Jsp+Ajax动态树菜单(BlueTree)

package blue.lip.tags; /** * Author：李鹏 * CreateDate：2006-11-15 * Modifier：李鹏 * ModifyDate：2006-11-15 * Version:1.0 * Copyright(c)2006 李鹏 * All right reserved. */ import javax.servlet.jsp.tagext.Tag; import javax.servlet.jsp.PageContext; import javax.servlet.jsp.JspException; import java.io.IOException; import javax.servlet.jsp.JspTagException; import javax.servlet.jsp.JspWriter; import java.util.List; /** * 树标签处理类 */ public class BlueTreeTag implements Tag { private PageContext pageContext; private Tag parent; public static String rootId; //根节点ID public static String blueClass; //根据节点ID获得所有该节点子节点的实现类 public static String blueURL; //点击节点超连接---isUseDataURL为false时有用 public static boolean isUseDataURL; //是否使用节点封装对象的节点超连接 public static String rootName; //根节点名称 public static String imageURL; //所有图片目录路径 public static String rootImage; //根节点图片 public static String folderImg; //有子节点关闭图片 public static String folderOpenImg; //有子节点展开图片 public static String fileImg; //无子节点图片 public static String openImg; //节点展开图片 public static String closeImg; //节点关闭图片 public static String elementLineImg; //带有节点的线图片 public static String lineImg; //无节点的线图片 public static String endLineImg; //最后一个节点线图片 public static String endFolderOpenImg; //最后一个有子节点展开图片 public static String endFolderCloseImg; //最后一个有子节点关闭图片 public static boolean isFolderURL; //是否给有子节点的节点加超连接---isUseDataURL为false时有用 public static String rootURL; //根节点连接 public static String target; //所有连接的target属性 public static String linkClass; //超连接样式 public static String styleClass; //总样式 public static String imgClass; //图片样式 public static String useDataImg; //节点图片是否使用数据类图片，no为不使用，first为仅第一级目录使用，all全部使用 public static String js; //设置JS文件位置 public static String onMouseOver; //鼠标经过每个节点时的样式 public static String onMouseOut; //鼠标离开每个节点时的样式 public BlueTreeTag() { super(); this.rootId = "0"; this.blueClass = null; //必须设置 this.blueURL = "#"; this.isUseDataURL = false; this.rootName = "根节点"; this.rootImage = "rootImage.gif"; this.imageURL = null; //必须设置 this.folderImg = "folder.gif"; this.folderOpenImg = "folderOpen.gif"; this.fileImg = "file.gif"; this.openImg = "open.gif"; this.closeImg = "close.gif"; this.elementLineImg = "elementLine.gif"; this.lineImg = "line.gif"; this.endLineImg = "endLine.gif"; this.endFolderOpenImg = "endFolderOpen.gif"; this.endFolderCloseImg = "endFolderClose.gif"; this.isFolderURL = true; this.rootURL = "#"; this.target = "_blank"; this.linkClass=""; this.imgClass=""; this.styleClass=""; this.useDataImg="no"; this.js=null; //必须设置 this.onMouseOver="onMouseOver"; this.onMouseOut="onMouseOut"; } /** * 设置标签的页面上下文 * @param pageContext */ public void setPageContext(PageContext pageContext) { this.pageContext = pageContext; } /** * 设置上一级标签 * @param t */ public void setParent(Tag parent) { this.parent = parent; } public Tag getParent() { return this.parent; } /** * 开始标签时的操作 * @return * @throws JspException */ public int doStartTag() throws JspException { if(this.blueClass==null){ throw new JspException("树标签blueClass属性未设置！"); } if(this.imageURL==null){ throw new JspException("树标签imageURL属性未设置！"); } if(this.js==null){ throw new JspException("树标签js属性未设置！"); } return this.SKIP_BODY; //返回SKIP_BODY，表示不计算标签体 } /** * 结束标签时的操作 * @return * @throws JspException */ public int doEndTag() throws JspException { JspWriter out = this.pageContext.getOut(); try { String tree = this.createTree(); out.print(tree); } catch (Exception ex) { throw new JspException("创建树错误:" + ex.getMessage()); } return this.EVAL_PAGE; } /** * Release 用于释放标签程序占用的资源，比如使用了数据库连接，那么应该关闭这个连接 */ public void release() { } /** * 构建树 * @return 返回树HTML代码字符串 */ public String createTree() throws Exception { StringBuffer result = new StringBuffer(); BlueTreeFactory treeFactory = new BlueTreeFactory(); BlueTreeInterFace tree = (BlueTreeInterFace) treeFactory.create(this. blueClass); List elements = null; elements = tree.getTreeElements(this.rootId); //样式 result.append("<style>"); result.append(".onMouseOver{"); result.append("background-color:#CCCCCC;"); result.append("}"); result.append(".onMouseOut{"); result.append("}"); result.append("</style>"); //js result.append("<script src=\""); result.append(this.js); result.append("\">"); result.append("</script>"); //开始创建树 result.append("<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" class=\""); result.append(this.styleClass); result.append("\">"); //创建跟节点 result.append("<tr onMouseOver=\"this.className='"); result.append(this.onMouseOver); result.append("'\" onMouseOut=\"this.className='"); result.append(this.onMouseOut); result.append("'\">"); result.append("<td>"); result.append("<a class=\""); result.append(this.linkClass); result.append("\" href=\""); result.append(this.rootURL); result.append("\" target=\""); result.append(this.target); result.append("\">"); result.append("<img align=\"absmiddle\" class=\""); result.append(this.imgClass); result.append("\" src=\""); result.append(this.imageURL); result.append(this.rootImage); result.append("\">"); result.append(this.rootName); result.append("</a>"); result.append("</td>"); result.append("</tr>"); //创建第一级节点 for (int i = 0; i < elements.size(); i++) { BlueTreeData treeData = new BlueTreeData(); treeData = (BlueTreeData) elements.get(i); //加超连接头 //=================================================== result.append("<tr onMouseOver=\"this.className='"); result.append(this.onMouseOver); result.append("'\" onMouseOut=\"this.className='"); result.append(this.onMouseOut); result.append("'\">"); result.append("<td>"); result.append("<a class=\""); result.append(this.linkClass); result.append("\" href=\""); if((treeData.isIschild() && this.isIsFolderURL()) || !treeData.isIschild()){ if(this.isIsUseDataURL()){ result.append(treeData.getUrl()); }else{ result.append(this.blueURL); } //添加节点连接参数 result.append("?"); result.append("node="); result.append(treeData.getId()); }else{ result.append("javascript:void(null);"); } result.append("\" target=\""); result.append(this.target); //添加节点单击事件 //=================================================== if(treeData.isIschild()){ result.append("\" onClick=\"clickTreeNode('"); result.append(treeData.getId()); result.append("',1,'"); result.append(this.styleClass); result.append("','"); result.append(this.imageURL); result.append("','"); result.append(this.imgClass); result.append("','"); result.append(this.lineImg); result.append("','"); result.append(this.end