jsp if else语句使用方法

if else在大部份编程语言中都是这样使用的，我们今天来简单的介绍一下关于jsp教程中的if else 与多重条件判断。

<HTML>
<HEAD>
    <TITLE>Using the if Statement</TITLE>
</HEAD>

<BODY>
    <H1>Using the if Statement</H1>
    <%
        int value = 10;

        if(value > 0)
            out.println("Absolute value of " + value + " = " + value);
    %>
</BODY>
</HTML>

简单对比

<HTML>
<HEAD>
    <TITLE>Using Compound Statements</TITLE>
</HEAD>

<BODY>
    <H1>Using Compound Statements</H1>
    <%
        int value = 10;

        if(value > 0) {
            out.println("The number was positive.");
            out.println("Absolute value of " + value + " = " + value);
        }
    %>
</BODY>
</HTML>

if else

<HTML>
<HEAD>
    <TITLE>Nested if Statements</TITLE>
</HEAD>

<BODY>
    <H1>Nested if Statements</H1>
    <%
        double value = 2;

        if (value != 0) {
            if (value > 0)
               out.println("The result = " + (1 / value));
            else
               out.println("Sorry, we need a positive number.");
        }
    %>
</BODY>
</HTML>

多个条件if else

<HTML>
<HEAD>
    <TITLE>Using an if-else Ladder</TITLE>
</HEAD>

<BODY>
    <H1>Using an if-else Ladder</H1>
    <%
        String day = "Friday";

        if(day == "Monday")
            out.println("It's Monday.");
        else if (day == "Tuesday")
            out.println("It's Tuesday.");
        else if (day == "Wednesday")
            out.println("It's Wednesday.");
        else if (day == "Thurssday")
            out.println("It's Thursday.");
        else if (day == "Friday")
            out.println("It's Friday.");
        else if (day == "Saturday")
            out.println("It's www.zhutiai.com/5230/ Saturday.");
        else if (day == "Sunday")
            out.println("It's Sunday.");
    %>
</BODY>
</HTML>

补充：Jsp教程,Jsp/Servlet开发工具