How Can I Efficiently Escape HTML Symbols in Java?

Efficient Escaping of HTML Symbols in Java Code

When displaying HTML content in Java, it's imperative to escape specific characters like <, >, ", and & to prevent malicious code execution. Manual string replacements, however, can be cumbersome and error-prone.

Recommended Method: StringEscapeUtils from Apache Commons Lang

The Apache Commons Lang library offers a comprehensive solution for escaping HTML characters with its StringEscapeUtils class. It provides efficient methods to escape and unescape multiple characters simultaneously, ensuring code readability and accuracy.

Usage:

To escape HTML characters in Java using StringEscapeUtils, follow these simple steps:

1. Import the Required Class:

   import static org.apache.commons.lang.StringEscapeUtils.escapeHtml;

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2. Define the Input String:

   String source = "The less than sign (<) and ampersand (&amp;) must be escaped before using them in HTML";

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3. Escape HTML Characters:

   String escaped = escapeHtml(source);

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Example:

Using the StringEscapeUtils class, you can easily escape HTML characters as shown below:

import static org.apache.commons.lang.StringEscapeUtils.escapeHtml;
// ...
String source = "The less than sign (<) and ampersand (&amp;) must be escaped before using them in HTML";
String escaped = escapeHtml(source);
System.out.println(escaped); // Output: The less than sign (&lt;) and ampersand (&amp;) must be escaped before using them in HTML

Note for Apache Commons Lang Version 3:

For Apache Commons Lang version 3, use the escapeHtml4 method instead of escapeHtml.

import static org.apache.commons.lang3.StringEscapeUtils.escapeHtml4;
// ...
String escaped = escapeHtml4(source);

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