//--------json工具类

package com.hisunsray.util;

import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class JsonUtils {
    public static String stringToJson(String s) {
        if (s == null) {
            return nullToJson();
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);
            switch (ch) {
            case '"':
                sb.append("///"");
                break;
            case '//':
                sb.append("////");
                break;
            case '/b':
                sb.append("//b");
                break;
            case '/f':
                sb.append("//f");
                break;
            case '/n':
                sb.append("//n");
                break;
            case '/r':
                sb.append("//r");
                break;
            case '/t':
                sb.append("//t");
                break;
            case '/':
                sb.append("///");
                break;
            default:
                if (ch >= '/u0000' && ch <= '/u001F') {
                    String ss = Integer.toHexString(ch);
              &nb