从http://www.destroydrop.com/javascripts/tree/下载dtree.zip压缩包，解压后我们会用到dtree.js、dtree.css和img文件夹。
1.TreeInfo.java
 package com.yxx;
  public class TreeInfo  {
 private int nodeId = -1;
private int parentId = -1;
private String nodeName = null;
private String url = null;
private String target = null;
  public int getNodeId() {
return nodeId;
 }
public void setNodeId(int nodeId) {
this.nodeId = nodeId;
}
public int getParentId() {
return parentId;
}
public void setParentId(int parentId) {
this.parentId = parentId;
}
public String getNodeName() {
return nodeName;
}
public void setNodeName(String nodeName) {
this.nodeName = nodeName;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getTarget() {
return target;
}
public void setTarget(String target) {
this.target = target;
}
 }
2.TreeUtil.java
package com.yxx;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
public class TreeUtil {
/** *//**
* @从数据库中读取tree的信息
* @return
*/
public static List<TreeInfo> retrieveNodeInfos() {
List<TreeInfo> treeInfoList = new ArrayList<TreeInfo>();
String driverName = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/test";
Connection connection = null;
PreparedStatement preparedStatement = null;
ResultSet rs = null;
try {
Class.forName(driverName).newInstance();
connection = DriverManager.getConnection(url, "root", "1234");
String sql = "select * from tree_info";
preparedStatement = connection.prepareStatement(sql);
rs = preparedStatement.executeQuery();
TreeInfo treeInfo = null;
while (rs != null && rs.next()) {
treeInfo = new TreeInfo();
treeInfo.setNodeId(rs.getInt(1));
treeInfo.setParentId(rs.getInt(2));
treeInfo.setNodeName(rs.getString(3));
treeInfo.setUrl(rs.getString(4));
treeInfoList.add(treeInfo);
}
} catch (Exception e) {
System.out.println(e);
}
return treeInfoList;
}
/** *//**
* @生成创建tree的脚本
* @param treeInfoList
* @return
*/
public static String createTreeInfo(List<TreeInfo> treeInfoList) {
StringBuffer contents = new StringBuffer();
contents.append("<script type='text/javascript'>\n");
contents.append("d = new dTree('d');\n");
TreeInfo treeInfo = null;
for (int i = 0; i < treeInfoList.size(); i++) {
treeInfo = (TreeInfo) treeInfoList.get(i);
contents.append(createOneItem(treeInfo));
}
contents.append("document.write(d);");
contents.append("\n</script>");
return contents.toString();
}
/** *//**
* @生成创建一个条目的脚本
* @param treeInfo
* @return
*/
public static String createOneItem(TreeInfo treeInfo) {
StringBuffer item = new StringBuffer();
item.append("d.add(");
// 第一个参数，表示当前节点的ID
item.append(treeInfo.getNodeId() + ",");
// 第二个参数，表示当前节点的父节点的ID,根节点的值为 -1
item.append(treeInfo.getParentId() + ",");
// 第三个参数，节点要显示的文字
item.append("'" + treeInfo.getNodeName() + "',");
// 第四个参数，节点的Url
item.append("'" + treeInfo.getUrl() + "',");
// 第五个参数，鼠标移至该节点时节点的Title
item.append("'" + treeInfo.getNodeName() + "',");
// 第六个参数，节点的target
item.append("'blank',");
// 第七个参数，用做节点的图标,节点没有指定图标时使用默认值
item.append("'',");
// 第八个参数，用做节点打开的图标,节点没有指定图标时使用默认值
item.append("'',");
// 第九个参数，判断节点是否打开
item.append(false);
item.append(");\n");
return item.toString();
}
/** *//**
* @取得脚本
* @return
*/
public String getMenuJS() {
String js = "";
List<TreeInfo> treeInfoList = TreeUtil.retrieveNodeInfos();
js = TreeUtil.createTreeInfo(treeInfoList);
return js;
}
/** *//**
* @测试生成的JS
* @param args
*/
public static void main(String[] args) {
List<TreeInfo> treeInfoList = TreeUtil.retrieveNodeInfos();
System.out.println(TreeUtil.createTreeInfo(treeInfoList));
}
}
3.index.jsp
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<jsp:useBean id="treeUtil" scope="request" class="com.yxx.TreeUtil" />
<html>
<head>
<title>Tree</title>
<link rel="StyleSheet" href="dtree.css" type="text/css" />
<script type="text/javascript" src="dtree.js"></script>
</head>
<body>
<div class='dtree'>
<%=treeUtil.getMenuJS()%>
</div>
</body>
</html>
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