response.sendRedirect 在Servlet中跳转到一个网页,怎么实现?

[ijse]

我用
resp.sendRedirect("./helloworld/index.html");

没有办法实现,错误提示:
严重: Servlet.service() for servlet loginServlet threw exception
java.lang.IllegalStateException
at org.apache.catalina.connector.ResponseFacade.sendRedirect(ResponseFacade.java:435)
at loginServlet.doPost(loginServlet.java:37)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)

在网上查,可能是由于 我使用了response.getWriter();的原因...

我只想在一个Servlet类中打开另一个网页,怎么实现?谢谢!!

[ijse]

在线等啊...

[sangshusen_1988]

使用getWriter()之后好像不能再去跳转了

[Shen_JC]

把代码贴出来呢！

[ijse]

import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class loginServlet extends HttpServlet{

	private static final long serialVersionUID = 1L;

	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		
		req.setCharacterEncoding("utf-8");
		resp.setContentType("text/html;charset=utf-8");
		
		ConnSql conMyData = new ConnSql();
		String username = req.getParameter("UserName");
		String password = req.getParameter("PassWord");
		
		ResultSet rs = null;
		rs = conMyData.executeQuery("select * from users where dbusername='" + username +"'");
		
		resp.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY); 
		try
		{
			if(rs.next())//如果用户名存在
			{
				if(password.equals(rs.getString("dbpassword")))
				{
					resp.sendRedirect("loginSuccess.html");
					return;
				}else
				{
					resp.sendRedirect("javascript:alert('密码错误!!');");
					resp.sendRedirect("index.html");
					return;
				}
			}else
			{
				resp.sendRedirect("javascript:alert('用户名不存在!!');");
				resp.sendRedirect("index.html");
				return;
			}
		}catch(SQLException e)
		{
			e.printStackTrace();
		}finally
		{
			try
			{
				if(rs != null)
				{
					rs.close();
					rs = null;
				}
					conMyData.close();
				}catch(SQLException e)
				{
					e.printStackTrace();
				}
		}
		}
	}

[ijse]

哦...找到原因了.是这句有问题:
resp.sendRedirect("javascript:alert('用户名不存在!!');");

[ijse]

但是我想先弹出一个提示框,就是执行一段JAVASCRIPT代码,然后再转向,怎么实现?

[zl3450341]

[Quote=引用 6 楼 iijse 的回复:]
但是我想先弹出一个提示框,就是执行一段JAVASCRIPT代码,然后再转向,怎么实现?
[/Quote]

页面用js
点击提交Button按钮onclick 触发js

[sangshusen_1988]

再输出window.location.href=yoururl;

[ijse]

哦．．谢谢楼上．．