Java里的权限实现

package com.wepull.mytag; import java.io.IOException; import javax.servlet.jsp.JspException; import javax.servlet.jsp.JspWriter; import javax.servlet.jsp.tagext.TagSupport; public class PaginateTag extends TagSupport{ /** * */ private static final long serialVersionUID = -5649855178067051902L; private String action;// private String firstResult; private String maxSize;//页最大行数 private String total;//结果集的总条数数 private String otherParam;//其他需要加在url后面的参数 @Override public int doEndTag() throws JspException { action = action+"?"; int _firstResult = (firstResult==null||firstResult=="")?0:Integer.parseInt(this.firstResult); int _maxSize = Integer.parseInt(this.maxSize);//格式化成数字 int _total = Integer.parseInt(this.total);//格式化成数字 otherParam = (otherParam!=null)?otherParam:""; int num = _total % _maxSize ==0?_total / _maxSize:(_total / _maxSize)+1; String tempstring = ""; String casestring = "<a style='display:none' id='forPaginate' href="+action + "firstResult=0&maxSize=" +_maxSize+ "&"+ otherParam +" > "+ "临时" +"</a>"; tempstring = (_firstResult > 0)? casestring+"<span> <a id='forPaginate' href="+action + "firstResult=" +(_firstResult-_maxSize)+ "&maxSize=" +_maxSize+ "&"+ otherParam +" > "+ "上一页" +"</a> </span>" : ""+casestring; for(int i=((_firstResult/_maxSize)-10)<0?0:((_firstResult/_maxSize)-10);i<((_firstResult/_maxSize)+10)&&i<num;i++){ //限制最大链接数 if(_firstResult >=i*_maxSize && _firstResult< (i+1)*_maxSize ){ casestring = String.valueOf(i+1); }else{ casestring = "<span> <a name='forPaginate' id='forPaginate' href="+action + "firstResult=" +i*_maxSize+ "&maxSize=" +_maxSize+ "&"+ otherParam +" > "+ (i+1) +"</a> </span>"; } tempstring = tempstring+casestring; } casestring = ((_firstResult+_maxSize) < _total)? "<span> <a id='forPaginate' href="+action + "firstResult=" +(_firstResult+_maxSize)+ "&maxSize=" +_maxSize+ "&"+ otherParam +" > "+ "下一页" +"</a> </span>":""; tempstring = tempstring+casestring; //手动输入跳转 tempstring = tempstring +" <span><input type='text' id='page_num' name='page_num' size='5' maxlength='5' value='"+((_firstResult/_maxSize)+1)+"' /> /" +num + "</span> <INPUT type='hidden' id=maxSize value="+_maxSize+" name=maxSize> <span><input type='button' value='GO' onclick='addPageUrl()'/></span>"; JspWriter out = pageContext.getOut();//获得一个输出对象 try { tempstring = tempstring +"<script>function addPageUrl(){this.location = document.getElementsByName('forPaginate')[0].href.replace('firstResult=0','firstResult='+((document.getElementById('page_num').value-1)*document.getElementById('maxSize').value));}</script>"; out.print(tempstring);//在jsp页面显示 } catch (IOException e) { e.printStackTrace(); } return super.doEndTag(); } public String getAction() { return action; } public void setAction(String action) { this.action = action; } public String getFirstResult() { return firstResult; } public void setFirstResult(String firstResult) { this.firstResult = firstResult; } public String getMaxSize() { return maxSize; } public void setMaxSize(String maxSize) { this.maxSize = maxSize; } public String getTotal() { return total; } public void setTotal(String total) { this.total = total; } public String getOtherParam() { return otherParam; } public void setOtherParam(String otherParam) { this.otherParam = otherParam; } }