Java 複雜 XML轉Object 物件例項（一）
阿新 • • 發佈：2018-12-11
Java 複雜 XML轉Object 物件例項：
在實際工作當中與第三方介面互動報文很多情況下都是XML格式，會用一些開源的解析XML對映Object物件工具類.很多時候網上找的開源框架工具類可能存在一些不相容現有系統.因此通過dom4j單個解析xml工作繁瑣、程式碼冗餘。
下面給大家介紹下自己研發複雜XML轉Object物件，通過Java基礎反射機制、dom4j、開發完成.，在工作中已經大範圍使用。非常簡單使用，無需大量引用第三方jar。有測試類示例，有工具類。使用說明：
- 引用開源jar包dom4j
- XMLObjectUtils.xmlToObj（類.class, strXML）
- XMLObjectUtils.xmlToObj（類路徑, strXML）
直接看如下示例：
package testxml; import xml.XMLObjectUtils; public class Text02 { public static void main(String[] args) { String str = " ".trim(); if(!"".equals(str)) { System.out.println("字串不為空"); } test01(); } private static void test01() { // 呼叫核心XML轉Object 方法 PackageXml pack = (PackageXml) XMLObjectUtils.xmlToObj(PackageXml.class, getStrXml()); System.out.println("Head- requestId :" + pack.getHead().getRequestId()); System.out.println("Head- requestTime :" + pack.getHead().getRequestTime()); for(Person per : pack.getBody().getPersons().getPerson()) { System.out.println("person - name:" + per.getNameXml()); } for(Person per : pack.getPersons().getPerson()) { System.out.println("person - name:" + per.getNameXml()); } } public static String getStrXml() { String strXml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + "<PackageXml>" + " <head>" + " <requestId>201809181010591537236659245908</requestId>" + " <requestTime>2018-12-12 12:12:12</requestTime>" + " </head>" + " <body>" + " <persons>" + " <person>" + " <nameXml>蔣幹</nameXml>" + " </person>" + " <person>" + " <nameXml>蔣幹</nameXml>" + " </person>" + " </persons>" + " </body>" + " <persons>" + " <person>" + " <nameXml>蔣幹</nameXml>" + " </person>" + " <person>" + " <nameXml>蔣幹</nameXml>" + " </person>" + " </persons>" + "</PackageXml>"; return strXml; } public String strFilter(String str){ String strFile = null; if(str != null && !"".equals(str)){ strFile = str.substring(0, str.indexOf("<?")); str = str.replace(strFile, ""); } return str; } }
工具類：XMLObjectUtils.java
package xml; import java.io.UnsupportedEncodingException; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.lang.reflect.ParameterizedType; import java.lang.reflect.Type; import java.util.ArrayList; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Set; import java.util.SortedMap; import java.util.TreeMap; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; /** * XML轉Object V1.0 支援List、Set、Object型別<br> * XML定義節點名稱與Object屬性名稱要保持一致，不區分大小寫。 * <br> * @User： AndyLee * @Time：2018年9月18日下午8:48:49 * */ public class XMLObjectUtils { /** * 方法名稱: xmlMappedObj<br> * 描述：xml 自動對映成對物件Object ： * 屬性支援： * 基本型別、String、Set、List、Object 等 * 作者: AndyLee * 修改日期：2018年9月18日下午8:48:49 * @param className 類名全路徑 * @param xmlStr * @return */ @SuppressWarnings("rawtypes") public static <T> Object xmlToObj(String className ,String strXml){ Object obj = null; try { obj = getObject(className); Class clzz = getInstance(className); Element element = getElement(strXml); xmlToObj(className, element, obj, clzz); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return obj ; } /** * 方法名稱: xmlMappedObj<br> * 描述：xml 自動對映成對物件Object ： * 屬性支援： * 基本型別、String、Set、List、Object 等 * 作者: AndyLee * 修改日期：2018年9月18日下午8:48:49 * @param clz 類名.class * @param strXml * @return */ @SuppressWarnings("rawtypes") public static <T> Object xmlToObj(Class clz ,String strXml){ Object obj = null ; try { String className = clz.getName(); obj = getObject(className); Class clzz = getInstance(className); Element element = getElement(strXml); xmlToObj(className, element, obj, clzz); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } return obj ; } public static <T> Object toXML1(String className ,String respXML){ Object obj = getObject(className); Class clzz = getInstance(className); Element element = getElement(respXML); for (Field field : getInstance(className).getDeclaredFields()) { Iterator iterator = element.elementIterator(); while(iterator.hasNext()){ Element el = (Element) iterator.next(); if(field.getName().equals(el.getName())){ field = getField(clzz, el.getName()); field.setAccessible(true); try { field.set(obj, el.getText()); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } return obj ; } public static Element getElement(String xml){ Element element = null ; Document doc = null ; try { doc = DocumentHelper.parseText(xml); element = doc.getRootElement() ; } catch (DocumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } return