ResultSet转java对象的通用解决方案

根据resultSet,以及给定对象的Class对象进行填充，Class需要遵循JavaBean规范。

        private Collection mergeObject(ResultSet rs, Class clazz) throws Exception {ResultSetMetaData rmd = (ResultSetMetaData) rs.getMetaData();Collection coll = new ArrayList();;while (rs.next()) {Object obj = clazz.newInstance();for (int i = 1; i <= rmd.getColumnCount(); i++) {beanRegister(obj, rmd.getColumnName(i), rs.getString(i));//根据列名和对应值对对象属性进行赋值}coll.add(obj);}return coll;}

根据get方法的返回值类型，判断当前属性的类型，调用method.invoke(Object,param);

private void beanRegister(Object object, String beanProperty, String value) {Object[] beanObject = beanMatch(object.getClass(), beanProperty);Object[] cache = new Object[1];Method getter = (Method) beanObject[0];Method setter = (Method) beanObject[1];try {// 通过get获得方法类型String methodType = getter.getReturnType().getName();if ((methodType.equalsIgnoreCase("long") || methodType.equalsIgnoreCase("java.lang.Long"))&& !"".equals(value) && value != null) {cache[0] = new Long(value);setter.invoke(object, cache);} else if ((methodType.equalsIgnoreCase("int") || methodType.equalsIgnoreCase("java.lang.Integer"))&& !"".equals(value) && value != null) {cache[0] = new Integer(value);setter.invoke(object, cache);} else if ((methodType.equalsIgnoreCase("short") || methodType.equalsIgnoreCase("java.lang.Short"))&& !"".equals(value) && value != null) {cache[0] = new Short(value);setter.invoke(object, cache);} else if ((methodType.equalsIgnoreCase("float") || methodType.equalsIgnoreCase("java.lang.Float"))&& !"".equals(value) && value != null) {cache[0] = new Float(value);setter.invoke(object, cache);} else if ((methodType.equalsIgnoreCase("double") || methodType.equalsIgnoreCase("java.lang.Double"))&& !"".equals(value) && value != null) {cache[0] = new Double(value);setter.invoke(object, cache);} else if ((methodType.equalsIgnoreCase("boolean") || methodType.equalsIgnoreCase("java.lang.Boolean"))&& !"".equals(value) && value != null) {cache[0] = new Boolean(value);setter.invoke(object, cache);} else if ((methodType.equalsIgnoreCase("java.lang.String")) && !"".equals(value) && value != null) {cache[0] = value;setter.invoke(object, cache);} else if (methodType.equalsIgnoreCase("java.io.InputStream")) {} else if (methodType.equalsIgnoreCase("char")) {cache[0] = (Character.valueOf(value.charAt(0)));setter.invoke(object, cache);}} catch (Exception e) {e.printStackTrace();}}

private Object[] beanMatch(Class clazz, String beanProperty) {Object[] result = new Object[2];char beanPropertyChars[] = beanProperty.toCharArray();beanPropertyChars[0] = Character.toUpperCase(beanPropertyChars[0]);String s = new String(beanPropertyChars);String names[] = { ("set" + s).intern(), ("get" + s).intern(), ("is" + s).intern(), ("write" + s).intern(),("read" + s).intern() };Method getter = null;Method setter = null;Method methods[] = clazz.getMethods();for (int i = 0; i < methods.length; i++) {Method method = methods[i];if (!Modifier.isPublic(method.getModifiers()))continue;String methodName = method.getName().intern();for (int j = 0; j < names.length; j++) {String name = names[j];if (!name.equals(methodName))continue;if (methodName.startsWith("set") || methodName.startsWith("read"))setter = method;elsegetter = method;}}result[0] = getter;result[1] = setter;return result;}