U only run chcp command on windows

Author: fvarrui

src/main/java/io/github/fvarrui/javapackager/utils/CharSetUtil.java

@@ -0,0 +1,42 @@
+package io.github.fvarrui.javapackager.utils;
+
+import static io.github.fvarrui.javapackager.utils.CommandUtils.execute;
+
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.apache.commons.lang3.SystemUtils;
+
+public class CharsetUtil {
+
+    public static Charset getCommandLineCharset(){
+    	if (SystemUtils.IS_OS_WINDOWS) {
+	        try{
+	            String result = execute("cmd", "/k", "chcp");
+	            String code = find("\\d+", result);
+	            switch (code){
+	                case "037": return Charset.forName("IBM037");
+	                case "936": return Charset.forName("gb2312");
+	                case "950": return Charset.forName("big5");
+	                case "1145": return Charset.forName("IBM01145");
+	                case "1200": return StandardCharsets.UTF_16;
+	                case "51936": return Charset.forName("EUC-CN");
+	                case "65001": return StandardCharsets.UTF_8;
+	            }
+	        } catch (Exception e){
+	        	// do nothing
+	        }
+    	}
+        return Charset.defaultCharset();
+    }
+
+    private static String find(String pattern,String data){
+        Pattern r = Pattern.compile(pattern);
+        Matcher matcher = r.matcher(data);
+        matcher.find();
+        return matcher.group();
+    }
+
+}