Fix encoding problem when generating extent reports

src/main/java/com/aventstack/extentreports/io/BufferedWriterWriter.java

@@ -2,7 +2,9 @@
 
 import java.io.BufferedWriter;
 import java.io.File;
-import java.io.FileWriter;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -20,10 +22,12 @@ private WriterInstance() {
     private BufferedWriterWriter() {
     }
 
-    public synchronized void write(final File f, String text) {
-        try (BufferedWriter writer = new BufferedWriter(new FileWriter(f))) {
+    public synchronized void write(final File f, String text, String encoding) {
+        try (BufferedWriter writer = new BufferedWriter(
+                new OutputStreamWriter(
+                        new FileOutputStream(f), encoding))) {
             writer.write(text);
-        } catch (Exception e) {
+        } catch (IOException e) {
             logger.log(Level.SEVERE, f.getPath(), e);
         }
     }

src/main/java/com/aventstack/extentreports/reporter/AbstractFileReporter.java

@@ -69,8 +69,9 @@ protected void loadTemplateModel() {
         }
     }
 
-    protected void processTemplate(Template template, File outputFile) throws TemplateException, IOException {
+    protected void processTemplate(Template template, File outputFile, String encoding) throws TemplateException, IOException {
         FreemarkerTemplate freemarkerTemplate = new FreemarkerTemplate(getFreemarkerConfig());
+        freemarkerConfig.setDefaultEncoding(encoding);
         freemarkerTemplate.writeTemplate(template, templateModel, outputFile);
     }
 

src/main/java/com/aventstack/extentreports/reporter/ExtentSparkReporter.java

@@ -146,7 +146,7 @@ private void flush(ReportEntity value) {
             createFreemarkerConfig(TEMPLATE_LOCATION, ENCODING);
             final String filePath = getFileNameAsExt(FILE_NAME, new String[]{".html", ".htm"});
             final Template template = getFreemarkerConfig().getTemplate(SPA_TEMPLATE_NAME);
-            processTemplate(template, new File(filePath));
+            processTemplate(template, new File(filePath), conf.getEncoding());
             return;
         } catch (IOException | TemplateException e) {
             disposable.dispose();

src/main/java/com/aventstack/extentreports/templating/FreemarkerTemplate.java

@@ -43,7 +43,7 @@ public String getSource(Template template, Map<String, Object> templateMap) thro
     public void writeTemplate(Template template, Map<String, Object> templateMap, File outputFile)
             throws TemplateException, IOException {
         String source = getSource(template, templateMap);
-        BufferedWriterWriter.getInstance().write(outputFile, source);
+        BufferedWriterWriter.getInstance().write(outputFile, source, freemarkerConfig.getDefaultEncoding());
     }
 
     private String processTemplate(Template template, Map<String, Object> templateMap)