<s:file/>多文件上传

       <s:file/>有个属性multiple 在标签上添加这属性<s:file name="" id="" multiple/>这样就能同时选中多个文件来选择上传了

  upload.jsp

                 

                        <s:form action="resourceAction_addExercises" name="exerciseForm" id="exerciseForm" method="post" enctype="multipart/form-data">

                        <input type="file" name="exercise" multiple/>

                      </s:form>

后台Action

              

                     Resource resource[]=new Resource[20];//数组对象

                    private File[] exercise;//上传文件（与标签名一致）

                    private String[] exerciseFileName;//上传文件名
            private String[] exerciseContentType;//上传文件类型

                。。。。。。。。。。。。。分别实现get、set方法

               方法体

   

 try{int i;FileInputStream is=null;FileOutputStream fost=null;for(i = 0;i < exercise.length;i++){ is =  new FileInputStream(exercise[i]);//String root = ServletActionContext.getServletContext().getRealPath("/upload");//得到当前目录下的upload目录的绝对路径 fost = new FileOutputStream(ServletActionContext.getServletContext()   .getRealPath("exercises/" + exerciseFileName[i]));int length = 0;byte[] buffer = new byte[1024];while((length = is.read(buffer))!=-1){fost.write(buffer, 0, length);}ActionContext.getContext().getSession().put("exe", "文件上传成功!");is.close();                       fost.close();                                     }                                        }catch(Exception e){                                                 e.printStackTrace();                                                 return INPUT;                                              }                                         return "toexercise";   }