简易java分页标签

最新推荐文章于 2023-03-03 20:03:56 发布

原创最新推荐文章于 2023-03-03 20:03:56 发布 · 128 阅读

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简易java分页标签

1,标签的实现类NumenTag.java

java 代码

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' onchange='javascript:goPage(this.value)'》");
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 代码

<?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>
<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>