fix error when input ico

build.gradle

@@ -56,6 +56,7 @@ ext {
     jgitVersion = '5.3.0.201903130848-r'
     flexmarkVersion = '0.42.12'
     thumbnailatorVersion = '0.4.8'
+    image4jVersion = '0.7zensight1'
 }
 
 dependencies {
@@ -96,7 +97,8 @@ dependencies {
     implementation "com.vladsch.flexmark:flexmark-html-parser:$flexmarkVersion"
 
     implementation "net.coobird:thumbnailator:$thumbnailatorVersion"
-
+    implementation "net.sf.image4j:image4j:$image4jVersion"
+    
     runtimeOnly 'com.h2database:h2'
     runtimeOnly 'mysql:mysql-connector-java'
 
@@ -106,4 +108,4 @@ dependencies {
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
 
     developmentOnly 'org.springframework.boot:spring-boot-devtools'
-}
+}

src/main/java/run/halo/app/handler/file/LocalFileHandler.java

@@ -17,13 +17,16 @@ import run.halo.app.utils.HaloUtils;
 
 import javax.imageio.ImageIO;
 import java.awt.image.BufferedImage;
+import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Calendar;
+import java.util.List;
 import java.util.Objects;
 import java.util.concurrent.locks.ReentrantLock;
+import net.sf.image4j.codec.ico.ICODecoder;
 
 import static run.halo.app.model.support.HaloConst.FILE_SEPARATOR;
 
@@ -151,7 +154,7 @@ public class LocalFileHandler implements FileHandler {
                     Path thumbnailPath = Paths.get(workDir + thumbnailSubFilePath);
 
                     // Read as image
-                    BufferedImage originalImage = ImageIO.read(uploadPath.toFile());
+                    BufferedImage originalImage = getImageFromFile(uploadPath.toFile(), extension);
                     // Set width and height
                     uploadResult.setWidth(originalImage.getWidth());
                     uploadResult.setHeight(originalImage.getHeight());
@@ -239,4 +242,14 @@ public class LocalFileHandler implements FileHandler {
         return result;
     }
 
+    private BufferedImage getImageFromFile(File file, String extension) throws IOException {
+        log.debug("Current File type is : [{}]", extension);
+
+        if ("ico".equals(extension)) {
+            return ICODecoder.read(file).get(0);
+        } else {
+            return ImageIO.read(file);
+        }
+    }
+
 }