数据库
// realPath=realPath+"\\"+fileName;
int beginIndex = realPath.lastIndexOf("houtai");
realPath = realPath.substring(beginIndex, realPath.length());
tabExpert.setExt0(realPath.replace("\\", "/"));
tabExpert.setExt1(fileName);
try {
tabExpertSercive.updateTabExpert(tabExpert);
msg=tabExpert.getExt0();
ResponseUtil.write(response,msg);
jsonObject.put("msg",tabExpert.getExt0());
System.out.println(tabExpert.getExt0());
} catch (Exception e) {
// TODO: handle exception
jsonObject.put("msg", "上传失败！");
}

}
/*}*/
}

ResponseUtil.write(response, jsonObject);

}