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我把上传的方法写在 action里面 单个图片上传没问题 批量上传根本进不去方法 请哪位高手帮忙看看

页面调用
var editor;
 KindEditor.ready(function(K) {
      editor = K.create('textarea[name="111"]', {
   cssPath : '/components/kindeditor-4.1.3/plugins/code/prettify.css',
   uploadJson : '/userGroup/grouppost_uploadImage.action',
   allowFileManager : true,
   items:[
           'justifyleft', 'justifycenter', 'justifyright',
           'justifyfull', 'insertorderedlist', 'insertunorderedlist', 'indent', 'outdent',
           '|', 'formatblock', 'fontname', 'fontsize', '|', 'forecolor', 'hilitecolor', 'bold',
           'italic', 'underline', '|', 'image', 'multiimage'
   ],
   afterCreate : function() {
    var self = this;
    K.ctrl(document, 13, function() {
     self.sync();
     document.forms['example'].submit();
    });
    K.ctrl(self.edit.doc, 13, function() {
     self.sync();
     document.forms['example'].submit();
    });
   }
  });
 });
action 方法
public String uploadImage(){
  JSONObject json=new JSONObject();
  List<String> arr = new ArrayList<String>();
        try {
         if(imgFile != null){
       // 上传文件
       for (int i = 0; i < imgFile.size(); i++) {

        //这里是生成图片的方法
        String imgPath=imageExecute(imgFile.get(i),imgFileFileName.get(i));
        arr.add(imgPath);
       }
         }
  } catch (Exception e) {
   e.printStackTrace();
  }
        json.put("error", 0);
        for(int i = 0; i < arr.size(); i++){
         json.put("url", arr.get(i));
        }
        return renderText(json.toString());
 }