的request.getParameter（）返回的Java Servlet NULL从另一个servlet

Question

我做了两个servlet Authenticate.java和Accept.java

这里的Authenticate.java

 PreparedStatement stmt = null; 
     PrintWriter out=response.getWriter(); 

     response.setContentType("text/html"); 
     response.setCharacterEncoding("UTF-8"); 
     try{ 
      int cnt=0; 
      Class.forName("com.ibm.db2.jcc.DB2Driver"); 
      Connection con= DriverManager.getConnection("jdbc:db2://localhost:50000/SSMS", "kiit", "kiit"); 
      con.setAutoCommit(false); 
      String s=request.getParameter("userName"); 
      if(s==null){ 
       out.println("You Are Not Authorized"); 
       return; 
      } 
      stmt=con.prepareStatement("SELECT COMP_ID,NAME,CONTACT FROM COMPANYREG"); 

      ResultSet rs=stmt.executeQuery(); 
      while(rs.next()){ 
       cnt++; 
       out.println("<form action='Accept' method='post'> <input type='text' size='20' id='cmpid' value='"+rs.getString(1)+"'><br> Name :"+rs.getString(2)+"<br>Contact: "+rs.getString(3)+"<br><input type='submit' class='confirm' id='"+cnt+"' value='Approve'><br></form>"); 
      } 

的的doGet函数调用它和下面有Accept.java

   String user=request.getParameter("cmpid"); 

     PrintWriter out=response.getWriter(); 
     response.setContentType("text/html"); 
     response.setCharacterEncoding("UTF-8"); 
     out.println("user = "+user); 
     try{ 
      String cid = null,pss = null,nam = null,add = null,sec = null,cnt = null,ema = null; 
      Class.forName("com.ibm.db2.jcc.DB2Driver"); 
      Connection con= DriverManager.getConnection("jdbc:db2://localhost:50000/SSMS", "kiit", "kiit"); 

      stmt=con.prepareStatement("SELECT * FROM COMPANYREG WHERE COMP_ID = '"+user+"'"); 
      ResultSet rs=stmt.executeQuery(); 
      out.println("query1"); 
      while(rs.next()){ 
       out.println("query2"); 
       cid = rs.getString(1); 
       pss=rs.getString(2); 
       nam=rs.getString(3); 
       add=rs.getString(4); 
       sec=rs.getString(5); 
       cnt=rs.getString(6); 
       ema=rs.getString(7); 

      } 
      out.println("query3"); 
      stmt=con.prepareStatement("INSERT INTO COMPANY VALUES ('"+cid+"','"+pss+"','"+nam+"','"+add+"','"+sec+"',"+cnt+",'"+ema+"')"); 

      int numRowsChanged= stmt.executeUpdate(); 
      if(numRowsChanged==0) out.println("Some Error Encountered Please Re-enter Information values Correctly"); 
      else out.println("You Were Registered Successfully.You will be allowed to login once your details are verified. Thank You"); 

在Accept.java类时我指的是变量 “cmpid” 使用的request.getParameter（ “cmpid”）;

它返回null ......有人可以告诉我究竟是什么问题？

Answer 1

out.println("<form action='Accept' method='post'> <input type='text' size='20' id='cmpid' value='"+rs.getString(1)+"'><br> Name :"+rs.getString(2)+"<br>Contact: "+rs.getString(3)+"<br><input type='submit' class='confirm' id='"+cnt+"' value='Approve'><br></form>"); 

在形式添加name属性为 “名称= cmpid”