我們?cè)陂_發(fā)過程中數(shù)據(jù)分頁是必不可少的，但是由于數(shù)據(jù)量太大，因此我們不得不進(jìn)行處理，而分頁的方式有很多，我們應(yīng)該如何選擇呢？現(xiàn)在我們就去看看jsp分頁的實(shí)現(xiàn)方法。
分頁的實(shí)現(xiàn)方式我們可以使用sql語句的limit，或者使用jquery的插件。但是底層的邏輯，都是需要的。
在這里貼出bean對(duì)象的代碼，以及一個(gè)輔助類。我做的這個(gè)項(xiàng)目是一個(gè)個(gè)人博客，算是個(gè)人網(wǎng)站吧。
(只貼部分底層邏輯代碼)
Page.java
package cn.edu.ldu.util;public class Page { private int everyPage; //每頁顯示的數(shù)量 private int totalPage; //總頁數(shù) private int totalCount; //總數(shù)量 private int currentPage; //當(dāng)前頁 private int beginIndex; //起始頁 private boolean hasPrepage; //是否有上一頁 private boolean hasNextPage; //是否有下一頁 public Page() { } public Page(int everyPage, int totalPage, int totalCount, int currentPage,int beginIndex, boolean hasPrepage, boolean hasNextPage) { this.everyPage = everyPage; this.totalPage = totalPage; this.totalCount = totalCount; this.currentPage = currentPage; this.beginIndex = beginIndex; this.hasPrepage = hasPrepage; this.hasNextPage = hasNextPage; } public int getEveryPage() { return everyPage; } public void setEveryPage(int everyPage) { this.everyPage = everyPage; } public int getTotalPage() { return totalPage; } public void setTotalPage(int totalPage) { this.totalPage = totalPage; } public int getTotalCount() { return totalCount; } public void setTotalCount(int totalCount) { this.totalCount = totalCount; } public int getCurrentPage() { return currentPage; } public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } public int getBeginIndex() { return beginIndex; } public void setBeginIndex(int beginIndex) { this.beginIndex = beginIndex; } public boolean isHasPrepage() { return hasPrepage; } public void setHasPrepage(boolean hasPrepage) { this.hasPrepage = hasPrepage; } public boolean isHasNextPage() { return hasNextPage; } public void setHasNextPage(boolean hasNextPage) { this.hasNextPage = hasNextPage; }}PageUtil.java
package cn.edu.ldu.util;public class PageUtil { //創(chuàng)建分頁信息對(duì)象 public static Page createPage(int everyPage,int totalCount,int currentPage) { everyPage = getEveryPage(everyPage); currentPage = getCurrentPage(currentPage); int totalPage = getTotalPage(everyPage, totalCount); int beginIndex = getBeginIndex(everyPage, currentPage); boolean hasPrePage = getHasPrePage(currentPage); boolean hasNextPage = getHasNextPage(totalPage, currentPage); return new Page(everyPage, totalPage,totalCount, currentPage, beginIndex, hasPrePage, hasNextPage); } //獲得每頁顯示記錄數(shù) public static int getEveryPage(int everyPage) { return everyPage == 0 ? 10 : everyPage; } //獲得當(dāng)前頁 public static int getCurrentPage(int currentPage) { return currentPage == 0 ? 10 : currentPage; } //獲得總頁數(shù) public static int getTotalPage(int everyPage,int totalCount) { int totalPage=0; //要判斷每頁是否滿頁，否則頁數(shù)+1 if(totalCount!=0 && totalCount%everyPage==0) { totalPage=totalCount/everyPage; } else { totalPage=totalCount/everyPage+1; } return totalPage; } //獲得起始位置 public static int getBeginIndex(int everyPage,int currentPage) { return everyPage*(currentPage-1); } //判斷是否有上一頁 public static boolean getHasPrePage(int currentPage) { return currentPage== 1 ? false : true; } //判斷是否有下一頁 public static boolean getHasNextPage(int totalPage, int currentPage) { return (currentPage == totalPage) || (totalPage == 0) ? false : true; }}每次我只需要去調(diào)用即可。
//傳入每頁顯示的頁數(shù)，總記錄數(shù)，當(dāng)前頁P(yáng)age page=PageUtil.createPage(5, diaryDao.findAllCount(), currentPage);
以上就是jsp分頁的實(shí)現(xiàn)方法，具有一定的參考和學(xué)習(xí)JSP的價(jià)值，對(duì)JSP感興趣的小伙伴們可以參考一下本篇文章。
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