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jsp 自定义分页标签

 2007-01-31 16:33:01 来源:WEB开发网   
核心提示:花了一上午简单研究了下自定义标签,就弄了个自定义的分页标签,jsp 自定义分页标签,代码没有怎么仔细优化,先贴上来

花了一上午简单研究了下自定义标签。就弄了个自定义的分页标签。代码没有怎么仔细优化。先贴上来,:)

1,标签的实现类NumenTag.java

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

/** *//**
 * 自定义的分页标签
 *
 * @author 马万林
 *
 */
public class NumenTag extends TagSupport {

   PRivate String url = null;

   private Result result;

   private String page = null;

   private String[] p;

   private Map kv = new HashMap();

   private List key = null;

   /** *//**
   * 分离参数
   * @param params
   */
   public void setParams(String params) {
     key = new ArrayList();
     p = params.split(";");
     for (int i = 0; p.length>1&&i < p.length; i++) {
       kv.put(p[i].split(":")[0], p[i].split(":")[1]);
       key.add(p[i].split(":")[0]);
     }
   }

   /** *//**
   * 分页的结果
   * @param result
   */
   public void setResult(String result) {
     this.result = (Result) pageContext.getRequest().getAttribute("result");
     this.page = (String) pageContext.getRequest().getAttribute("page");
   }

   public void setUrl(String url) {
     this.url = url;
   }

   public int doStartTag() throws JspException {
     StringBuffer sb = null;
     if (result != null && result.getContent() != null
         && result.getContent().size() > 0) {
       sb = new StringBuffer("分页: ");
       if (result.getPage().getHasprePage()){
         sb.append("<a href='").append(url);
         if (url.indexOf("?") == -1)
           sb.append("?page=1");
         else
           sb.append("&page=1");
         linkParams(sb);
         sb.append("'>").append("首页").append("</a>").append(" | ");
         sb.append("<a href='").append(url);
         if (url.indexOf("?") == -1)
           sb.append("?page=").append(
               result.getPage().getPreviousPage());
         else
           sb.append("&page=").append(
               result.getPage().getPreviousPage());
         linkParams(sb);
         sb.append("'>").append("上页").append("</a>").append(" | ");
       }
       if (result.getPage().getHasNextPage()) {
         sb.append("<a href='").append(url);
         if (url.indexOf("?") == -1)
           sb.append("?page=").append(result.getPage().getNextPage());
         else
           sb.append("&page=").append(result.getPage().getNextPage());
         linkParams(sb);
         sb.append("'>").append("下页").append("</a>").append(" | ");
         sb.append("<a href='").append(url);
         if (url.indexOf("?") == -1)
           sb.append("?page=").append(result.getPage().getTotalPage());
         else
           sb.append("&page=").append(result.getPage().getTotalPage());
         linkParams(sb);
         sb.append("'>").append("尾页").append("</a>");
       }
       sb
           .append(" 跳转到:<select name='goToPage' >");
       int s = result.getPage().getTotalCount();
       for (int i = 1; i <= s; i++) {
         sb.append("<option value=").append(i);
         if (Integer.parseInt(page) == i)
           sb.append(" selected");
         sb.append(">第").append(i).append("页</option>");
       }
       sb.append("</select>");
       sb.append("<script language=Javascript>");
       sb.append("function goPage(page){").append("window.location='")
           .append(url);
       if (url.indexOf("?") == -1)
         sb.append("?page='+").append("page");
       else
         sb.append("&page='+").append("page");
       sb.append("+'");
       linkParams(sb);
       sb.append("';");
       sb.append("}");
       sb.append("</script>");
     }
     try {
       if (sb != null) {
         JspWriter out = pageContext.getOut();
         out.print(sb);
       }
     } catch (Exception e) {
       throw new JspException(e);
     }
     return EVAL_PAGE;
   }
  
   /** *//**
   * 链接参数处理
   * @param sb
   */
   private void linkParams(StringBuffer sb) {
     for (int i = 0; i < key.size(); i++) {
       sb.append("&").append(key.get(i)).append("=").append(
           kv.get(key.get(i)));
     }
   }

}
 

2,标签定义文件numentag.tld

<?xml  version="1.0"  encoding="utf-8"  ?>
 <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
   <tlib-version>1.0</tlib-version>
   <jsp-version>1.2</jsp-version>
   <short-name>numen</short-name>
   <!--OutputTag-->
   <tag>
     <name>out</name>
     <tag-class>cn.cityyouth.util.NumenTag</tag-class>
     <body-content>empty</body-content>
     <attribute>
       <name>url</name>
       <required>true</required>
       <rtexprvalue>true</rtexprvalue>
     </attribute>
     <attribute>
       <name>result</name>
       <required>true</required>
       <rtexprvalue>true</rtexprvalue>
     </attribute>
     <attribute>
       <name>params</name>
       <required>false</required>
       <rtexprvalue>true</rtexprvalue>
     </attribute>
   </tag>
</taglib>

3.js

<%@ page contentType="text/html; charset=utf-8"%>
<%@ include file="/common/taglibs.jsp"%>
<%@ taglib  uri="/WEB-INF/numentag.tld"  prefix="n"%>
<html>
<head>
</head>
<body>
<table>
<tr><td>
<n:out url="test.do" result="result" params="${type}"/>
</td></tr>
</table>
</body>
</html>
http://blog.csdn.net/numen_wlm/archive/2007/01/30/1497778.aspx

Tags:jsp 定义 标签

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