java 树形结构设计(六) Struts + Hibernate

最新推荐文章于 2025-08-22 09:41:59 发布

最新推荐文章于 2025-08-22 09:41:59 发布 · 118 阅读

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#数据结构 #Java #Struts #Hibernate

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本文介绍了一种用于地理信息系统的树形数据结构实现方法。该方法通过Java编程语言定义了一个名为GeographyTreeItem的类来表示地理信息节点，并详细阐述了类的属性和方法，包括如何创建节点、设置节点属性、添加子节点以及生成HTML展示。

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step 10、构造树形结构类

java 代码

/**
* 地理信息数结构
*/
package com.fzfx88.common.tree;
import java.util.Vector;
/**
* @author huguoqing
*
*/
public class GeographyTreeItem {
public String strTitle;
public String strValue;
public String strText;
public boolean bDisplayChildren;
public String strImg;
public boolean bSelected;
public boolean bSelectable;
public boolean bLoadChildren;
public String strChildURL;
public Vector vChildren;
public GeographyTreeItem parent;
public GeographyTreeItem(String strValue, String strText, String strTitle)
{
bDisplayChildren = false;
strImg = "";
bSelected = false;
bSelectable = true;
bLoadChildren = true;
strChildURL = "";
vChildren = new Vector();
parent = null;
this.strTitle = strTitle;
this.strValue = strValue;
this.strText = strText;
}
public GeographyTreeItem(String strValue, String strText)
{
this(strValue, strText, strValue);
}
public GeographyTreeItem(String strValue)
{
this(strValue, strValue, strValue);
}
public GeographyTreeItem()
{
this("", "", "");
}
public void setImage(String strImg)
{
this.strImg = strImg;
}
public void setDisplayChildren(boolean bDisplay)
{
bDisplayChildren = bDisplay;
}
public boolean isDisplayChildren()
{
return bDisplayChildren;
}
public void setSelected(boolean bSelected)
{
this.bSelected = bSelected;
}
public boolean isSelected()
{
return bSelected;
}
public void setSelectable(boolean selectable)
{
bSelectable = selectable;
}
public boolean isSelectable()
{
return bSelectable;
}
public void addChild(GeographyTreeItem item)
{
vChildren.addElement(item);
}
public int getCount()
{
return vChildren.size();
}
public GeographyTreeItem getChild(int index)
{
if(index >= getCount())
{
return null;
} else
{
GeographyTreeItem item = (GeographyTreeItem)vChildren.get(index);
return item;
}
}
public void setLoadChildren(boolean bLoad)
{
bLoadChildren = bLoad;
}
public boolean isLoadChildren()
{
return bLoadChildren;
}
public void setURL(String strURL)
{
strChildURL = strURL;
}
public String getURL()
{
return strChildURL;
}
public String getHTML(String strPath, boolean bLine)
{
StringBuffer stHTML = new StringBuffer(1000);
if(strText != null)
{
int nlength = getRealLength(strText);
nlength = nlength * 12 + 10;
stHTML.append("《TABLE valign=top width=" + nlength + " cellSpacing=0 cellPadding=0 border=0》\r\n");
stHTML.append(" 《TR valign=top 》\r\n");
stHTML.append(" 《TD vAlign=top width=5》" + strImg + "《/TD》\r\n");
stHTML.append(" 《TD valign=top class=treeview_ob_td");
if(bSelectable)
stHTML.append(" onclick=treeview_ob_ft(this) ondoubleclick=treeview_ob_modify(this)");
stHTML.append(" title='" + strTitle + "' value='" + strValue + "' " + (bSelected ? "style=\"background-Color:#ccddee;\"" : "") + "》" + strText + "《/TD》\r\n");
stHTML.append(" 《/TR》\r\n");
stHTML.append("《/TABLE》\r\n");
}
stHTML.append(getChildHTML(strPath, bLine));
return stHTML.toString();
}
public String getChildHTML(String strPath, boolean bLine)
{
StringBuffer stHTML = new StringBuffer();
String strVertical = "";
String strVertDisp = "";
if(bLine)
strVertical = " style=\、"BACKGROUND-IMAGE: url(" + strPath + "vertical.gif)\" ";
if(getCount() > 0)
if(bLoadChildren || bDisplayChildren)
{
stHTML.append("《TABLE valign=top style=\"DISPLAY: " + (bDisplayChildren ? "block" : "none") + "\" cellSpacing=0 cellPadding=0 border=0》\r\n");
for(int i = 0; i < vChildren.size(); i++)
{
GeographyTreeItem item = getChild(i);
strVertDisp = strVertical;
String strImg_tmp = "";
String strURL = "";
if(!item.isLoadChildren())
strURL = item.getURL();
if(item.getCount() > 0)
{
if(item.isDisplayChildren())
{
if(i < vChildren.size() - 1)
{
strImg_tmp = "《IMG class=treeview_ob_ic onclick=\"treeview_ob_wk(this, '" + strURL + "')\" src=\"" + strPath + "minus.gif\" 》";
} else
{
strImg_tmp = "《IMG class=treeview_ob_ic onclick=\"treeview_ob_wk(this, '" + strURL + "')\" src=\"" + strPath + "minus_l.gif\" 》";
strVertDisp = "";
}
} else
if(i < vChildren.size() - 1)
{
strImg_tmp = "《IMG class=treeview_ob_ic onclick=\"treeview_ob_wk(this, '" + strURL + "')\" src=\"" + strPath + "plusik.gif\" 》";
} else
{
strImg_tmp = "《IMG class=treeview_ob_ic onclick=\"treeview_ob_wk(this, '" + strURL + "')\" src=\"" + strPath + "plusik_l.gif\" 》";
strVertDisp = "";
}
} else
{
if(i < vChildren.size() - 1)
strImg_tmp = "《IMG class=treeview_ob_ic src=\/"" + strPath + "hr.gif\" 》";
else
strImg_tmp = "《IMG class=treeview_ob_ic src=\/"" + strPath + "hr_l.gif\" 》";
strVertDisp = "";
}
stHTML.append(" 《TR 》\/r\/n");
stHTML.append(" 《TD class=treeview_ob_ic " + strVertDisp + " width=1 》 \/r\/n");
stHTML.append(" ").append(strImg_tmp);
stHTML.append("《/TD 》\/r\/n");
stHTML.append(" 《TD 》\/r\/n");
stHTML.append(item.getHTML(strPath, bLine));
stHTML.append(" 《/TD 》\/r\/n");
stHTML.append(" 《/TR 》\/r\/n");
}
stHTML.append("《/TABLE》\/r\/n");
} else
{
stHTML.append("《TABLE style=\"DISPLAY: " + (bDisplayChildren ? "block" : "none") + "\" cellSpacing=0 cellPadding=0 border=0》\r\n");
stHTML.append(" 《TR》\/r\/n");
stHTML.append(" 《TD class=treeview_ob_td 》正读取数据，请稍候 .../TD》\/r\/n");
stHTML.append(" 《/TR》\/r\/n");
stHTML.append("《/TABLE》\/r\/n");
}
return stHTML.toString();
}
protected int getRealLength(String strText)
{
int nCount = 0;
int nNow = -1;
int nLength = strText.length();
do
{
int nStart = strText.indexOf(60, nNow);
if(nStart == -1)
{
nCount += nLength - nNow - 1;
break;
}
nCount += nStart - nNow - 1;
int nEnd = strText.indexOf(62, nStart);
if(nEnd == -1)
{
nCount += nLength - nStart - 1;
break;
}
nNow = nEnd;
nCount += 2;
} while(true);
return nCount;
}
}