URLEncoder 截取文件名称(汉字)转换

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;


public class urlUtil {

    public static String transform(String url) {
        StringBuilder sb = new StringBuilder();
        try {
            char[] chars = url.toCharArray();
            for (char c : chars) {
                if ('u2E80' < c && c < 'u9FFF') {
                    String encode = URLEncoder.encode(String.valueOf(c), "UTF-8");
                    sb.append(encode);
                } else {
                    sb.append(c);
                }
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return sb.toString();
    }
}