body.jsp是空白的

if (method.equals("add")) {
try {
//把浏览器带过来的数据封装到bean中
Category category = WebUtils.request2Bean(request, Category.class);
category.setId(WebUtils.makeId());
service.addCategory(category);
request.setAttribute("message", "添加分类成功!");
} catch (Exception e) {
request.setAttribute("message","添加分类失败");
e.printStackTrace();
}
request.getRequestDispatcher("/message.jsp").forward(request, response);
} 
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