package ajax.ch3.treeview;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Vector;
public class treeviewRender {
static public String renderStatic(TreeviewElement treeElmt, boolean bHidden) {
StringBuffer content = new StringBuffer();
content.append("<li id=" + treeElmt.getID() + ">");//显示li元素
if (bHidden && treeElmt.canExpand())//如果可以展开并且初始化为隐藏,则显示展开图片，并添加showHide事件
content.append("<img src=images/plus.gif onClick=\"showHide('"
+ treeElmt.getID() + "')\">");
else if (treeElmt.canExpand())//如果可以展开,则显示折叠图片，并添加showHide事件
content.append("<img src=images/minus.gif onClick=\"showHide('"
+ treeElmt.getID() + "')\">");
else//否则显示空白图片
content.append("<img src=images/blank.gif>");
content.append("<img src=images/folder.gif><a href=\"#\"");//添加文件夹图片
if (treeElmt.canExpand())//如果可以展开，为节点添加showHide事件
content.append("onClick=\"showHide('" + treeElmt.getID() + "')\"");
content.append(">" + treeElmt.getNodeName() + "</a>");
if (treeElmt.canExpand()) {//如果可以展开，则用UL标记显示子结点
content.append("<ul");
if (bHidden)
content.append(" style=\"display:none;\" ");
content.append(">");
TreeviewElement[] elmts = treeElmt.getChildren();//获得此结点的子节点
for (int i = 0; i < elmts.length; i++)
content.append(renderStatic(elmts[i], bHidden));//递归调用显示子节点
content.append("</ul>");
}
content.append("</li>");//结束显示<li>元素
return content.toString();
}
static public TreeviewElement[] getTopCategory() {
String sql = "select category_id from product_category where parent_category_id=0";
ResultSet rs = DbManager.getResultSet(sql);// 执行sql语句并返回ResultSet
try {
rs.last();// 移动到最后一行
int row = rs.getRow();// 得到总记录数
if (row <= 0) {
return null;
} else {
Vector vData = new Vector();
rs.beforeFirst();
while (rs.next())
vData.add("" + rs.getInt("CATEGORY_ID"));
TreeviewElement[] children = new TreeviewElement[vData.size()];
for (int i = 0; i < vData.size(); i++) {
int id = Integer.parseInt((String) vData.get(i));
children[i] = new Category(id);
}
return children;
}
} catch (SQLException e) {
e.printStackTrace();
return null;
} finally {
try {// 最后关闭ResutltSet,Statement.并释放连接
if (rs != null)
rs.close();
if (rs.getStatement() != null)
rs.getStatement().close();
DbManager.releaseConnection();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
static public String renderSimple(TreeviewElement treeElmt) {
StringBuffer content = new StringBuffer();
content.append("<li id=" + treeElmt.getID() + "><a href=\"#\">");
content.append( treeElmt.getNodeName() + "</a>");
if (treeElmt.canExpand()) {
content.append("<ul>");
TreeviewElement[] elmts = treeElmt.getChildren();
for (int i = 0; i < elmts.length; i++)
content.append(renderSimple(elmts[i]));
content.append("</ul>");
}
content.append("</li>");
return content.toString();
}
static public String renderTreeViewAjax(TreeviewElement treeElmt,boolean bRenderChildren) {
StringBuffer content = new StringBuffer();
content.append("<li id="+treeElmt.getID()+">");
if (treeElmt.canExpand())
content.append("<img src=images/plus.gif onClick=\"getSubTree('"+treeElmt.getID()+"')\">");
else
content.append("<img src=images/blank.gif>");
content.append("<img src=images/folder.gif><a href=\"#\"");
if (treeElmt.canExpand())
content.append(" onClick=\"getSubTree('"+treeElmt.getID()+"')\"");
content.append(">"+treeElmt.getNodeName()+"</a>");
if ( bRenderChildren&&treeElmt.canExpand( ))
{
content.append("<ul>");
TreeviewElement[] elmts = treeElmt.getChildren();
for (int i=0;i<elmts.length;i++)
content.append(renderTreeViewAjax(elmts[i],false));
content.append("</ul>");
}
content.append("</li>");
return content.toString();
}
}
ajax_4_08.rar （25个子文件） 
ajax_4_08 
dynamicTree.jsp 669B css tree.css 453B WEB-INF web.xml 567B lib 
mysql.jar 231KB classes TreeviewServlet.java 1004B ajax ch3 treeview TreeviewElement.class 285B DbManager.class 1KB treeviewRender.class 4KB TreeviewServlet.class 1KB Category.class 4KB treeviewRender.java 4KB TreeviewElement.java 269B Category.java 4KB DbManager.java 2KB META-INF MANIFEST.MF 39B staticTree.jsp 579B images 
blank.gif 54B plus.gif 200B minus.gif 197B sheet.gif 75B loading.gif 2KB Thumbs.db 13KB folder.gif 572B js all.js 3KB db.sql 1KB
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