判断是否JSON格式，日期，整数和小数的工具类

做ESB接口开发和Excel上传校验的时候遇到校验的问题，特意整理了一些工具类。

JsonValidator判断是否为json格式的字符串，不用try-catch。

import java.text.CharacterIterator;import java.text.StringCharacterIterator;public class JsonValidator {    private CharacterIterator it;    private char              c;    private int               col;    public JsonValidator(){    }    /**     * 验证一个字符串是否是合法的JSON串     *      * @param input 要验证的字符串     * @return true-合法 ，false-非法     */    public boolean validate(String input) {        input = input.trim();        boolean ret = valid(input);        return ret;    }    private boolean valid(String input) {        if ("".equals(input)) return true;        boolean ret = true;        it = new StringCharacterIterator(input);        c = it.first();        col = 1;        if (!value()) {            ret = error("value", 1);        } else {            skipWhiteSpace();            if (c != CharacterIterator.DONE) {                ret = error("end", col);            }        }        return ret;    }    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) >= 0;    }    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\":\"oschina.net\"}";        String jsonStr = "{"            + " \"ccobjtypeid\": \"1001\","            + " \"fromuser\": \"李四\","            + " \"touser\": \"张三\","            + "  \"desc\": \"描述\","            + "  \"subject\": \"主题\","            + "  \"attach\": \"3245,3456,4345,4553\","            + " \"data\": {"            + "    \"desc\": \"测试对象\","            + "     \"dataid\": \"22\","            + "    \"billno\": \"TEST0001\","            + "    \"datarelation\":["            + " {"            + "  \"dataname\": \"关联对象1\","            + "  \"data\": ["            + "      {"            + "    \"dataid\": \"22\","            + "          \"datalineid\": \"1\","            + "          \"content1\": \"test1\","            + "          \"content2\": \"test2\""            + "      }"            + "  ]"            + " }"            + " ]"            + "  }"            + " }";        System.out.println(jsonStr+":"+new JsonValidator().validate(jsonStr));    }}

DateTimeValidator 校验时间格式

`public class DateTimeValidator {

public static boolean dateCheck(String checkValue){    checkValue = "2008-09-11 14:17:11";    DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd HH:mm:ss");    Date d = null;    if(checkValue != null && !checkValue.equals(""))    {        if(checkValue.split("/").length > 1)        { dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); }        if (checkValue.split("-").length > 1)        {dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  }    }else { return false; }    try    { d = dateFormat.parse(checkValue);}    catch(Exception e)    { return false;}    String eL= "^((\\d{2}(([02468][048])|([13579][26]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][1235679])|([13579][01345789]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))(\\s(((0?[0-9])|([1-2][0-9]))\:([0-5]?[0-9])((\\s)|(\:([0-5]?[0-9])))))?$";    Pattern p = Pattern.compile(eL);    Matcher m = p.matcher(checkValue);    boolean b = m.matches();    if(b) { return  true; }    else  { return false; }}

}`

NumberValidationUtils 校验整数小数的类型

public class NumberValidationUtils {

private static boolean isMatch(String regex, String orginal){    if (orginal == null || orginal.trim().equals("")) {        return false;    }    Pattern pattern = Pattern.compile(regex);    Matcher isNum = pattern.matcher(orginal);    return isNum.matches();}public static boolean isPositiveInteger(String orginal) {    return isMatch("^\\+{0,1}[1-9]\\d*", orginal);}public static boolean isNegativeInteger(String orginal) {    return isMatch("^-[1-9]\\d*", orginal);}public static boolean isWholeNumber(String orginal) {    return isMatch("[+-]{0,1}0", orginal) || isPositiveInteger(orginal) || isNegativeInteger(orginal);}public static boolean isPositiveDecimal(String orginal){    return isMatch("\\+{0,1}[0]\\.[1-9]*|\\+{0,1}[1-9]\\d*\\.\\d*", orginal);}public static boolean isNegativeDecimal(String orginal){    return isMatch("^-[0]\\.[1-9]*|^-[1-9]\\d*\\.\\d*", orginal);}public static boolean isDecimal(String orginal){    return isMatch("[-+]{0,1}\\d+\\.\\d*|[-+]{0,1}\\d*\\.\\d+", orginal);}public static boolean isRealNumber(String orginal){    return isWholeNumber(orginal) || isDecimal(orginal);}

}

因为try-catch捕捉异常耗性能，所以少用，尽量用别的校验方式。
搜罗而来，原处已忘。见谅