JSP 标签
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2022-06-08 23:24:20
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index.jsp
<%@ 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>JSP常用标签</title>
</head>
<body>
<%-- jsp:include与pageContext.include()效果一样 动态包含，把执行结果聚合包含--%>
<jsp:include page="/login.jsp"></jsp:include>
<%-- jsp:forward 跳转页面 --%>
<%--
<jsp:forward page="/Servlet">
<jsp:param name="username" value="xxxx"></jsp:param>
</jsp:forward>
--%>
<%--jsp:userbean 实例化并获取JavaBean(实体类)对象，如果已经实例化就不再实例化，而是直接获取已经实例化的JavaBean对象 --%>
<jsp:useBean id="user1" class="cn.et.User" scope="session">
<%-- useBean标签体只在useBean标签实例化JavaBean时执行 --%>
Session会话中创建一个User对象
</jsp:useBean>
<%--
http://localhost:8080/JSP3/index.jsp?username=lu&userage=20
jsp:setProperty 支持8种基本数据类型的自动转换
--%>
<jsp:setProperty name="user1" property="name" value="ul"/>
<jsp:setProperty name="user1" property="age" value="02"/>
<%-- <jsp:setProperty name="user1" property="birthday" value="<%=new Date()%>"/> --%>
<%=user1%>
<br/>
<jsp:useBean id="user2" class="cn.et.User" scope="page">
<%-- useBean标签体只在useBean标签实例化JavaBean时执行 --%>
每访问一次，创建一个User对象
</jsp:useBean>
<%--http://localhost:8080/JSP3/index.jsp?username=lu&userage=20--%>
<%--<jsp:setProperty name="user2" property="name" param="*"/>--%>
<jsp:setProperty name="user2" property="name" param="username"/>
<jsp:setProperty name="user2" property="age" param="userage"/>
<%=user2%>
<%--
<%user2.getName()>
<jsp:getProperty name="user2" property="name"/>
<jsp:getProperty name="user2" property="age"/>
<%user2.getAge()>
--%>
</body>
</html>login.jsp
<%@ 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>表单</title>
<script type="text/javascript">
/*用户名验证*/
function check_name() {
var nameNode = document.getElementsByName("user")[0];
var name = nameNode.value;
var spanNode = document.getElementById("userNameSpan");
if(name.length > 6){
spanNode.innerHTML = "用户名不能超过6个字".fontcolor("red");
return false;
}
if(name.length == 0) {
spanNode.innerHTML = "用户名不能为空".fontcolor("red");
return false;
}
spanNode.innerHTML="";
return true;
}
/*密码验证*/
function check_password() {
var nameNode = document.getElementsByName("password")[0];
var name = nameNode.value;
var spanNode = document.getElementById("userPassSpan");
if(name.length > 16){
spanNode.innerHTML = "密码不能超过16个字".fontcolor("red");
return false;
}
if(name.length == 0) {
spanNode.innerHTML = "密码不能为空".fontcolor("red");
return false;
}
spanNode.innerHTML="";
return true;
}
function submitForm() {
return check_name()&&check_password();
}
</script>
</head>
<body>
<form align="center" action="#" method="get" onsubmit="return submitForm()">
<h1>登 入</h1>
用 户<input type="text" name="user" onblur="check_name()" placeholder="请输入账号"/><br>
<span id="userNameSpan"></span><br/>
密 码<input type="password" name="password" onblur="check_password()" placeholder="请输入密码"/><br>
<span id="userPassSpan"></span><br/>
<input type="submit" value="提交" />
<input type="reset" value="重置"/><br/>
<a href="register.html">我要注册</a>
</form>
</body>
</html>package cn.et;
public class User {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
User other = (User) obj;
if (age != other.age)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}
@Override
public String toString() {
return "User [name=" + name + ", age=" + age + "]";
}
}