异常一

创建人	李晓东
问题标题	书写错误
问题分类	Web
附件	@WebServlet(name = "responsedemo")   public class responsedemo extends HttpServlet {       protected void doPost(HttpServletRequest request,  HttpServletResponse response) throws ServletException, IOException {           System.out.println("<---demo---> ");           request.setAttribute("msg","response");           response.sendRedirect("/responsedemo2");       }          protected void doGet(HttpServletRequest request,  HttpServletResponse response) throws ServletException, IOException {           this.doPost(request,response);       }   }
问题答案	问题分析:    @WebServlet(name = "responsedemo")处错误由于一开始建文件的时候创建的是Servlet文件，代码自动补全括号内忘记修改
	问题解决方法：    修改代码    @WebServlet("/responsedemo")

异常二

创建人	李晓东
问题标题	手懒错误
问题分类	Web
附件	@WebServlet("/responsedemo")   public class responsedemo extends HttpServlet {       protected void doPost(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {           System.out.println("<---demo---> ");           request.setAttribute("msg","response");           response.sendRedirect("/responsedemo2");       }          protected void doGet(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {       }   }
问题答案	问题分析:       protected  void doGet(HttpServletRequest  request, HttpServletResponse response) throws ServletException, IOException {       }    处错误，由于代码自动补全的重写方法，里面的参数没有修改。
	问题解决方法：    修改代码    protected void doGet(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {    this.doPost(request,response);       }

异常三

创建人	李晓东
问题标题	格式问题
问题分类	Web
附件	@WebServlet("/responsedemo")   public class responsedemo extends HttpServlet {       protected void doPost(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {           System.out.println("<---demo---> ");           request.setAttribute("msg","response");           response.sendRedirect("/responsedemo2");       }          protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    this.doPost(request,response);       }   }          @WebServlet("/responsedemo2")   public class responsedemo2 extends HttpServlet {       protected void doPost(HttpServletRequest request, HttpServletResponse  response) throws ServletException, IOException {           System.out.println("demo2222222........");                    }          protected void doGet(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {           this.doPost(request,response);       }   }
问题答案	问题分析: responsedemo2控制台中未书写getAttribute();方法以及sout打印输出。所以未获取responsedemo中的setAttribute方法写下的数据。
	问题解决方法：在doPost方法中补写代码    添加代码Object msg  = request.getAttribute("msg");           System.out.println(msg);

异常四

创建人	李晓东
问题标题	格式问题
问题分类	Web
附件	@WebServlet("/responsedemo3")   public class responsedemo3 extends HttpServlet {       protected void doPost(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {           request.getRequestDispatcher("/responsedemo2").forward(request,response);       }          protected void doGet(HttpServletRequest req,  HttpServletResponse resp) throws ServletException,  IOException {           super.doGet(req, resp);       }   }
问题答案	问题分析: doGet方法是代码自动补全，有些需要修改的数据并未修改
	问题解决方法：修改代码   正确代码protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {     this.doPost(request,response); }

异常五

创建人	李晓东
问题标题	格式问题
问题分类	Web
附件	@WebServlet("/responsedemo4")   public class responsedemo4 extends HttpServlet {       protected void doPost(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {          response.setContentType("text/html,charset=utf-8");           //获取字符输出流           PrintWriter pw = response.getWriter();           //输出数据           pw.write("<h1>你好</h1> response");       }          protected void doGet(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {           this.doPost(request,response);       }   }
问题答案	问题分析:    response.setContentType("text/html,charset=utf-8");处格式错误
	问题解决方法：修改代码   正确代码   response.setContentType("text/html;charset=utf-8");

异常一

创建人	李晓东
问题标题	书写错误
问题分类	Web
附件	@WebServlet(name = "responsedemo")   public class responsedemo extends HttpServlet {       protected void doPost(HttpServletRequest request,  HttpServletResponse response) throws ServletException, IOException {           System.out.println("<---demo---> ");           request.setAttribute("msg","response");           response.sendRedirect("/responsedemo2");       }          protected void doGet(HttpServletRequest request,  HttpServletResponse response) throws ServletException, IOException {           this.doPost(request,response);       }   }
问题答案	问题分析:    @WebServlet(name = "responsedemo")处错误由于一开始建文件的时候创建的是Servlet文件，代码自动补全括号内忘记修改
	问题解决方法：    修改代码    @WebServlet("/responsedemo")

异常二

创建人	李晓东
问题标题	手懒错误
问题分类	Web
附件	@WebServlet("/responsedemo")   public class responsedemo extends HttpServlet {       protected void doPost(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {           System.out.println("<---demo---> ");           request.setAttribute("msg","response");           response.sendRedirect("/responsedemo2");       }          protected void doGet(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {       }   }
问题答案	问题分析:       protected  void doGet(HttpServletRequest  request, HttpServletResponse response) throws ServletException, IOException {       }    处错误，由于代码自动补全的重写方法，里面的参数没有修改。
	问题解决方法：    修改代码    protected void doGet(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {    this.doPost(request,response);       }

异常三

创建人	李晓东
问题标题	格式问题
问题分类	Web
附件	@WebServlet("/responsedemo")   public class responsedemo extends HttpServlet {       protected void doPost(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {           System.out.println("<---demo---> ");           request.setAttribute("msg","response");           response.sendRedirect("/responsedemo2");       }          protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    this.doPost(request,response);       }   }          @WebServlet("/responsedemo2")   public class responsedemo2 extends HttpServlet {       protected void doPost(HttpServletRequest request, HttpServletResponse  response) throws ServletException, IOException {           System.out.println("demo2222222........");                    }          protected void doGet(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {           this.doPost(request,response);       }   }
问题答案	问题分析: responsedemo2控制台中未书写getAttribute();方法以及sout打印输出。所以未获取responsedemo中的setAttribute方法写下的数据。
	问题解决方法：在doPost方法中补写代码    添加代码Object msg  = request.getAttribute("msg");           System.out.println(msg);

异常四

创建人	李晓东
问题标题	格式问题
问题分类	Web
附件	@WebServlet("/responsedemo3")   public class responsedemo3 extends HttpServlet {       protected void doPost(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {           request.getRequestDispatcher("/responsedemo2").forward(request,response);       }          protected void doGet(HttpServletRequest req,  HttpServletResponse resp) throws ServletException,  IOException {           super.doGet(req, resp);       }   }
问题答案	问题分析: doGet方法是代码自动补全，有些需要修改的数据并未修改
	问题解决方法：修改代码   正确代码protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {     this.doPost(request,response); }

异常五

创建人	李晓东
问题标题	格式问题
问题分类	Web
附件	@WebServlet("/responsedemo4")   public class responsedemo4 extends HttpServlet {       protected void doPost(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {          response.setContentType("text/html,charset=utf-8");           //获取字符输出流           PrintWriter pw = response.getWriter();           //输出数据           pw.write("<h1>你好</h1> response");       }          protected void doGet(HttpServletRequest request,  HttpServletResponse response) throws ServletException,  IOException {           this.doPost(request,response);       }   }
问题答案	问题分析:    response.setContentType("text/html,charset=utf-8");处格式错误
	问题解决方法：修改代码   正确代码   response.setContentType("text/html;charset=utf-8");