jsp 自定義分頁標簽_JSP教程

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花了一上午簡單研究了下自定義標簽。就弄了個自定義的分頁標簽。代碼沒有怎么仔細優化。先貼上來，：）

1,標簽的實現類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;

/** *//**
* 自定義的分頁標簽
*
* @author 馬萬林
*
*/
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;

/** *//**
* 分離參數
* @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]);
}
}

/** *//**
* 分頁的結果
* @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("分頁: ");
if (result.getPage().getHasPrePage()){
sb.append(" if (url.indexOf("?") == -1)
sb.append("?page=1");
else
sb.append("&page=1");
linkParams(sb);
sb.append("'>").append("首頁").append("").append(" | ");
sb.append(" if (url.indexOf("?") == -1)
sb.append("?page=").append(
result.getPage().getPreviousPage());
else
sb.append("&page=").append(
result.getPage().getPreviousPage());
linkParams(sb);
sb.append("'>").append("上頁").append("").append(" | ");
}
if (result.getPage().getHasNextPage()) {
sb.append(" if (url.indexOf("?") == -1)
sb.append("?page=").append(result.getPage().getNextPage());
else
sb.append("&page=").append(result.getPage().getNextPage());
linkParams(sb);
sb.append("'>").append("下頁").append("").append(" | ");
sb.append(" if (url.indexOf("?") == -1)
sb.append("?page=").append(result.getPage().getTotalPage());
else
sb.append("&page=").append(result.getPage().getTotalPage());
linkParams(sb);
sb.append("'>").append("尾頁").append("");
}
sb
.append(" 跳轉到:");
sb.append("");
}
try {
if (sb != null) {
JspWriter out = pageContext.getOut();
out.print(sb);
}
} catch (Exception e) {
throw new JspException(e);
}
return EVAL_PAGE;
}

/** *//**
* 鏈接參數處理
* @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)));
}
}