Java对json是否合法进行格式校验详解编程语言

private boolean value() { return literal("true") || literal("false") || literal("null") || string() || number() || object() || array(); private boolean literal(String text) { CharacterIterator ci = new StringCharacterIterator(text); char t = ci.first(); if (c != t) return false; int start = col; boolean ret = true; for (t = ci.next(); t != CharacterIterator.DONE; t = ci.next()) { if (t != nextCharacter()) { ret = false; break; nextCharacter(); if (!ret) error("literal " + text, start); return ret; private boolean array() { return aggregate([, ], false); private boolean object() { return aggregate({, }, true); private boolean aggregate(char entryCharacter, char exitCharacter, boolean prefix) { if (c != entryCharacter) return false; nextCharacter(); skipWhiteSpace(); if (c == exitCharacter) { nextCharacter(); return true; for (;;) { if (prefix) { int start = col; if (!string()) return error("string", start); skipWhiteSpace(); if (c != :) return error("colon", col); nextCharacter(); skipWhiteSpace(); if (value()) { skipWhiteSpace(); if (c == ,) { nextCharacter(); } else if (c == exitCharacter) { break; } else { return error("comma or " + exitCharacter, col); } else { return error("value", col); skipWhiteSpace(); nextCharacter(); return true; private boolean number() { if (!Character.isDigit(c) c != -) return false; int start = col; if (c == -) nextCharacter(); if (c == 0) { nextCharacter(); } else if (Character.isDigit(c)) { while (Character.isDigit(c)) nextCharacter(); } else { return error("number", start); if (c == .) { nextCharacter(); if (Character.isDigit(c)) { while (Character.isDigit(c)) nextCharacter(); } else { return error("number", start); if (c == e || c == E) { nextCharacter(); if (c == + || c == -) { nextCharacter(); if (Character.isDigit(c)) { while (Character.isDigit(c)) nextCharacter(); } else { return error("number", start); return true; private boolean string() { if (c != ") return false; int start = col; boolean escaped = false; for (nextCharacter(); c != CharacterIterator.DONE; nextCharacter()) { if (!escaped c == //) { escaped = true; } else if (escaped) { if (!escape()) { return false; escaped = false; } else if (c == ") { nextCharacter(); return true; return error("quoted string", start); private boolean escape() { int start = col - 1; if (" ///"/bfnrtu".indexOf(c) 0) { return error("escape sequence ///",////,///,//b,//f,//n,//r,//t or //uxxxx ", start); if (c == u) { if (!ishex(nextCharacter()) || !ishex(nextCharacter()) || !ishex(nextCharacter()) || !ishex(nextCharacter())) { return error("unicode escape sequence //uxxxx ", start); return true; private boolean ishex(char d) { return "0123456789abcdefABCDEF".indexOf(c) private char nextCharacter() { c = it.next(); ++col; return c; private void skipWhiteSpace() { while (Character.isWhitespace(c)) { nextCharacter(); private boolean error(String type, int col) { System.out.printf("type: %s, col: %s%s", type, col, System.getProperty("line.separator")); return false; public static void main(String[] args){ String jsonStr = "{/"website/":/"open-open.com/"}"; System.out.println(jsonStr+":"+new JsonValidator().validate(jsonStr)); }

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