Question

我有一个jsp文件，我必须在其中显示带有日期和说明的注释由于特定日期可能有多个音符（如在调度程序中），因此一次显示多个音符。现在我希望用户可以通过复选框的帮助来修改数据库中的特定注释。现在，当笔记的值从数据库动态传递时，我如何设置复选框的值。

fetchcontent.java

public class CnmsDes extends HttpServlet{
    public void doPost.......{
        List list=new ArrayList();
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        System.out.println("Oracle Connect Example.");
        Connection conn = null;
        String url = "jdbc:oracle:thin:@localhost:1521:xe";
        String driver = "oracle.jdbc.driver.OracleDriver";
        String userName = "system"; 
        String password = "mint";
        Statement st;
        try {
            Class.forName(driver).newInstance();
            conn = DriverManager.getConnection(url,userName,password);
            System.out.println("Connected to the database");

            String  ndate  = request.getParameter("date");
            String  eid  = request.getParameter("empid");
            String strar[] = ndate.split("/");
            String cdate = strar[0]+"/" + strar[1]+"/"+ strar[2];
            if(eid==null||eid=="Enter Your Employee ID"){response.sendRedirect("viewnotes.jsp");}
            String query = "select * from CNMS_NOTES where emp_id='"+eid+"' and note_date='"+cdate+"'";

            Statement stmt=conn.createStatement();
            ResultSet rs=stmt.executeQuery(query);


            while(rs.next()){
                list.add(rs.getString("note_date"));
                list.add(rs.getString("title"));
                list.add(rs.getString("description"));

            }

        }
        catch(Exception e){out.print(e);}
        request.setAttribute("description",list);
        RequestDispatcher rd = request.getRequestDispatcher("/displaynotes.jsp");
        rd.forward(request, response);
    } 
}

和 displaynotes.jsp

<%@page language="java" import="java.util.*" %>
<html>
    <body background="images/bg1.jpg">     
        <form>
            <table class="t" border="1" width="650" align="center" >
                <tr>
                    <td width="10"><b></b></td>
                    <td width="100"><b>Date</b></td>
                    <td width="150"><b>Title</b></td>
                    <td width="100"><b>Description</b></td>            
                </tr>

                <%  
                    Iterator itr;
                    List data=(List)request.getAttribute("description");            
                    int k=data.size();
                    request.setAttribute("size",k);        
                    for(itr=data.iterator();itr.hasNext();) {
                %>

                <tr class="a">          
                    <td>
                        <input type="checkbox" name="cbdate" value="<%=request.getParameter("checkeddate") %>">
                    </td>
                    <td width="100">
                        <input type="text" name="checkeddate" value="<%=itr.next()%>" class="b">
                    </td>
                    <td width="150">
                        <input type="text" name="checkedtitle" value="<%=itr.next()%>" class="b">
                    </td>
                    <td width="200">
                        <textarea cols="39" rows="3"><%=itr.next()%></textarea>
                    </td>        
                </tr>
                <% } %>
            </table>
            <table border="1" align="center">
                <tr>
                    <td>
                        <input type="submit" value="MODIFY" onclick="this.form.action='expriment.jsp';">
                    </td>
                    <td>
                        <input type="submit" value="DELETE" onclick="this.form.action='abc.jsp';">
                    </td>
                </tr>
            </table>
        </form>
    </body>
</html>

Answer 1

我要做的是创建一个新的List数组，然后将当前列表对象添加到该数组中。

或者我真的可以继续创建一个名为Notes的新类文件，该文件将保存3个变量ndate，eid，cdate然后为它们制作getter / setter。然后我会在while（rs.next）循环中调用一个新的Notes类实例，使用我制作的setter方法设置每个值，然后将其添加到我制作的列表数组中。

public class Notes{

Date ndate;
String Title;
Date cdate;
int eid;

//create getter methods
//create setter methods
}

现在是CnmsDes类

public class CnmsDes extends HttpServlet{
    public void doPost.......{List list=new ArrayList();
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        System.out.println("Oracle Connect Example.");
        Connection conn = null;
        String url = "jdbc:oracle:thin:@localhost:1521:xe";
        String driver = "oracle.jdbc.driver.OracleDriver";
        String userName = "system"; 
        String password = "mint";
        Statement st;
        try {
            Class.forName(driver).newInstance();
            conn = DriverManager.getConnection(url,userName,password);
            System.out.println("Connected to the database");

            String  ndate  = request.getParameter("date");
            String  eid  = request.getParameter("empid");
            String strar[] = ndate.split("/");
            String cdate = strar[0]+"/" + strar[1]+"/"+ strar[2];
            if(eid==null||eid=="Enter Your Employee ID"){response.sendRedirect("viewnotes.jsp");}
            String query = "select * from CNMS_NOTES where emp_id='"+eid+"' and note_date='"+cdate+"'";

            Statement stmt=conn.createStatement();
            ResultSet rs=stmt.executeQuery(query);

            List<Notes> notesList = new ArrayList<Notes>();
            while(rs.next()){
                Notes myNotes = new Notes;
                myNotes.setNdate(rs.getDate("note_date"));
                myNotes.setTitle(rs.getString("title"));
                //you get the idea
                notesList.add(myNotes);
            }

        }
        catch(Exception e){out.print(e);}
        request.setAttribute("description",list);
        RequestDispatcher rd = request.getRequestDispatcher("/displaynotes.jsp");
        rd.forward(request, response);
    } 
}

如何在jsp中动态设置复选框的值（值来自数据库）

1 个答案: