AJAX之POST数据中文乱码如何解决

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) {

 }
 });

后台java.net.URLDecoder进行解码
编解码工具

import java.io.UnsupportedEncodingException;import java.net.URLDecoder;import java.net.URLEncoder;import org.apache.commons.codec.DecoderException;import org.apache.commons.codec.binary.Base;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/base 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 = "01234567ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".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);
 }
 } /**
 * Base编码.
 */
 public static String encodeBase(byte[] input) { return new String(Base.encodeBase(input));
 } /**
 * Base编码.
 */
 public static String encodeBase(String input) { try { return new String(Base.encodeBase(input.getBytes(DEFAULT_URL_ENCODING)));
 } catch (UnsupportedEncodingException e) { return "";
 }
 }// /**// * Base编码, URL安全(将Base中的URL非法字符'+'和'/'转为'-'和'_', 见RFC3548).// */// public static String encodeUrlSafeBase(byte[] input) {// return Base.encodeBaseURLSafe(input);// }

 /**
 * Base解码.
 */
 public static byte[] decodeBase(String input) { return Base.decodeBase(input.getBytes());
 } /**
 * Base解码.
 */
 public static String decodeBaseString(String input) { try { return new String(Base.decodeBase(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 <
 */
 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);
 }
 }
}