异步上传图片

 public void uploadpic() throws Exception{
  ServletActionContext.getResponse().setCharacterEncoding("utf-8");
  //获取session
  admin=(Admin)ServletActionContext.getRequest().getSession().getAttribute("admin");
  String  imgpath="";
  if(file1 != null){
   if(file1.getName().endsWith(".exe")){
    imgpath="对不起,你上传的文件格式不允许!!!";
                ServletActionContext.getResponse().getWriter().print(imgpath);
            }else{
    FileInputStream inputStream = new FileInputStream(file1); //重新解析图片  上传过来的变强制转换为tmp了
    String srcpath = Constants.ADMIN_BUILDJS+"images/tmp/subject_"+file1.getName().replace(".tmp", ".jpg");
    File folder = new File(srcpath.substring(0, srcpath.lastIndexOf("/")));
    if(!folder.exists()){
        folder.mkdirs();
       }
          FileOutputStream outputStream = new FileOutputStream(srcpath);
          byte[] buf = new byte[1024];
          int length = 0;
          while ((length = inputStream.read(buf)) != -1) {
              outputStream.write(buf, 0, length);
          }
          inputStream.close();
          outputStream.flush();
    File newimg = new File(srcpath); 
    imgpath = fileService.uploadPhotoForGuide(newimg, newimg.getName(), new int[] { 600, 200 }, 18, admin.getAdid());
            }
  }
  ServletActionContext.getResponse().getWriter().print(imgpath);
 }

 

 

 

 

 

function uploadpic2(){
  popup("图片上传","<div id='cgong' style='display:none; margin-left: 90px;margin-top: 60px; line-height: 30px;'>" +
   "<span id='sucmsg' style='color:#ff0000;'></span></div><div  id='msgok'></span>" +
   "<input id='file1' type='file' size='31' name='file1'/><br />" +
   "<input type='button' class='upload_btn' style='line-height: 35px; margin-left:200px;margin-top:10px;' value='确认上传' onclick='usubmit2()'/></form>" +
   "</div>",340,150,"");
}
function usubmit2(){
 var s=$("#file1").val();
 if(s!=null && s!=''){
  $.ajaxFileUpload({
    url:"subject!uploadpic.action",
    secureuri:false,
    fileElementId:'file1',
    dataType:"text",
    success: function (r){
     alert(r);
    }
   });
 }else{
  alert('请选择图片文件');
 }
}

 

//校验图片格式
if(/^.*?\.(gif|png|jpg|jpeg|bmp)$/.test(tmpFileValue.toLowerCase())){
return true;
} else {
alert("只能上传jpg、jpeg、png、bmp或gif格式的图片！");
return false;
} 

 

 <script type="text/javascript" src="${jspPath}/js/admin/ajaxfileupload.js"></script>

 

 

 

上面引用的文件  如果你是json 的话  需要对内部进行改造

// Get the JavaScript object, if JSON is used.
        if ( type == "json" )
         data = r.responseText; 
            var start = data.indexOf(">"); 
            if(start != -1) { 
             var end = data.indexOf("<", start + 1); 
               if(end != -1) { 
                 data = data.substring(start + 1, end); 
                } 
            } 
            eval( "data = " + data );
        // evaluate scripts within html