深入浅出ExtJS第2版（随书光盘）之一

package com.family168.core; import java.beans.IntrospectionException; import java.beans.PropertyDescriptor; import java.io.Writer; import java.lang.reflect.Method; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; import net.sf.json.JSON; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import net.sf.json.JSONSerializer; import net.sf.json.JsonConfig; import net.sf.json.util.CycleDetectionStrategy; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * json工具类. * * @author Lingo * @since 2007-09-19 */ public class JsonUtils { /** * logger. */ private static Log logger = LogFactory.getLog(JsonUtils.class); /** * 工具类需要的保护构造方法. */ protected JsonUtils() { } /** * write. * * @param bean obj * @param writer 输出流 * @param excludes 不转换的属性数组 * @param datePattern date到string转换的模式 * @throws Exception 写入数据可能出现异常 */ public static void write(Object bean, Writer writer, String[] excludes, String datePattern) throws Exception { String pattern = (datePattern != null) ? datePattern : "yyyy-MM-dd"; JsonConfig jsonConfig = configJson(excludes, pattern); JSON json = JSONSerializer.toJSON(bean, jsonConfig); json.write(writer); } public static void write(Object bean, Writer writer, String excludes, String datePattern) throws Exception { if (excludes == null) { JsonUtils.write(bean, writer, new String[] {"hibernateLazyInitializer"}, datePattern); } else { JsonUtils.write(bean, writer, excludes.split(","), datePattern); } } public static void write(Object bean, Writer writer) throws Exception { JsonUtils.write(bean, writer, new String[] {"hibernateLazyInitializer"}, "yyyy-MM-dd"); } /** * 配置json-lib需要的excludes和datePattern. * * @param excludes 不需要转换的属性数组 * @param datePattern 日期转换模式 * @return JsonConfig 根据excludes和dataPattern生成的jsonConfig，用于write */ public static JsonConfig configJson(String[] excludes, String datePattern) { JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setExcludes(excludes); jsonConfig.setIgnoreDefaultExcludes(false); jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT); jsonConfig.registerJsonValueProcessor(Date.class, new DateJsonValueProcessor(datePattern)); return jsonConfig; } /** * data={"id":"1"}用json的数据创建指定的pojo. * * @param <T> Object * @param data json字符串 * @param clazz 需要转换成bean的具体类型 * @param excludes 不需要转换的属性数组 * @param datePattern 日期转换模式 * @return T * @throws Exception java.lang.InstantiationException, * java.beans.IntrospectionException, * java.lang.IllegalAccessException */ public static <T extends Object> T json2Bean(String data, Class<T> clazz, String[] excludes, String datePattern) throws Exception { // JsonUtils.configJson(excludes, datePattern); T entity = clazz.newInstance(); return json2Bean(data, entity, excludes, datePattern); } /** * data={"id":"1"}用json里的数据，填充指定的pojo. * * @param <T> Object * @param data json字符串 * @param entity 需要填充数据的bean * @param excludes 不需要转换的属性数组 * @param datePattern 日期转换模式 * @return T * @throws Exception java.lang.InstantiationException, * java.beans.IntrospectionException, * java.lang.IllegalAccessException */ public static <T extends Object> T json2Bean(String data, T entity, String[] excludes, String datePattern) throws Exception { // JsonUtils.configJson(excludes, datePattern); JSONObject jsonObject = JSONObject.fromObject(data); return json2Bean(jsonObject, entity, excludes, datePattern); } /** * 根据Class生成entity，再把JSONObject中的数据填充进去. * * @param <T> Object * @param jsonObject json对象 * @param clazz 需要转换成bean的具体类型 * @param excludes 不需要转换的属性数组 * @param datePattern 日期转换模式 * @return T * @throws Exception java.lang.InstantiationException, * java.beans.IntrospectionException, * java.lang.IllegalAccessException */ public static <T extends Object> T json2Bean(JSONObject jsonObject, Class<T> clazz, String[] excludes, String datePattern) throws Exception { // JsonUtils.configJson(excludes, datePattern); T entity = clazz.newInstance(); return json2Bean(jsonObject, entity, excludes, datePattern); } /** * 把JSONObject中的数据填充到entity中. * * @param <T> Object * @param jsonObject json对象 * @param entity 需要填充数据的node * @param excludes 不需要转换的属性数组 * @param datePattern 日期转换模式 * @return T * @throws Exception java.lang.InstantiationException, * java.beans.IntrospectionException, * java.lang.IllegalAccessException */ public static <T extends Object> T json2Bean(JSONObject jsonObject, T entity, String[] excludes, String datePattern) throws Exception { // JsonUtils.configJson(excludes, datePattern); Set<String> excludeSet = new HashSet<String>(); for (String exclude : excludes) { excludeSet.add(exclude); } for (Object object : jsonObject.entrySet()) { Map.Entry entry = (Map.Entry) object; String propertyName = entry.getKey().toString(); if (excludeSet.contains(propertyName)) { continue; } String propertyValue = entry.getValue().toString(); try { PropertyDescriptor propertyDescriptor = new PropertyDescriptor(propertyName, entity.getClass()); Class propertyType = propertyDescriptor.getPropertyType(); Method writeMethod = propertyDescriptor.getWriteMethod(); if (propertyType == String.class) { writeMethod.invoke(entity, propertyValue); } else if ((propertyType == Byte.class) || (propertyType == byte.class)) { writeMethod.invoke(entity, Byte.parseByte(propertyValue)); } else if ((propertyType == Short.class) || (propertyType == short.class)) { writeMethod.invoke(entity, Short.parseShort(propertyValue)); } else if ((propertyType == Integer.class) || (propertyType == int.class)) { writeMethod.invoke(entity, Integer.parseInt(propertyValue)); } else if ((propertyType == Long.class) || (propertyType == long.class)) { writeMethod.invoke(entity, Long.parseLong(propertyValue)); } else if ((propert