javaspilt会遇到的异常java.util.regex.PatternSyntaxException: Syntax error in regexp pattern near index 1

java的split会遇到的异常：

java.util.regex.PatternSyntaxException: Syntax error in regexp pattern near index 1

Dangling meta character '？' near index 0

单个符号做劈开分隔时，一定要注意，下面是正确的做法，就是在劈开的符号加[]包起来，或者加转移字符。

public static Map<String, String> getUrlParmInfo(String url){

String urlInfArr[] = url.split("[?]");

if(urlInfArr != null && urlInfArr.length > 1){

Map<String, String> mp = new HashMap<String, String>();

String parmStrArr[] = urlInfArr[1].split("[&]");

if(parmStrArr != null && parmStrArr.length > 0){

for(int i = 0;i < parmStrArr.length;i++){

String tmpParmArr[] = parmStrArr[i].split("[=]");

mp.put(tmpParmArr[0], tmpParmArr[1]);

}

return mp;

}

}

return null;

}