我做了三个Servlet，第一个是一个登陆界面，第二个是一个控制器，第三个是一个主界面，控制器判断提交用户名和密码后，选择重定向的页面，三个Servlet代码如下，出现了500错误，就是提交用户名和密码后，出现了500错误，而且只能跳转到控制器那个Servlet，希望能告诉我到底出现了什么错误，先谢了
public class LoginServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//处理字符编码
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
//返回一个界面
out.println("<h1>用户登录</h1>");
out.println("<form action='/UserManager/LoginCLServlet' method='post'>");
out.println("用户名:<input type='text' name='username'><br/>");
out.println("密 码:<input type='password' name='password'><br/>");
out.println("<input type='submit' value='登录' /><br/>");
out.println("</form>");
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}public class LoginCLServlet extends HttpServlet {
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
String password = request.getParameter("password");
if("梁维伟".equals(username) && "123".equals(password)){
response.sendRedirect("/UserManager/MainFrame");
}
else{
response.sendRedirect("/UserManager/LoginServlet");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}public class MainFrame extends HttpServlet {
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
out.println("<h1>主界面</h1>");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}------解决思路----------------------
断点跟进去看看哪里出的错？
------解决思路----------------------
com.vv.view.LoginCLServlet
这个是你自己写的类？
看看这个类编译好了没