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JAVA根据数据库表内容生产树结构JSON数据的实例代码
时间：2017-01-09 编辑：简简单单 来源：一聚教程网
1、利用场景
组织机构树，通常会有组织机构表，其中有code(代码),pcode(上级代码),name(组织名称)等字段
2、构造数据（以下数据并不是组织机构数据，而纯属本人胡编乱造的数据）
|
List
tests.add(newTest("0","","关于本人"));
tests.add(newTest("1","0","技术学习"));
tests.add(newTest("2","0","兴趣"));
tests.add(newTest("3","1","JAVA"));
tests.add(newTest("4","1","oracle"));
tests.add(newTest("5","1","spring"));
tests.add(newTest("6","1","springmvc"));
tests.add(newTest("7","1","fastdfs"));
tests.add(newTest("8","1","linux"));
tests.add(newTest("9","2","骑行"));
tests.add(newTest("10","2","吃喝玩乐"));
tests.add(newTest("11","2","学习"));
tests.add(newTest("12","3","String"));
tests.add(newTest("13","4","sql"));
tests.add(newTest("14","5","ioc"));
tests.add(newTest("15","5","aop"));
tests.add(newTest("16","1","等等"));
tests.add(newTest("17","2","等等"));
tests.add(newTest("18","3","等等"));
tests.add(newTest("19","4","等等"));
tests.add(newTest("20","5","等等"));
|
3、源码
Tree.java
|
packagepers.kangxu.datautils.bean.tree;
importjava.util.ArrayList;
importjava.util.List;
importjava.util.Map;
importcom.alibaba.fastjson.JSON;
/**
* tree TODO
*
* @author kangxu2 2017-1-7
*
*/
publicclassTree
/**
* 节点ID
*/
privateString id;
/**
* 显示节点文本
*/
privateString text;
/**
* 节点状态，open closed
*/
privateString state ="open";
/**
* 节点是否被选中 true false
*/
privatebooleanchecked =false;
/**
* 节点属性
*/
privateList
/**
* 节点的子节点
*/
privateList
/**
* 父ID
*/
privateString parentId;
/**
* 是否有父节点
*/
privatebooleanisParent =false;
/**
* 是否有子节点
*/
privatebooleanisChildren =false;
publicString getId() {
returnid;
}
publicvoidsetId(String id) {
this.id = id;
}
publicString getText() {
returntext;
}
publicvoidsetText(String text) {
this.text = text;
}
publicString getState() {
returnstate;
}
publicvoidsetState(String state) {
this.state = state;
}
publicbooleanisChecked() {
returnchecked;
}
publicvoidsetChecked(booleanchecked) {
this.checked = checked;
}
publicList
returnattributes;
}
publicvoidsetAttributes(List
this.attributes = attributes;
}
publicList
returnchildren;
}
publicvoidsetChildren(List
this.children = children;
}
publicbooleanisParent() {
returnisParent;
}
publicvoidsetParent(booleanisParent) {
this.isParent = isParent;
}
publicbooleanisChildren() {
returnisChildren;
}
publicvoidsetChildren(booleanisChildren) {
this.isChildren = isChildren;
}
publicString getParentId() {
returnparentId;
}
publicvoidsetParentId(String parentId) {
this.parentId = parentId;
}
publicTree(String id, String text, String state,booleanchecked,
List
booleanisParent,booleanisChildren, String parentID) {
super();
this.id = id;
this.text = text;
this.state = state;
this.checked = checked;
this.attributes = attributes;
this.children = children;
this.isParent = isParent;
this.isChildren = isChildren;
this.parentId = parentID;
}
publicTree() {
super();
}
@Override
publicString toString() {
returnJSON.toJSONString(this);
}
}
|
BuildTree.java
|
packagepers.kangxu.datautils.common.tree;
importjava.util.ArrayList;
importjava.util.List;
importpers.kangxu.datautils.bean.tree.Tree;
/**
* 构建tree
* TODO
*
* @author kangxu2 2017-1-7
*
*/
publicclassBuildTree {
/**
*
* TODO
*
* @author kangxu2 2017-1-7
*
* @param nodes
* @return
*/
publicstatic
if(nodes ==null){
returnnull;
}
List
for(Tree
String pid = children.getParentId();
if(pid ==null||"".equals(pid)) {
topNodes.add(children);
continue;
}
for(Tree
String id = parent.getId();
if(id !=null&& id.equals(pid)) {
parent.getChildren().add(children);
children.setParent(true);
parent.setChildren(true);
continue;
}
}
}
Tree
if(topNodes.size() ==0) {
root = topNodes.get(0);
}else{
root.setId("-1");
root.setParentId("");
root.setParent(false);
root.setChildren(true);
root.setChecked(true);
root.setChildren(topNodes);
root.setText("顶级节点");
}
returnroot;
}
}
|
BuildTreeTester.java
|
packagepers.kangxu.datautils.test;
importjava.util.ArrayList;
importjava.util.List;
importpers.kangxu.datautils.bean.tree.Tree;
importpers.kangxu.datautils.common.tree.BuildTree;
publicclassBuildTreeTester {
