基本上，您并不想直接在控制器中执行此操作。 （松散耦合）
我会创建 2 个实用程序类 Tree<T> 和 Node<T> 来管理您的树和节点：
这是树类：
public class Tree<T> {
private Node<T> rootElement;
public Tree() {
super();
}
public Node<T> getRootElement() {
return this.rootElement;
}
public void setRootElement(final Node<T> rootElement) {
this.rootElement = rootElement;
}
public List<Node<T>> toList() {
final List<Node<T>> list = new ArrayList<Node<T>>();
walk(this.rootElement, list);
return list;
}
private void walk(final Node<T> element, final List<Node<T>> list) {
list.add(element);
for (final Node<T> data : element.getChildren()) {
walk(data, list);
}
}
}
还有带有一些辅助方法的节点类
public class Node<T> {
private T data;
private List<Node<T>> children;
public Node() {
super();
}
public Node(final T data) {
this();
setData(data);
}
public Boolean hasChildren() {
return this.children.size() != 0;
}
public List<Node<T>> getChildren() {
if (this.children == null) {
return new ArrayList<Node<T>>();
}
return this.children;
}
public void setChildren(final List<Node<T>> children) {
this.children = children;
}
public int getNumberOfChildren() {
return this.children.size();
}
public void addChild(final Node<T> child) {
if (this.children == null) {
this.children = new ArrayList<Node<T>>();
}
this.children.add(child);
}
public void insertChildAt(final int index, final Node<T> child) throws IndexOutOfBoundsException {
if (index == getNumberOfChildren()) {
addChild(child);
return;
} else {
this.children.get(index);
this.children.add(index, child);
}
}
public void removeChildAt(final int index) throws IndexOutOfBoundsException {
this.children.remove(index);
}
public T getData() {
return this.data;
}
public void setData(final T data) {
this.data = data;
}
}
然后我会让你的树扩展树。基于您的控制器 CourtBranch
假设您的 CourtBranch 模型具有以下结构（我使用的是 hibernate + jpa）：
@Entity
@Table
public class CourtBranch
private String id;
private String name;
private Long partentId;
//getters setters etc...
创建一个扩展树的类：
public class CourtBranchTree extends Tree<CourtBranch>
public CourtBranchTree{
super();
}
现在创建您的 TreeGridResponse 类：
public class TreeGridResponse {
//inject the service to get the id of your model
@Resource
CourtBranchService cbService;
//if you are using a repository for the db queries:
@Resource
CourtBranchRepository cbRepo;
public TreeGridResponse(){
}
//returning the tree as a JSON to use AJAX
public String cbBTreeAsJson(final CourtBranchTree tree){
final StringBuffer sb = new StringBuffer();
final CourtBranch root = tree.getRootElement().getData();
sb.append("[\r {\"title\": \"" + root.getName() + "\", \"key\": \"" + root.getId() + "\", \"children\": [\r");
final List<Node<CourtBranch>> children = tree.getRootElement().getChildren();
loopforChildre(sb, children);
sb.append("]");
return sb.toString();
}
private StringBuffer loopForChildren(final StringBuffer sb, final List<Node<UserRight>> children) {
for (int i = 0; i < children.size(); i++) {
final Node<courtBranch> childElement = children.get(i);
if (i == 0) {
sb.append("{\"title\": \"" + childElement.getData().getName() + "\", \"key\": \"" + childElement.getData().getId() + "\"");
} else {
sb.append(", {\"title\": \"" + childElement.getData().getName() + "\", \"key\": \"" + childElement.getData().getId() + "\"");
}
if (childElement.hasChildren()) {
sb.append(", \"children\": [\r");
loopForChildren(sb, childElement.getChildren());
} else {
sb.append("}");
}
}
sb.append("]}");
return sb;
}
public CourtBranchTree get() {
final CourtBranchTreetree tree = new CourtBranchTree();
final Node<CourtBranch> root = new Node<CourtBranch> (this.cbRepo.findOne(Long.valueOf(1)));//gets your root
getRecursive(root, tree);
tree.setRootElement(root);
return tree;
}
private void getRecursive(final Node<CourtBranch> courtBranch, final CourtBranchTree tree) {
final List<CourtBranch> children = this.cbService.findCourtBranchByParentId(courtBranch.getData().getId());
final List<Node<CourtBranch>> childElements = new ArrayList<Node<CourtBranch>>();
for (final CourtBranch childCourtBranch : children) {
final Node<CourtBranch> childElement = new Node<CourtBranch>(childUserRight);
childElements.add(childElement);
getRecursive(childElement, tree);
}
courtBranch.setChildren(childElements);
}
}
在您的配置中注册 TreeGridResponse 以获取 bean 并将其注入您的控制器。
@Controller
public class CBController
@Resource
private TreeGridResponse gridResponse;
@RequestMapping(value="/CourtBranch/LoadTreeView", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public String cbTree() {
return this.gridResponse.cbBTreeAsJson(this.gridResponse.get());
}
注意 @ResponseBody 注释，它将指示 Spring 将您的字符串解析为 JSON，以便您的 AJAX 可以读取它。
还有你的jsp：
<div id ="cbTree"></div>
<script type ="text/javascript">
$(function(){
$("#cbTree").dynatree({
initAjax:{
url: /CourtBranch/LoadTreeView
},
checkbox: true,
selectMode: 3
});
});
</script>
希望这会有所帮助...