文章目录
JSP脚本
- JSP脚本用于在JSP页面内定义Java代码
- JSP脚本分类
1. <%...%>:内容会直接放到_jspService()方法之中
2. <%=...%>:内容会放到out.print()中，作为out.print()的参数
3. <%!...%>:内容会放到_jspService()方法之外，被类直接包含
举例<%=…%>
<%--
Created by IntelliJ IDEA.
User: guigui
Date: 2022/3/28
Time: 13:12
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>hello jsp</h1>
<%
System.out.println("hello JSP");
int i = 3;
%>
<%="hello"%>
<%=i%>
</body>
</html>
举例<%!..%>
成员变量，成员方法
<%--
Created by IntelliJ IDEA.
User: guigui
Date: 2022/3/28
Time: 13:12
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>hello jsp</h1>
<%!
void eat(){}
String name = "liuhongtao";
%>
</body>
</html>
JSP案例练习
具体效果
使用JSP脚本展示品牌数据
实现流程
我们使用list集合代替数据库内容
创建jsp_web项目
创建Brand.java实体类
com.taotao.pojo.Brand.java
package com.taotao.pojo;
/**
* create by 刘鸿涛
* 2022/3/28 16:19
*/
public class Brand {
private Integer id;
private String brand_name;
private String company_name;
private Integer ordered;
private String description;
private Integer status;
public Brand(){
}
public Brand(Integer id, String brand_name, String company_name, Integer ordered, String description, Integer status) {
this.id = id;
this.brand_name = brand_name;
this.company_name = company_name;
this.ordered = ordered;
this.description = description;
this.status = status;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getBrand_name() {
return brand_name;
}
public void setBrand_name(String brand_name) {
this.brand_name = brand_name;
}
public String getCompany_name() {
return company_name;
}
public void setCompany_name(String company_name) {
this.company_name = company_name;
}
public Integer getOrdered() {
return ordered;
}
public void setOrdered(Integer ordered) {
this.ordered = ordered;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Integer getStatus() {
return status;
}
public void setStatus(Integer status) {
this.status = status;
}
@Override
public String toString() {
return "Brand{" +
"id=" + id +
", brand_name='" + brand_name + '\'' +
", company_name='" + company_name + '\'' +
", ordered=" + ordered +
", description='" + description + '\'' +
", status=" + status +
'}';
}
}
JSP程序编写
<%@ page import="com.taotao.pojo.Brand" %>
<%@ page import="java.util.ArrayList" %><%--
Created by IntelliJ IDEA.
User: guigui
Date: 2022/3/28
Time: 16:29
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
@SuppressWarnings({"all"})
//模拟查询数据库
ArrayList<Brand> brands = new ArrayList<>();
brands.add(new Brand(1,"三只松鼠","三只松鼠",100,"三只松鼠，好吃不上火",1));
brands.add(new Brand(2,"优衣库","优衣库",200,"优衣库，服侍人生",2));
brands.add(new Brand(3,"小米","小米科技有限公司",1000,"为发烧而生",3));
%>
<html>
<head>
<meta charset="utf-8">
<title>Title</title>
</head>
<body>
<input type="button" value="新增"><br>
<hr>
<table border="1" cellspacing="0" width="800">
<tr>
<th>序号</th>
<th>品牌名称</th>
<th>企业名称</th>
<th>排序</th>
<th>品牌介绍</th>
<th>状态</th>
<th>操作</th>
</tr>
<%
for (int i = 0; i < brands.size(); i++) {
Brand brand = brands.get(i);
%>
<tr align="center">
<td>1</td>
<td>三只松鼠</td>
<td>三只松鼠</td>
<td>100</td>
<td>三只松鼠，好吃不上火</td>
<td>启用</td>
<td><a href="#">修改</a> <a href="#">删除</a></td>
</tr>
<%
}
%>
</table>
</body>
</html>
测试运行
更改for循环脚本
<%@ page import="com.taotao.pojo.Brand" %>
<%@ page import="java.util.ArrayList" %><%--
Created by IntelliJ IDEA.
User: guigui
Date: 2022/3/28
Time: 16:29
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
@SuppressWarnings({"all"})
//模拟查询数据库
ArrayList<Brand> brands = new ArrayList<>();
brands.add(new Brand(1,"三只松鼠","三只松鼠",100,"三只松鼠，好吃不上火",1));
brands.add(new Brand(2,"优衣库","优衣库",200,"优衣库，服侍人生",2));
brands.add(new Brand(3,"小米","小米科技有限公司",1000,"为发烧而生",3));
%>
<html>
<head>
<meta charset="utf-8">
<title>Title</title>
</head>
<body>
<input type="button" value="新增"><br>
<hr>
<table border="1" cellspacing="0" width="800">
<tr>
<th>序号</th>
<th>品牌名称</th>
<th>企业名称</th>
<th>排序</th>
<th>品牌介绍</th>
<th>状态</th>
<th>操作</th>
</tr>
<%
for (int i = 0; i < brands.size(); i++) {
Brand brand = brands.get(i);
%>
<tr align="center">
<td><%=brand.getId()%></td>
<td><%=brand.getBrand_name()%></td>
<td><%=brand.getCompany_name()%></td>
<td><%=brand.getOrdered()%></td>
<td><%=brand.getDescription()%></td>
<td><%=brand.getStatus()%></td>
<td><a href="#">修改</a> <a href="#">删除</a></td>
</tr>
<%
}
%>
</table>
</body>
</html>
测试运行2
做一个简单的逻辑判断
如果状态码为1 则显示启用，否则显示禁用
<%@ page import="com.taotao.pojo.Brand" %>
<%@ page import="java.util.ArrayList" %><%--
Created by IntelliJ IDEA.
User: guigui
Date: 2022/3/28
Time: 16:29
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
@SuppressWarnings({"all"})
//模拟查询数据库
ArrayList<Brand> brands = new ArrayList<>();
brands.add(new Brand(1,"三只松鼠","三只松鼠",100,"三只松鼠，好吃不上火",1));
brands.add(new Brand(2,"优衣库","优衣库",200,"优衣库，服侍人生",0));
brands.add(new Brand(3,"小米","小米科技有限公司",1000,"为发烧而生",1));
%>
<html>
<head>
<meta charset="utf-8">
<title>Title</title>
</head>
<body>
<input type="button" value="新增"><br>
<hr>
<table border="1" cellspacing="0" width="800">
<tr>
<th>序号</th>
<th>品牌名称</th>
<th>企业名称</th>
<th>排序</th>
<th>品牌介绍</th>
<th>状态</th>
<th>操作</th>
</tr>
<%
for (int i = 0; i < brands.size(); i++) {
Brand brand = brands.get(i);
%>
<tr align="center">
<td><%=brand.getId()%></td>
<td><%=brand.getBrand_name()%></td>
<td><%=brand.getCompany_name()%></td>
<td><%=brand.getOrdered()%></td>
<td><%=brand.getDescription()%></td>
<%
if(brand.getStatus() == 1){
%>
<td><%="启用"%></td>
//显示启用
<%
} else {
%>
<td><%="禁用"%></td>
<%
//显示禁用
}
%>
<td><a href="#">修改</a> <a href="#">删除</a></td>
</tr>
<%
}
%>
</table>
</body>
</html>
