Java web：修改Tomcat服务器端口号的方法，jsp，集合，表格，拼接，循环【诗书画唱】
自己总结的个人的理解和技巧：
jsp就是用<% %>等在jsp文件中可以同时写Java和HTML等的代码，<% %>里面的可以都为Java部分等，而外面的可以为HTML部分的。只要是自己认为应该为Java部分的代码等都用<% %>括起来。有时要把Java中换行的语句等，转换成HTML中的<br/>等，HTML和Java等的代码混合起来等。——诗书画唱
//下面是JSP常用的方法：
//方法1：拼接html代码（个人理解：用了<%= %>，
// <% %>和HTML等的）
//方法2：混搭（个人理解：
//用<% %>和HTML等的）
下面是常见的防乱码等的JSP代码模板（一般来说把默认生成的jsp模板等中的字符集设置为UTF-8也可能会不容易出现乱码等）：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<h1>诗书画唱</h1>
<%
String[] name = { "百度", "京东", "B站" };
String[] hrefName = { "http://www.baidu.com", "http://www.jd.com",
for (int i = 0; i < name.length; i++) {
String html = "<a href='" + hrefName[i] + "'>" + name[i]
+ "</a>";
%>
<%=html%>
<%
}
%>
</body>
</html>
下面是建jsp代码必要的（至于怎么建可以看我发的教程视频或专栏等）：
1、在jsp页面显示一个九九乘法表。
<%@ page language="java" contentType=
"text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
for(int j=1;j<=9;j++) {
for(int i=1;i<=j;i++){
%>
<%=j%>*<%=i%>=<%=i*j%>;
<%
}
%>
<br/>
<%
}
%>
</body>
</html>
2、创建一个商品类，包含名称，价格和类型三个属性，通过两种循环方式拼接table在页面显示所有商品的信息。
插入单条的表格：
package com.SSHC;
public class Product {
private String name;
private Double price;
private String type;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
}
<%@page import="com.SSHC.Product"%>
<%@page import="java.util.ArrayList"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html;
charset=UTF-8" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"
+request.getServerName()+":"+request.getServerPort()
+path+"/";
List<Product> list = new ArrayList<Product>();
Product p= new Product();
p.setName("诗书画唱CD");
p.setPrice(6.66);
p.setType("CD");
list.add(p);
%>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content=
"keyword1,keyword2,keyword3">
<meta http-equiv="description"
content="This is my page">
</head>
<body>
<table border="1">
<tr>
<th>商品名称</th>
<th>商品价格</th>
<th>商品类型</th>
</tr>
<%
for(int i = 0;i < list.size();i ++) {
//取出list中的每样商品：
Product pro = list.get(i);
%>
<tr>
<td><%=pro.getName() %></td>
<td><%="￥" + pro.getPrice() %></td>
<td><%=pro.getType() %></td>
</tr>
<%
}
%>
</table>
</body>
</html>
第一种插入多条的循环方式：
<%@page import="com.SSHC.Product"%>
<%@page import="java.util.ArrayList"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html;
charset=UTF-8" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"
+request.getServerName()+":"+request.getServerPort()
+path+"/";
List<Product> list = new ArrayList<Product>();
String []arrName={"诗书画唱CD1","诗书画唱CD2","诗书画唱CD3"};
Double []arrPrice={6.66,6.66,6.66};
String []arrType={"CD1","CD2","CD3"};
for(int i=0;i<arrName.length;i++){
Product p= new Product();
p.setName(arrName[i]);
p.setPrice(arrPrice[i]);
p.setType(arrType[i]);
list.add(p);
}
%>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content=
"keyword1,keyword2,keyword3">
<meta http-equiv="description"
content="This is my page">
</head>
<body>
<table border="1">
<tr>
<th>商品名称</th>
<th>商品价格</th>
<th>商品类型</th>
</tr>
<%
for(int i = 0;i < list.size();i ++) {
//取出list中的每样商品：
Product pro = list.get(i);
%>
<tr>
<td><%=pro.getName() %></td>
<td><%="￥" + pro.getPrice() %></td>
<td><%=pro.getType() %></td>
</tr>
<%
}
%>
</table>
</body>
</html>
第二种插入多条的循环方式：
<%@page import="com.SSHC.Product"%>
<%@page import="java.util.ArrayList"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html;
charset=UTF-8" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"
+request.getServerName()+":"+request.getServerPort()
+path+"/";
List<Product> list = new ArrayList<Product>();
for(int i=0;i<10;i++){
Product p= new Product();
p.setName("诗书画唱CD1"+i);
p.setPrice(6.66+i);
p.setType("CD"+i);
list.add(p);
}
%>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content=
"keyword1,keyword2,keyword3">
<meta http-equiv="description"
content="This is my page">
</head>
<body>
<table border="1">
<tr>
<th>商品名称</th>
<th>商品价格</th>
<th>商品类型</th>
</tr>
<%
for(int i = 0;i < list.size();i ++) {
//取出list中的每样商品：
Product pro = list.get(i);
%>
<tr>
<td><%=pro.getName() %></td>
<td><%="￥" + pro.getPrice() %></td>
<td><%=pro.getType() %></td>
</tr>
<%
}
%>
</table>
</body>
</html>
3、创建一个Person类，包含姓名、性别和生日属性，用两个循环拼接table在页面显示所有人的信息。
package com.SSHC;
public class Person {
private String name;
private String sex;
private String brithday;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getBrithday() {
return brithday;
}
public void setBrithday(String brithday) {
this.brithday = brithday;
}
}
<%@page import="com.SSHC.Person"%>
<%@page import="java.util.ArrayList"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html;
charset=UTF-8" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"
+request.getServerName()+":"+request.getServerPort()
+path+"/";
String []arrName={"诗书画唱1","诗书画唱2","诗书画唱3"};
String []arrSex={"男","男","男"};
String []arrBrithday={"2000-01-01",
"2000-01-02","2000-01-03"};
List<Person> list = new ArrayList<Person>();
for(int i=0;i<arrName.length;i++){
//这里的Person p= new Person();
//必须写里面因为要生成3个对象，放到集合里面
//，如果写外面，就只是一个对象，默认取每个数组的
//最后一个当每个属性的值等。
Person p= new Person();
p.setName(arrName[i]);
p.setSex(arrSex[i]);
p.setBrithday(arrBrithday[i]);
list.add(p);
}
%>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content=
"keyword1,keyword2,keyword3">
<meta http-equiv="description"
content="This is my page">
</head>
<body>
<table border="1">
<tr>
<th>姓名</th>
<th>性别</th>
<th>生日</th>
</tr>
<%
for(int j = 0;j < list.size();j ++) {
Person pro = list.get(j);
%>
<tr>
<td><%=pro.getName() %></td>
<td><%=pro.getSex() %></td>
<td><%=pro.getBrithday() %></td>
</tr>
<%
}
%>
</table>
</body>
</html>
修改端口号的方法（可能只能用Tomcat的文件夹中的文件来修改）：
info
信息
package-info：
https://www.sogou.com/link?url=hedJjaC291OfPyaFZYFLI4KQWvqt63NBNT7omtTV3RuN56nw9WfFxQ..
