在做文件上传相关表单时发现数据类型转换错误
后面才知道是页面之间无法传值
<form action ="UploadServlet" method = "post" enctype = "multipart/form-data">
<h2>上传作业</h2>
<input type = "text" name="sno" placeholder="学号"/><br/>
<input type = "text" name = "name" placeholder="姓名"/><br/>
<input type = "file" name = "spiature"/>
<input type = "submit" class = "btn" value ="上传"/>
</form>
产生的原因:表单添加enctype = "multipart/form-data"属性之后,表单里的数据会以二进制数据类型进行传输,所以request.getparameter获取的值为null
解决方法:
while(iter.hasNext()) {
FileItem item= iter.next();
String fileName = item.getName();
String itemName = item.getFieldName();
if(item.isFormField()) { //非文件数据的上传
if(itemName.equals("name")){
name = item.getString("utf-8");
}else if(itemName.equals("sno")) {
sno =Integer.parseInt(item.getString("utf-8"));
}else {
system.out.println("其他字段");
}
}else {
//定义上传路径:指定上传的位置
String path = "D:\\upload";
File file = new File(path,fileName);
try {
item.write(file);
} catch (Exception e) {
e.printStackTrace();
}
}
}