【Java】【EL表达式】快速入门
2017-04-09 本文已影响27人
JerichoPH
- index.jsp
<%@ page import="com.demo.entity.User" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>JDemo</title>
</head>
<body>
<h1>JDemo</h1>
<%
User user = new User();
user.setName("张三");
user.setAge("23");
request.setAttribute("user", user);
request.getRequestDispatcher("/2.jsp").forward(request, response);
%>
</body>
</html>
- 2.jsp
<%@ page import="com.demo.entity.User" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
User user = (User) request.getAttribute("user");
out.print(user.getName());
out.print(user.getAge());
%>
<%--EL属性导航，这种方式可以不用暴力反射也可以直接获取private字段值--%>
${user["name"]}
${user["age"]}
</body>
</html>
- User
package com.demo.entity;
public class User {
private String name;
private String age;
@Override
public String toString() {
return "User{" +
"name='" + name + '\'' +
", age='" + age + '\'' +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
User user = (User) o;
if (name != null ? !name.equals(user.name) : user.name != null) return false;
return age != null ? age.equals(user.age) : user.age == null;
}
@Override
public int hashCode() {
int result = name != null ? name.hashCode() : 0;
result = 31 * result + (age != null ? age.hashCode() : 0);
return result;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}
- IndexServlet.java
package com.demo;
import java.io.IOException;
import java.io.PrintWriter;
public class IndexServlet extends javax.servlet.http.HttpServlet {
protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
this.doPost(request, response);
}
protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=utf-8");
PrintWriter out = response.getWriter();
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
}
