ztree+java后台取数据(包括异步)生成树状图

java小白初用ztree：
ztree的官网上demo已经很详细，最近项目有用到树桩结构，自己就选择了ztree,下面从后台取数据生成树状结构的源码，官网上用到的php.
1.项目jar包：

2.实体类ZtreeNode.java，生成demo中的zNodes:

示例代码：

package com.demo.ztree.entity;

public class ZtreeNode {
    private String id;
    private Integer state;
    private String pid;
    private String icon;
    private String iconClose;
    private String iconOpen;
    private String name;
    private boolean open;
    private boolean isParent;

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{id:\"");
        sb.append(id);
        sb.append("\",pId:\"");
        sb.append(pid);
        sb.append("\",name:\"");
        sb.append(name);
        sb.append("\",state:");
        sb.append(state);
        sb.append(",icon:\"");
        sb.append(icon);
        sb.append("\",iconClose:\"");
        sb.append(iconClose);
        sb.append("\",iconOpen:\"");
        sb.append(iconOpen);
        sb.append("\",open:\"");
        sb.append(open);
        sb.append("\",isParent:\"");
        sb.append(isParent);
        sb.append("\"}");
        return sb.toString();
    }

    public String getIcon() {
        return icon;
    }

    public void setIcon(String icon) {
        this.icon = icon;
    }

    public String getIconClose() {
        return iconClose;
    }

    public void setIconClose(String iconClose) {
        this.iconClose = iconClose;
    }

    public String getIconOpen() {
        return iconOpen;
    }

    public void setIconOpen(String iconOpen) {
        this.iconOpen = iconOpen;
    }

    public boolean isOpen() {
        return open;
    }

    public void setOpen(boolean open) {
        this.open = open;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getPid() {
        return pid;
    }

    public void setPid(String pid) {
        this.pid = pid;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public boolean isIsParent() {
        return isParent;
    }

    public void setIsParent(boolean isParent) {
        this.isParent = isParent;
    }


    public Integer getState() {
        return state;
    }

    public void setState(Integer state) {
        this.state = state;
    }

    public static void main(String[] args) {
        ZtreeNode ztree1 = new ZtreeNode();
        ztree1.setId("1");
        ztree1.setPid("0");
        ztree1.setName("顶层节点");
        System.out.println(ztree1);
    }
}

其中，id、pid、isparent必须，其他的根据需求添加
3.在action中给ZtreeNode属性取值，根据业务，在数据库中取相应值，这里我就直接生成一些值：
这里根据取值过程，分为2中方式：
(1).一次性取值，传到页面：
示例代码：

public String showTree() {
        for(int i=-1;i<100000;i++){
            if(i<0){
                ZtreeNode ztree = new ZtreeNode();
                ztree.setId("0");
                ztree.setName("顶层节点 ");
                ztree.setIsParent(true);
                ztree.setIcon(icon);
                ztree.setIconClose(iconClose);
                ztree.setIconOpen(iconOpen);
                listTree.add(ztree);
            }else{
                ZtreeNode ztree = new ZtreeNode();
                ztree.setId(""+(i+1));
                ztree.setName("级节点");
                ztree.setPid(""+i/10);
                ztree.setIcon(icon);
                ztree.setIconClose(iconClose);
                ztree.setIconOpen(iconOpen);
                listTree.add(ztree);
            }
        }
        return SUCCESS;
    }

(2).异步取值返回页面：
示例代码：

public String getTree() {
        return SUCCESS;
    }
    public String asyncTree() {

        String pid = getRequest().getParameter("id");
        if(pid==null ||pid.equals("")){
            pid="0";
            ZtreeNode ztree = new ZtreeNode();
            ztree.setId("1");
            ztree.setName("顶级节点");
            ztree.setIsParent(true);
            ztree.setState(1);
            ztree.setIcon(icon);
            ztree.setIconClose(iconClose);
            ztree.setIconOpen(iconOpen);
            listTree.add(ztree);

        }else{
            for(int i=0;i<40;i++){
                ZtreeNode ztree = new ZtreeNode();
                ztree.setId(pid+i);
                ztree.setName(""+pid.length()+"级节点");
                ztree.setState(1);
                ztree.setIcon(icon);
                ztree.setIconClose(iconClose);
                ztree.setIconOpen(iconOpen);
                if(pid.length()<4){
                    ztree.setIsParent(true);
                }
                listTree.add(ztree);
            }
        }
        json = JSONArray.fromObject(listTree);
        return SUCCESS;
    }

