新闻列表的分页查询java代码实现

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>
  <%
    }
  %>
     
  <!-- 当跳转到第一页时不再显示“上一页”提交对话框，下同 -->
  <%
    if (!bLast) {
  %>
  <a href="test.jsp?page=<%=ipage + 1%>&totopage=11">下一页</a>
  <%
    }
  %>第<%=ipage%>页   共<%=iTitlePages%>页
</body>
</html>

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