element ; } /*public static String objToJosn(Object obj){ if(obj != null){ return JSONObject.fromObject(obj).toString(); } return "" ; }*/ /** * Object - 》 XML 屬性只支援String類轉換 <br> * @param obj 物件 * @return <br> */ @SuppressWarnings("rawtypes") public static String froXML(Object obj){ SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>(); Class clzz = obj.getClass(); for (Field f : clzz.getDeclaredFields()){ if(f.getGenericType().toString().equals("class java.lang.String")){ Method m = getMethod(clzz, "get" + getMethodName(f.getName())); String value = getValue(m, obj); if(value != null){ packageParams.put(f.getName(), value); } } } return objToXML(packageParams) ; } @SuppressWarnings("rawtypes") public static String getSign(Object obj){ SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>(); Class clzz = obj.getClass(); for (Field f : clzz.getDeclaredFields()){ if(f.getGenericType().toString().equals("class java.lang.String")){ Method m = getMethod(clzz, "get" + getMethodName(f.getName())); String value = getValue(m, obj); if(value != null){ packageParams.put(f.getName(), value); } } } return objToXML(packageParams) ; } private static String getValue(Method method ,Object obj){ String value = null ; try { value = (String) method.invoke(obj); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InvocationTargetException e) { // TODO Auto-generated catch block e.printStackTrace(); } return value ; } @SuppressWarnings({ "unchecked", "rawtypes" }) private static Method getMethod(Class clzz ,String name){ Method method = null ; try { method = clzz.getMethod(name); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (NoSuchMethodException e) { // TODO Auto-generated catch block e.printStackTrace(); } return method ; } private static String getMethodName(String fildeName){ byte[] items = fildeName.getBytes(); items[0] = (byte) ((char) items[0] - 'a' + 'A'); return new String(items); } @SuppressWarnings("rawtypes") private static Field getField(Class clzz ,String labelName){ Field field = null ; try { field = clzz.getDeclaredField(labelName); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (NoSuchFieldException e) { // TODO Auto-generated catch block e.printStackTrace(); } return field ; } /*private static JSONObject getJson(String json){ JSONObject jsonObject = null ; try { jsonObject = JSONObject.fromObject(json) ; } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } return jsonObject ; }*/ private static Object getObject(String className){ Object obj = null ; try { obj = Class.forName(className).newInstance(); } catch (InstantiationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return obj ; } private static void analysisAttribute(Class clzz, Element element, Object obj, Class zl){ for(Field fd : getFields(zl)){ analysisValue(getIterator(element), element, fd, obj, clzz); } } private static void analysisValue(Iterator iterator, Element element, Field field, Object obj, Class clzz){ while(iterator.hasNext()){ Element ele = getElement(iterator); String key = ele.getName(); Object value = ele.getText(); if(checkAttribute(field, key)){ checkAttributeType(field, obj, clzz, key, value, ele); } /*if(checkAttribute(field, key) && checkIsEmpty(value)){ checkAttributeType(field, obj, clzz, key, value, ele); }*/ } } // private static void analysisValues(Iterator iterator, JSONObject json, Field field, Object obj, Class clzz){ // while(iterator.hasNext()){ // String key = getJSONArray(iterator); // Object value = getValue(key, json); // if(checkAttribute(field, key)){ // checkAttributeType(field, obj, clzz, key, value); // } // } // } private static void checkAttributeType(Field field, Object obj, Class clzz, String key, Object value, Element element){ if(checkAttribute(field, key)){ if(checkListType(field)){ setTypeValue(field, obj, clzz, key, setListType(field, obj, element)); }else if(checkSetType(field)){ setTypeValue(field, obj, clzz, key, setSetType(field, obj, element)); }else if(checkObject(field)){ setTypeValue(field, obj, clzz, key, setObjectType(field, element)); }else{ setTypeValue(field, obj, clzz, key, value); } } } private static List setListType(Field field, Object obj, Element element){ List list = new ArrayList(); Iterator it = element.elementIterator(); Class<?