Controller的寫法：
@Controller
@RequestMapping("/auth")
public class LoginLogoutController {
private static final Logger logger = LoggerFactory.getLogger(LoginLogoutController.class);
@RequestMapping(value = "/login", method = RequestMethod.GET)
public ModelAndView getLoginPage(@RequestParam(value = "error", required = false) boolean error) {
logger.debug("Received request to show login page");
String errorValue = null;
if (error == true) {
errorValue = "You have entered an invalid username or password!";
} else {
errorValue = "";
}
Map<String, String> model = new HashMap<String, String>();
model.put("error", errorValue);
ModelAndView mav = new ModelAndView("loginpage", model);
return mav;
}
---------------
JSp頁面擷取ModelAndView傳遞的值
<%@ page isELIgnored="false"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Login</title>
</head>
<body>
<h1>Login</h1>
<div id="login-error" style="color: #F00"><%=request.getAttribute("error")%></div>
<div id="login-error" style="color: #F00">${requestScope.error}</div>
<form action="../j_spring_security_check" method="post">
<p>
<label>Username</label>
<input id="j_username" name="j_username" type="text" />
</p>
<p>
<label>Password</label>
<input id="j_password" name="j_password" type="password" />
</p>
<input type="submit" value="Login" />
</form>
</body>
</html>
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