update FileUtil

examcloud-commons/src/main/java/cn/com/qmth/examcloud/commons/util/FileUtil.java

@@ -1,10 +1,16 @@
 package cn.com.qmth.examcloud.commons.util;
 
+import okhttp3.Request;
+import okhttp3.Response;
+import okhttp3.ResponseBody;
 import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.BufferedOutputStream;
 import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
 import java.text.SimpleDateFormat;
 import java.util.Arrays;
 import java.util.Comparator;
@@ -129,4 +135,48 @@ public class FileUtil {
         return new SimpleDateFormat("yyMMddHHmmssSSS").format(new Date()) + xyz;
     }
 
+    public static void saveToFile(byte[] bytes, File targetFile) {
+        if (bytes == null || targetFile == null) {
+            return;
+        }
+
+        if (!targetFile.exists()) {
+            try {
+                targetFile.getParentFile().mkdirs();
+                targetFile.createNewFile();
+            } catch (IOException e) {
+                log.error(e.getMessage(), e);
+            }
+        }
+
+        try (FileOutputStream fos = new FileOutputStream(targetFile);
+             BufferedOutputStream bos = new BufferedOutputStream(fos);) {
+            bos.write(bytes);
+        } catch (IOException e) {
+            log.error(e.getMessage(), e);
+        }
+    }
+
+    public static void saveImageToFile(String imgUrl, String filePath) {
+        byte[] data = null;
+        Request request = new Request.Builder().url(imgUrl).get().build();
+
+        try (Response response = OKHttpUtil.getOkHttpClient().newCall(request).execute();) {
+            if (response.isSuccessful()) {
+                ResponseBody body = response.body();
+                if (body != null) {
+                    data = body.bytes();
+                }
+            }
+        } catch (Exception e) {
+            log.error(e.getMessage(), e);
+        }
+
+        if (data == null || data.length == 0) {
+            throw new RuntimeException("图片下载错误！" + imgUrl);
+        }
+
+        saveToFile(data, new File(filePath));
+    }
+
 }