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The ServletResponse represents the response which is sent back to the user. The servlet container creates a ServletResponse object and passes it as an argument to the servlet’s service method.
Important Methods of ServletResponse Interface
- public PrintWriter getWriter() : This method returns a PrintWriter object that can send character text to the client.
- public ServletOutputStream getOutputStream() : This method returns a ServletOutputStream suitable for writing binary data in the response.
- public String getCharacterEncoding() : This method returns the name of the MIME charset used.
- public void setContentType(String type) : Sets the content type of the response being sent as response.
- public int getBufferSize() : This method returns the actual buffer size used for the response. If no buffering is used, this method returns 0.
- public void flushBuffer() : Forces any content in the buffer to be written to the client.
- public void setLocale(Locale loc) : This method sets the locale of the response, if the response has not been committed yet.
- public boolean isCommitted(): This method returns a boolean indicating if the response has been committed.
- public void reset() : Clears the data of the buffer along with the headers and status code.
ServletResponseInterfaceExample.java
package com.javainterviewpoint;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class ServletResponseInterfaceExample implements Servlet
{
public void init(ServletConfig config) throws ServletException {
}
public void destroy() {
}
public void service(ServletRequest request, ServletResponse
response) throws ServletException, IOException
{
//Getting the PrintWriter object
PrintWriter out = response.getWriter();
//Setting the Content type
response.setContentType("text/html");
out.println("Content Type : "+request.getContentType());
//Posting the response back
String name = request.getParameter("name");
out.println("<br>Welcome \""+name+"\"");
}
public String getServletInfo() {
return null;
}
public ServletConfig getServletConfig() {
return null;
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee%20http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>ServletsTutorial</display-name>
<servlet>
<servlet-name>ServletResponseInterfaceExample</servlet-name>
<servlet-class>com.javainterviewpoint.ServletResponseInterfaceExample</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ServletResponseInterfaceExample</servlet-name>
<url-pattern>/ServletResponseInterfaceExample</url-pattern>
</servlet-mapping>
</web-app>index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>RequestInterfaceExample</title>
</head>
<body>
<form action="./ServletResponseInterfaceExample" method = "POST">
Name : <input type="text" name="name"><br>
<input type="submit" value="Submit Form">
<input type="reset" value="Reset Form">
</form>
</body>
</html>Output
Hit on the Url : http://localhost:8080/ServletTutorial/index.jsp
Hit on the Submit button
Content Type : application/x-www-form-urlencoded
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