ajaxfileupload+struts2文件上传、下载

前台页面：

html：

<input id="uploadToImportFile" type="file" name="file" style="width:200px;"/><input input type="button" value="上传" onclick="contactAjaxFileUpload(this)"/>

JS：

               //验证文件类型                function isLegalFiletype(filename) {            var pattern = /(.jpg|.zip|.html|.htm)$/;            if (!pattern.exec(filename)) {            alert("文件格式不正确!");            return false;            }            return true;            }            function contactAjaxFileUpload(obj) {            if (isLegalFiletype($("#uploadToImportFile").val())) {            $.ajaxFileUpload({            url : '<%= request.getContextPath()%>/userinfo/fileupload!upload.do', //服务器地址            secureuri : false,// 一般设置为false            fileElementId : 'uploadToImportFile', // 文件上传控件的id属性 <input            dataType : 'json',            //可携带参数 data:{"type":type},            success : function(data) { // 服务器成功响应处理函数            if(data.success){            }else{            alert(data.message);            }            return;            },            error : function(data, e) {            alert("上传失败 "+e);            return;            }            });            }            }                //文件下载                function getFile(filename){    if(filename!=null&&filename!=''){        window.open(encodeURI("<%= request.getContextPath()%>/userinfo/fileupload!getFj.do?filename="+filename));    }else{        alert('文件不存在');    }}

后台Action

public class FileUploadAction extends SimpleActionSupport{/** *  */private static final long serialVersionUID = -2542938870216611337L;private String sp = File.separator;private File file;private String fileFileName;private String fileFileContentType;private String message = "上传失败";    public String getMessage() {     return message;}    public void setMessage(String message) {        this.message = message;    }    public File getFile() {        return file;    }    public void setFile(File file) {        this.file = file;    }    public String getFileFileName() {        return fileFileName;    }    public void setFileFileName(String fileFileName) {        this.fileFileName = fileFileName;    }    public String getFileFileContentType() {        return fileFileContentType;    }    public void setFileFileContentType(String fileFileContentType) {        this.fileFileContentType = fileFileContentType;    }    @SuppressWarnings({ "deprecation", "resource" })    public void upload() throws Exception {    response.setContentType("text/html;charset=UTF-8");Map<String, Object> result = new HashMap<String, Object>();             try {            File f = this.getFile();            FileInputStream fis = new FileInputStream(f);            int a = fis.available();            if(a>2097152){            message="对不起,请上传少于2M的文件!!!";result.put("success", false);result.put("message", message);response.getWriter().print(JSONObject.fromObject(result));                return;            }            if(this.getFileFileName().endsWith(".exe")){                message="对不起,你上传的文件格式不允许!!!";result.put("success", false);result.put("message", message);response.getWriter().print(JSONObject.fromObject(result));                return;            }            String p =sp+userinfoId+sp;            File ff = new File(path+p);            if(!ff.exists()){            ff.mkdirs();            }            String pp = p+new Date().getTime()+this.getFileFileName().substring(this.getFileFileName().lastIndexOf("."));                       FileInputStream inputStream = new FileInputStream(f);            FileOutputStream outputStream = new FileOutputStream(path+pp);            byte[] buf = new byte[1024];            int length = 0;            while ((length = inputStream.read(buf)) != -1) {                outputStream.write(buf, 0, length);            }            inputStream.close();            outputStream.flush();            result.put("success", true);result.put("id", id);response.getWriter().print(JSONObject.fromObject(result));        } catch (Exception e) {            e.printStackTrace();            result.put("error", true);result.put("message", message);response.getWriter().print(JSONObject.fromObject(result));            return;        }    }        //文件下载    @SuppressWarnings("resource")  public void getFj(){      try {          String filename = request.getParameter("filename");//文件路径          File f = new File(filename);          if(f.exists()){          response.setContentLength((int)f.length());  String parameter = "filename=" + f.getName();  response.setHeader("Content-disposition", new String(parameter.getBytes("GB2312"), "ISO8859_1"));  OutputStream os = response.getOutputStream();  FileInputStream fis= new FileInputStream(f);  byte[] b = new byte[512];  int length;  while((length = fis.read(b)) > 0){  os.write(b, 0, length);  }  os.flush();  os.close();          }else{          JsonResult.err("文件不存在");          return ;          }      } catch (Exception e) {      JsonResult.err(e.getMessage());  }        }}