easyui struts后台实现tree返回json数据

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首先jsp页面有一ul用于展现tree

<ul id="trueULid"></ul>

加载tree

<script type="text/javascript">$(function() {   $('#trueULid').tree( {  url : 'admin/HhTestTree.do'   });});</script>

配置action

<action name="HhTestTree" method="testTree" class="org.bkgd.ehome.jeeplugin.message.web.action.ActionHhMessageTypeQuery"> <result type="json">  <param name="root">testTreeNodes</param> </result></action>

需要封装对象tree

public class TestTreeNode implements Serializable { /**  *   */ private static final long serialVersionUID = 1L; private String id; private String text; private String state = "open"; private boolean checked; public TestTreeNode(String id, String text, String state, boolean checked) {  this.id = id;  this.text = text;  this.state = state;  this.checked = checked; } public String getId() {  return id; } public void setId(String id) {  this.id = id; } public String getText() {  return text; } public boolean isChecked() {  return checked; } public void setChecked(boolean checked) {  this.checked = checked; } public void setText(String text) {  this.text = text; } public String getState() {  return state; } public void setState(String state) {  this.state = state; }}

表结构如图

首先查询所有parentid为NONE的数据(测试数组件的ID为null)然后同时判断该节点下是否有子节点，
如果有则状态是关闭状态
当继续展开树的时候会将该ID值传入，然后查询该节点的子节点。

action方法实现

private List<TestTreeNode> testTreeNodes = new ArrayList<TestTreeNode>();private String id;// 树组件使用的IDpublic String testTree() { try {  List<Map<String,Object>> list = aloneIMP.getTreeNodes(id).search().getResultList();  for(Map<String,Object> m:list){   //判断是否有子节点   List<Map<String,Object>> isHasChildren = aloneIMP.getTreeChildren(null).addUserWhere(" and parentid ='"+(String)m.get("ID")+"'").search().getResultList();   if(isHasChildren.size()==0){    testTreeNodes.add(new TestTreeNode((String)m.get("ID"),(String)m.get("NAME"),"open",false));    }else{    testTreeNodes.add(new TestTreeNode((String)m.get("ID"),(String)m.get("NAME"),"closed",false));   }       } } catch (SQLException e) {  e.printStackTrace(); } return SUCCESS;}

此方法不具公共性，是自己的一些封装实现。主要是如何进行查询节点，

getTreeNodes()的实现方法为：

@Overridepublic DataQuery getTreeNodes(String id) { if(id==null){  dbQuery = DataQuery  .init(    query,    "hh_message_type",    "ID,STATE,PARENTID,NAME,TITLE").addUserWhere(" and parentid = 'NONE'"); }else{  dbQuery = DataQuery  .init(    query,    "hh_message_type",    "ID,STATE,PARENTID,NAME,TITLE").addUserWhere(" and parentid = '"+id+"'"); }  return dbQuery;}

getTreeChildren()的实现方法为：

@Override public DataQuery getTreeChildren(DataQuery query) {  DataQuery dbQuery = DataQuery   .init(     query,     "hh_message_type",     "ID,STATE,PARENTID,NAME,TITLE");  return dbQuery; }

实现效果图为：

修正版参见：EasyUI实现异步加载tree(整合Struts2)

项目源码下载：http://download.csdn.net/detail/itmyhome/7852021

easyui struts后台实现tree返回json数据

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