struts 简单前台用户名校验
一个jsp
<?xml version="1.0" encoding="GB18030" ?>
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<%
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=GB18030" />
<base href="<%=basePath %>"/>
<title>Insert title here</title>
</head>
<body>
使用addFieldError方法和s:fieldError标签简单处理数据校验
<a href="user/user!add?name=a" >添加用户</a>
</body>
</html>
Action
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport {
private String name;
public String add() {
if(name == null || !name.equals("admin")) {
this.addFieldError("name", "name is error");
this.addFieldError("name", "name is too long");
return ERROR;
}
return SUCCESS;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
跳到另一个jsp
<?xml version="1.0" encoding="GB18030" ?>
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<%@taglib uri="/struts-tags" prefix="s" %>
<!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=GB18030" />
<title>Insert title here</title>
</head>
<body>
User Add Error!
<s:fielderror fieldName="name" theme="simple"/><%-- struts的固定样式simple显示Action往fielderror中添加的错误信息 --%>
<br />
<s:property value="errors.name[0]"/>><%-- 取错误信息值栈是一个Map，键errors对应的value是一个Map，键name对应的value是一个数组或者集合，所以上面的Action中可以往name中添加多条信息 --%>
<s:debug></s:debug><%-- 该标签调试用，加上后在页面中可以看值栈中的内容， --%>
</body>
</html>
