憨厚生

在工作中需要一個翻頁效果，所以寫下了如下方法。實現了常用的翻頁效果，但代碼還沒有進行優化（缺點：不適合數據量大的情況，因為所有的記錄存在一個Vector變量中）貼出來供需要著參考一下！
import java.util.*;

public class Pages {
?int allRows;//所有的行數
?int currRow;//當前是第幾行
?int onePageRows;//一頁顯示多少行
?int allPages;//所有的頁數
?int currPage= 1;
?boolean firstPage= false;
?boolean lastPage= false;

?public Pages(int onePageRows) {
??this.onePageRows= onePageRows;
?}
/*
?? vector1 為所有的記錄
*/

?public Vector downPage(Vector vector1, int currPage) {
??Vector vector= new Vector();
??this.currPage= currPage;
??this.allRows= vector1.size();
??this.currRow= currPage * (this.onePageRows);
??int j= this.allRows % this.onePageRows;
??this.allPages= (this.allRows / this.onePageRows) + (j == 0 ? 0 : 1);
??this.currPage++;
??if (this.currPage < this.allPages) {
???this.lastPage= true;
??} else {
???this.lastPage= false;
??}
??this.firstPage= true;
??int i= 0;
??for (i= 0; i < this.onePageRows && currPage * this.onePageRows + i < this.allRows; i++) {
???vector.add(i, vector1.get(currRow + i));
??}
??this.currRow= this.currRow + i;
??return vector;
?}

?public Vector upPage(Vector vector1, int currPage) {
??Vector vector= new Vector();
??this.currPage= currPage;
??this.allRows= vector1.size();
??this.currRow= (currPage - 2) * (this.onePageRows);
??int j= this.allRows % this.onePageRows;
??this.allPages= (this.allRows / this.onePageRows) + (j == 0 ? 0 : 1);
??this.currPage--;
??if (this.currPage > 1) {
???this.firstPage= true;
??} else {
???this.firstPage= false;
??}
??this.lastPage= true;
??for (int i= 0; i < this.onePageRows; i++) {
???vector.add(i, vector1.get(this.currRow + i));
??}
??return vector;
?}
?public Vector firstPage(Vector vector1) {
??Vector vector= new Vector();
??this.allRows= vector1.size();
??this.currRow= this.onePageRows;
??int j= this.allRows % this.onePageRows;
??this.allPages= (this.allRows / this.onePageRows) + (j == 0 ? 0 : 1);
??this.firstPage= false;
??if (allPages > 1)
???this.lastPage= true;
??for (int i= 0; i < this.onePageRows && i < vector1.size(); i++) {
???vector.add(i, vector1.get(i));
??}
??return vector;
?}
?public Vector lastPage(Vector vector1) {
??Vector vector= new Vector();
??this.allRows= vector1.size();
??int j= this.allRows % this.onePageRows;
??this.allPages= (this.allRows / this.onePageRows) + (j == 0 ? 0 : 1);
??this.currPage= this.allPages;
??this.lastPage= false;
??if (allPages > 1)
???this.firstPage= true;
??int m= j == 0 ? this.onePageRows : this.allRows - (this.allPages - 1) * this.onePageRows;
??int n= m;
??for (int i= 0; i < m; i++) {
???vector.add(i, vector1.get(this.allRows - n));
???n--;
??}
??return vector;
?}

?public String getToolBar() {
??String form= "<form? id=\"form\" method=\"post\">";
??String table1= "<table align=\"center\" width=\"70%\"><tr><td>";
??String button1= "<input type=\"button\" value=\"首頁\" onClick=\"dealPage();\" id=\"firstPage\" />&nbsp;";
??String disabled= "disabled=";
??if (!this.firstPage)
???disabled= disabled + "disabled";
??else
???disabled= "";
??String button2= "<input type=\"button\" value=\"上頁\" id=\"upPage\" onClick=\"dealPage();\" " + disabled + " />&nbsp;";
??if (!this.lastPage)
???disabled= disabled + "disabled";
??else
???disabled= "";
??String button3= "<input type=\"button\" value=\"下頁\" id=\"downPage\" onClick=\"dealPage();\" " + disabled + " />&nbsp;";
??String button4= "<input type=\"button\" value=\"尾頁\"? id=\"lastPage\" onClick=\"dealPage();\"/>";
??String table2= "</td></tr><tr><td align=\"center\">";
??String table3= "共" + this.allRows + "行/第" + this.currPage + "頁/共" + this.allPages + "頁</td></tr></table></form>";
??String result= form + table1 + button1 + button2 + button3 + button4 + table2 + table3;
??return result;
?}
?
?public String getJavaScript() {
??StringBuffer result= new StringBuffer();
??if (this.getAllRows() > this.getOnePageRows()) {
???result.append("<SCRIPT language=JavaScript>");
???result.append("function dealPage(){");
???result.append("document.all.form.action=\"/mydomain/javaoa/selectqh.do?method=\"+event.srcElement.id+\"&currPage=");
???result.append(this.getCurrPage() + "&onePageRows=" + this.getOnePageRows() + "\";");
???result.append("document.all.form.submit();");
???result.append("}");
???result.append("</SCRIPT>");
??}
??return result.toString();
?}
?//?public static void main(String[] args) {
?//??Pages page= new Pages(5);
?//??Vector vector= new Vector();
?//??Vector vector1= new Vector();
?//??for (int i= 0; i < 7; i++) {
?//???vector.add(i, new String(new Integer(i).toString()));
?//??}
?//??vector1= page.upPage(vector, 2);
?//??String s= page.getJavaScript();
?//??System.out.println("==" + s);
?//?????for (int i= 0; i < vector1.size(); i++) {
?//??????System.out.println(i + "=" + vector1.get(i));
?//?????}
?//?????System.out.println("allRows=" + page.allRows);
?//?????System.out.println("currRow=" + page.currRow);
?//?????System.out.println("onePageRows=" + page.onePageRows);
?//?????System.out.println("allPages=" + page.allPages);
?//?????System.out.println("currPage=" + page.currPage);
?//?????System.out.println("firstPage=" + page.firstPage);
?//?????System.out.println("lastPage=" + page.lastPage);
?//?}
?/**
? * @return
? */
?public int getAllPages() {
??return allPages;
?}

?/**
? * @return
? */
?public int getAllRows() {
??return allRows;
?}

?/**
? * @return
? */
?public int getCurrPage() {
??return currPage;
?}

?/**
? * @return
? */
?public int getCurrRow() {
??return currRow;
?}

?/**
? * @return
? */
?public boolean isFirstPage() {
??return firstPage;
?}

?/**
? * @return
? */
?public boolean isLastPage() {
??return lastPage;
?}

?/**
? * @return
? */
?public int getOnePageRows() {
??return onePageRows;
?}

}