java递归菜单树转换成pojo对象

package com.cjonline.foundation.authority.pojo;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.apache.log4j.Logger;

import com.cjonline.foundation.util.CheckNullEmpty;

/**
* 实现递归的帮助类，最终的结果可以描述成如下：
* 根(root)
* --1(子系统1)
* -----1.1
* -------1.1.1
* -------1.1.2
* ------- ....
* -----1.2
* --2(子系统2)
* -----2.1
* -------2.1.1
* -------2.1.2
* ------- ....
* -----2.2
*/
public class ModelList implements java.io.Serializable {

private static final Logger logger = Logger.getLogger(ModelList.class);

private static final long serialVersionUID = 6384598893693849820L;

/**
* model代表当前模块
*/
private SysModel model;
/**
* models代表当前模块下面的子模块，
*/
private List<ModelList> subList = new ArrayList<ModelList>();

/**
* 菜单级别
*/
private int flag = 0;

public SysModel getModel() {
return model;
}
public void setModel(SysModel model) {
this.model = model;
}
public List<ModelList> getSubList() {
return subList;
}
public void setSubList(List<ModelList> subList) {
this.subList = subList;
}
public void setFlag(int flag) {
this.flag = flag;
}

public int getFlag() {
return flag;
}
/**
* 递归方法根据传入的模块集合形成层级菜单
*/
@SuppressWarnings("unchecked")
public ModelList createTree2(List<SysModel> ms) {
//
ModelList node = new ModelList();
ArrayList<SysModel> fu = new ArrayList<SysModel>();// 用来存储parentId为空的父节点；
ArrayList<SysModel> childs = new ArrayList<SysModel>();// 用来存储不是系统的模块
// 将系统和模块菜单分开
for (Iterator<SysModel> it = ms.iterator(); it.hasNext();) {
SysModel mode = (SysModel) it.next();
String parentId = mode.getParentId();
if (parentId == null || parentId.equals("")) {
fu.add(mode);
} else {
childs.add(mode);
}
}
//由于是多个子系统，首先要找出有多少个子系统
for (SysModel model : fu) {
ModelList node1 = new ModelList();
node1.setFlag(0);
node1.setModel(model);
node.subList.add(node1);
appendChild(node1, childs);
}
return node;

}

/**
* node节点 childs为所以系统下的子节点
*/
public void appendChild(ModelList node, List<SysModel> childs) {
if (node != null) {
String systemId = node.getModel().getSystemId();
String smid = node.getModel().getSysModuleId();
int flag = node.getFlag();
if (childs != null && childs.size() > 0) {
for (SysModel model : childs) {
String systemId2 = model.getSystemId();
String parentId2 = model.getParentId();
if (systemId.equals(systemId2)) {
if (parentId2.equals(smid)) {
ModelList child = new ModelList();
child.setModel(model);
child.setFlag(flag + 1);
node.getSubList().add(child);
appendChild(child, childs);
}
}
}
}
}
}
}