> clz = getClassInstantiation(getParameterizedType(getType(field))); Field [] fs = getFields(clz); while(it.hasNext()){ Object oj = getObject(clz.getName()); Element el = (Element) it.next(); for(Field fi : fs){ if(fi.getName().equals(el.getName())){ String key = el.getName(); String value = el.getText(); setTypeValue(fi, oj, clz, key, value);; } } list.add(oj); } return list ; } private static Set setSetType(Field field, Object obj, Element element){ Set set = new HashSet(); Class<?> clz = getClassInstantiation(getParameterizedType(getType(field))); Iterator it = element.elementIterator(); Field [] fs = getFields(clz); while(it.hasNext()){ Object oj = getObject(clz.getName()); Element el = (Element) it.next(); for(Field fi : fs){ if(fi.getName().equals(el.getName())){ String key = el.getName(); String value = el.getText(); setTypeValue(fi, oj, clz, key, value);; } } set.add(oj); } return set ; } private static <T> Object setObjectType(Field field, Element element){ Class clzz = field.getType() ; Object oj = getObject(clzz.getName()); analysisAttribute(clzz, element, oj, clzz); return oj ; } private static Object getValue(String key, Element element){ return element.getText(); } private static Element getElement(Iterator iterator){ Element book = (Element) iterator.next(); return book; } private static Element getElem(Iterator iterator){ Element book = (Element) iterator.next(); return book; } /*private static JSONObject getKeyJson(Iterator iterator){ return (JSONObject) iterator.next(); }*/ private static Iterator getIterator(Element element){ return element.elementIterator(); } private static void xmlToObj(String className, Element element, Object obj, Class clzz){ analysisAttribute(clzz, element, obj, getInstance(className)); } private static Field[] getFields(Class<?> clzz){ return clzz.getDeclaredFields(); } private static Class<?> getClassInstantiation(ParameterizedType paraType){ return (Class<?>)paraType.getActualTypeArguments()[0]; } private static ParameterizedType getParameterizedType(Type type){ return (ParameterizedType) type; } private static Type getType(Field field){ return field.getGenericType(); } /*private static JSONArray getJSONArray(String json){ return JSONArray.fromObject(json); }*/ public static void setAccessibleFlag(Field field){ field.setAccessible(true); } private static void setTypeValue(Field field, Object obj, Class clzz, String key, Object value){ if(checkAttribute(field, key)){ try { checkType(getDeclaredField(clzz, field.getName()), obj, value); } catch (NumberFormatException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } private static boolean checkAttribute(Field field, String attribute){ boolean flag = false ; if(field.getName().toUpperCase().equals(attribute.toUpperCase())){ flag = true ; } return flag ; } private static Field getDeclaredField(Class clz, String key){ return getField(clz, key); } private static void checkType(Field field, Object obj, Object value) throws NumberFormatException, IllegalArgumentException, IllegalAccessException{ setAccessibleFlag(field); if(checkInt(field)){ field.setInt(obj, Integer.parseInt(value.toString())); }else if(checkFloat(field)){ field.setFloat(obj, Float.parseFloat(value.toString())); }else if(checkDouble(field)){ field.setDouble(obj, Double.parseDouble(value.toString())); }else if(checkShort(field)){ field.setShort(obj, Short.parseShort(value.toString())); }else if(checkLong(field)){ field.setLong(obj, Long.parseLong(value.toString())); }else if(checkByte(field)){ field.setByte(obj, Byte.parseByte(value.toString())); }else if(checkBoolean(field)){ field.setBoolean(obj, Boolean.parseBoolean(value.toString())); }else{ field.set(obj, value); } } private static boolean checkInt(Field field){ boolean flag = false ; if(field.getType().equals(int.class)){ flag = true ; } return flag ; } private static boolean checkFloat(Field field){ boolean flag = false ; if(field.getType().equals(float.class)){ flag = true ; } return flag ; } private static boolean checkDouble(Field field){ boolean flag = false ; if(field.getType().equals(double.class)){ flag = true ; } return flag ; } private static boolean checkLong(Field field){ boolean flag = false ; if(field.getType().equals(long.class)){ flag = true ; } return flag ; } private static boolean checkChar(Field field){ boolean flag = false ; if(field.getType().equals(char.class)){ flag = true ; } return flag ; } private static boolean checkByte(Field field){ boolean flag = false ; if(field.getType().equals(byte.class)){ flag = true ; } return flag ; } private static boolean checkShort(Field field){ boolean flag = false ; if(field.getType().equals(short.class)){ flag = true ; } return flag ; } private static boolean checkBoolean(Field field){ boolean flag = false ; if(field.getType().equals(boolean.class)){ flag = true ; } return flag ; } private static boolean checkListType(Field field){ boolean flag = false ; if(field.getType().equals(java.util.List.class)){ flag = true ; } return flag ; } private static boolean checkSetType(Field field){ boolean flag = false ; if(field.getType().equals(java.util.Set.class)){ flag = true ; } return flag ; } private static boolean checkDateType(Field field){ boolean flag = false ; if(field.getType().equals(java.util.Date.class)){ flag = true ; } return flag ; } private static boolean checkStringType(Field field){ boolean flag = false ; if(field.getType().equals(String.class)){ flag = true ; } return flag ; } private static boolean checkIntegerType(Field field){ boolean flag = false ; if(field.getType().equals(java.lang.Integer.class)){ flag = true ; } return flag ; } private static boolean checkType(Field field){ boolean flag = false ; if(checkInt(field)){ flag = true ; }else if(checkFloat(field)){ flag = true ; }else if(checkDouble(field)){ flag = true ; }else if(checkLong(field)){ flag = true ; }else if(checkChar(field)){ flag = true ; }else if(checkByte(field)){ flag = true ; }else if(checkShort(field)){ flag = true ; }else if(checkBoolean(field)){ flag = true ; }else if(checkDateType(field)){ flag = true ; }else if(checkStringType(field)){ flag = true ; }else if(checkIntegerType(field)){ flag = true ; } return flag ; } public static boolean checkObject(Field field){ boolean flag = false ; if(!field.getType().toString().startsWith("java.") && !checkType(field)){ flag = true ; } return flag ; } /*@SuppressWarnings("rawtypes") private static void jsonListObj(String className, JSONObject jsonObject, Object obj, Class clzz){ for (Field field : getInstance(className).getDeclaredFields()) { Iterator iterator = jsonObject.keys() ; while(iterator.hasNext()){ String key = (String) iterator.next(); String value = jsonObject.getString(key); if(field.getName().toUpperCase().equals(key.toUpperCase())){ field = getField(clzz, key); field.setAccessible(true); try { field.set(obj, value); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } }*/ @SuppressWarnings("rawtypes") private static Class getInstance(String className){ Class clzz = null ; try { clzz = Class.forName(className).newInstance().getClass(); } catch (InstantiationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return clzz ; } private static boolean checkIsEmpty(Object obj){ boolean flag = false ; if(obj != null && !"null".equals(obj.toString()) && !"[]".equals(obj.toString())){ if (!"".equals(obj.toString().trim())) { flag = true ; } } return flag ; } @SuppressWarnings("rawtypes") private static String objToXML(SortedMap<Object,Object> parameters) { StringBuilder sb2 = new StringBuilder(); try { sb2.append("<?xml version='1.0' encoding='UTF-8' ?>"+"\n"+"<Content>"); sb2.append("\n"); Set es = parameters.entrySet(); Iterator it = es.iterator(); while(it.hasNext()) { Map.Entry entry = (Map.Entry)it.next(); String k = (String)entry.getKey(); Object v = entry.getValue(); sb2.append("<" + initialUpper(k) + ">"); if("messageType".equals(k)){ sb2.append(v.equals("text") ? "1" : "2"); }else{ sb2.append(v); } sb2.append("</" + initialUpper(k) + ">"); sb2.append("\n"); } sb2.append("</Content>"); } catch (Exception e) { e.printStackTrace(); } return sb2.toString() ; } /** * GBK轉UTF-8<br> * @param gbk * @return <br> */ public static String gbkToUtf8(String gbk){ String utf8 = null ; try { utf8 = new String(new String(gbk.getBytes("UTF-8"),"ISO-8859-1").getBytes("ISO-8859-1"),"UTF-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return utf8 ; } public static String initialUpper(String convertString){ return convertString.substring(0, 1).toUpperCase()+convertString.substring(1, convertString.length()); } public static String initialLower(String convertString){ return convertString.substring(0, 1).toLowerCase()+convertString.substring(1, convertString.length()); } }