tag开发实例源代码

tag开发实例源代码

已经测试过


参考：

http://java.sun.com/products/jsp/tutorial/TagLibrariesTOC.html

/**
 * 2009-5-6
 * zhenjw
 */
package zhenjw;

import java.io.IOException;

import javax.servlet.jsp.JspException;

//tag 关键是要继承这个类
import javax.servlet.jsp.tagext.TagSupport;

/**
 * @author zhenjw
 *
 */
public class TurnPageTag extends TagSupport {
	
	private int totalRow;
	private int pageSize;
	private int pageNo;
	private String onclick;
	
	private String FirstPage="首页";
	private String PrePage="上一页";
	private String NextPage="下一页";
	private String LastPage="尾页";
	/**
	 * @return the onclick
	 */
	public String getOnclick() {
		return onclick;
	}
	/**
	 * @param onclick the onclick to set
	 */
	public void setOnclick(String onclick) {
		this.onclick = onclick;
	}
	/**
	 * @return the pageNo
	 */
	public int getPageNo() {
		return pageNo;
	}
	/**
	 * @param pageNo the pageNo to set
	 */
	public void setPageNo(int pageNo) {
		this.pageNo = pageNo;
	}
	/**
	 * @return the pageSize
	 */
	public int getPageSize() {
		return pageSize;
	}
	/**
	 * @param pageSize the pageSize to set
	 */
	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}
	/**
	 * @return the totalRow
	 */
	public int getTotalRow() {
		return totalRow;
	}
	/**
	 * @param totalRow the totalRow to set
	 */
	public void setTotalRow(int totalRow) {
		this.totalRow = totalRow;
	}
	/* (non-Javadoc)
	 * @see javax.servlet.jsp.tagext.TagSupport#doStartTag()
	 */
	public int doStartTag() throws JspException {
		// TODO Auto-generated method stub
		
		StringBuilder strB=new StringBuilder();
		
		//首页 上一页
		if(pageNo>1)
		
			strB.append("<a href='#' onclick='").append(onclick).append("(1);return false;'>").append(this.FirstPage).append("</a>").append("&nbsp;&nbsp;&nbsp;&nbsp;")
			
				.append("<a href='#' onclick='").append(onclick).append("(").append(pageNo-1).append(");return false;'>").append(this.PrePage).append("</a>");
		
		else
			strB.append(this.FirstPage).append("&nbsp;&nbsp;&nbsp;&nbsp;").append(this.PrePage);
		
		strB.append("&nbsp;&nbsp;&nbsp;&nbsp;");
		
		
		// 
		
		int totalPage=this.getTotalPage();
		
		//下一页 尾页
		if(pageNo<totalPage)
			
			strB.append("<a href='#' onclick='").append(onclick).append("(").append(pageNo+1).append(");return false;'>")
				.append(this.NextPage).append("</a>")
				.append("&nbsp;&nbsp;&nbsp;&nbsp;")
				.append("<a href='#' onclick='").append(onclick).append("(").append(totalPage).append(");return false;'>")
				.append(this.LastPage).append("</a>");
			
		else
			
			strB.append(this.NextPage)
				.append("&nbsp;&nbsp;&nbsp;&nbsp;")
				.append(this.LastPage);
		
		strB.append("&nbsp;&nbsp;&nbsp;&nbsp;");
		 
		try {
			
			this.pageContext.getOut().write(strB.toString());
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			
			e.printStackTrace();
			
			throw new JspException(e);
			
		}
		
		return super.doStartTag();
	}
	
	private int getTotalPage()
	{
		return (this.totalRow+this.pageSize-1)/this.pageSize;
		
	}
	
	
	

}

JSP文件
<%@ taglib uri="/tlt" prefix="tlt" %>

web.xml文件

<servlet>
<servlet-mapping>
   <servlet-name>dispatcher</servlet-name>
   <url-pattern>/example/*</url-pattern>
</servlet-mapping>
   <servlet-name>dispatcher</servlet-name>
   <servlet-class>Dispatcher</servlet-class>
</servlet>
<taglib>
   <taglib-uri>/tlt</taglib-uri> 
   <taglib-location>/WEB-INF/taglib.tld</taglib-location> 
</taglib>