Java Servlet Robot 数据操作示例

是的，HttpServletRequest 的 getParameter 方法是 Java Servlet API 中的方法，用于从 HTTP 请求中获取参数的值。

@WebServlet({"/welcome"}) public class Robot extends HttpServlet { protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { String action = req.getParameter('action');

    if ('addRobot'.equals(action)) {
        
		RobotInfo robot =new RobotInfo();
        robot.setNAME(req.getParameter('robotname'));
        robot.setweight(req.getParameter('robotweight'));
        robot.setsize(req.getParameter('robotsize'));
        PreparedStatement pstmt = null ;   
        DBConnected dbc = null;
        String sql ='INSERT INTO `javawebdb`.`robot` (`ID`, `NAME`, `WEIGHT`, `SIZE`, `IMAGE`) VALUES (NULL,?,?,?,NULL)';
        try{   
            
            dbc = new DBConnected() ;   
            pstmt = dbc.getConnection().prepareStatement(sql) ; 
            pstmt.setString(1,robot.getNAME());
            pstmt.setString(2,robot.getweight());
            pstmt.setString(3,robot.getsize());
            
            int rs = pstmt.executeUpdate();
              
            pstmt.close() ;
            res.sendRedirect("./welcome.jsp");
        }catch (SQLException e){   
            System.out.println(e.getMessage());   
        }finally{   
            
            dbc.close() ;   
        }
    } else if ('deleteRobot'.equals(action)) {
    	 
    	RobotInfo robot =new RobotInfo();
        String ID =req.getParameter('robotID');
    	PreparedStatement pstmt = null ;   
        DBConnected dbc = null;
        String sql ='DELETE FROM Robot WHERE id = ?';

; try{

            dbc = new DBConnected() ;   
            pstmt = dbc.getConnection().prepareStatement(sql) ; 
            pstmt.setString(1,ID);
            
            int rs = pstmt.executeUpdate();
              
            pstmt.close() ; 
            res.sendRedirect("./welcome.jsp");
        }catch (SQLException e){   
            System.out.println(e.getMessage());   
        }finally{   
             
            dbc.close() ;   
        }
    } else if ('changeRobot'.equals(action)) {
    	RobotInfo robot =new RobotInfo();
    	String ID =req.getParameter('robotID1');
        robot.setNAME(req.getParameter('robotname1'));
        robot.setweight(req.getParameter('robotweight1'));
        robot.setsize(req.getParameter('robotsize1'));
        PreparedStatement pstmt = null ;   
        DBConnected dbc = null;
        String sql ='UPDATE Robot SET NAME = ?, WEIGHT = ?, SIZE=? WHERE id =?';

; try{

            dbc = new DBConnected() ;   
            pstmt = dbc.getConnection().prepareStatement(sql) ; 
            pstmt.setString(1,robot.getNAME());
            pstmt.setString(2,robot.getweight());
            pstmt.setString(3,robot.getsize());
            pstmt.setString(4, ID);
            
            int rs = pstmt.executeUpdate();
            pstmt.close() ; 
            res.sendRedirect("./welcome.jsp");
        }catch (SQLException e){   
            System.out.println(e.getMessage());   
        }finally{   
            
            dbc.close() ;
        
    }
     }
}

}这段代码中的增加操作中的HttpServletRequest的getParameter方法是java库中默认的方法吗