File Name: read and write file in java.zip
It offers numerous methods for you to render PDF elements such as text, images, shapes, forms, watermarks, and annotations on to documents. To create a new document, you create a PdfDocument object. After you create a new PdfDocument object, the writeText method will allow you write text on a page, which is created by default in the document.
When programming, whether you're creating a mobile app, a web application, or just writing scripts, you often have the need to read or write data to a file. This data could be cache data, data you retrieved for a dataset, an image, or just about anything else you can think of. In this tutorial, we are going to show the most common ways you can read and write to files in Java. Before we get in to some actual examples, it would help to understand the classes available to you that will handle the reading and writing of data to files.
Java programmers sometimes need to create document files of their application data to showcase business information or create a report that can be exchanged or printed without messing with the data layout and format.
PDF is an ideal file format that can reliably do that independent of software hardware and operating system. This article delves into the tool called iText, which enables a Java programmer to create PDF documents through Java code.
John Edward Warnock , , co-founder of Adobe Systems. The goal was to enable anyone to capture documents from any application as an electronic version for document exchange. It stood the test of time and became a trusted format of electronic document exchange down the years.
A PDF document can contain various elements and not just mere text—such as links and buttons, form fields, audio, video, and business logic. However, today there are many other open source PDF applications that can be used to create, read, and write PDF file format. The popular Microsoft Office and LibreOffice collections have options to export their documents in this format.
The iText is a Java library that enables a developer to generate and manipulate PDF documents through Java code on the fly.
The library offers some powerful features to generate read-only, platform-independent documents which contain not only text but also lists, tables, and images. This library is particularly useful to create a consistent look-and-feel document; otherwise, what Java can do best is create an HTML page which is browser dependent.
The API comes quite handy and has almost flat learning curve. The iText has a version that works with the. NET framework as well. For an iText library to work with Java, it requires Java version 5 and above.
Here are the dependencies one needs to add into pom. Intuitively, a PDF file is a container for documents and an iText Document class is the default root element. It provides methods that work with the page size setting, page rotating, adding elements, and writing text according to specific co-ordinates. Because this class has no idea of the actual PDF format and their syntaxes, the library provides a subclass of Document , called the PdfDocument class. An instance of this class provides the entry point to work with the PDF document.
This class provides the necessary functionalities to work with the PDF document, such as adding pages, font, and events; copying pages from one document to another; extracting document information; and so forth To open a PDF document for writing, it must be opened in association with a PdfWriter instance. In a similar manner, a PDF document to be opened for reading and parsing must be opened in association with an PdfReader instance.
The PdfWriter is subscribing to the Java core class java. OutputStream and PdfReader to java. They are both defined in the package named com. The PdfReader supplies five constructors, such as:. The library provides the necessary functionalities to read and write byte information according to the rules of the PDF document.
This is a very simple and rudimentary example to illustrate the ideas discussed earlier. The code is self-explanatory. The API documentation of iText 7 can be found in this link.
The preceding data also can be stated in a tabular format, as follows. The code has been elaborated to make it more comprehensible. Perhaps the most significant aspect of this library is that we are able to create a PDF document without having to know much about the intricacies of the PDF specification. The specification is huge and complex because it envelops much more than text, such as cross-reference tables, graphics, links, file attachment, rich media, and so on.
The library, however, is limited in its support but nonetheless provides the essential features to create a PDF document programmatically. The API is intuitive and simple to learn. In most cases, developers do not need to create PDF documents that are complex. But, as the library develops, it is going to fill in the missing spots of the specification. The iText developer home page offers extensive examples on various features of the library.
There are numerous classes available to deal with various other aspects of the PDF format. This article simply scratched the surface to give a taste of what the library offers in general. Visit the links below to get a more comprehensive example on this. Email Article Print Article. Enterprise Development Update. Most Popular Developer Stories. Today This Week All-Time. Most Commented On. Acceptable Use Policy. Advertiser Disclosure:. Thanks for your registration, follow us on our social networks to keep up-to-date.
So why not learn in easy way? So if you are a java developer or data scientist , This article is a must read content for you —. Both of them are member of java. You can directly import and call them. Of Course the while loop contains some logical part. Here the —.
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Java programmers sometimes need to create document files of their application data to showcase business information or create a report that can be exchanged or printed without messing with the data layout and format. PDF is an ideal file format that can reliably do that independent of software hardware and operating system. This article delves into the tool called iText, which enables a Java programmer to create PDF documents through Java code.
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The following tutorial will show how to create PDF files with iText. This tutorial assumes that you have basis Java and Eclipse knowledge. The smallest text unit is a "Chunk" which is a String with a pre-defined font.
The canonical reference for building a production grade API with Spring. If you have a few years of experience in the Java ecosystem, and you're interested in sharing that experience with the community and getting paid for your work of course , have a look at the "Write for Us" page. Cheers, Eugen. The latest version of the libraries can be found here: iText and PdfBox.
These code examples are categorized into multiple sections based on the work they do OR functionality they achieve. With each java pdf example , I have attached a snapshot of PDF file so that you can visualize what exactly code is writing in PDF file. You may extend these examples to get text from database or some API response in json and write to pdf. I have tried to put as many examples as I found useful to put here to help you all while you work on pdf files in Java. Through given examples use simple java programs, you can reuse this code in web applications.
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