先看看效果
bean类：
1 package com.lemsun.jtreport.beans.workflow;2
3 /**
4 * SysAuditotypecategory entity.
5 *
6 * @author MyEclipse Persistence Tools
7 */
8
9 public class SysAuditotypecategory implements java.io.Serializable {
10
11 // Fields
12
13 private Long id;
14 private String categoryname;
15 private SysAuditotypecategory parent;
16 // Constructors
17
18 /** default constructor */
19 public SysAuditotypecategory() {
20 }
21
22 /** full constructor */
23 public SysAuditotypecategory(String categoryname) {
24 this.categoryname = categoryname;
25 this.parent = new SysAuditotypecategory();
26 }
27
28 // Property accessors
29
30 public Long getId() {
31 return this.id;
32 }
33
34 public void setId(Long id) {
35 this.id = id;
36 }
37
38 public String getCategoryname() {
39 return this.categoryname;
40 }
41
42 public void setCategoryname(String categoryname) {
43 this.categoryname = categoryname;
44 }
45
46 public SysAuditotypecategory getParent() {
47 return this.parent;
48 }
49
50 public void setParent(SysAuditotypecategory parent) {
51 this.parent = parent;
52 }
53
54 }
action中生成下拉树的代码
1 //=================begin-取得类型树=================
2 //传入所有的列表节点
3 private List<SysAuditotypecategory> cTreeList(List<SysAuditotypecategory> aList){
4 List<SysAuditotypecategory> returnList = new ArrayList<SysAuditotypecategory>();
5 List<SysAuditotypecategory> topList = new ArrayList<SysAuditotypecategory>();
6 List<SysAuditotypecategory> tempList = new ArrayList<SysAuditotypecategory>();
7
8 //筛选出*节点
9 for (SysAuditotypecategory sacty : aList) {
10 if(sacty.getParent()==null){
11 topList.add(sacty);//是*节点
12 }else {
13 tempList.add(sacty);//不是*节点
14 }
15 }
16
17 //获取子级节点列表
18 for (int i=0;i<topList.size();i++) {
19 SysAuditotypecategory sacty = topList.get(i);
20 returnList.add(cTreeNode(sacty, "", (i+1<topList.size())));//添加自身
21
22 //添加所有子级，自身如果不是*节点列表的最后一个前面用“│”打头，如果是则用“…”打头。
23 returnList.addAll(cTreeNodeList(tempList,sacty.getId(),(i+1<topList.size())?"│":"…"));
24 }
25 return returnList;
26 }
27
28 /**
29 * 按照父节点取得所有子节点
30 * @inList 所有不是*节点的列表
31 * @parentid *节点的id
32 * @headString 前缀字符
33 */
34 private List<SysAuditotypecategory> cTreeNodeList(List<SysAuditotypecategory> inList,Long parentid,String headString){
35 List<SysAuditotypecategory> tempList1 = new ArrayList<SysAuditotypecategory>();
36 List<SysAuditotypecategory> tempList2 = new ArrayList<SysAuditotypecategory>();
37 List<SysAuditotypecategory> returnList = new ArrayList<SysAuditotypecategory>();
38
39 //取得兄弟节点和不是兄弟节点
40 for(int i=0;i<inList.size();i++){
41 SysAuditotypecategory sacty = inList.get(i);
42 if(sacty.getParent().getId() == parentid){
43 tempList1.add(sacty);//兄弟节点
44 }else {
45 tempList2.add(sacty);//子节点
46 }
47 }
48
49 if(tempList1.size()>0){
50 for(int i=0;i<tempList1.size();i++){
51 SysAuditotypecategory sacty1 = tempList1.get(i);
52 //返回列表添加自身
53 returnList.add(cTreeNode(sacty1, headString, (i+1<tempList1.size())));
54
55 //子节点个数不为0这递归这个方法。
56 if(tempList2.size()>0){
57 returnList.addAll(cTreeNodeList(tempList2,sacty1.getId(),headString+((i+1<tempList1.size())?"│":"…")));
58 }
59 }
60 }
61
62 return returnList;
63 }
64
65 private SysAuditotypecategory cTreeNode(SysAuditotypecategory satcy,String headString,boolean havenext) {
66 satcy.setCategoryname(headString.concat((havenext?"├":"└"))+satcy.getCategoryname());//添加本身，不是最末节点在前面添加"├"，只最末节点这添加"└"
67 return satcy;
68 }
69 //=================end-取得类型树=================