4.页面
(1).一次性取值，传到页面：
示例代码：

<html>
<head>
<meta charset="utf-8">
<title>ztreetitle>
<link href="${request.contextPath}/css/zTreeStyle/zTreeStyle.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="${request.contextPath}/js/jquery-1.8.3.js">script>
<script type="text/javascript" src="${request.contextPath}/js/jquery.ztree.all-3.5.min.js">script>
<script type=text/javascript>
     var zNodes = ${listTree};
    var setting = {
            check: {
                enable: true,
                chkboxType: {"Y":"s", "N":"ps"}
            },
            data: {
                simpleData: {
                    enable: true
                }
            }
        };
    $(document).ready(function(){
        $.fn.zTree.init($("#treeDemo"), setting, zNodes);
    });
script>

head>
<body>
<div class="zTreeDemoBackground left">
        <ul id="treeDemo" class="ztree">ul>
div>

<body >
html>

(2).异步取值返回页面：
示例代码：

<html>
<head>
<meta charset="utf-8">
<title>ztreetitle>
<link href="${request.contextPath}/css/zTreeStyle/zTreeStyle.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="${request.contextPath}/js/jquery-1.8.3.js">script>
<script type="text/javascript" src="${request.contextPath}/js/jquery.ztree.all-3.5.min.js">script>
<script type=text/javascript>
var setting = {
            view: {
                showLine: false,
                addDiyDom: addDiyDom
            },
            async: {
                enable: true,
                autoParam: ["id"],
                url: "${request.contextPath}/asyncTree.action",
                dataFilter: filter
            },
            check: {
                enable: true,
                chkboxType: {"Y":"s", "N":"ps"}
            },
            callback: {
                onAsyncSuccess: zTreeOnAsyncSuccess
            },
            data: {
                simpleData: {
                    enable: true
                }
            }
        };
    $(document).ready(function(){
        $.fn.zTree.init($("#treeDemo"), setting);
    });

    var zTree = $.fn.zTree.getZTreeObj("treeDemo");

function zTreeOnAsyncSuccess(event, treeId, treeNode, msg) {
    if(treeNode==null){
        var zTree = $.fn.zTree.getZTreeObj("treeDemo");
        nodes = zTree.getNodes();
        for (var i=0, l=nodes.length; itrue, false, false);
        }
        asyncNodes(zTree.getNodes());
         if (!goAsync) {
            curStatus = "";
         }
    }
};

function asyncNodes(nodes) {
        if (!nodes) return;
        curStatus = "async";
        var zTree = $.fn.zTree.getZTreeObj("treeDemo");
        for (var i=0, l=nodes.length; iif (nodes[i].isParent && nodes[i].zAsync) {
                asyncNodes(nodes[i].children);
            } else {
                goAsync = true;
                zTree.reAsyncChildNodes(nodes[i], "refresh", true);
            }
        }
    }

function filter(treeId, parentNode, childNodes) {
            if (!childNodes) return null;
            for (var i=0, l=childNodes.length; i/\.n/g, '.');
            }
            return childNodes;
        }

function addDiyDom(treeId, treeNode) {
    var aObj = $("#" + treeNode.tId + "_a");
    if ($("#diyBtn_"+treeNode.id).length>0) return;
    switch (treeNode.state) {
        case 0:
            var editStr = "未审核";
            break;
        case 1:
            var editStr = "正常";
            break;
        case 2:
            var editStr = "锁定";
            break;
        default:
            var editStr = "未知状态";
            break;
        }
    aObj.append(editStr);
}
script>

head>
<body>
<div class="zTreeDemoBackground left">
        <ul id="treeDemo" class="ztree">ul>
div>

<body >
html>

5.struts.xml配置：

<struts>

    <constant name="struts.devMode" value="true" />
    <package name="default-package" extends="json-default">
        <result-types>
            <result-type name="json" class="org.apache.struts2.json.JSONResult"/>
        result-types>
        <interceptors>
            <interceptor name="json" class="org.apache.struts2.json.JSONInterceptor"/>
        interceptors>
    package>
    <package name="default" namespace="/"  extends="default-package">
        <action name="showTree" class="com.demo.ztree.action.HelloAction"
            method="showTree">
            <result name="success" type="freemarker">/hello.ftlresult>
        action>
        <action name="getTree" class="com.demo.ztree.action.HelloAction"
            method="getTree">
            <result name="success" type="freemarker">asyncZtree.ftlresult>
        action>
        <action name="asyncTree" class="com.demo.ztree.action.HelloAction"
            method="asyncTree">
             <result name="success" type="json"> 
                     <param name="root">jsonparam> 
             result>
        action>
    package>

struts>

6.效果图：

7.可以根据自己的业务要求自己选用和改进，这里包含了：
(1)checked框的提交;
(2)异步加载，显示1级节点后，后台自动加载下级节点。