Java|java教程
以及,算法,递归
Java-java教程1、准备表结构及对应的表数据
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a、表结构：
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create table TB_TREE(CID NUMBER not null,CNAME VARCHAR2(50),PID NUMBER //父节点)
b、表数据：
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insert into tb_tree (CID, CNAME, PID) values (1, 中国, 0);insert into tb_tree (CID, CNAME, PID) values (2, 北京市, 1);insert into tb_tree (CID, CNAME, PID) values (3, 广东省, 1);insert into tb_tree (CID, CNAME, PID) values (4, 上海市, 1);insert into tb_tree (CID, CNAME, PID) values (5, 广州市, 3);insert into tb_tree (CID, CNAME, PID) values (6, 深圳市, 3);insert into tb_tree (CID, CNAME, PID) values (7, 海珠区, 5);insert into tb_tree (CID, CNAME, PID) values (8, 天河区, 5);insert into tb_tree (CID, CNAME, PID) values (9, 福田区, 6);insert into tb_tree (CID, CNAME, PID) values (10, 南山区, 6);insert into tb_tree (CID, CNAME, PID) values (11, 密云县, 2);insert into tb_tree (CID, CNAME, PID) values (12, 浦东, 4);
2、TreeNode对象，对应tb_tree
public class TreeNode implements Serializable {private Integer cid;private String cname;private Integer pid;private List nodes = new ArrayList();public TreeNode() {}//getter、setter省略}
3、测试数据
public class TreeNodeTest {@Testpublic void loadTree() throws Exception{System.out.println(JsonUtils.javaToJson(recursiveTree(1)));}/*** 递归算法解析成树形结构** @param cid* @return* @author jiqinlin*/public TreeNode recursiveTree(int cid) {//根据cid获取节点对象(SELECT * FROM tb_tree t WHERE t.cid=?)TreeNode node = personService.getreeNode(cid);//查询cid下的所有子节点(SELECT * FROM tb_tree t WHERE t.pid=?)List childTreeNodes = personService.queryTreeNode(cid); //遍历子节点for(TreeNode child : childTreeNodes){TreeNode n = recursiveTree(child.getCid()); //递归node.getNodes().add(n);}return node;}}
输出的json格式如下：
{ "cid": 1, "nodes": [ {"cid": 2,"nodes": [ {"cid": 11,"nodes": [],"cname": "密云县","pid": 2 }],"cname": "北京市","pid": 1 }, {"cid": 3,"nodes": [ {"cid": 5,"nodes": [ { "cid": 7, "nodes": [ ], "cname": "海珠区", "pid": 5 }, { "cid": 8, "nodes": [ ], "cname": "天河区", "pid": 5 }],"cname": "广州市","pid": 3 }, {"cid": 6,"nodes": [ { "cid": 9, "nodes": [ ], "cname": "福田区", "pid": 6 }, { "cid": 10, "nodes": [ ], "cname": "南山区", "pid": 6 }],"cname": "深圳市","pid": 3 }],"cname": "广东省","pid": 1 }, {"cid": 4,"nodes": [ {"cid": 12,"nodes": [],"cname": "浦东","pid": 4 }],"cname": "上海市","pid": 1 } ], "cname": "中国", "pid": 0}
总结
