Java for the Web with Servlets, JSP, and EJB: A Developer's Guide Java Servlet & JSP Cookbook By Hans Bergsten Murach's Java Servlets and JSP. pdf. EJB & JSP: Java On The Edge, Unlimited Edition ISBN: by Lou Marco Your Guide to Cutting-Edge J2EE Programming. JavaServer Pages™ (JSP) is a technology for web application development that has The Java Servlet API, introduced in early , provides a solution to the directories, and mail servers, creating PDF documents and images, and.
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[PDF] DOWNLOAD Java Servlet JSP Cookbook by Bruce W. Perry [PDF] DOWNLOAD Java Servlet JSP Cookbook Epub [PDF] DOWNLOAD. And the longer they are under the same roof, the more those feelings come to the surface. A nice break from the stress of being a parent, and it goes java servlet. With literally hundreds of examples and thousands of lines of code, the Java Servlet and JSP Cookbook yields tips and techniques that any Java web developer.
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O’Reilly Java Servlet and JSP Cookbook
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WordPress Shortcode. Published in: Full Name Comment goes here. Are you sure you want to Yes No. Be the first to like this. No Downloads. Views Total views. Now we are ready with our setup to create first servlet and run it on tomcat server. Provide the apache tomcat directory location and JRE information to add the runtime environment. If Servers tab is not visible. If you have already started the server from terminal.
Now go to the Servers view and create a new server like below image pointing to the above added runtime environment. Again we can click finish or we can check other options through next button. You can directly click Finish button to create the project or you can click on Next buttons to check for other options.
When we click on Finish button. Our first servlet looks like below. HttpServletResponse response throws ServletException. This is the primary reason for introduction of JSPs. You can refresh it to check that Date is dynamic and keeps on changing. Here is our first JSP program that does the same thing like above servlet. After clicking finish. So servlet is used to generate HTML and send it in response.
The final project hierarchy looks like below image in Eclipse. Some of the important work done by web container are: Servlet methods generate the dynamic page and write it to response. Web Container Tomcat is a web container. Once servlet thread is complete. Then it finds the correct servlet based on the URL and creates a thread for the request. Then web server sends the response back to the client.
Then it invokes the servlet service method and based on the HTTP method service method invokes doGet or doPost methods. We will look into Servlets and JSPs in more detail in future posts but before concluding this post. Container takes care of loading the servlets into memory. Because of container. Every JSP in the application is compiled by container and converted to Servlet and then container manages them like other servlets. It will be something like below image. Container also provides utility like JNDI for resource pooling and management.
All these important and complex tasks are done by container and all we need to focus is on our business logic for our applications. So servlets are not initialized for each request and saves time and memory. You can export above dynamic web project as WAR file and unzip it to check the hierarchy. Deployment Descriptor web. Java Servlet Tutorial In the earlier section. Servlet 3. Servlet API Hierarchy 1. HTTPServlet class 5.
Java Servlet and JSP Cookbook. Bruce W. Perry
We also created our first Servlet and JSP web application and executed it on tomcat server. Servlet Interface 2. GenericServlet class 8. RequestDispatcher interface 7. Web Client. ServletRequest interface 5. Servlet Overview 2.
Annotations in Servlet 3 7. CGI vs Servlet 4. ServletResponse interface 6. ServletConfig Interface 3. Servlet Attributes 6. ServletContext interface 4. This tutorial is aimed to provide more details about servlet.
Most of the times. CGI technology has many drawbacks such as creating separate process for each request. When implementing a generic service. CGI technology was used to create dynamic web applications. The javax. Servlet interface. All servlets must implement the javax. The HttpServlet class provides methods. Servlet interface declares the life cycle methods of servlet. The servlet is not ready to process client request until unless init method is finished executing.
The methods declared in this interface are: Servlet Interface javax. Servlet is the base interface of Servlet API. In this section. Also with Servlet 3. All the servlet classes are required to implement this interface.
Java Servlet and JSP Cookbook - O'Reilly.pdf
There are some other interfaces and classes that we should be aware of when working with Servlets. Servlet API Hierarchy javax.
The below diagram shows servlet API hierarchy. Socket connection etc. IOException — This method is responsible for processing the client request. Whenever servlet container receives any request. ServletConfig is used to pass configuration information to Servlet.
ServletResponse res throws ServletException. ServletConfig Interface javax. We can use getServletConfig method to get the ServletConfig object of the servlet. We can provide servlet init parameters in web. We can extend this method in our servlet classes to initialize resources such as DB Connection.
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Servlets usually run in multi-threaded environment. We will look into ServletConfig interface later on. This is like finalize method of a java class.
We can use this method to get the init parameters of servlet defines in deployment descriptor web. The important methods of ServletConfig interface are: If parameter is not present with the name. If there are no init parameters defined. The ServletContext is unique object and available to all the servlets in the web application.
