将对象转换为json串的工具类.doc

import java.lang.reflect.Field;import java.lang.reflect.Method;import java.util.Date;import java.util.List;import java.util.Map;import java.util.Set;/* * 将对象转为json串的工具类 * */public class Obj2StrUtil SuppressWarnings(rawtypes)public static String obj2Str(Object obj)if(obj = null)return ;if(obj instanceof Map)return map2Str(obj);else if(obj instanceof List)return list2Str(obj);else if(obj.getClass().isArray()return array2Str(obj);Class clazz = obj.getClass();StringBuffer buffer = new StringBuffer();buffer.append();Method methods = clazz.getMethods();for(Method m : methods)if(m.getName().startsWith(set)String fieldName = m.getName().substring(3);char firstChar = fieldName.charAt(0);if(firstChar64 & firstChar 91)firstChar = (char) (firstChar + 32);StringBuffer sb = new StringBuffer(fieldName);sb.replace(0, 1, Character.toString(firstChar);fieldName = sb.toString();try Field field = clazz.getDeclaredField(fieldName);field.setAccessible(true);if(field.getType().isPrimitive() | field.getType() = Integer.class | field.getType() = Long.class | field.getType() = Float.class | field.getType() = Double.class)buffer.append(primative2Str(field,obj);else if(field.getType() = String.class)buffer.append().append(fieldName).append().append(:).append().append(field.get(obj).append();else if(field.getType() = Date.class)buffer.append().append(fieldName).append().append(:).append().append(DateUtil.date2Str(Date)field.get(obj).append();else if(field.get(obj) != null)buffer.append().append(fieldName).append().append(:).append(obj2Str(field.get(obj);if(field.get(obj) != null)buffer.append(,); catch (Exception e) e.printStackTrace();removeLastComma(buffer);buffer.append();return buffer.toString();/* * map对象转换规则 * */SuppressWarnings( unchecked, rawtypes )private static String map2Str(Object obj)StringBuffer buffer = new StringBuffer();buffer.append();Map map = (Map)obj);SetMap.Entry set = map.entrySet();if(obj instanceof Map)for(Map.Entry e : set)Class clazz = e.getValue().getClass();if(e.getValue() instanceof Map)buffer.append().append(e.getKey().append().append(:).append(map2Str(e.getValue();else if(e.getValue() instanceof Date)buffer.append().append(e.getKey().append().append(:).append().append(DateUtil.date2Str(Date)e.getValue().append();else if(e.getValue().getClass().isArray()buffer.append().append(e.getKey().append().append(:).append(array2Str(e.getValue();else if(e.getValue() instanceof List)buffer.append().append(e.getKey().append().append(:).append(list2Str(e.getValue();else if(clazz.isPrimitive() | clazz = Integer.class | clazz = Long.class | clazz = Float.class | clazz = Double.class)buffer.append().append(e.getKey().append().append(:);buffer.append(e.getValue();else if(clazz = String.class)buffer.append().append(e.getKey().append().append(:).append().append(e.getValue().append();elsebuffer.append().append(e.getKey().append().append(:).append(obj2Str(e.getValue();buffer.append(,);removeLastComma(buffer);buffer.append();return buffer.toString();/* * 基本类型转换规则 * */SuppressWarnings( rawtypes, unused )private static String primative2Str(Field field ,Object obj) throws ExceptionClass type = field.getType();StringBuffer buffer = new StringBuffer();buffer.append().append(field.getName().append().append(:).append(field.get(obj).append(,);removeLastComma(buffer);return buffer.toString();/* * 去除字符串中最后一个逗号 * */private static StringBuffer removeLastComma(StringBuffer buffer)if(buffer.length() 0 & buffer.charAt(buffer.length() -1 ) = ,)buffer.deleteCharAt(buffer.length() - 1);return buffer;/* * 数组转换为字符串 * */SuppressWarnings(rawtypes)private static String array2Str(Object obj)StringBuffer buffer = new StringBuffer();buffer.append();Class clazz = obj.getClass().getComponentType();if(clazz.isPrimitive() | clazz = Integer.class | clazz = Long.class | clazz = Float.class | clazz = Double.class| clazz = String.class )buffer.append(primativeArray2Str(obj);elseObject objs = (Object) obj;for(Object o : objs)buffer.append(obj2Str(o);buffer = removeLastComma(buffer);buffer.append();return buffer.toString();/* * list转换为字符串 * */SuppressWarnings(rawtypes)private static String list2Str(Object obj)StringBuffer buffer = new StringBuffer();buffer.append();List list = (List) obj;for(Object o : list)Class clazz = o.getClass();if(clazz.isPrimitive() | clazz = Integer.class | clazz = Long.class | clazz = Float.class | clazz = Double.class)buffer.append(o);else if(clazz = String.class)buffer.append().append(o).append();elsebuffer.append(obj2Str(o);buffer.append(,);buffer = removeLastComma(buffer);buffer.append();return buffer.toString();/* * 基本类型数组转换为字符串 * */SuppressWarnings(rawtypes)private static String primativeArray2Str(Object obj)StringBuffer buffer = new StringBuffer();Class clazz = obj.getClass().getComponentType();if(clazz = int.class)int objs = (int) obj;for(Object o : objs)buffer.append(o).append(,);else if(clazz = long.class)long objs = (long) obj;for(Object o : objs)buffer.append(o).append(,);else if(clazz = Integer.class)Integer objs = (Integer) obj;for(Object o : objs)buffer.append(o).append(,);else if(clazz = Long.class)Long objs = (Long) obj;for(Object o : objs)buffer.append(o).append(,);else if(clazz = float.class)float objs = (float) obj;for(Object o : objs)buffer.append(o).append(,);else if(clazz = Float.class)Float objs = (Float) obj;for(Object o : objs)buffer.append(o).append(,);else if(clazz = double.class)double objs = (double) obj;for(Object o : objs)buffer.append(