servlet跳转报错

index.jsp:
------------------------------------------------
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<body>
<a href="a">连接</a>
</body>
</html>
a.servlet:
---------------------------------------------package cn.jbit.servlet;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class a extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
System.out.println("aaaaaaaaaaaaaaaa");
request.getRequestDispatcher("b").forward(request, response);
}
}
----------------------
b.servlet
-------------------
package cn.jbit.servlet;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class b extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html");
System.out.println(1111);
}
}问题:跳转到b.servlet的页面的时候报错:为什么啊 

解决方案 »

  1.   

    看你 web.xml配置与 报错信息 
      

  2.   

    <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <body>
    <form action=a method=get>
    <a href="a">连接</a>
    </form>
    </body>
    </html>
    ——————————-
    a.servlet
    import java.io.PrintWriter;
    import java.io.IOException;import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;public class a extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out=response.getWriter();
        out.println("aaaaaaaaaaaaaaaa");
    request.getRequestDispatcher("b").forward(request, response);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException 
    {
    doGet(request,response);
    }
    }
    ------------------------
    b.servlet
    import java.io.IOException;
    import java.io.PrintWriter;import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;public class b extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {response.setContentType("text/html");
    PrintWriter out=response.getWriter();
    out.println(1111);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException
    {
    doGet(request,response);

    }
    }
    ---------------------
    web.xml
    <servlet-name>a</servlet-name>
      <servlet-class>a</servlet-class>
     </servlet>
      <servlet-mapping>
      <servlet-name>a</servlet-name>
      <url-pattern>/a</url-pattern>
     </servlet-mapping>
     <servlet>
      <servlet-name>b</servlet-name>
      <servlet-class>b</servlet-class>
     </servlet>
      <servlet-mapping>
      <servlet-name>b</servlet-name>
      <url-pattern>/</url-pattern>
     </servlet-mapping>
    --------
    使用myeclipse 8.5开始是报405错误
      

  3.   

    <servlet>
    <servlet-name>a</servlet-name>
      <servlet-class>a</servlet-class>
     </servlet>
      <servlet-mapping>
      <servlet-name>a</servlet-name>
      <url-pattern>/a</url-pattern>
     </servlet-mapping>
     <servlet>
      <servlet-name>b</servlet-name>
      <servlet-class>b</servlet-class>
     </servlet>
      <servlet-mapping>
      <servlet-name>b</servlet-name>
      <url-pattern>/</url-pattern>
     </servlet-mapping>
      

  4.   

    <servlet-name>b</servlet-name>
     <url-pattern>/</url-pattern>
    这个地方有问题啊
      

  5.   

    应该在doGet里面调用doPost，request.getRequestDispatcher("b").forward(request, response);写在doPost里面，再试试
      

  6.   

      <servlet-class>cn.jbit.servlet.a</servlet-class>
    包名没加