Is there any PHP print_r($_REQUEST) equivalent in Servlet??
Hi friends,
Is there any PHP print_r($_REQUEST) equivalent in Servlet??
The system.out calls will print to the server logs, just read them. It's somewhere in a straightforward named folder in the appserver root folder, like /logs. I thought it were for debugging purposes.
At least, Servlets are not meant to output HTML. Use JSP for that. It's a view technology providing a template for HTML.
Replace your servlet's code by:public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException {
// Do some preprocessing logic here?
// Forward request to page.jsp.
request.getRequestDispatcher("page.jsp").forward(request, response);
}and create a `page.jsp` which look like this:<!doctype html>
<html lang="en">
<head>
<title>Show post key-value</title>
<style>
body { background: #fdf5e6; }
h1 { text-align: center; }
</style>
</head>
<body>
<h1>Show post key-value</h1>
<ul>
<li><strong>param1</strong>: ${param.param1}</li>
<li><strong>param2</strong>: ${param.param2}</li>
<li><strong>param3</strong>: ${param.param3}</li>
</ul>
</body>
</html>Or if you don't know the parameter names beforehand, then make use of [JSTL's c:forEach|http://java.sun.com/products/jsp/jstl/1.1/docs/tlddocs/c/forEach.html] (to install JSTL, just drop [jstl-1.2.jar|http://download.java.net/maven/1/jstl/jars/jstl-1.2.jar] in /WEB-INF/lib):<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!doctype html>
<html lang="en">
<head>
<title>Show post key-value</title>
<style>
body { background: #fdf5e6; }
h1 { text-align: center; }
</style>
</head>
<body>
<h1>Show post key-value</h1>
<ul>
<c:forEach items="${param}" var="p">
<li><strong>${p.key}</strong>: ${p.value}</li>
</c:forEach>
</ul>
</body>
</html>That said, please throw away the ancient HTML/CSS/JSP/Servlet tutorials/books you're reading and go get a more recent one. The coding practices you're showing off are discouraged over a decade.
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