Convert EML to JPEG in Java & J2SE Applications

How to Convert EML to JPEG in Java

Perform EML to JPEG file conversion in Java using three simple steps. View the converted document as HTML without any external software dependency.

Create a new instance of Converter class and load the EML file
Set ConvertOptions for the JPEG document type
Call Convert method of Converter class instance for conversion to JPEG
Set options for HTML viewer
Create Viewer object to view converted JPEG as HTML

Free App for EML to JPEG Conversion

	// Supported file formats: https://docs.groupdocs.com/conversion/java/supported-document-formats/

	Converter converter = new Converter("input.docx");

	ConvertOptions convertOptions = new FileType().fromExtension("pdf").getConvertOptions();

	converter.convert("output.pdf", convertOptions);

	try (Viewer viewer = new Viewer("output.pdf"))
	{
	HtmlViewOptions viewOptions = HtmlViewOptions.forEmbeddedResources("output{0}.html");

	viewer.view(viewOptions);
	}

view raw word-to-pdf-conversion.java hosted with ❤ by GitHub

Convert Password Protected EML to JPEG

Accurately load and convert documents that are protected with a password within your Java based applications. The file format conversion API also supports rendering remote documents from different sources including S3, Blob, FTP, Stream, URL or a local disk.

Create new instance of Converter class and pass source document path
Instantiate the proper ConvertOptions class e.g. (PdfConvertOptions, WordProcessingConvertOptions, SpreadsheetConvertOptions etc.)
Call convert method of Converter class instance and pass filename for the converted document

Source Document Information Extraction

The documents information extraction feature not only allows getting the basic information about the source document file but it also supports extracting some valuable file-format specific information such as project start and end dates of a Microsoft Project file, any printing restrictions on a PDF document, list of folders enclosed in an Outlook data file etc.

Convert popular document file formats on different operating systems such as Windows, Linux or macOS while using development environments such as NetBeans, IntelliJ IDEA and Eclipse.

	// Supported file formats: https://docs.groupdocs.com/conversion/java/supported-document-formats/

	WordProcessingLoadOptions loadOptions = new WordProcessingLoadOptions();
	loadOptions.setPassword("12345");

	Converter converter = new Converter("input.docx", loadOptions);

	PdfConvertOptions options = new PdfConvertOptions();

	converter.convert("output.pdf, options);

view raw password-protected-word-document-to-pdf-conversion.java hosted with ❤ by GitHub

Convert Specific Word Pages to PDF in Java

Java document conversion API allows you to choose selected pages from the source document and accurately convert to the supported document format. The code example below shows how to convert the 1st and 4th pages of a Word document to the resultant PDF file.

Create a new instance of Converter class and load input (Word) document
Instantiate the proper ConvertOptions class e.g. (PdfConvertOptions, WordProcessingConvertOptions, SpreadsheetConvertOptions etc)
Set setPages property of the ConvertOptions instance and mention specific page number to be converted
Call convert method of Converter class instance and pass filename (PDF) for the converted document

Caching Converted Document Results

In some cases, the converted document size is bigger and it takes time to be converted. The document conversion library offers the caching feature to efficiently manage such situations and speed up the repetitive conversion process. Enable the ICache interface to work with custom cache implementation using the extension point and control the cache conversion, as you prefer.

The conversion result is saved to the local drive by default but any type of cache storage can be supported by implementing the appropriate interfaces such as Amazon S3, Dropbox, Google Drive, Windows Azure, Reddis or any other.

	// Supported file formats: https://docs.groupdocs.com/conversion/java/supported-document-formats/

	Converter converter = new Converter("input.docx");

	PdfConvertOptions options = new PdfConvertOptions();

	options.setPages(Arrays.asList( 1, 4));

	converter.convert("output.pdf", options);

view raw convert-specific-word-document-pages-to-pdf.java hosted with ❤ by GitHub

What is EML file format?

The EML file is a type of email message that includes both the message content and the email header information. It is an extension of the Mime (Multipurpose Internet Mail Extensions) format and is used in most email clients, including Microsoft Outlook and Mozilla Thunderbird. EML files are used to save an email message before it is sent and can also be used to archive emails. The EML file format is an XML-structured file that is used to store the header information, such as sender, recipient, subject line, and date, as well as the message content, such as body text, HTML, images, and attachments. The header information is stored in the header of the file and the content is stored in the body. The file is readable by both humans and computers, and can be opened in a text editor, such as Notepad or TextEdit. EML files are commonly used to transfer emails between different email systems. For example, when an email is sent from one email client to another, the email is usually saved as an EML file and then transferred over the internet. This ensures that the message is delivered properly. The EML file format is also used to store emails in an archive. For example, emails can be archived in an EML file and then later opened and read in any compatible email client. This makes it easy to keep emails organized and backed up. In addition to being used for email messages, the EML file format is also used by some applications to store log files, document files, and other types of files.

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What is JPEG file format?

JPEG, short for Joint Photographic Experts Group, represents a lossy compression algorithm meticulously crafted to minimize the storage size of digital images. Renowned for its widespread usage in still images and graphics, it holds a prominent position on the web and in digital cameras. Operating on the principle of content analysis, JPEG meticulously measures and evaluates the image’s content before proceeding to compress it, thereby reducing the overall file size. The level of compression can be adjusted to cater to the desired image quality. While JPEG compression typically yields images with lower quality, it achieves remarkably small file sizes, rendering it perfect for online photo sharing.

JPEG’s exceptional popularity is primarily attributed to its ability to strike a balance between image quality and file size. By employing lossy compression techniques, JPEG effectively eliminates certain visual information that may not be noticeable to the human eye. This selective discarding of data ensures substantial reduction in file size while preserving the overall visual integrity to an acceptable level. Consequently, JPEG files are compact and highly efficient in terms of storage and transmission, making them ideal for web-based applications where bandwidth and storage limitations are prevalent.

The adjustable nature of JPEG compression further enhances its versatility. Users have the flexibility to determine the trade-off between file size and image quality by adjusting the compression settings. In scenarios where high image fidelity is of paramount importance, a lower compression level can be selected to preserve intricate details and minimize visual artifacts. Conversely, when the emphasis is on minimizing file size without significant loss in perceived quality, a higher compression level can be applied. This adaptability allows users to tailor the JPEG compression to their specific requirements, ensuring an optimal balance between file size and image quality.

It is noteworthy that while JPEG excels in the realm of digital image compression, it may not be the most suitable choice for all scenarios. Due to its lossy nature, repeatedly compressing and decompressing JPEG files can result in a cumulative loss of image quality. Therefore, it is advisable to exercise caution and refrain from excessive re-compression if preserving the highest possible image fidelity is paramount.

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