List生成下拉列表树

 

大家如果感兴趣可以放问这个网址

http://www.ybloy.com/post/2009/07/16/Liste98092e5bd92e7949fe68890e4b88be68b89e58897e8a1a8e6a091.aspx

里面有实现过后的效果和代码的注释。

 1    //=================begin-取得类型树=================
 2    private List<SysAuditotypecategory> cTreeList(List<SysAuditotypecategory> aList){
 3        List<SysAuditotypecategory> returnList = new ArrayList<SysAuditotypecategory>();
 4        List<SysAuditotypecategory> topList = new ArrayList<SysAuditotypecategory>();
 5        List<SysAuditotypecategory> tempList = new ArrayList<SysAuditotypecategory>();
 6
 7        for (SysAuditotypecategory sacty : aList) {
 8            if(sacty.getParent()==null){
 9                topList.add(sacty);
10            }else {
11                tempList.add(sacty);
12            }
13        }
14
15        for (int i=0;i<topList.size();i++) {
16                SysAuditotypecategory sacty = topList.get(i);
17                returnList.add(cTreeNode(sacty, "", (i+1<topList.size())));
18                returnList.addAll(cTreeNodeList(tempList,sacty.getId(),(i+1<topList.size())?"│":" "));
19            }
20        return returnList;
21    }
22
23    private List<SysAuditotypecategory> cTreeNodeList(List<SysAuditotypecategory> inList,Long parentid,String headString){
24        List<SysAuditotypecategory> tempList1 = new ArrayList<SysAuditotypecategory>();
25        List<SysAuditotypecategory> tempList2 = new ArrayList<SysAuditotypecategory>();
26        List<SysAuditotypecategory> returnList = new ArrayList<SysAuditotypecategory>();
27
28        for(int i=0;i<inList.size();i++){
29            SysAuditotypecategory sacty = inList.get(i);
30            if(sacty.getParent().getId() == parentid){
31                tempList1.add(sacty);
32            }else {
33                tempList2.add(sacty);
34            }
35        }
36
37        if(tempList1.size()>0){
38            for(int i=0;i<tempList1.size();i++){
39                SysAuditotypecategory sacty1 = tempList1.get(i);
40                returnList.add(cTreeNode(sacty1, headString, (i+1<tempList1.size())));
41
42                if(tempList2.size()>0){
43                    returnList.addAll(cTreeNodeList(tempList2,sacty1.getId(),headString+((i+1<tempList1.size())?"│":" ")));
44                }
45            }
46        }
47
48        return returnList;
49    }
50
51    private SysAuditotypecategory cTreeNode(SysAuditotypecategory satcy,String headString,boolean havenext) {
52        satcy.setCategoryname(headString.concat((havenext?"├":"└"))+satcy.getCategoryname());
53        return satcy;
54    }