你好 我这个jsp页面下alert弹窗无效，请问是什么原因呢。。
<body><%request.setCharacterEncoding("UTF-8");StringuserName=request.getParameter("us...
<body>
<%
request.setCharacterEncoding("UTF-8");
String userName = request.getParameter("username");
String userPassword = request.getParameter("password");
if((userName!=null)&&(userName!="")&&(userPassword!=null)&&(userPassword!=""))
{
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/lrm?useUnicode=true&characterEncoding=utf-8","miao","123");
String sql = "SELECT password FROM users WHERE username='" + userName + "'";
Statement stat = conn.createStatement();
ResultSet rs = stat.executeQuery(sql);
boolean flag=true;
while(rs.next()){
flag=false;
String password = rs.getString("password");
if(password.equals(userPassword))
{
String name = new String(userName);
session.setAttribute("name",name);
Integer count = (Integer)application.getAttribute("count");
ArrayList names = new ArrayList();
names.add(name);
application.setAttribute("names",names);
if(count==null){
count = new Integer(0);
}
count++;
application.setAttribute("count",count);
response.sendRedirect("main.jsp");
}
else
{
%>
<script language="javascript">alert("用户名或者密码输错啦~");</script>
<%
response.sendRedirect("index.jsp");
}
}
if(flag)
{
%>
<script language="javascript">alert("用户名或者密码输错啦~");</script>
<%
response.sendRedirect("index.jsp");
}
stat.close();
conn.close();
}
%>
</body> 展开
<%
request.setCharacterEncoding("UTF-8");
String userName = request.getParameter("username");
String userPassword = request.getParameter("password");
if((userName!=null)&&(userName!="")&&(userPassword!=null)&&(userPassword!=""))
{
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/lrm?useUnicode=true&characterEncoding=utf-8","miao","123");
String sql = "SELECT password FROM users WHERE username='" + userName + "'";
Statement stat = conn.createStatement();
ResultSet rs = stat.executeQuery(sql);
boolean flag=true;
while(rs.next()){
flag=false;
String password = rs.getString("password");
if(password.equals(userPassword))
{
String name = new String(userName);
session.setAttribute("name",name);
Integer count = (Integer)application.getAttribute("count");
ArrayList names = new ArrayList();
names.add(name);
application.setAttribute("names",names);
if(count==null){
count = new Integer(0);
}
count++;
application.setAttribute("count",count);
response.sendRedirect("main.jsp");
}
else
{
%>
<script language="javascript">alert("用户名或者密码输错啦~");</script>
<%
response.sendRedirect("index.jsp");
}
}
if(flag)
{
%>
<script language="javascript">alert("用户名或者密码输错啦~");</script>
<%
response.sendRedirect("index.jsp");
}
stat.close();
conn.close();
}
%>
</body> 展开
1个回答
展开全部
不是无效，是没来得及生效，就被重定向走了
改成：
<script language="javascript">alert("用户名或者密码输错啦~");location.href='index.jsp'</script>//让js处理alert和重定向
//response.sendRedirect("index.jsp");//不用服务器重定向
改成：
<script language="javascript">alert("用户名或者密码输错啦~");location.href='index.jsp'</script>//让js处理alert和重定向
//response.sendRedirect("index.jsp");//不用服务器重定向
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