E3_tree刷新页面后如何自动展开选中节点？拜托了！

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E3_tree刷新页面后如何自动展开选中节点？拜托了！0

import net.jcreate.e3.tree.Node;
import net.jcreate.e3.tree.TreeDirector;
import net.jcreate.e3.tree.TreeModel;
import net.jcreate.e3.tree.UncodeException;
import net.jcreate.e3.tree.UserDataUncoder;
import net.jcreate.e3.tree.ext.ExtTreeBuilder;
import net.jcreate.e3.tree.support.AbstractWebTreeModelCreator;
import net.jcreate.e3.tree.support.DefaultTreeDirector;
import net.jcreate.e3.tree.support.WebTreeBuilder;
import net.jcreate.e3.tree.support.WebTreeNode;
import net.jcreate.e3.tree.xtree.CheckXTreeBuilder;
import net.jcreate.e3.tree.xtree.RadioXTreeBuilder;

import com.thinkroc.trps.rbac.domains.TreeBean;

public class TreeServer {
private static String[] idArray = null;

public static String getTree(HttpServletRequest request,
HttpServletResponse response, List treeList,
String[] hasResourceId, boolean isExtTree, boolean flag) {
if (hasResourceId != null) {
idArray = hasResourceId;
}

// 业务数据解码器，从业务数据中分解出id和parentid
UserDataUncoder userDataUncoder = new UserDataUncoder() {
public Object getID(Object pUserData) throws UncodeException {
TreeBean treeBean = (TreeBean) pUserData;
return treeBean.getId();
}

public Object getParentID(Object pUserData) throws UncodeException {
TreeBean treeBean = (TreeBean) pUserData;
return treeBean.getParentId();
}
};

// Tree模型构造器，用于生成树模型
AbstractWebTreeModelCreator treeModelCreator = new AbstractWebTreeModelCreator() {
// 该方法负责将业务数据映射到树型节点
protected Node createNode(Object pUserData, UserDataUncoder pUncoder) {
TreeBean treeBean = (TreeBean) pUserData;
WebTreeNode result = new WebTreeNode(treeBean.getName(),
"node_" + treeBean.getId());
result.setValue(treeBean.getId());
if (idArray != null) {
for (int i = 0; i < idArray.length; i++) {
if (idArray[i].equals(treeBean.getId())) {
result.setSelected(true);
break;
}
}
}
// action是点击按纽执行的方法.可以是url,或者javascript函数
result.setAction("javascript:action('" + treeBean.getId()
+ "')");
return result;
}
};
treeModelCreator.init(request);
TreeModel treeModel = treeModelCreator
.create(treeList, userDataUncoder);
TreeDirector director = new DefaultTreeDirector();// 构造树导向器
// 构造树Builder
WebTreeBuilder treeBuilder = null;
if (isExtTree) {
treeBuilder = new ExtTreeBuilder();
} else {
if (flag) {
treeBuilder = new CheckXTreeBuilder();
} else {
treeBuilder = new RadioXTreeBuilder();
}
}
treeBuilder.init(request);
director.build(treeModel, treeBuilder);// 执行构造
return treeBuilder.getTreeScript();// 获取构造树的脚本
}
}