How to implement document processing and content analysis using PHP and Apache Tika

As the digitalization process of enterprises continues to advance, there are increasing demands for processing and content analysis of various documents. In this process, PHP, as a relatively widely used server scripting language, is increasingly recognized and loved for its ease of use and rapid development. Apache Tika, as a powerful document processing and content analysis tool, has attracted much attention. This article will introduce how to use PHP and Apache Tika to implement document processing and content analysis.

1. What is Apache Tika?

Apache Tika is an open source toolset for document processing and content analysis. It can help people extract text, metadata and other information from various documents, and is a very powerful content analysis tool. The document formats it supports include: PDF, Word, Excel, PowerPoint, HTML, XML, PlainText, etc. At the same time, Apache Tika also provides APIs in various programming languages, including Java, Python, Ruby, .NET, etc. This article mainly introduces how to use PHP and Apache Tika to implement document processing and content analysis. There are two ways to install Apache Tika:

1. Download the Apache Tika binary file.

Official website address: https://tika.apache.org/download.html
After downloading, unzip it to a directory, such as the directory "/opt/tika".

2. Use Maven to install.

The easiest way to install Apache Tika through Maven is through a valid pom.xml configuration file, the content of which is as follows:

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0 org.apache.tika tika-parsers 1.26

二, How to use PHP to call Apache Tika for document processing and content analysis?

Tika is written in Java, so calling Tika using PHP usually requires the use of a Java bridge. There are two main ways to bridge PHP and Java:

1. Use PHP-Java Bridge.

PHP-Java Bridge provides a PHP extension that allows PHP programs to call Java APIs. It sends the message to the Java Bridge server through the HTTP protocol, and then forwards the message to the Java VM. After the Java program responds, the result is returned to the PHP-Java Bridge server, and the server returns the result to the PHP program. This is the basic working principle of PHP-Java Bridge.

2. Use the JavaBridge.php file for bridging.

The JavaBridge.php file also communicates with the Java VM through the HTTP protocol. The JavaBridge.php file does not require additional PHP extensions and is more convenient to use.

The following is how to use PHP-Java Bridge:

1. Download PHP-Java Bridge.
Official website address: http://www.php-java-bridge.org/

2. Unzip and install PHP-Java Bridge.

Extract and copy the decompressed folder to the web directory of the server, for example, to the directory "/var/www/html/JavaBridge".

3. Start the Java Bridge server.

Execute the following command to start the Java Bridge server:

cd /var/www/html/JavaBridge/
sudo ./php-java-bridge-7.0.0.jar start

After successful startup, you will see the following information:

[INFO - 2017-08-07T01:47:23.727000Z] php.java.bridge.AbstractJavaBridge.init() php.java. bridge.version = 7.0.0
[INFO - 2017-08-07T01:47:23.732000Z] php.java.bridge.AbstractJavaBridge.init() php.java.bridge.home = /home/user/projects/ php-java-bridge
[...]

4. Call Tika in the PHP program.

In the PHP program, include the JavaBridge.php file and use Java Bridge to create a Java object. The sample code is as follows:

require_once('/var/www/html/JavaBridge/java/Java.inc');

// Create a new Tika object
$tika = new Java ('org.apache.tika.Tika');

// Parse document content
$content = $tika->parseToString(new Java('java.io.File', '/path /to/document.pdf'));

The above code will print the parsed document content.

Here's how to use the JavaBridge.php file for bridging:

1. Download JavaBridge.jar.
Official website address: http://php-java-bridge.sourceforge.net/pjb/download.html

2. Copy JavaBridge.jar to the server/lib directory in the Tika decompression directory.

3. Call Tika in the PHP program.

In the PHP program, include the JavaBridge.php file and use Java Bridge to create a Java object. The sample code is as follows:

require_once('/path/to/JavaBridge.php');

// Create a new Tika object
$tika = new Java('org.apache. tika.Tika');

// Parse document content
$content = $tika->parseToString(new Java('java.io.File', '/path/to/document.pdf '));

The above code will print the parsed document content.

3. How to implement document processing and content analysis?

1. Get document information.

First, you need to obtain the document information, including document type, size, creation date, modification date, etc. The following is a sample code to get the document type:

$type = $tika->detect(new Java('java.io.File', '/path/to/document.pdf'));

The following is a sample code to get the document size:

$size = (new Java('java.io.File', '/path/to/document.pdf'))-> length();

The following is a sample code to get the document creation date and modification date:

$metadata = $tika->parseMetaData(new Java('java.io.File', '/path/to/document.pdf'));

echo "创建日期：" . $metadata->get('Creation-Date') . "
";
echo "修改日期：" . $metadata->get('Modify-Date') . "
";

2.提取文本内容。

使用Tika提取文档的文本内容非常简单，只需要将文档文件的路径传递给parseToString()方法即可。以下是代码示例：

$content = $tika->parseToString(new Java('java.io.File', '/path/to/document.pdf'));

3.提取标签信息。

使用Tika提取文档的标签信息也非常容易，只需要传递一个参数给parseToString()方法。以下是代码示例：

$content = $tika->parseToString(new Java('java.io.File', '/path/to/document.pdf'),

new Java('org.apache.tika.parser.html.HtmlMapper'));

4.提取元数据信息。

使用Tika提取文档的元数据非常容易，只需要调用Tika的parseMetaData()方法即可。以下是代码示例：

$metadata = $tika->parseMetaData(new Java('java.io.File', '/path/to/document.pdf'));

echo "标题：" . $metadata->get('title') . "
";
echo "作者：" . $metadata->get('creator') . "
";
echo "关键字：" . $metadata->get('keywords') . "
";
echo "主题：" . $metadata->get('subject') . "
";

5.生成HTML、XML、JSON等格式的文档。

使用Tika生成HTML、XML、JSON等格式的文档非常容易，在生成时只需要指定输出格式即可。以下是代码示例：

$html = $tika->parseToString(new Java('java.io.File', '/path/to/document.pdf'),

new Java('org.apache.tika.parser.html.HtmlMapper'));

$xml = $tika->parseToString(new Java('java.io.File', '/path/to/document.pdf'),

new Java('org.apache.tika.parser.xml.XMLResult'));

$json = $tika->parseToString(new Java('java.io.File', '/path/to/document.pdf'),

new Java('org.apache.tika.parser.JSON.JSONResult'));

总结：

本文介绍了使用PHP和Apache Tika实现文档处理和内容分析的方法。通过调用Tika的API，可以轻松地从各种文档中提取文本、元数据、标签等信息，并生成HTML、XML、JSON等格式的文档。这种方式充分利用了PHP和Tika的优势，让人们能够更加快速、高效地处理和分析文档内容。

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