OGLL小応用−動的数学式計算
OGLL解析器:
サーブレットのテスト:
テストJSP:
テスト例:
(1.12+13.4)/3.1*1.7
結果:
7.96258064516129
import ognl.Ognl;
import ognl.OgnlContext;
import ognl.OgnlException;
public class OgnlExpression {
/* */
private Object expression;
/* expressionString OGNL */
public OgnlExpression(String expressionString) throws OgnlException {
super();
/* Ognl , */
expression = Ognl.parseExpression(expressionString);
}
/* */
public Object getExpression() {
return expression;
}
/* Ognl */
// 1: .
// 2:
public Object getValue(OgnlContext context, Object rootObject)throws OgnlException {
/* */
return Ognl.getValue(getExpression(), context, rootObject);
}
}
サーブレットのテスト:
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import ognl.OgnlContext;
public class Test extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
// OGNL
OgnlContext context = new OgnlContext();
//
OgnlExpression expr = new OgnlExpression(request.getParameter("test"));
/* */
System.out.println(expr.getValue(context, context));
System.out.println(" ：" + expr.getExpression());
} catch (Exception e) {
throw new RuntimeException();
}
}
}
テストJSP:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<form action="test" method="post">
<input type="text" name="test" />
<input type="submit" />
</form>
</body>
</html>
テスト例:
(1.12+13.4)/3.1*1.7
結果:
7.96258064516129