Web-url parameter Resolution

Requirements: To remove the URL, delete all parameters in the value content, only the path and key are preserved

Solution:

1. The path and Param are separated by the semicolon character (?) first

2. Then parse the Param, use & to Split, get each Itema

3. Finally, use = for Itema to split, retain key

4. Finally stitching path and key to get a unique string, a unique flag for a URL

Later, however, some unexpected results were found, such as the use of Jsonp, where any character exists in the argument. Form: a={"C": [{"D": "8&6"}]}&b=2, resulting in parsing failure

The last discovery can only solve this problem by literal character parsing.

Specific implementation:

1. URL decoding, if the decoding fails, the key character%7b, {,%7d},%20, and empty

2. Initialize iflag=0, key = ', val= ', strsplit= '/' #key之间分隔符, strkey = ' #记录所有key的结果

3. Get a character item, subscript I

4. If Iflag > 0:

if Iflag = = 1:value start position

Istartdakuohao = i

if Iflag = = 1 && item = = ': #跳过空格

Continue

if Iflag = = 1&& item = = ' {':

Iflag = 2

Icountdakuohao = 1

Istardakuohao = I//redefine the starting position of the Jsonp

Continue

if Icountdakuohao > 0:

if Item = = '} ':

Icountdakuohao--

if Icountdakuohao = = 0:

strtmp = Jsondata

List Jsondata

else If Item = = ' {':

Icountdakuohao + +

else If Item = = ' & ' #普通形式的value结尾

iflag = 0

Else

Val.add (item)

else if Key.len = = 0 && Item = = "Continue #过滤掉 start whitespace such as a=1& b=2

if Item = = ' = ' {Iflag =1; #表示已经获得key

If key! = ' _ ':

strkey = strkey + key + strsplit

key = "

}

else {

If Item = = ' & ': #过滤掉没有值得key such as A&b=1

key = "

Else:

Key.add (item) #key里面增加一个字符

}

Sample code:

private static string Getallkeylist (String str,string strsplit) throws Unsupportedencodingexception {string Strke y = ""; StringBuffer key = new StringBuffer (); StringBuffer val = new StringBuffer (); int iflag = 0; int Icountdakuohao = 0; int Istartdakuohao = 0; try {str = java.net.URLDecoder.decode (str, "utf-8"); }catch (Exception exp) {if (Str.indexof ("%7b") >-1) {str = str.replace ("%7b", "{");// } if (Str.indexof ("%7d") >-1) {str = str.replace ("%7d", "}"); } if (Str.indexof ("%20") >-1) {str = str.replace ("%20", "" "); }} for (int i = 0; i < str.length (); i++) {Char item = Str.charat (i); if (Iflag > 0) {//skip = with {spaces, compatibility is not JSONP keep value at the start of the if (Iflag = = 1) {//value start position Istartdakuohao = i; } if (Iflag = = 1 && Item = = ") {continue; } if (item = = ' {' && iflag = = 1) {Iflag = 2; Icountdakuohao = 1; Istartdakuohao = i; Jsonp start position redefine continue; } if (Icountdakuohao > 0) {if (item = = '} ') {icountdakuohao--; if (Icountdakuohao = = 0) {String strtmp = str.substring (Istartdakuohao, i+ 1); try{if (Strtmp.indexof ("%22") >-1) {strtmp = strtmp. Replace ("%22", "\" "); } if (Strtmp.indexof ("\\x5C") >-1) {strtmp = STRTMP.R Eplace ("\\x5C", "\ \"); } if (Strtmp.indexof("\\x22") >-1) {//cast \x22 strtmp = Strtmp.replace ("\\x22", "\" "); } Jsonobject obj = Jsonobject.fromobject (strtmp); Iterator Iterator = Obj.keys (); while (Iterator.hasnext ()) {String t = (string) iterator.next (); Strkey = strkey + t + strsplit; Get the value//System.out.println (Obj.get (t) in JSON); }//End while}catch (Exception exp) {System.out.println (exp.ge Tmessage ()); }//System.out.println (integer.tostring (Istartdakuohao) + "---" + strtmp + "---" + integer.t Ostring (i)); }}else if (item = = ' {') { icountdakuohao++; } continue; } if (item = = ' & ') {//Bfindkey = false; Iflag = 0; Obtained value//System.out.println (str.substring (Istartdakuohao, i)); }else val.append (item); }else {//filter out a=1& m=2 if (key.length () = = 0 && Item = = ") Continue if (item = = ' = ') {//Bfindkey = true; Iflag = 1; String strtmp = key.tostring (); if (!strtmp.equals ("_")) Strkey = strkey + strtmp + strsplit; Key.setlength (0); } else {if (item = = ' & ')//filter out keys with no value such as A&b=1 key.setlength (0); else Key.appenD (item); }} if (i = = Str.length ()-1) {//output last value//System.out.println (str. SUBSTRING (Istartdakuohao, i+1)); }} return strkey; System.out.println (strkey); } String str = "param= {\" a\ ":1}&d& m= 78&_=1234"; SYSTEM.OUT.PRINTLN (Getallkeylist (str, "/"));

A bug that can parse only one level of JSON and not multi-level JSON extraction

Web-url parameter Resolution