OA系统部门结构树

public class DepartmentUtils {

/**
* @param topList 顶级部门列表
* @param removeId 删除部门的id
* @return
*/
public static List<Department> getTreeList(List<Department> topList,Long removeId) {
List<Department> treeList = new ArrayList<Department>();

walkTree(topList,treeList,"┣",removeId);

return treeList;
}

/**
* 组织树形部门数据
*/
public static void walkTree(Collection<Department> topList,List<Department> treeList ,String prefix ,Long removeId){
for(Department d : topList){
if(removeId != null && d.getId().equals(removeId)){
//结束本次循环，直接下一次循环
continue;
}
//为了避免修改数据库，创建出新的对象，修改新的对象，在放入到treeList里面
Department copy = new Department();
copy.setId(d.getId());
copy.setName(prefix + d.getName());

//顶点
treeList.add(copy);
//子树
Set<Department> children = d.getChildren();
walkTree(children,treeList,"　" + prefix,removeId);
}
}
}

在部门action里面的调用：

public String editUI(){

//准备数据：要修改的部门
Department dept = departmentService.getById(model.getId());

//准备数据：部门列表
List<Department> topList = departmentService.findTopList();//所有顶级部门列表
List<Department> treeList = DepartmentUtils.getTreeList(topList,dept.getId());

getValueStack().set("departmentList", treeList);
getValueStack().push(dept);

if(dept.getParent() != null){
parentId = dept.getParent().getId();//设置parentId的值，用于回显
}
return "editUI";
}