Question

我正在尝试创建社交网站，并且面临接受和拒绝朋友请求的问题。这是我用来接受好友请求的代码：

<body>
<%!
    Connection conn;
    int user_id;
    int send_id;
    PreparedStatement pstmt;
%>
<%
    HttpSession session2 = request.getSession(false);
    user_id = (Integer)session2.getAttribute("id");
    send_id = Integer.parseInt(request.getParameter("snd_id"));
    try {
        Class.forName("com.mysql.jdbc.Driver");
    }
    catch(ClassNotFoundException e) {
        out.print(e);
    }

    try {
        conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/project","root","vishal");
        pstmt = conn.prepareStatement("create table if not exists Friends(requested int, accepted int)");
        pstmt.executeUpdate();
        pstmt = conn.prepareStatement("insert into Friends values(?,?)");
        pstmt.setInt(1,send_id);
        pstmt.setInt(2,user_id);
        pstmt.executeUpdate();
        pstmt = conn.prepareStatement("delete from PendingRequest where sender_id=? and receiver_id = ?");
        pstmt.setInt(1,send_id);
        pstmt.setInt(2,user_id);
        pstmt.executeUpdate();
    }

    catch(SQLException e) {
        out.print(e);
    }

    RequestDispatcher rd = request.getRequestDispatcher("/home.jsp");
    rd.include(request,response);
%>

现在代码将用户重定向到＆＃34; home.jsp＆＃34;页面，“朋友请求”列显示0个请求，但在数据库中有2到3个待处理请求。

有人可以解决这个问题吗？

以下是打印好友请求数量的代码：

<%
try
{
        conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/project","root","vishal");
        PreparedStatement pstmt = conn.prepareStatement("create table if not exists PendingRequest(sender_id int, receiver_id int)");
        pstmt.executeUpdate();
        PreparedStatement pstmt2 = conn.prepareStatement("select count(sender_id) from PendingRequest where receiver_id=?");
        pstmt2.setInt(1,user_id);
        ResultSet rst = pstmt2.executeQuery();
        if(rst.next())
            cnt=rst.getInt(1);
        pstmt = conn.prepareStatement("select sender_id from PendingRequest where receiver_id=?");
        pstmt.setInt(1,user_id);
        rst = pstmt.executeQuery();
        while(rst.next())
        {
            send[i] = rst.getInt(1);
            i++;
        }
    }
    catch(SQLException e)
    {
        out.print(e);
    }
%>
Friend Requests&nbsp;(<%=cnt%>)

Answer 1

我正在重定向到＆＃34; home.jsp＆＃34;重定向到网页＆＃34; home.jsp＆＃34;直接没有任何人登录。所以，我必须将登录ID和密码作为查询字符串传递，如下所示：

String lnk = "/home.jsp?login="+email+"&pass="+password;
pageContext.forward(lnk);

我已经将登录ID和密码检索为：

String email = (String)session2.getAttribute("email");
String password = (String)session2.getAttribute("password");

我已经放置在Sriplet内。

返回主页时，朋友请求显示0

1 个答案: