<easyui>格式数据的构造(Java拼接)(二)(children形式,支持两种树结构)

主调方法有两个

getTreeJsonStrNormal

getTreeJsonStr

分别是两种树的形式

以下是代码，里面有测试案例

/**    * * @version V1.0    */import java.beans.IntrospectionException;import java.beans.PropertyDescriptor;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.ArrayList;import java.util.HashMap;import java.util.HashSet;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Map.Entry;import java.util.Set;import net.sf.json.JSONArray;/** * 用途：json树的数据生成类  * 描述：将数据列表转换成相应的tree所必需的JSON格式  * 说明：N级节点树，默认树节点是关闭的，支持两种树的格式 * easyui json树的形式： * { * "id":"1", * "state":"open", * "text":"节点名字", * "children":[...] * } *  * @author wang'ao *  */public class JsonTreeHelper {/** * 测试的main方法 * @param args */public static void main(String[] args) {/*测试类型二*/TestClass t1 = new TestClass(0, "节点1",null) ;TestClass t2 = new TestClass(1, "节点11","0" ) ;TestClass t3 = new TestClass(2, "节点12","0" ) ;TestClass t4 = new TestClass(4, "节点21","3" ) ;TestClass t6 = new TestClass(5, "节点22","3" ) ;TestClass t5 = new TestClass(3, "节点2",null ) ;TestClass t7 = new TestClass(7, "节点3",null ) ;TestClass t8 = new TestClass(8, "节点31","7") ;TestClass t9 = new TestClass(9, "节点311","8" ) ;TestClass t10 = new TestClass(10, "节点3111","9" ) ;List<Object> list = new ArrayList<Object>() ;list.add(t1) ;list.add(t2) ;list.add(t3) ;list.add(t4) ;list.add(t5) ;list.add(t6) ;list.add(t7) ;list.add(t8) ;list.add(t9) ;list.add(t10) ;try {System.out.println(JSONArray.fromObject(getTreeJsonStrNormal(new String[]{"id","name","pro"},list)));} catch (IllegalArgumentException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (SecurityException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();} catch (NoSuchMethodException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();} catch (IntrospectionException e) {e.printStackTrace();}}/************************主调方法类型一******************************* *  * easyui 树数据的类型： * id1group1group2 ... * id2group1group2 ... * id3group1group2 ... * . * . * . * 构造结果: * group1(id1) * group2(id1) * ... * group1(id2) * group2(id2) * ... * group1(id3) * group2(id3) * ... * 用途:转换tree形式数据 用例: 实体类:class People{private String name ;private String hometown ;private String occupation ; set...;get...} *  * 调用方法:getTreeJsonStr(new String[]{"hometown","occupation"},data); * 说明:表示以hometown为根节点,occupation字段为子节点所构成的树 *  * @param 节点sNameBySeq *        树节点名字数组 {"根节点","子节点1","子节点2",...} ,此处的名字应是对应的实体类的成员名. *        如:有一个成员{private String type ;} 根节点是"type" * @param data *            数据 * @return tree形式的JSON数据 * @throws IllegalArgumentException * @throws IllegalAccessException */public static String getTreeJsonStr(String[] 节点sNameBySeq,List<Object> data) throws IllegalArgumentException,IllegalAccessException {int[] fieldIndex = new int[节点sNameBySeq.length];Field[] fields = data.get(0).getClass().getDeclaredFields();for (int i = 0; i < 节点sNameBySeq.length; i++) {for (int j = 0; j < fields.length; j++) {if (节点sNameBySeq[i].equals(fields[j].getName())) {fieldIndex[i] = j;}}}// 替换成text字段return replaceText(JSONArray.fromObject(recursiveTree(data, fieldIndex)).toString(),节点sNameBySeq[节点sNameBySeq.length - 1], "text");}/************************主调方法类型二******************************* * *easyui 树数据的类型： * id1text_parentId(id2) ... * id2text_parentId(id2) ... * id3text_parentId(null) ... * . * . * . * 构造结果: * text(id3) * text(id1) * text(id2) *  * @param strings 一般是三个数据 如：new String[]{"id","节点text","parentId"};这些数据要和实体类的成员字段一样 * 顺序不能变 * id:实体类的id * 节点text:实体类显示的节点文本 * parentId:实体类的父节点字段 *  * @return json字符串 * @throws IllegalAccessException  * @throws IllegalArgumentException  * @throws InvocationTargetException  * @throws NoSuchMethodException  * @throws ClassNotFoundException  * @throws SecurityException  * @throws IntrospectionException  */public static String getTreeJsonStrNormal(String[] members,List<Object> data) throws IllegalArgumentException, IllegalAccessException, SecurityException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IntrospectionException {//分组 Map<String, List<Object>> groupedMapRel = groupByGetMethod(data,members[PARENT_节点_INDEX]) ;//赋值转换 Map<String, List<JsonTreeObj>> groupedMapJsonTree = assignment(groupedMapRel,members) ;//递归Map<String,List<JsonTreeObj>> map = recursiveTree(groupedMapJsonTree) ;//还原数据currentKeyFlag = TREE_ROOT_NAME ;preKeyFlag = TREE_ROOT_NAME ;List<JsonTreeObj> jsonList = map.get(currentKeyFlag) ;//递归数据,组成json mapreturn JSONArray.fromObject(jsonList).toString().replace("\"children\":[],", "");}/** * 将数据根据根节点进行分组 *  * @param fieldIndex *            根节点成员字段所对应折field索引 * @param list *            数据列表 * @return 分组好的map数据 * @throws IllegalArgumentException * @throws IllegalAccessException */private static Map<String, List<Object>> groupBy节点Name(Integer fieldIndex, List<Object> list)throws IllegalArgumentException, IllegalAccessException {// 准备集合Map<String, List<Object>> readyMap = new HashMap<String, List<Object>>();for (int i = 0; i < list.size(); i++) {java.lang.reflect.Field[] field = (java.lang.reflect.Field[]) list.get(i).getClass().getDeclaredFields();field[fieldIndex].setAccessible(true);List<Object> find = readyMap.get(field[fieldIndex].get(list.get(i)).toString());if (readyMap.isEmpty() || find == null) {List<Object> similar = new ArrayList<Object>();similar.add(list.get(i));readyMap.put(field[fieldIndex].get(list.get(i)).toString(),similar);} else {find.add(list.get(i));readyMap.put(field[fieldIndex].get(list.get(i)).toString(),find);}}return readyMap;}private static int fIndex = 0;/** * 遍历所有节点(递归调用) *  * @param data * @param fieldIndexF * @return * @throws IllegalArgumentException * @throws IllegalAccessException */private static List<JsonTreeObj> recursiveTree(List<Object> data,int[] fieldIndexF) throws IllegalArgumentException,IllegalAccessException {// 先进行一次分组Map<String, List<Object>> firstGroupedData = groupBy节点Name(fieldIndexF[fIndex], data);List<JsonTreeObj> jsonTrees = new ArrayList<JsonTreeObj>();// 第一次分组的数据Iterator<Map.Entry<String, List<Object>>> it = firstGroupedData.entrySet().iterator();int i = 0;List<Object> list;// 遍历mapwhile (it.hasNext()) {Map.Entry<String, List<Object>> entry = it.next();jsonTrees.add(new JsonTreeObj(entry.getKey(), entry.getValue()));if (fieldIndexF.length > 1 && fIndex < fieldIndexF.length - 2) {fIndex++;// **.clear()方法要清除指针，所以要用new方法实例化list = new ArrayList<Object>(entry.getValue());jsonTrees.get(i).getChildren().clear();jsonTrees.get(i).getChildren().addAll((recursiveTree(list, fieldIndexF)));}i++;}fIndex--;return jsonTrees;}/** * 将JSON串中的字符替换，如："post" -> "text" ,这样可以正常显示文本，否则 undefine *  * @param src *            源JSON * @param replace *            要替换的字段 * @param changedTxt *            替换之后的字段 * @return 替换完成之后的字段 */private static String replaceText(String src, String replace,String changedTxt) {return src.replaceAll("\"" + replace + "\"", "\"" + changedTxt + "\"");}/**第0个元素默认是id主键**/private final static Integer PRIMARY_KEY_INDEX = 0 ;/**第1个元素默认是节点名字**/private final static Integer 节点_NAME_INDEX = 1 ;/**第2个元素,父节点字段的索引**/private final static Integer PARENT_节点_INDEX = 2 ;/**树节点的默认状态**/private final static String TREE_节点_DEFAULT_STATE = "open" ;/** * 此方法用于实际数据和构造的json tree 对象赋值转换 * @param groupedMap * @param members * @return * @throws SecurityException * @throws IllegalArgumentException * @throws ClassNotFoundException * @throws NoSuchMethodException * @throws IllegalAccessException * @throws InvocationTargetException * @throws IntrospectionException */private static Map<String, List<JsonTreeObj>> assignment(Map<String, List<Object>> groupedMap,String[] members) throws SecurityException, IllegalArgumentException, ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, IntrospectionException {Map<String, List<JsonTreeObj>> groupedMapJsonObj = new HashMap<String, List<JsonTreeObj>>();Iterator<Entry<String, List<Object>>> it = groupedMap.entrySet().iterator() ;while (it.hasNext()) {Entry<String, List<Object>> entry = it.next();//map->listList<Object> valueList = entry.getValue() ;//新表List<JsonTreeObj> newList = new ArrayList<JsonTreeHelper.JsonTreeObj>() ;for (Object object : valueList) {JsonTreeObj obj = new JsonTreeObj() ;//id赋值String id  = getResultByMemberName(object,members[PRIMARY_KEY_INDEX]).toString() ; obj.setId(id) ;//节点name赋值String text = getResultByMemberName(object,members[节点_NAME_INDEX]).toString() ; obj.setText(text) ;//if(entry.getKey().equals(TREE_ROOT_NAME))obj.setState(TREE_节点_DEFAULT_STATE) ;newList.add(obj) ;}groupedMapJsonObj.put(entry.getKey(), newList) ;}return groupedMapJsonObj ;}/**根节点的父为空,给它个map key,是这个常量**/private final static String TREE_ROOT_NAME = "root" ;/** * 用xxx类成员来分组 ,返回map数据 * @param dataList * @param memberName * @return * @throws SecurityException * @throws IllegalArgumentException * @throws ClassNotFoundException * @throws NoSuchMethodException * @throws IllegalAccessException * @throws InvocationTargetException * @throws IntrospectionException  */public static Map<String,List<Object>> groupByGetMethod(List<Object> dataList ,String memberName) throws SecurityException, IllegalArgumentException, ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, IntrospectionException {Map<String, List<Object>> groupedMap = new HashMap<String, List<Object>>();for (int i = 0; i < dataList.size(); i++) {Object value = getResultByMemberName(dataList.get(i), memberName) ; // 获得成员get方法值,分组依据String groupTagValue = (value == null || value.equals("") )? TREE_ROOT_NAME : value.toString();// 找数据List<Object> findList = groupedMap.get(groupTagValue);// 没找到就加数据,增加listif (groupedMap.isEmpty() || findList == null) {// 做为放在map中的listList<Object> tmpList = new ArrayList<Object>();tmpList.add(dataList.get(i));groupedMap.put(groupTagValue, tmpList);}// 找到数据就添加数据,增加mapelse {findList.add(dataList.get(i));// 覆盖map,新list替换旧listgroupedMap.put(groupTagValue, findList);}}return groupedMap;}/**保存遍历list->child时的key**/private static String currentKeyFlag = TREE_ROOT_NAME ;/**保存遍历list时的当前key**/private static String preKeyFlag = TREE_ROOT_NAME ;/** * 递归树 * @param groupedMap * @return * @throws SecurityException * @throws IllegalArgumentException * @throws ClassNotFoundException * @throws NoSuchMethodException * @throws IllegalAccessException * @throws InvocationTargetException */private static Map<String,List<JsonTreeObj>> recursiveTree(Map<String, List<JsonTreeObj>> groupedMap) throws SecurityException, IllegalArgumentException, ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {//复制mapMap<String,List<JsonTreeObj>> copyGroupedMap = new HashMap<String, List<JsonTreeObj>>(groupedMap) ;//拿到所有的key,key也是父节点idSet<String> keys = groupedMap.keySet() ;//复制一个keysSet<String> copyKeys = new HashSet<String>(keys) ;Iterator<Entry<String, List<JsonTreeObj>>> it = groupedMap.entrySet().iterator() ;while (it.hasNext() ) {Map.Entry<String, List<JsonTreeObj>> entry = it.next();String currentKey = entry.getKey() ;//获取根节点，最上的节点if(currentKey.equals(currentKeyFlag)) {List<JsonTreeObj> list = entry.getValue() ;//复制listList<JsonTreeObj> copytList = new ArrayList<JsonTreeObj>(list) ;for (int  i = 0 ; i < list.size() ; i ++ ) {//map->list中的每一个id已经拿到String id = list.get(i).getId() ;copyKeys.remove(currentKeyFlag) ;//默认不存在boolean flag = false ;for (Object key : keys) {// key和根节点id一样？if (key.equals(id)) {// 暂存，除去此次遍历的map值,要留下其它的Map<String, List<JsonTreeObj>> removeThisMap = new HashMap<String, List<JsonTreeObj>>(groupedMap);removeThisMap.remove(currentKeyFlag);// 进行递归 currentKeyFlag = id;preKeyFlag = currentKey ;Map<String, List<JsonTreeObj>> childMap = recursiveTree(removeThisMap);if (childMap != null) {Set<String> childSet = childMap.keySet();//去除包含子节点的map key值copyKeys.removeAll(childSet);//主map不要这个值，否则很乱//copyGroupedMap.clear() ;currentKeyFlag = preKeyFlag;//preKeyFlag = id;List<JsonTreeObj> childList = childMap.get(id);// 增加子节点List<Object> childrenList = new ArrayList<Object>(childList);//改变副本的值copytList.get(i).setChildren(childrenList);copyGroupedMap.put(currentKey, copytList) ;}flag = true ;//提前结束循环,一个list就挂一个mapbreak ;}}//没有子节点if(!flag) {List<JsonTreeObj> tmpList = new ArrayList<JsonTreeObj>(copyGroupedMap.get(currentKeyFlag) );tmpList.get(i).setChildren(null);//copyGroupedMap.clear() ;// TODO @wang'ao 当有一个根节点为空时有问题，不能显示所有根节点//Map<String, List<JsonTreeObj>> tmpMap = new HashMap<String, List<JsonTreeObj>>(copyGroupedMap) ;copyGroupedMap.remove(currentKey) ;copyGroupedMap.put(currentKey,tmpList) ;}//currentKey = preKeyFlag;preKeyFlag = currentKey ;currentKeyFlag = preKeyFlag;}//提前结束循环while copyKeysbreak ;}}return copyGroupedMap ;}/** * 通过成员名获得该方法的get方法的返回值 * @param thisClass * @param member * @return * @throws ClassNotFoundException * @throws SecurityException * @throws NoSuchMethodException * @throws IllegalArgumentException * @throws IllegalAccessException * @throws InvocationTargetException * @throws IntrospectionException  */public static Object getResultByMemberName(Object obj , String member) throws ClassNotFoundException, SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException, IntrospectionException {Class<? extends Object> clazz = obj.getClass();Field[] fields = obj.getClass().getDeclaredFields();// 获得属性Object o = "";for (Field field : fields) {String fieldName = field.getName() ;if (member.equals(fieldName)) {PropertyDescriptor pd = new PropertyDescriptor(fieldName,clazz);Method getMethod = pd.getReadMethod();// 获得get方法o = getMethod.invoke(obj);// 执行get方法返回一个Objectbreak ;}}return o;}/** * 用于页面传递JSON数据的类，id:xx text:xx children:xx * 将从数据库查询到的数据，用这个类进行打包，而可以将这个类直接转换成 指定的格式的JSON字符串 *  * tip:如有需要，直接继承，并添加一个自定义字段 *  * @author wang'ao *  */public static class JsonTreeObj {/** 必需的id **/private String id;/** 显示的节点文本 **/private String text;/** 是否是关闭状态 **/private String state;/** 子 **/private List<Object> children;/** *  * @param text *            节点的文本名字 * @param children *            内部节点集合 */public JsonTreeObj(String root节点, List<Object> children) {/** 保证id不重复 **/this.id = Math.random() + "";this.state = "closed";this.text = root节点;this.children = children;}/** *  */public JsonTreeObj() {// TODO Auto-generated constructor stub}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getText() {return text;}public void setText(String text) {this.text = text;}public String getState() {return state;}public void setState(String state) {this.state = state;}public List<Object> getChildren() {return children;}public void setChildren(List<Object> children) {this.children = children;}}}/** * 类型二:的测试类 * @author wang'ao * */class TestClass {private int id ;private String name ;private String pro ;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPro() {return pro;}public void setPro(String pro) {this.pro = pro;}public TestClass(int id, String name, String pro) {super();this.id = id;this.name = name;this.pro = pro;}@Overridepublic String toString() {return "TestClass [id=" + id + ", name=" + name + ", pro=" + pro+ "]";};}