String ss="hello";byte[] buff=ss.getBytes();int f=buff.length;System.out.println(f);

字节长度。一个中文是3。其他是1

1、获取url中的参数

创建string

String urls= "/yuanxinbuluo/weixin/getJsp?url=wechatweb/business-style-five&param=330&appFlg=1";String param= URLRequest(urls).get("param");//是330

实现方法

/*** 解析出url参数中的键值对* 如 "index.jsp?Action=del&id=123"，解析出Action:del,id:123存入map中* @param URL url地址* @return url请求参数部分*/public static Map<String, String> URLRequest(String URL){Map<String, String> mapRequest = new HashMap<String, String>();String[] arrSplit=null;String strUrlParam=TruncateUrlPage(URL);if(strUrlParam==null){return mapRequest;}//每个键值为一组 arrSplit=strUrlParam.split("[&]");for(String strSplit:arrSplit){String[] arrSplitEqual=null;arrSplitEqual= strSplit.split("[=]");//解析出键值if(arrSplitEqual.length>1){//正确解析mapRequest.put(arrSplitEqual[0], arrSplitEqual[1]);}else{if(arrSplitEqual[0]!=""){//只有参数没有值，不加入mapRequest.put(arrSplitEqual[0], "");}}}return mapRequest;}/*** 去掉url中的路径，留下请求参数部分* @param strURL url地址* @return url请求参数部分*/private static String TruncateUrlPage(String strURL){String strAllParam=null;String[] arrSplit=null;strURL=strURL.trim();arrSplit=strURL.split("[?]");if(strURL.length()>1){if(arrSplit.length>1){if(arrSplit[1]!=null){strAllParam=arrSplit[1];}}}return strAllParam;}

2、验证邮箱格式，电话格式，密码格式

public static boolean isMobileNO(String mobiles) {

String telRegex = "13\\d{9}|14[57]\\d{8}|15[012356789]\\d{8}|18[012356789]\\d{8}|17[01678]\\d{8}";

if (TextUtils.isEmpty(mobiles)) return false;

else return mobiles.matches(telRegex);

}

public static boolean passWordVerify(String pass) {

Pattern p = pile("^[A-Za-z0-9]{6,12}$");

//Pattern p = pile("^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z_]{6,12}$");

return p.matcher(pass).matches();

}

public static boolean mailAddressVerify(String mailAddress) {

String emailExp = "^([a-zA-Z0-9_\\-\\.]+)@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$";

Pattern p = pile(emailExp);

return p.matcher(mailAddress).matches();

}

3、截取字符串中键值对的值

String data ="Address[addressLines=[0:\"广东省东莞市健升大厦\"],feature=健升大厦,admin=广东省,sub-admin=null,locality=东莞市,thoroughfare=null,postalCode=null,countryCode=CN,countryName=中国,hasLatitude=true, latitude=23.025354,hasLongitude=true,longitude=113.748738,phone=null,url=null,extras=Bundle[mParcelledData.dataSize=92]]";int startCity = data.indexOf("locality=") + "locality=".length();int endCity = data.indexOf(",", startCity);String city = data.substring(startCity, endCity);//获取市int startPlace = data.indexOf("feature=") + "feature=".length();int endplace = data.indexOf(",", startPlace);String place = data.substring(startPlace, endplace);//获取地址LgqLogutil.e(city+place);

04-24 14:53:27.140 20566-20566/com.tianxin.ttttest E/lgq: onCreate----东莞市健升大厦

4、去空格

s = s.replaceAll("\r|\n", "");

5、替换字符串

String abtest = "123abc";

String result ="";

result = abtest.replace("ab","hhhh");//是"123hhhhc"

6、根据游标截取字符串

String abtest = "123abc";

String result ="";

// result = abtest.substring(3);//="abc

result = abtest.substring(3,4);//="a

7、去空格，替换字符

String str = " hell ， 午饭，，晚饭 ";

String str2 = str.replaceAll(" ", "");

Pattern pattern = pile("\t|\r|\n|\\s*|\\�");Matcher matcher = pattern.matcher(src);dest = matcher.replaceAll("");

8、bundleToString

private static String bundleToString(Bundle bundle) {if (bundle == null) {return "null";}final StringBuilder sb = new StringBuilder();for (String key: bundle.keySet()) {sb.append(key).append("=>").append(bundle.get(key)).append("\n");}return sb.toString();}

android 获取url中的参数 验证邮箱格式 截取字符串中键值对的值 String的字节长度 去空格 替换字符