struts2数字版海量分页

package com.aptech.restrant.tag; import java.io.IOException; import java.io.Writer; import java.util.Map; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.http.HttpServletRequest; import org.apache.struts2.StrutsStatics; import org.apache.struts2.components.Component; import org.apache.struts2.dispatcher.StrutsRequestWrapper; import com.opensymphony.xwork2.util.ValueStack; /** * 分页逻辑Bean * @author tangs */ public class Pages extends Component { private HttpServletRequest request; private String pageNo; private String total; private String styleClass; private String theme; private String includes; public String getTheme() { return theme; } public void setTheme(String theme) { this.theme = theme; } public String getIncludes() { return includes; } public void setIncludes(String includes) { this.includes = includes; } public String getStyleClass() { return styleClass; } public void setStyleClass(String styleClass) { this.styleClass = styleClass; } public String getPageNo() { return pageNo; } public void setPageNo(String pageNo) { this.pageNo = pageNo; } public String getTotal() { return total; } public void setTotal(String total) { this.total = total; } public Pages(ValueStack arg0, HttpServletRequest request) { super(arg0); this.request = request; } @Override public boolean start(Writer writer) { boolean result = super.start(writer); try { StringBuilder str = new StringBuilder(); Map cont=this.getStack().getContext(); StrutsRequestWrapper req=(StrutsRequestWrapper)cont.get(StrutsStatics.HTTP_REQUEST); String url=(String)req.getAttribute("javax.servlet.forward.request_uri"); //从ValueStack中取出数值 Object obj=this.getStack().findValue(pageNo); pageNo = String.valueOf((Integer)obj); obj=this.getStack().findValue(total); total = String.valueOf((Integer)obj); StringBuffer perUrl=new StringBuffer(""); if(includes!=null){ String[] perm=includes.split(","); for(int i=0;i<perm.length;i++){ String permName=perm[i]; Object obje=this.getStack().findValue(permName); String vType=obje.getClass().toString(); vType=vType.substring(vType.lastIndexOf(".")+1,vType.length()); perUrl.append("&"+permName); if(vType.equals("String")){ String tmp= (String)this.getStack().findValue(permName); perUrl.append("="+tmp); }else if(vType.equals("Long")){ Long tmp= (Long)this.getStack().findValue(permName); perUrl.append("="+tmp); }else if(vType.equals("Float")){ Float tmp= (Float)this.getStack().findValue(permName); perUrl.append("="+tmp); }else if(vType.equals("Integer")){ Integer tmp= (Integer)this.getStack().findValue(permName); perUrl.append("="+tmp); }else if(vType.equals("Boolean")){ Boolean tmp= (Boolean)this.getStack().findValue(permName); perUrl.append("="+tmp); } } } Integer cpageInt = Integer.valueOf(pageNo); str.append("<span "); if (styleClass != null) { str.append(" class='"+styleClass+"'>"); } else { str.append(">"); } //文本样式 if (theme == null || "text".equals(theme)) { //当前页与总页数相等 if (pageNo.equals(total)) { //如果total = 1，则无需分页，显示“[第1页] [共1页]” if ("1".equals(total)) { str.append("[第 " + pageNo + " 页]"); str.append(" [共 " + total + " 页]"); } else { //到达最后一页,显示“[首页] [上一页] [末页]” str.append("<a href='"+url+"?pageNo=1"+perUrl+"'>[首页]</a> "); str.append("<a href='"+url+"?pageNo=" + (cpageInt - 1)+perUrl+"'>[上一页]</a>" ); str.append(" <a href='"+url+"?pageNo=" + total+perUrl+"'>[末页]</a> "); } } else { //当前页与总页数不相同 if ("1".equals(pageNo)) { //第一页，显示“[首页] [下一页] [末页]” str.append("<a href='"+url+"?pageNo=1"+perUrl+"'>[首页]</a>"); str.append("<a href='"+url+"?pageNo=" + (cpageInt + 1) +perUrl+"'>[下一页]</a>"); str.append("<a href='"+url+"?pageNo=" + total +perUrl+"'>[末页]</a>"); } else { //不是第一页，显示“[首页] [上一页] [下一页] [末页]” str.append("<a href='"+url+"?pageNo=1"+perUrl+"'>[首页]</a>"); str.append("<a href='"+url+"?pageNo=" + (cpageInt - 1)+perUrl+"'>[上一页]</a>"); str.append("<a href='"+url+"?pageNo=" + (cpageInt + 1)+perUrl+"'>[下一页]</a>"); str.append("<a href='"+url+"?pageNo=" + total +perUrl+"'>[末页]</a>"); } } } else if ("number".equals(theme)) { //数字样式 [1 2 3 4 5 6 7 8 9 10 > >>] Integer totalInt = Integer.valueOf(total); //如果只有一页，则无需分页 str.append("[ "); if (totalInt == 1) { str.append("<strong>1</strong> "); } else { if (cpageInt > 1) { //当前不是第一组，要显示“<< <” //<<：返回前一组第一页 //<：返回前一页 str.append("<a href='"+url+"?pageNo=1"+perUrl+"'>«</a> "); str.append("<a href='"+url+"?pageNo=" + (cpageInt - 1)+perUrl); str.append("'>‹</a> " ); }else{ str.append("« ‹ " ); } int v=(cpageInt-4)>0?(cpageInt-4):1; int v1=(cpageInt+4)<totalInt?(cpageInt+4):totalInt; if(v1==totalInt){ v=totalInt-10; v= v<=0 ? 1: v; //prevent v would be negative }else if(v==1&&v1<