1.<jsp:useBean>
Person.java
package zh.bean.demo;
public class Person {
private String name;
private int age;
public Person() {
}
public Person(String name, int age) {
this.name = name;
this.age = age;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setAge(int age) {
this.age = age;
}
public int getAge() {
return age;
}
@Override
public String toString() {
return "Person [name=" + name + ", age=" + age + "]";
}
}
访问路径：http://localhost:8080/Javaweb01/jsp/useBean.jsp
2.<jsp:setProperty>
（1）方式一
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="zh.bean.demo.Person"%>
<!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>Insert title here</title>
</head>
<body>
<jsp:useBean id="person" class="zh.bean.demo.Person" scope="page"></jsp:useBean>
<!-- 访问路径中参数名为name的值才会赋值给person对象
例如：http://localhost:8080/Javaweb01/jsp/setProperty.jsp?name=zh-->
<jsp:setProperty name="person" property="name"/>
<%
person = (Person)pageContext.getAttribute("person");
out.print(person);
%>
</body>
</html>
访问路径：http://localhost:8080/Javaweb01/jsp/setProperty.jsp?name=zh
访问路径为：http://localhost:8080/Javaweb01/jsp/setProperty.jsp?name=zh&age=19，也只有参数名为name的值才会赋值给person对象。
（2）方式二
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="zh.bean.demo.Person"%>
<!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>Insert title here</title>
</head>
<body>
<jsp:useBean id="person" class="zh.bean.demo.Person" scope="page"></jsp:useBean>
<!--访问路径中与person对象属性同名的参数值才会赋值给person对象 -->
<jsp:setProperty name="person" property="*"/>
<%
person = (Person)pageContext.getAttribute("person");
out.print(person);
%>
</body>
</html>
访问路径：http://localhost:8080/Javaweb01/jsp/setProperty.jsp?name=zh&age=19
访问路径：http://localhost:8080/Javaweb01/jsp/setProperty.jsp?name=zh&age=19&sex=man
（3）方式三
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="zh.bean.demo.Person"%>
<!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>Insert title here</title>
</head>
<body>
<jsp:useBean id="person" class="zh.bean.demo.Person" scope="page"></jsp:useBean>
<!--将访问路径中指定的参数值赋给person对象 -->
<jsp:setProperty name="person" property="name" param="username"/>
<%
person = (Person)pageContext.getAttribute("person");
out.print(person);
%>
</body>
</html>
访问路径：http://localhost:8080/Javaweb01/jsp/setProperty.jsp?username=hao&name=huan。由于指定参数的原因，即使访问路径中存在name参数，也不把它赋给person的name属性，而是把username值赋给person的name属性。
（4）方式四
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="zh.bean.demo.Person"%>
<!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>Insert title here</title>
</head>
<body>
<jsp:useBean id="person" class="zh.bean.demo.Person" scope="page"></jsp:useBean>
<!--使用value的值给person对象的属性赋值，此时忽略访问路径中的所有参数 -->
<jsp:setProperty name="person" property="name" value="xxdty"/>
<%
person = (Person)pageContext.getAttribute("person");
out.print(person);
%>
</body>
</html>
访问路径：http://localhost:8080/Javaweb01/jsp/setProperty.jsp?name=zh&name=22。
3.<jsp:getProperty>
User.java
package zh.bean.demo;
public class User {
private String name;
private String gender;
private String education;
private String email;
public User() {
}
public User(String name, String gender, String education, String email) {
super();
this.name = name;
this.gender = gender;
this.education = education;
this.email = email;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getEducation() {
return education;
}
public void setEducation(String education) {
this.education = education;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "User [name=" + name + ", gender=" + gender + ", education="
+ education + ", email=" + email + "]";
}
}
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>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/jsp/user.jsp" method="post">
姓名：<input type="text" name="name"></br>
性别：<input type="radio" name="gender" value="man" checked="checked">男
<input type="radio" name="gender" value="woman">女</br>
学历：<select name="education">
<option value="select">-请选择-</option>
<option value="high_school">高中</option>
<option value="Undergraduate">大学本科</option>
<option value="master">硕士</option>
</select></br>
<!-- 【注意】：表单里的mail和User类的属性email不同 -->
邮箱：<input type="text" name="mail"></br>
<input type="submit" value="提交">
</form>
</body>
</html>
<%@ 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>Insert title here</title>
</head>
<body>
<!-- 创建user -->
<jsp:useBean id="user" class="zh.bean.demo.User" scope="page"></jsp:useBean>
<!-- 属性赋值 -->
<jsp:setProperty property="*" name="user"/><!-- 与属性名同名的参数自动赋值给相应的属性 -->
<jsp:setProperty property="email" param="mail" name="user"/><!-- 使用param为email属性赋值 -->
<!-- 输出属性值 -->
姓名：<jsp:getProperty property="name" name="user"/></br>
性别：<jsp:getProperty property="gender" name="user"/></br>
学历：<jsp:getProperty property="education" name="user"/></br>
邮箱：<jsp:getProperty property="email" name="user"/>
</body>
</html>
访问路径：http://localhost:8080/Javaweb01/jsp/login.jsp
user.jsp显示结果：
