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Question

用标签怎么不能显示数据？？还有如何对其单一数据进行删除修改 
数据层： 
package datajava; 
import java.sql.*; 
import java.util.*; 
public class xians { 
    private Connection conn; 
    private PreparedStatement psmt; 
    private ResultSet rs; 
    private ArrayList arry; 
    public ArrayList xiashconn(){ 
        conn=new database().dataconn(); 
        try { 
            psmt = conn.prepareStatement("select * from userinfo"); 
            rs=psmt.executeQuery(); 
            while(rs.next()) 
            { 
                userbane ub=new userbane(); 
                ub.setUserid(rs.getString(1)); 
                ub.setUsername(rs.getString(2)); 
                ub.setUsersex(rs.getString(3)); 
                ub.setUserpassword(rs.getString(4)); 
                arry.add(ub); 
            } 
        } catch (SQLException ex) { 
        }finally 
        { 
            if(conn!=null) 
              try { 
                  conn.close(); 
              } catch (SQLException ex1) { 
              }         } 
        return arry; 
    } 
} 
实体类： 
package datajava; 
public class userbane { 
    private String userid; 
    private String username; 
    private String usersex; 
    private String userpassword; 
    public String getUserid() { 
        return userid; 
    }     public String getUsername() { 
        return username; 
    }     public String getUsersex() { 
        return usersex; 
    }     public String getUserpassword() { 
        return userpassword; 
    }     public void setUserid(String userid) { 
        this.userid = userid; 
    }     public void setUsername(String username) { 
        this.username = username; 
    }     public void setUsersex(String usersex) { 
        this.usersex = usersex; 
    }     public void setUserpassword(String userpassword) { 
        this.userpassword = userpassword; 
    } 
} 模型层： 
<table border="2"> 
  <tr> 
    <td>姓名 </td> 
    <td>性别 </td> 
    <td>ID </td> 
    <td>密码 </td> 
    <td>修改 </td> 
    <td>删除 </td> 
  </tr> 
    <c:forEach var="i" items="responseScope.arry"> 
    <tr> 
      <td> 
        <c:out value="${i.userid}"/> 
      </td> 
<td> 
        <c:out value="${i.usersex}"/> 
      </td> <td> 
        <c:out value="${i.username}"/> 
      </td> <td> 
        <c:out value="${i.userpassword}"/> 
      </td>       <td>修改 </td> 
      <td>删除 </td> 
    </tr> 
  </c:forEach> 
控制层： 
datajava.userbane ub = new datajava.userbane();         ArrayList arry = new datajava.xians().xiashconn(); 
                              if (arry == null) { 
                    response.sendRedirect("shibai.jsp"); 
                } else { 
                    request.setAttribute("arry",arry); 
                    request.getRequestDispatcher("/xianshi.jsp").forward( 
                            request, 
                            response); 
                                  }             } else { 
                response.sendRedirect("shibai.jsp"); 
            }        

Answer 1

<c:forEach var="i" items="responseScope.arry"> 
->
<c:forEach var="i" items="${responseScope.arry}"> 试一试