新闻列表的分页查询java代码实现

2020-06-04 11:23梦牵绕了谁的灵魂 JAVA教程

这篇文章主要为大家详细介绍了新闻列表的分页查询java代码实现，感兴趣的小伙伴们可以参考一下

本文实例为大家分享了新闻列表分页查询的java代码，供大家参考，具体内容如下

package com.ibeifeng.test;

//创建新闻测试类

public class newTest {

private long id;

private String title;

private String content;

private String author;



public newTest() {

  super();

}



public newTest(long id, String title, String content, String author) {

  this.id = id;

  this.title = title;

  this.content = content;

  this.author = author;

}



public long getId() {

  return id;

}



public void setId(long id) {

  this.id = id;

}



public String getTitle() {

  return title;

}



public void setTitle(String title) {

  this.title = title;

}



public String getContent() {

  return content;

}



public void setContent(String content) {

  this.content = content;

}



public String getAuthor() {

  return author;

}



public void setAuthor(String author) {

  this.author = author;

}



@Override

public String toString() {

  return "newTest [id=" + id + ", title=" + title + ", content=" + content

      + ", author=" + author + "]";

}





}

2.开始查询

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ page import="com.ibeifeng.test.newTest"%>

<%

  String path = request.getContextPath();

  String basePath = request.getScheme() + "://"

      + request.getServerName() + ":" + request.getServerPort()

      + path + "/";

%>

<%

  List<newTest> list = new ArrayList<newTest>(107);//设定新闻行数为107行

  for (int i = 1; i <= 107; i++) {//list中添加新闻

    newTest news = new newTest(0L + i, i + "里约奥运", "马龙获得金牌-世界乒坛第五位男子“大满贯”得主", "福音");



    list.add(news);

  }//end of for...添加107条数据到集合中

    //int pageIndex=10;

  int iTitleIndex = list.size();//获取集合下表标

  int iTitlePages = iTitleIndex / 10

      + (iTitleIndex % 10 == 0 ? 0 : 1);//获取页数的总数

  int ipage = 4;//开始的页数



  String str = request.getParameter("page");

  if (str != null && !str.trim().equals("")) {

    int newPage = Integer.valueOf(str);



    if (newPage < 1) {

      ipage = 1;

    } else if (newPage > iTitlePages) {

      ipage = iTitlePages;

    } else {

      ipage = newPage;

    }

  }

  //创建一个新的集合（大小每个页面显示的新闻总数）将107条数据分别存储到其中

  List<newTest> listPage = new ArrayList<newTest>(10);

  int ipa = 10;//获取循环体的循环次数//最后一页只有七条数据

  if (ipage == iTitlePages) { //当当前页数为最后一页时，剩余几行则循环体之执行剩余的行的数次，

    ipa = list.size() - (iTitlePages - 1) * 10;

  }

  for (int i = 0; i < ipa; i++) { //i=0;获取前十个数据第一次循环时ipage=4

    newTest arr = list.get(i + (ipage - 1) * 10);

    listPage.add(arr);

  }

%>

<html>

<body>

  <table>

    <tr>

      <th>标题</th>

      <td>作者</td>

      <td>摘要</td>

    </tr>

    <%

      for (int i = 0; i < listPage.size(); i++) { //java代码需要用<% %》保护起来否则会被当做web语句执行

        newTest temp = listPage.get(i);

    %>

    <tr>

      <td><%=temp.getTitle()%></td>

      <td><%=temp.getAuthor()%></td>

      <td><%=temp.getContent()%></td>

    </tr>

    <%

      }//end of for...

    %>

  </table>



  <%

    boolean bFirst = ipage == 1;

    boolean bLast = ipage == iTitlePages ;

  %>



  <%

    if (!bFirst) {

  %>

  <a href="test.jsp?page=<%=ipage - 1%>&totopage=11">上一页</a>

  <%

    }

  %>

     

  

  <%

    if (!bLast) {

  %>

  <a href="test.jsp?page=<%=ipage + 1%>&totopage=11">下一页</a>

  <%

    }

  %>第<%=ipage%>页   共<%=iTitlePages%>页

</body>

</html>