POST method and passing parameters

Step 1: Passing data using parameters in GET method:

package com.gs.controller;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class XmlServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		System.out.println("Hello from Get method of XML servlet");
		response.setContentType("text/html");
		String userName =  request.getParameter("userName");
		PrintWriter printWriter = response.getWriter();
		printWriter.println("Hello from GET method "+userName);

	}

}

Step 2: Hit the URL and add the parameter as "?userName=Mohit"

Step 3: In order to test POST create a simple html form:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	Hello World
	<form method="post" action="xmlservletpath">
		<input name="userName" /> 
		<input type="submit" />
	</form>
</body>
</html>

Step 4: Create doPost method in servlet:

package com.gs.controller;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class XmlServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		System.out.println("Hello from Get method of XML servlet");
		response.setContentType("text/html");
		String userName = request.getParameter("userName");
		PrintWriter printWriter = response.getWriter();
		printWriter.println("Hello from GET method " + userName);

	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		System.out.println("Hello from POST method of XML servlet");
		response.setContentType("text/html");
		String userName = request.getParameter("userName");
		PrintWriter printWriter = response.getWriter();
		printWriter.println("Hello from POST method " + userName);

	}

}

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Last updated 6 years ago

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<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> Hello World <form method="post" action="xmlservletpath"> <input name="userName" /> <input type="submit" /> </form> </body> </html>

package com.gs.controller; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class XmlServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("Hello from Get method of XML servlet"); response.setContentType("text/html"); String userName = request.getParameter("userName"); PrintWriter printWriter = response.getWriter(); printWriter.println("Hello from GET method " + userName); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("Hello from POST method of XML servlet"); response.setContentType("text/html"); String userName = request.getParameter("userName"); PrintWriter printWriter = response.getWriter(); printWriter.println("Hello from POST method " + userName); } }