basic-arithmetic.jsp

来自「java很好的例子」· JSP 代码 · 共 88 行

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<html>
  <head>
    <title>JSP 2.0 Expression Language - Basic Arithmetic</title>
  </head>
  <body>
    <h1>JSP 2.0 Expression Language - Basic Arithmetic</h1>
    <hr>
    This example illustrates basic Expression Language arithmetic.
    Addition (+), subtraction (-), multiplication (*), division (/ or div), 
    and modulus (% or mod) are all supported.  Error conditions, like
    division by zero, are handled gracefully.
    <br>
    <blockquote>
      <code>
        <table border="1">
          <thead>
	    <td><b>EL Expression</b></td>
	    <td><b>Result</b></td>
	  </thead>
	  <tr>
	    <td>\${1}</td>
	    <td>${1}</td>
	  </tr>
	  <tr>
	    <td>\${1 + 2}</td>
	    <td>${1 + 2}</td>
	  </tr>
	  <tr>
	    <td>\${1.2 + 2.3}</td>
	    <td>${1.2 + 2.3}</td>
	  </tr>
	  <tr>
	    <td>\${1.2E4 + 1.4}</td>
	    <td>${1.2E4 + 1.4}</td>
	  </tr>
	  <tr>
	    <td>\${-4 - 2}</td>
	    <td>${-4 - 2}</td>
	  </tr>
	  <tr>
	    <td>\${21 * 2}</td>
	    <td>${21 * 2}</td>
	  </tr>
	  <tr>
	    <td>\${3/4}</td>
	    <td>${3/4}</td>
	  </tr>
	  <tr>
	    <td>\${3 div 4}</td>
	    <td>${3 div 4}</td>
	  </tr>
	  <tr>
	    <td>\${3/0}</td>
	    <td>${3/0}</td>
	  </tr>
	  <tr>
	    <td>\${10%4}</td>
	    <td>${10%4}</td>
	  </tr>
	  <tr>
	    <td>\${10 mod 4}</td>
	    <td>${10 mod 4}</td>
	  </tr>
    <tr>
      <td>\${(1==2) ? 3 : 4}</td>
      <td>${(1==2) ? 3 : 4}</td>
    </tr>
	</table>
      </code>
    </blockquote>
  </body>
</html>

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