JSP基本语法

小波

2年前发布

150

文章目录[隐藏]

基本语法
案例

基本语法

<% 放java方法/定义变量 %>：这个里面可以定义变量，也可以写if和for这类的逻辑语句。


<% if (day <= 5 && day >= 1) {%>
       <p>今天非周末</p>
    <%}else{%>
      <p>今天是周末</p>
    <%} %>
或
<% if (day <= 5 && day >= 1) {
   String a = "今天非周末";
    }else{
   String a = "今天是周末";
    } %>
<% if (day <= 5 && day >= 1) {%>
       <p>今天非周末</p>
    <%}else{%>
      <p>今天是周末</p>
    <%} %>
或
<% if (day <= 5 && day >= 1) {
   String a = "今天非周末";
    }else{
   String a = "今天是周末";
    } %>
<% if (day <= 5 && day >= 1) {%>
       <p>今天非周末</p>
    <%}else{%>
      <p>今天是周末</p>
    <%} %>
或
<% if (day <= 5 && day >= 1) {
   String a = "今天非周末";
    }else{
   String a = "今天是周末";
    } %>

<%= 输出变量 %>：这个语法用于在 JSP 页面中输出 Java 变量的值。


<h1>欢迎, <%= name %>加入造梦论坛!</h1>
<h1>欢迎, <%= name %>加入造梦论坛!</h1>
<h1>欢迎, <%= name %>加入造梦论坛!</h1>

<%! 放java方法/定义全局变量 %>：这个语法可以定义类和各种方法。


public  String desc(int day){
    if (day <= 5 && day >= 1) {
        return "非周末";
    }else{
        return "今天周末";
    }
}
public  String desc(int day){
    if (day <= 5 && day >= 1) {
        return "非周末";
    }else{
        return "今天周末";
    }
}
public  String desc(int day){
    if (day <= 5 && day >= 1) {
        return "非周末";
    }else{
        return "今天周末";
    }
}

案例

输出一次比一次大的文字：


<% for (int i = 1 ; i <=5 ; i++){%>
    <p style="font-size:<%=i*10%>px">造梦论坛</p>
<%}%>
<% for (int i = 1 ; i <=5 ; i++){%>
    <p style="font-size:<%=i*10%>px">造梦论坛</p>
<%}%>
<% for (int i = 1 ; i <=5 ; i++){%>
    <p style="font-size:<%=i*10%>px">造梦论坛</p>
<%}%>

在第一题的基础上加上随机色：


<% for (int i = 1 ; i <=10 ; i++){%>
<% String[] color = {"Pink","Fuchsia","Cyan","Green","Coral"};
%>
<p style="font-size:<%=i*10%>px;color: <%= color[i% color.length]%>">造梦论坛</p>
<%}%>
<% for (int i = 1 ; i <=10 ; i++){%>
<% String[] color = {"Pink","Fuchsia","Cyan","Green","Coral"};
%>
<p style="font-size:<%=i*10%>px;color: <%= color[i% color.length]%>">造梦论坛</p>
<%}%>
<% for (int i = 1 ; i <=10 ; i++){%>
<% String[] color = {"Pink","Fuchsia","Cyan","Green","Coral"};
%>
<p style="font-size:<%=i*10%>px;color: <%= color[i% color.length]%>">造梦论坛</p>
<%}%>

随机颜色的九九乘法表：


<style>
    table{
        border-collapse: collapse;
    }
    td{
        border: 1px black dashed;
        background-color: #e7e7e7;
        padding: 5px;
        margin: 0;
    }
</style>
<table>
    <% for (int i = 1; i <= 9 ; i++) { %>
    <tr>
<% for (int j = 1; j <=i ; j++) { %>
        <% String[] color = {"Pink","Fuchsia","Cyan","Green","Coral","Gold"}; %>
<td class="box" style="color: <%= color[(j+i)% color.length]%>"> <%= i %>X<%= j%>=<%= i*j %></td>
<% } %>
    </tr>
    <% } %>
</table>
<style>
    table{
        border-collapse: collapse;
    }
    td{
        border: 1px black dashed;
        background-color: #e7e7e7;
        padding: 5px;
        margin: 0;
    }
</style>
<table>
    <% for (int i = 1; i <= 9 ; i++) { %>
    <tr>
<% for (int j = 1; j <=i ; j++) { %>
        <% String[] color = {"Pink","Fuchsia","Cyan","Green","Coral","Gold"}; %>
<td class="box" style="color: <%= color[(j+i)% color.length]%>"> <%= i %>X<%= j%>=<%= i*j %></td>
<% } %>
    </tr>
    <% } %>
</table>
<style>
    table{
        border-collapse: collapse;
    }
    td{
        border: 1px black dashed;
        background-color: #e7e7e7;
        padding: 5px;
        margin: 0;
    }
</style>
<table>
    <% for (int i = 1; i <= 9 ; i++) { %>
    <tr>
<% for (int j = 1; j <=i ; j++) { %>
        <% String[] color = {"Pink","Fuchsia","Cyan","Green","Coral","Gold"}; %>
<td class="box" style="color: <%= color[(j+i)% color.length]%>"> <%= i %>X<%= j%>=<%= i*j %></td>
<% } %>
    </tr>
    <% } %>
</table>

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