Jason是一种数据传输时候的一种格式,类似XML。
package liferay; import java.beans.IntrospectionException; import java.beans.Introspector; import java.beans.PropertyDescriptor; import java.math.BigDecimal; import java.math.BigInteger; import java.util.List; import java.util.Map; import java.util.Set; import demo.Student; public class JsonUtils { /** * @param obj * Any Object * @return String */ public static String object2json(Object obj) { StringBuilder json = new StringBuilder(); if (obj == null) { json.append(""""); } else if (obj instanceof String || obj instanceof Integer || obj instanceof Float || obj instanceof Boolean || obj instanceof Short || obj instanceof Double || obj instanceof Long || obj instanceof BigDecimal || obj instanceof BigInteger || obj instanceof Byte) { if (obj.toString().length() > 0 && String.valueOf(obj.toString().charAt(0)).equals("[")) { json.append(string2json(obj.toString())); } else json.append(""").append(string2json(obj.toString())) .append("""); } else if (obj instanceof Object[]) { json.append(array2json((Object[]) obj)); } else if (obj instanceof List) { json.append(list2json((List<?>) obj)); } else if (obj instanceof Map) { json.append(map2json((Map<?, ?>) obj)); } else if (obj instanceof Set) { json.append(set2json((Set<?>) obj)); } else { json.append(bean2json(obj)); } return json.toString(); } /** * @param bean * bean Object * @return String */ public static String bean2json(Object bean) { StringBuilder json = new StringBuilder(); json.append("{"); PropertyDescriptor[] props = null; try { props = Introspector.getBeanInfo(bean.getClass(), Object.class) .getPropertyDescriptors(); } catch (IntrospectionException e) { e.printStackTrace(); } if (props != null) { for (int i = 0; i < props.length; i++) { try { String name = object2json(props[i].getName()); String value = object2json(props[i].getReadMethod().invoke( bean)); json.append(name); json.append(":"); json.append(value); json.append(","); } catch (Exception e) { e.printStackTrace(); } } json.setCharAt(json.length() - 1, '}'); } else { json.append("}"); } return json.toString(); } /** * @param list * list Object * @return String */ public static String list2json(List<?> list) { StringBuilder json = new StringBuilder(); json.append("["); if (list != null && list.size() > 0) { for (Object obj : list) { json.append(object2json(obj)); json.append(","); } json.setCharAt(json.length() - 1, ']'); } else { json.append("]"); } return json.toString(); } /** * @param array * array object * @return String */ public static String array2json(Object[] array) { StringBuilder json = new StringBuilder(); json.append("["); if (array != null && array.length > 0) { for (Object obj : array) { json.append(object2json(obj)); json.append(","); } json.setCharAt(json.length() - 1, ']'); } else { json.append("]"); } return json.toString(); } /** * @param map * map object * @return String */ public static String map2json(Map<?, ?> map) { StringBuilder json = new StringBuilder(); json.append("{"); if (map != null && map.size() > 0) { for (Object key : map.keySet()) { json.append(object2json(key)); json.append(":"); json.append(object2json(map.get(key))); json.append(","); } json.setCharAt(json.length() - 1, '}'); } else { json.append("}"); } return json.toString(); } /** * @param set * set object * @return String */ public static String set2json(Set<?> set) { StringBuilder json = new StringBuilder(); json.append("["); if (set != null && set.size() > 0) { for (Object obj : set) { json.append(object2json(obj)); json.append(","); } json.setCharAt(json.length() - 1, ']'); } else { json.append("]"); } return json.toString(); } /** * @param s * arg * @return String */ public static String string2json(String s) { if (null == s) { return ""; } 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 '': sb.append("\b"); break; case 'f': sb.append("\f"); break; case ' ': sb.append("\n"); break; case ' ': sb.append("\r"); break; case ' ': sb.append("\t"); break; case '/': sb.append("/"); break; default: if (ch >= 'u0000' && ch <= 'u001F') { String ss = Integer.toHexString(ch); sb.append("\u"); for (int k = 0; k < 4 - ss.length(); k++) { sb.append('0'); } sb.append(ss.toUpperCase()); } else { sb.append(ch); } } } return sb.toString(); } public static void main(String[] args) { Student student = new Student(); student.setName("张三"); student.setScore(100); student.setSex("男"); student.setClzss("Java122班"); String jason = bean2json(student); System.out.println(jason); String str = "我\叫张三abxsdsd,dfsvgfd,as\das"; str = string2json(str); System.out.println(str); String ss = object2json(student); System.out.println("==========================="); System.out.println(ss); } }