Jsp和Servlet分工之求a+b的和

水深无声 2022-08-07 08:45 163阅读 0赞

流程：

![Center][]

![Center 1][]

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);
    	}
    
    }

result.jsp:

[Center]: /images/20220805/f55e2538f4a74ce48d84bf9874422ac4.png
[Center 1]: /images/20220805/c4a5a613cfca4c3398c0a236fd3e6d2d.png