publicstaticvoidmain(String[] args) {
List
List
tests.add(newTest("0","","关于本人"));
tests.add(newTest("1","0","技术学习"));
tests.add(newTest("2","0","兴趣"));
tests.add(newTest("3","1","JAVA"));
tests.add(newTest("4","1","oracle"));
tests.add(newTest("5","1","spring"));
tests.add(newTest("6","1","springmvc"));
tests.add(newTest("7","1","fastdfs"));
tests.add(newTest("8","1","linux"));
tests.add(newTest("9","2","骑行"));
tests.add(newTest("10","2","吃喝玩乐"));
tests.add(newTest("11","2","学习"));
tests.add(newTest("12","3","String"));
tests.add(newTest("13","4","sql"));
tests.add(newTest("14","5","ioc"));
tests.add(newTest("15","5","aop"));
tests.add(newTest("16","1","等等"));
tests.add(newTest("17","2","等等"));
tests.add(newTest("18","3","等等"));
tests.add(newTest("19","4","等等"));
tests.add(newTest("20","5","等等"));
for(Test test : tests) {
Tree
tree.setId(test.getId());
tree.setParentId(test.getPid());
tree.setText(test.getText());
trees.add(tree);
}
Tree
System.out.println(t);
}
}
classTest {
privateString id;
privateString pid;
privateString text;
publicString getId() {
returnid;
}
publicvoidsetId(String id) {
this.id = id;
}
publicString getPid() {
returnpid;
}
publicvoidsetPid(String pid) {
this.pid = pid;
}
publicString getText() {
returntext;
}
publicvoidsetText(String text) {
this.text = text;
}
publicTest(String id, String pid, String text) {
super();
this.id = id;
this.pid = pid;
this.text = text;
}
publicTest() {
super();
}
@Override
publicString toString() {
return"Test [id="+ id +", pid="+ pid +", text="+ text +"]";
}
}
|
4、运行结果
JSON数据：
|
{
"checked":true,
"children": [
{
"checked":false,
"children": [
{
"checked":false,
"children": [
{
"checked":false,
"children": [
{
"checked":false,
"children": [],
"id":"12",
"parent":true,
"parentId":"3",
"state":"open",
"text":"String"
},
{
"checked":false,
"children": [],
"id":"18",
"parent":true,
"parentId":"3",
"state":"open",
"text":"等等"
}
],
"id":"3",
"parent":true,
"parentId":"1",
"state":"open",
"text":"JAVA"
},
{
"checked":false,
"children": [
{
"checked":false,
"children": [],
"id":"13",
"parent":true,
"parentId":"4",
"state":"open",
"text":"sql"
},
{
"checked":false,
"children": [],
"id":"19",
"parent":true,
"parentId":"4",
"state":"open",
"text":"等等"
}
],
"id":"4",
"parent":true,
"parentId":"1",
"state":"open",
"text":"oracle"
},
{
"checked":false,
"children": [
{
"checked":false,
"children": [],
"id":"14",
"parent":true,
"parentId":"5",
"state":"open",
"text":"ioc"
},
{
"checked":false,
"children": [],
"id":"15",
"parent":true,
"parentId":"5",
"state":"open",
"text":"aop"
},
{
"checked":false,
"children": [],
"id":"20",
"parent":true,
"parentId":"5",
"state":"open",
"text":"等等"
}
],
"id":"5",
"parent":true,
"parentId":"1",
"state":"open",
"text":"spring"
},
{
"checked":false,
"children": [],
"id":"6",
"parent":true,
"parentId":"1",
"state":"open",
"text":"springmvc"
},
{
"checked":false,
"children": [],
"id":"7",
"parent":true,
"parentId":"1",
"state":"open",
"text":"fastdfs"
},
{
"checked":false,
"children": [],
"id":"8",
"parent":true,
"parentId":"1",
"state":"open",
"text":"linux"
},
{
"checked":false,
"children": [],
"id":"16",
"parent":true,
"parentId":"1",
"state":"open",
"text":"等等"
}
],
"id":"1",
"parent":true,
"parentId":"0",
"state":"open",
"text":"技术学习"
},
{
"checked":false,
"children": [
{
"checked":false,
"children": [],
"id":"9",
"parent":true,
"parentId":"2",
"state":"open",
"text":"骑行"
},
{
"checked":false,
"children": [],
"id":"10",
"parent":true,
"parentId":"2",
"state":"open",
"text":"吃喝玩乐"
},
{
"checked":false,
"children": [],
"id":"11",
"parent":true,
"parentId":"2",
"state":"open",
"text":"学习"
},
{
"checked":false,
"children": [],
"id":"17",
"parent":true,
"parentId":"2",
"state":"open",
"text":"等等"
}
],
"id":"2",
"parent":true,
"parentId":"0",
"state":"open",
"text":"兴趣"
}
],
"id":"0",
"parent":false,
"parentId":"",
"state":"open",
"text":"关于本人"
}
],
"id":"-1",
"parent":false,
"parentId":"",
"state":"open",
"text":"顶级节点"
}
|
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