一、所有的web香茅油都會用到分頁顯示和模糊查詢，對於有些人不知道該怎麼寫

二、今天我用springMVC 和 myBatis 寫的分頁和模糊分享給大家，不喜勿噴

三、資料庫是mysql

四、其實寫分頁就是新建一個分頁的類，定義 頁碼  每頁數量  共幾頁  當前頁數  總數量

五、判斷多少頁，獲取總數量除以每頁顯示的數量，有餘數+1頁

六、sql語句就是用 limit  顯示的數量，把從多少條開始，到顯示幾條傳到sql語句上

七、目前每頁的顯示的數量是定義好的，等過兩天有時間把自己可以選擇顯示頁數的程式碼寫出來

使用者實體類

public class User {
	
	private int id;
	private String name;
	private String sex;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
}

分頁的實體類

public class Page {
	/**
	 * 頁碼
	 */
	private int pageNum;
	/**
	 * 每頁顯示的行數
	 */
	private int pageRows;
	/**
	 * 總行數
	 */
	private int totalRows;
	/**
	 * 總頁數
	 */
	private int totalPages;
	/**
	 * 起始行號
	 */
	private int beginRownum;
	/**
	 * 結束行號
	 */
	private int endRownum;

	public Page(int pageNum, int pageRows, int totalRows) {
		this.pageNum = pageNum;
		this.pageRows = pageRows;
		this.totalRows = totalRows;
		// 計算總頁數:總行數%每頁行數==0?總行數/每頁行數:總行數/每頁行數+1
		this.totalPages = totalRows % pageRows == 0 ? totalRows / pageRows : (totalRows / pageRows) + 1;
		beginRownum = (pageNum - 1) * pageRows;
		endRownum = pageNum * pageRows;
	}

	public int getPageNum() {
		return pageNum;
	}

	public void setPageNum(int pageNum) {
		this.pageNum = pageNum;
	}

	public int getPageRows() {
		return pageRows;
	}

	public void setPageRows(int pageRows) {
		this.pageRows = pageRows;
	}

	public int getTotalRows() {
		return totalRows;
	}

	public void setTotalRows(int totalRows) {
		this.totalRows = totalRows;
	}

	public int getTotalPages() {
		return totalPages;
	}

	public void setTotalPages(int totalPages) {
		this.totalPages = totalPages;
	}

	public int getBeginRownum() {
		return beginRownum;
	}

	public void setBeginRownum(int beginRownum) {
		this.beginRownum = beginRownum;
	}

	public int getEndRownum() {
		return endRownum;
	}

	public void setEndRownum(int endRownum) {
		this.endRownum = endRownum;
	}
	
}
 

mapper  和  對映檔案

public interface UserMapper {
	
	public List<User> selectAll(Map<String,Object> map);
	
	//查詢總行數
	public int selTotalRows(Map<String,Object> map);
}

<mapper namespace="com.mapper.UserMapper">

	<select id="selectAll" resultType="com.entity.User">
		select * from user 
		<where>
			<if test="name != null and name != ''">
				and name like #{name}
			</if>
			<if test="sex != null and sex != ''">
				and sex = #{sex}
			</if>
		</where>
		limit #{page.beginRownum},5
	</select>
	
	<!-- 查詢總行數 -->
	<select id="selTotalRows" resultType="int">
		select count(id) from user
		<where>
			<if test="name != null and name != ''">
				and name like #{name}
			</if>
			<if test="sex != null and sex != ''">
				and sex = #{sex}
			</if>
		</where>
	</select>

</mapper>
 

控制層

public class UserController {

		@Autowired
		private UserService userService;

		@RequestMapping("/showAll.action")
		public String selAll(HttpServletRequest request){
			Map<String,Object> map = new HashMap<String, Object>();	
			map.put("name", null);
			map.put("sex", null);
			Page page = new Page(1,5,userService.selTotalRows(map));
			map.put("page", page);
			List<User> userList = userService.selectAll(map);
			request.setAttribute("userList", userList);
			request.setAttribute("page", page);
			return "two.jsp";
		}
		
		
		//查詢所有使用者（帶模糊查詢、分頁）
		@RequestMapping("/showPage.action")
		public String selAllLikePage(int pageNum,String name,String sex,HttpServletRequest request){
			Map<String,Object> map = new HashMap<String, Object>();
			if("".equals(name)){
				map.put("name", null);
			}else{
				map.put("name", "%"+name+"%");
			}
			if("".equals(sex)){
				map.put("sex", null);
			}else{
				map.put("sex", sex);
			}
			Page page = new Page(pageNum,5,userService.selTotalRows(map));
			map.put("page", page);
			List<User> userList = userService.selectAll(map);
			request.setAttribute("userList",userList);
			request.setAttribute("page", page);
			request.setAttribute("name", name);
			request.setAttribute("sex", sex);
			return "two.jsp";
		}
}
 

jsp頁面

<body>
	<div>
		<form action="showPage.action?pageNum=1" method="post">
			<span>
				姓名：<input name="name" value="${name }" />   
				性別：<input name="sex" value="${sex }" />  
				<input type="submit" value="查詢" /> 
			</span>
		</form>
	</div>
	<br><br>
	<div>
		<table width="500" border="1" cellspacing="0" cellpadding="0">
			<tr>
				<th width="100px">序號</th>
				<th width="200px">姓名</th>
				<th width="200px">性別</th>
			</tr>
			<c:forEach items="${userList }" var="user">
				<tr>
					<td>${user.id }</td>
					<td>${user.name }</td>
					<td>${user.sex }</td>
				</tr>
			</c:forEach>
			<tr>
				<td class="scott" colspan="20" style="text-align: center;">
					 <c:if test="${page.pageNum > 1 }">
                       	<a href="showPage.action?name=${name }&sex=${sex }&pageNum=1">首頁</a>
						<a href="showPage.action?name=${name }&sex=${sex }&pageNum=${page.pageNum - 1 }">上一頁</a>
					</c:if>
					<c:forEach begin="1" end="${page.totalPages}" step="1" var="num">
						<c:if test="${page.pageNum == num }">${num }</c:if>
						<c:if test="${page.pageNum != num }">
							<a href="showPage.action?name=${name }&sex${sex }&pageNum=${num }">${num }</a>
						</c:if>
					</c:forEach>
					<c:if test="${page.pageNum < page.totalPages }">
						<a href="showPage.action?name=${name }&sex=${sex }&pageNum=${page.pageNum + 1 }">下一頁</a>
						<a href="showPage.action?name=${name }&sex=${sex }&pageNum=${page.totalPages }">尾頁</a>
					</c:if>
					總${page.pageNum}/${page.totalPages }頁
				</td>
			</tr>
		</table>
		
	</div>
</body>