各种对象转成JSON字符串.doc

各种对象转成JSON字符串本文由java培训为你整理，需要用到的jar包 commons-beanutils-1.7.0.jar commons-collections-3.2.jar commons-lang-2.4.jar commons-logging-1.1.jar ezmorph-1.0.4.jar json-lib-2.2.2-jdk15.jar xom-1.0.jar 运行环境： jdk1.6.0_23 下面就是代码了 这个JSONUtil工具类可以把任何类型的对象转换成JSON字符串 Java代码 package com.json; 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 mons.logging.Log; import mons.logging.LogFactory; public class JSONUtil private static Log log = LogFactory.getLog(JSONUtil.class); 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) 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(); 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) if (props != null) for (int i = 0; i props.length; i+) try String name = object2json(propsi.getName(); String value = object2json(propsi.getReadMethod().invoke( bean); json.append(name); json.append(:); json.append(value); json.append(,); catch (Exception e) json.setCharAt(json.length() - 1, ); else json.append(); return json.toString(); 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(); 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(); 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(); 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(); public static String string2json(String s) if (s = null) return ; StringBuilder sb = new StringBuilder(); for (int i = 0; i = 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.toStr