struts2的ajax提交表单文件,Struts2接收formData类型的ajax文件上传，属性可以传过去，文件就报错。...

接收文件就报错

接收普通属性没有问题

报错：

public String save_category() {

System.out.println("name:" + category.getCategory_name());

System.out.println("rank:" + category.getCategory_rank());

System.out.println("show:" + category.getCategory_show());

System.out.println("news:" + category.getCategory_news());

System.out.println("father:" + category.getCategory_father());

/*

*

*/

// http_response.setCharacterEncoding("utf-8");

// 1、创建一个DiskFileItemFactory工厂

DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory();

// 2、创建一个文件上传解析器

ServletFileUpload servletFileUpload = new ServletFileUpload(diskFileItemFactory);

// 解决上传文件名的中文乱码

// servletFileUpload.setHeaderEncoding("UTF-8");

System.out.println("asdqqqqqasdasds");

try {

// 1. 得到 FileItem 的集合 items

List list_fileItems = servletFileUpload.parseRequest(http_request);

// 2. 遍历 items:

for (FileItem fileItem : list_fileItems) {

// 若是一个一般的表单域, 打印信息

if (fileItem.isFormField()) {

System.out.println(fileItem.getFieldName());

switch (fileItem.getFieldName()) {

case "category.category_name": {

break;

}

}

System.out.println(fileItem.getFieldName() + ": " + fileItem.getString("utf-8"));

}

// 若是文件域

else {

String fileName = fileItem.getName();

long sizeInBytes = fileItem.getSize();

System.out.println("原文件名fileName:" + fileName);

System.out.println("sizeInBytes:" + sizeInBytes);

if (sizeInBytes != 0) {

String[] fileNameArray = fileName.split("\.");

System.out.println("fileNameArray.length:" + fileNameArray.length);

System.out.println("fileNameArray[0]:" + fileNameArray[0]);

System.out.println("fileNameArray[1]:" + fileNameArray[1]);

category.setCategory_img(uuid.getUuid() + "." + fileNameArray[1]);

System.out.println("改名后post_img:" + category.getCategory_img());

InputStream inputStream = fileItem.getInputStream();

byte[] buffer = new byte[1024];

int lenth = 0;

String filePath = "F:\xxyjsjgcxy_img\snews_category\" + category.getCategory_img();// 文件最终上传的位置

System.out.println(filePath);

OutputStream outputStream = new FileOutputStream(filePath);

while ((lenth = inputStream.read(buffer)) != -1) {

outputStream.write(buffer, 0, lenth);

}

outputStream.close();

inputStream.close();

} else {

category.setCategory_img(null);

}

}

}

} catch (Exception e) {

e.printStackTrace();

}

/*

* 处理其他数据

*/

// page = "page_list_category";

// ActionContext.getContext().getValueStack().push(page);

return "save_category";

}

调试一下午无果，望各位指点一二