struts2：extends ActionSupport
@Override
public String execute() throws Exception {
User user = userService.getUser(loginName);
if (user==null) {
addFieldError("loginName",getText("invalid.loginname")); 用户名错误
return INPUT;
}
else if (!user.getPassword().equals(password)) {
addFieldError("password", getText("invalid.password")); 密码错误
return INPUT;
}
else {
sessionMap.put("user",user);
return SUCCESS;
}
SpringMVC:啥都没继承
把对象写在方法的参数列表中，spring会自动创建这个对象
//建议不用实体类接受请求，建议单独定义一个表单类
@RequestMapping(value="login",method=RequestMethod.POST)
public String doLogin2(
@ModelAttribute("form")LoginForm loginForm,//这样转发回表单页面的时候会自动回填数据
BindingResult result
){
if(!loginForm.getLoginName().equals("admin")){
result.rejectValue("loginName","form", "用户名输入错误"); //reject是驳回的意思
}else if (!loginForm.getPassword().equals("123456")) {
result.rejectValue("password","form", "密码输入错误");
}
//如果添加了错误信息，则转发回登陆表单页面
if(result.hasErrors()){
return "login";
} System.out.println("登录名："+loginForm.getLoginName());
System.out.println("密码："+loginForm.getPassword());
return "hello";
}
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>SpringMVC</title>
<link href="style/style.css" rel="stylesheet" type="text/css"/> </head>
<body>
<!-- 对象要和表单绑定，把对象传递过来 -->
<form:form action="" method="post" commandName="form">
<tr>
<td>登录名：</td>
<td>
<form:input path="loginName" />
</td>
</tr>
<tr>
<td></td>
<td>
<form:errors path="loginName"/>
</td>
</tr>
<tr>
<td>密码：</td>
<td>
<form:password path="password" />
</td>
</tr>
<tr>
<td></td>
<td>
<form:errors path="password"/>
</td>
</tr>
<tr>
<td></td>
<td>
<input type="submit" value="登陆"/>
</td>
</tr> </form:form>
</body>
</html>