流程：
在WebContent文件下面建立sum文件夹，再在这里面新建form.jsp和result.jsp页面,在
form.jsp:
<body>
<span style="white-space:pre"> </span>//是项目名加资源路径 <form action="/Web/SumServlet" method="post"> 整数a:<input type="text" name="a" /> <br /> 整数b:<input type="text" name="b" /> <br /> <input type="submit" value="提交" /> </form> </body>
SumServlet:
package sum;
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;
@WebServlet("/SumServlet")
public class SumServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// String a2 = request.getParameter("a");
//整形有自动装箱拆箱机制 获取参数a b
int a = Integer.parseInt(request.getParameter("a"));
int b = Integer.parseInt(request.getParameter("b"));
int sum = a + b;
request.setAttribute("sum", sum);
request.getRequestDispatcher("/sum/result.jsp").forward(request, response);
}
}
<body>
<%
//应该是获取的属性getAttribute("sum")而非getParameter("sum"),在Servlet里面存储的就是setAttribute("sum",sum)
Integer sum2 = (Integer)request.getAttribute("sum");
//int sum = Integer.parseInt(request.getParameter("sum"));//错误的，获取参数应该是用户提交的表单
%>
<%=sum2 %>
</body>原文：http://blog.csdn.net/u012110719/article/details/44648083