关于注册/登录网页的总结

关于注册/登录网页连接到数据库:
注册:

 String id = request.getParameter("id");
	String member = request.getParameter("member");
	String pass = request.getParameter("pass");
	String name = request.getParameter("name");
	try {
        //1，加载驱动
        Class.forName("com.mysql.jdbc.Driver");
        //2，建立连接
        java.sql.Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/sht", "root", "root");
        //3，创建sql传送对象
        Statement stmt = conn.createStatement();       
        //4，将sql语句通过sql传送对象传送到数据库并执行，返还结果集
		String sql = "insert into member value('"+id+"','"+member+"','"+pass+"','"+name+"')";
        stmt.executeUpdate(sql); 
        stmt.close();
        conn.close();

跳转代码:

response.sendRedirect("login.html");//跳转到login.html

登录:

<form id="form1" name="form1" method="post" action="dologin.jsp">//表单登录提交之后跳转到dologin.jsp

显示列表sql:

try{
  Class.forName("com.mysql.jdbc.Driver");
  java.sql.Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/sht","root","root");
  Statement stmt = conn.createStatement();
  String sql = "select * from member";  
  ResultSet rs = stmt.executeQuery(sql);	  
  while(rs.next()){

跳转到修改页面并且把所要修改行的“id”传过去:

<a href="update.jsp?id=<%=rs.getString(1)%>">修改</a>

其中id=<%=rs.getString(1)%>为传ID

try {
        //1，加载驱动
        Class.forName("com.mysql.jdbc.Driver");
        //2，建立连接
        java.sql.Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/sht", "root", "root");
        //3，创建sql传送对象
        Statement stmt = conn.createStatement();       
        //4，将sql语句通过sql传送对象传送到数据库并执行，返还结果集
		String sql = "update member set member ='"+member+"',pass='"+pass+"',name='"+name+"' where id='"+id+"'";//更新数据
        stmt.executeUpdate(sql); 
        stmt.close();
        conn.close();
	 } catch (Exception e) {
        System.out.println(e);
    }
	 response.sendRedirect("dolist.jsp");

跳转到删除页面并且把所要删除行的“id”传过去:

<a href="delete.jsp?id=<%=rs.getString(1)%>">

try {
        //1，加载驱动
        Class.forName("com.mysql.jdbc.Driver");
        //2，建立连接
        java.sql.Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/sht", "root", "root");
        //3，创建sql传送对象
        Statement stmt = conn.createStatement();       
        //4，将sql语句通过sql传送对象传送到数据库并执行，返还结果集
		String sql = "delete  from member  where id='"+id1+"'";//删除数据delete  from member  
        stmt.executeUpdate(sql); 
        stmt.close();
        conn.close();
	 } catch (Exception e) {
        System.out.println(e);
    }
	 response.sendRedirect("dolist.jsp");