BAEL-5732 Initial code changes for Unescaping html entities/chars.

Author: adalagandev

spring-core-4/README.md

@@ -7,4 +7,5 @@ This module contains articles about core Spring functionality
 - [Creating Spring Beans Through Factory Methods](https://www.baeldung.com/spring-beans-factory-methods)
 - [Spring BeanPostProcessor](https://www.baeldung.com/spring-beanpostprocessor)
 - [Escape HTML Symbols in Java](https://www.baeldung.com/java-escape-html-symbols)
+- [Unescape HTML Symbols in Java](https://www.baeldung.com/unescape-html-characters-in-java)
 - More articles: [[<-- prev]](/spring-core-3)

spring-core-4/pom.xml

@@ -70,6 +70,11 @@
             <artifactId>commons-text</artifactId>
             <version>${commons-text.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.unbescape</groupId>
+            <artifactId>unbescape</artifactId>
+            <version>1.1.6.RELEASE</version>
+        </dependency>
     </dependencies>
 
     <properties>
@@ -80,4 +85,4 @@
         <commons-text.version>1.10.0</commons-text.version>
     </properties>
 
-</project>
+</project>

spring-core-4/src/main/java/com/baeldung/Unescapehtml/HtmlUnescapeUtils.java

@@ -0,0 +1,19 @@
+package com.baeldung.Unescapehtml;
+
+import org.apache.commons.text.StringEscapeUtils;
+import org.springframework.web.util.HtmlUtils;
+import org.unbescape.html.HtmlEscape;
+
+public class HtmlUnescapeUtils {
+    public static String unescapeWithApacheCommons(String htmlInput) {
+        return StringEscapeUtils.unescapeHtml4(htmlInput);
+    }
+
+    public static String unescapeWithSpring(String htmlInput) {
+        return HtmlUtils.htmlUnescape(htmlInput);
+    }
+
+    public static String unescapeWithUnbescape(String htmlInput) {
+        return HtmlEscape.unescapeHtml(htmlInput);
+    }
+}

spring-core-4/src/test/java/com/baeldung/unescapehtml/HtmlUnescapeUtilsTest.java

@@ -0,0 +1,44 @@
+package com.baeldung.unescapehtml;
+
+import org.junit.Assert;
+import org.testng.annotations.Test;
+
+import com.baeldung.Unescapehtml.HtmlUnescapeUtils;
+
+public class HtmlUnescapeUtilsTest {
+    @Test
+    public void givenAStringWithEscapedAmpersand_whenConverted_thenUnescape() {
+        String escapedText = "&";
+        String expectedText = "&";
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithApacheCommons(escapedText));
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithSpring(escapedText));
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithUnbescape(escapedText));
+
+        escapedText = "&";
+        expectedText = "&";
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithApacheCommons(escapedText));
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithSpring(escapedText));
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithUnbescape(escapedText));
+    }
+
+    @Test
+    public void givenAStringWithDoubleQuotes_whenConverted_thenUnescape() {
+        String expectedText = "\"Hello\" Baeldung";
+        String escapedText = ""Hello" Baeldung";
+
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithApacheCommons(escapedText));
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithSpring(escapedText));
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithUnbescape(escapedText));
+    }
+
+    @Test
+    public void givenAStringWithHtmlSymbols_whenConverted_thenUnescape() {
+        String expectedText = "<p><strong>Test sentence in bold type.</strong></p>";
+        String escapedText = "&lt;p&gt;&lt;strong&gt;Test sentence in bold type.&lt;/strong&gt;&lt;/p&gt;";
+
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithApacheCommons(escapedText));
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithSpring(escapedText));
+        Assert.assertEquals(expectedText, HtmlUnescapeUtils.unescapeWithUnbescape(escapedText));
+    }
+
+}