需要导入:jar包
html/jsp代码
form表单中method必须设置为post,并且要设置enctype=”multipart/form-data”,要提交的inpu标签要设置name属性
<form action="服务器接口" method="post" enctype="multipart/form-data">
文件:<input type="file" name="myfile">
<input type="submit" value="提交">
</form>
servlet代码
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.List;
@WebServlet(name = "HeadServlet",urlPatterns = "/HeadServlet")
public class HeadServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) {
//临时文件/解析工厂
DiskFileItemFactory head = new DiskFileItemFactory();
//解析器
ServletFileUpload upload = new ServletFileUpload(head);
//判断form属性enctype的值是否为multipart/form-data
try {
//用pasreRequest将请求的值封装成fileItem对象然后放在fileItems中
List<FileItem> fileItems = upload.parseRequest(request);
FileItem fileItem = fileItems.get(0);
String fileName = fileItem.getName();
File file = new File("E:\\上传的文件\\" + fileName);
fileItem.write(file);
}catch (Exception e){
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
}