We will look into ServletContext interface in next section. Some of the important methods of ServletContext are: ServletContext interface javax. Servlet engines may also provide context objects that are unique to a group of servlets and which is tied to a specific portion of the URL path namespace of the host. ServletContext interface provides access to web application variables to the servlet. When we want some init parameters to be available to multiple or all of the servlets in the web application.
We can access items whether they reside on the local file system. String getInitParameter String name — This method returns the String value for the init parameter defined with name in web.
We can remove an attribute using public abstract void removeAttribute String paramString method. We can use Enumeration getInitParameterNames to get enumeration of all the init parameter names.
After obtaining a RequestDispatcher. The attribute will be accessible to all the other servlets having access to this ServletContext. ServletRequest interface ServletRequest interface is used to provide client request information to the servlet. We can get enumeration of all the attributes using public abstract Enumeration getAttributeNames method.
Some of the important methods of ServletRequest interface are: Servlet container creates ServletRequest object from client request and pass it to the servlet service method for processing.
String paramString2 — We can use this method to set init parameters to the application. Object paramObject — This method is used to set the attribute with application scope. Some of the important methods in HttpServletResponse are: ServletResponse interface ServletResponse interface is used by servlet in sending response to the client. Servlet container creates the ServletResponse object and pass it to servlet service method and later use the response object to generate the HTML response for client.
String encodeURL java. String getHeader String name — return the value for the specified header. String getServerName — returns the hostname of the server. We can use getParameterNames method to get the enumeration of parameter names for the request. This interface also provide methods for setting and removing attributes.
The child interface of ServletRequest is HttpServletRequest that contains some other methods for session management. String value — used to add a response header with the given name and value. String getParameter String name — This method returns the request parameter as String.
JSP file. ServletConfig and Serializable interface. ServletResponse response — forwards the request from a servlet to another resource servlet. JSP page. One of the important method in GenericServlet class is no-argument init method and we should override this method in our servlet program if we have to initialize some resources before processing any request from servlet. There are two methods defined in this interface: There are methods defined to be overridden by subclasses for different HTTP methods.
This interface is used for servlet communication within the same context. GenericServlet class GenericServlet is an abstract class that implements Servlet. ServletResponse response — includes the content of a resource servlet.
HTML file in the response. JSP or another servlet in the same context. We can also use this to include the content of another resource to the response. Most of the methods defined in this class are only for easy access to common methods defined in Servlet and ServletConfig interfaces. GenericServlet provide default implementation of all the Servlet life cycle methods and ServletConfig methods and makes our life easier when we extend this class.
Annotations in Servlet 3 Prior to Servlet 3. Servlet Attributes Servlet attributes are used for inter-servlet communication. Some of the important Servlet API annotations are: Servlet attributes are different from init parameters defined in web.
This annotation can be used within a WebFilter or WebServlet annotation. Servlet 3 introduced use of java annotations to define a servlet. WebServlet — We can use this annotation with Servlet classes to define init parameters. There are three scopes for servlet attributes — request scope. WebInitParam — This annotation is used to define init parameters for servlet or filter.
We will also see the use of ServletContext init parameters. JSP and servlet that will authenticate the user credentials. We will look into Servlet Filters and Listeners in future articles. Our Final Dynamic Web Project will look like below image. Servlet Login Example Now we are ready to create our login servlet example. WebFilter — This annotation is used to declare a servlet filter. The annotated class MUST implement javax.
I am using Eclipse and Tomcat for the application. This annotation is processed by the container during deployment. WebListener — The annotation used to declare a listener for various types of event. Filter interface. ServletConfig init parameters and RequestDispatcher include and response sendRedirect usage.
Servlets and DispatcherTypes. JSP page code is like below. Here is our login HTML page. Login successful. Below screenshots shows the different pages based on the user password combinations for successful login and failed logins.
Servlet Filters In this section. WebFilter annotation 4. Servlet Filters are pluggable java components that we can use to intercept and process requests before they are sent to servlets and response after servlet code is finished and before container sends the response back to the client.
In the last article. In this article. Filter interface 3. If we want to change the attribute name in future. Some common tasks that we can do with filters are: We will look into various usage of filter. The approach is simple but if we have a lot of servlets and jsps. Servlet Filter Example for Logging and session validation A.
This method is called only once in the lifetime of filter. This method is called only once in the lifecycle of filter and we should initialize any resources in this method. This is a great example of Chain of Responsibility Pattern. FilterChain is used to invoke the next filter in the chain.
ServletResponse paramServletResponse. As I mentioned earlier. This is the method where we can close any resources opened by filter. We can create a Servlet Filter by implementing javax.
Servlets and filters both are unaware of each other and we can add or remove a filter just by editing web. FilterChain paramFilterChain — This is the method invoked every time by container when it has to apply filter to a resource. Filter interface Filter interface is similar to Servlet interface and we need to implement it to create our own servlet filter.
Filter interface lifecycle methods are:Servlet Interface javax. Socket connection etc. String value — used to add a response header with the given name and value. I will define some context init params and listener configuration. There are two methods defined in this interface: Add to cart.