Android简单的web提交表单登录

1、创建Web项目:

public class LoginServlet extends HttpServlet {
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		String username = req.getParameter("username");
		String password = req.getParameter("password");
		System.out.println("username:" + username + "\t" + "password:" + password);

		resp.setContentType("text/html");
		resp.setCharacterEncoding("utf-8");
		PrintWriter out = resp.getWriter();

		String msg = null;
		if (username.trim().equals("") || username.trim().length() == 0) {
			msg = "用户名不能为空!";
		} else if (password.trim().equals("") || password.trim().length() == 0) {
			msg = "密码不能为空!";
		} else if (username.trim().equals("admin") && password.trim().equals("123")) {
			msg = "登陆成功!";
		} else {
			msg = "用户名或密码错误!";
		}
		System.out.println(msg);
		out.print(msg);
		out.flush();
		out.close();

	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doGet(req, resp);
	}
}
public class LoginServlet exten