Java request.getParameter()在servlet中返回空值…不知道出了什么问题
这是我通过输入表单发送数据的html表单Java request.getParameter()在servlet中返回空值…不知道出了什么问题,java,servlets,Java,Servlets,这是我通过输入表单发送数据的html表单 <form role="form" action = "AddServlet" method="GET"> <div class="form-group"> <label for="name" class= "bg-primary">Name</label> <input type="text" class="form-control" name="name" placeholde
<form role="form" action = "AddServlet" method="GET">
<div class="form-group">
<label for="name" class= "bg-primary">Name</label>
<input type="text" class="form-control" name="name" placeholder="Enter name of the book">
</div>
<div class="form-group">
<label for="author" class= "bg-primary">Author</label>
<input type="text" class="form-control" name="author" placeholder="Enter the authors name">
</div>
<div class="form-group">
<label for="count" class= "bg-primary">Count</label>
<input type="number" class="form-control" name="count" placeholder="Enter the number of books">
</div>
<div class="form-group">
<label for="description" class= "bg-primary">Description</label>
<textarea class="form-control" rows="5" name="description" placeholder="Enter book description"></textarea>
</div>
<input type="submit" value = "submit">
</form>
但这是返回空值…不知道这有什么问题…得到了答案…label for=“name”是问题所在…将其删除。。
也许“for=”会造成歧义,因此浏览器无法收集数据请先尝试而不创建新会话和事务-只是检查新会话是否覆盖了原始会话。返回的值是什么?
null
值?请求包含您在html表单中输入的数据。您是否创建了setName(name)、setAuthor(author)在你的课本上?
import java.io.IOException;
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 org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
@WebServlet("/AddServlet")
public class AddServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
String name, author, description, count;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Configuration cfg=new Configuration();
cfg.configure("hibernate.cfg.xml");//populates the data of the configuration file
//creating seession factory object
SessionFactory factory=cfg.buildSessionFactory();
//creating session object
Session session=factory.openSession();
//creating transaction object
Transaction t=session.beginTransaction();
Books b = new Books();
name = request.getParameter("name");
author = request.getParameter("author");
description = request.getParameter("description");
count = request.getParameter("count");
System.out.println(count + "dfghjkls");
b.setName(name);
b.setAuthor(author);
b.setDescription(description);
b.setCount(count);
session.persist(b);//persisting the object
t.commit();//transaction is commited
session.close();
System.out.println("successfully saved");
}
}