How to solve the Chinese garbled code of AJAX POST data

var param = encodeURI(param);
$.ajax({
        url: 'url',
        methodtype: "POST",
        async: false,
        timeout: 60000,
        contentType: "application/json",
        data: {'param':param},
        success: function(data) {

        },
        error: function(data) {

        }
    });

import java.io.UnsupportedEncodingException;import java.net.URLDecoder;import java.net.URLEncoder;import org.apache.commons.codec.DecoderException;import org.apache.commons.codec.binary.Base64;import org.apache.commons.codec.binary.Hex;import org.apache.commons.lang3.StringEscapeUtils;/**
 * 封装各种格式的编码解码工具类.
 * 1.Commons-Codec的 hex/base64 编码
 * 2.自制的base62 编码
 * 3.Commons-Lang的xml/html escape
 * 4.JDK提供的URLEncoder
 * 
 */public class Encodes {

    private static final String DEFAULT_URL_ENCODING = "UTF-8";    private static final char[] BASE62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();    /**
     * Hex编码.
     */
    public static String encodeHex(byte[] input) {        return new String(Hex.encodeHex(input));
    }    /**
     * Hex解码.
     */
    public static byte[] decodeHex(String input) {        try {            return Hex.decodeHex(input.toCharArray());
        } catch (DecoderException e) {            throw Exceptions.unchecked(e);
        }
    }    /**
     * Base64编码.
     */
    public static String encodeBase64(byte[] input) {        return new String(Base64.encodeBase64(input));
    }    /**
     * Base64编码.
     */
    public static String encodeBase64(String input) {        try {            return new String(Base64.encodeBase64(input.getBytes(DEFAULT_URL_ENCODING)));
        } catch (UnsupportedEncodingException e) {            return "";
        }
    }//  /**//   * Base64编码, URL安全(将Base64中的URL非法字符'+'和'/'转为'-'和'_', 见RFC3548).//   *///  public static String encodeUrlSafeBase64(byte[] input) {//      return Base64.encodeBase64URLSafe(input);//  }

    /**
     * Base64解码.
     */
    public static byte[] decodeBase64(String input) {        return Base64.decodeBase64(input.getBytes());
    }    /**
     * Base64解码.
     */
    public static String decodeBase64String(String input) {        try {            return new String(Base64.decodeBase64(input.getBytes()), DEFAULT_URL_ENCODING);
        } catch (UnsupportedEncodingException e) {            return "";
        }
    }    /**
     * Base62编码。
     */
    public static String encodeBase62(byte[] input) {        char[] chars = new char[input.length];        for (int i = 0; i < input.length; i++) {
            chars[i] = BASE62[((input[i] & 0xFF) % BASE62.length)];
        }        return new String(chars);
    }    /**
     * Html 转码.  例如将 < 转成 &lt
     */
    public static String escapeHtml(String html) {        return StringEscapeUtils.escapeHtml4(html);
    }    /**
     * Html 解码.
     */
    public static String unescapeHtml(String htmlEscaped) {        return StringEscapeUtils.unescapeHtml4(htmlEscaped);
    }    /**
     * Xml 转码.
     */
    public static String escapeXml(String xml) {        return StringEscapeUtils.escapeXml10(xml);
    }    /**
     * Xml 解码.
     */
    public static String unescapeXml(String xmlEscaped) {        return StringEscapeUtils.unescapeXml(xmlEscaped);
    }    /**
     * URL 编码, Encode默认为UTF-8. 
     */
    public static String urlEncode(String part) {        try {            return URLEncoder.encode(part, DEFAULT_URL_ENCODING);
        } catch (UnsupportedEncodingException e) {            throw Exceptions.unchecked(e);
        }
    }    /**
     * URL 解码, Encode默认为UTF-8. 
     */
    public static String urlDecode(String part) {        try {            return URLDecoder.decode(part, DEFAULT_URL_ENCODING);
        } catch (UnsupportedEncodingException e) {            throw Exceptions.unchecked(e);
        }
    }
}