修改中文乱码，测试接口

src/main/java/com/sunyard/inf/SydCryptionApi.java

@@ -3,6 +3,8 @@ package com.sunyard.inf;
 import com.sun.org.apache.xml.internal.security.exceptions.Base64DecodingException;
 import com.sunyard.RetWrap;
 
+import java.io.UnsupportedEncodingException;
+
 /**
  * 对称加解密相关接口
  */
@@ -300,7 +302,7 @@ interface SydSYMApi {
      * @param outFilePath 解密后的数据文件所在的路径
      * @return 解密是否成功。false为失败，true为成功
      */
-    boolean SM4DecryptFileDataCBC(int keyType, String key, int inType, int outType, String inFilePath, String outFilePath);
+    boolean SM4DecryptFileDataCBC(int keyType, String key, int inType, int outType, String inFilePath, String outFilePath) throws UnsupportedEncodingException;
 
     /**
      * 使用SM4算法进行解密，其中加密模式为CBC,

src/main/java/com/sunyard/util/FileUtil.java

@@ -65,9 +65,9 @@ public class FileUtil {
      * @param data 数据
      */
     public static void printDataToFile(String path, String data) {
-        OutputStreamWriter osw = null;
+        BufferedWriter osw = null;
         try {
-            osw = new OutputStreamWriter(new FileOutputStream(path));
+            osw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(path), "UTF-8"));
 
             osw.write(data);