SSH自定义分页标签

2023-08-27 18:36:52

本文参考文章：http://blog.csdn.net/qjyong/article/details/3240303

一、标签处理类：

package cn.conris.sys.form;

import java.io.IOException;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.TagSupport;

import cn.conris.sys.utils.PropertyUtil;

public class PageTag  extends TagSupport {

         /**

          * 版本

          */

        private static final long serialVersionUID = 1L;

        private int pageSize = PropertyUtil.getPageSize(); // 每页要显示的记录数

        private int pageNo = PropertyUtil.getPageNumber(); // 页号

        private int recordCount; // 总记录数

        private String url; // 目的地URL

        public void setPageSize(int pageSize) {

            this.pageSize = pageSize;

        }

        public void setPageNo(int pageNo) {

            this.pageNo = pageNo;

        }

        public void setRecordCount(int recordCount) {

            this.recordCount = recordCount;

        }

        public void setUrl(String url) {

            this.url = url;

        }

        // 主要的逻辑

        @Override

        public int doStartTag() throws JspException {

            if(recordCount == 0){

                return super.doStartTag();

            }

            // 总页数

            int pageCount = (recordCount + pageSize - 1) / pageSize;

            // 页号越界处理

            if (pageNo > pageCount) {

                pageNo = pageCount;

            }

            if (pageNo < 1) {

                pageNo = 1;

            }

            StringBuilder sb = new StringBuilder();

            sb.append("<form name='pageController' id='pageController' action='' method='post'>&nbsp")

              .append("<input type='hidden' id='pageNo' name='pageNo' value='" + pageNo + "' />&nbsp");

            //------------------------------------ 获取所有請求中的参数

            HttpServletRequest request = (HttpServletRequest) pageContext

                    .getRequest();

            Enumeration<String> enumeration = request.getParameterNames();

            String name = null;

            String value = null;

            //把请求中的所有参数当作隐藏表单域在页面中写出)

            while (enumeration.hasMoreElements()) {

                name =  enumeration.nextElement();

                value = request.getParameter(name);

                // 去除页号

                if (name.equals("pageNo")) {

                    if (null != value && !"".equals(value)) {

                        pageNo = Integer.parseInt(value);

                    }

                    continue;

                }

                sb.append("<input type='hidden' name='")

                  .append(name)

                  .append("' value='")

                  .append(value)

                  .append("'/>&nbsp");

            }

            //----------------------------------------------------

            sb.append(" 共" + pageCount + "页&nbsp&nbsp")

              .append("当前第" + pageNo + "页 &nbsp&nbsp")

              .append("共" + recordCount + "条 &nbsp&nbsp");

            if (pageNo == 1) {

                sb.append("首页");

                sb.append(" ");

                sb.append("上一页&nbsp");

            } else {

                sb.append("<a href='#' onclick='turnOverPage(1)'>首页</a>&nbsp");

                sb.append(" ");

                sb.append("<a href='#' onclick='turnOverPage(")

                        .append((pageNo - 1)).append(")'>上一页</a>&nbsp");

            }

            sb.append(" ");

            if (pageNo == pageCount) {

                sb.append("下一页");

                sb.append(" ");

                sb.append("尾页&nbsp");

            } else {

                sb.append("<a href='#' onclick='turnOverPage(")

                        .append((pageNo + 1)).append(")'>下一页</a>&nbsp");

                sb.append(" ");

                sb.append("<a href='#' onclick='turnOverPage(").append(pageCount)

                        .append(")'>尾页</a>&nbsp");

            }

            sb.append(" 跳到<select style='width:80px;' onChange='turnOverPage(this.value)'>&nbsp");

            for (int i = 1; i <= pageCount; i++) {

                if (i == pageNo) {

                    sb.append("  <option  value='")

                      .append(i)

                      .append("' selected='selected'>第")

                      .append(i)

                      .append("页</option>&nbsp");

                } else {

                    sb.append("  <option  value='")

                      .append(i)

                      .append("'>第")

                      .append(i)

                      .append("页</option>&nbsp");

                }

            }

            sb.append("</select>&nbsp");

            sb.append(" &nbsp");

            sb.append("</form>&nbsp");

            // 生成提交表单的JS

            sb.append("<script language='javascript'>");

           // sb.append("  //翻页函数/t/n");

            sb.append("  function turnOverPage(no){");

            sb.append("    var form = document.pageController;");

           // sb.append("    //页号越界处理");

            sb.append("    if(no").append(">").append(pageCount).append(") {");

            sb.append("        no=").append(pageCount).append(";");

            sb.append("    }");

            sb.append("    if(no").append("< 1){");

            sb.append("        no=1;");

            sb.append("    }");

            sb.append("    form.").append("pageNo").append(".value=no;");

            sb.append("    form.action='").append(url).append("';");

            sb.append("    form.submit();");

            sb.append("  }");

            sb.append("</script>");

            try {

                pageContext.getOut().println(sb.toString());

            } catch (IOException e) {

                e.printStackTrace();

            }

            return super.doStartTag();

        }

}

二、标签库描述文件：

<?xml version="1.0" encoding="UTF-8"?>

<taglib version="2.0" xmlns="http://java.sun.com/xml/ns/j2ee"

 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd">

 <tlib-version>2.0</tlib-version>

 <short-name>my</short-name>

 <uri>http://conris/ModelSystem</uri>

 <tag>

    <description>通用分页标签</description>

    <name>pager</name>

    <tag-class>cn.conris.sys.form.PageTag</tag-class>

    <body-content>empty</body-content>

    <attribute>

      <name>pageNo</name>

      <required>true</required>

      <rtexprvalue>true</rtexprvalue>

    </attribute>

    <attribute>

      <name>recordCount</name>

      <required>true</required>

      <rtexprvalue>true</rtexprvalue>

    </attribute>

    <attribute>

      <name>pageSize</name>

      <required>true</required>

      <rtexprvalue>true</rtexprvalue>

    </attribute>

    <attribute>

      <name>url</name>

      <required>true</required>

      <rtexprvalue>true</rtexprvalue>

    </attribute>

  </tag>

</taglib>

三、PropertyUtil工具类：

package cn.conris.sys.utils;

import java.io.IOException;

import java.io.InputStream;

import java.util.Properties;

public class PropertyUtil {

    private static Properties p = new Properties();

    private static InputStream inputStream = null;

    static {

        inputStream = PropertyUtil.class

                .getResourceAsStream("/page.properties");

        try {

            p.load(inputStream);

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    public static int getPageSize() {

        return Integer.parseInt(p.getProperty("pageSize"));

    }

    public static int getPageNumber() {

        return Integer.parseInt(p.getProperty("pageNumber"));

    }

    public static void main(String[] args) {

        System.out.println(getPageSize());

    }

}

四、page.properties配置文件：

pageSize=5

pageNumber=1

五、action方法：

/**

     * @Title: findAllPlaneLibrary

     * @Description: 查询所有飞机实体

     * @param @return 跳转到/entity_list.jsp

     * @return String 返回类型

     * @throws

     */

    public String findAllPlaneLibrary() {

        try {

            /** 查询飞机类型 **/

            List<EntityLibrary> entityLibraryList = entityLibraryService

                    .findEntityLibraryByBelongsLibrarycode("1000001");

            request.setAttribute("entityLibraryList", entityLibraryList);

            /**分页条件查询**/

            /**获取查询参数**/

            String name = planeLibrary.getName();

            String type = planeLibrary.getType();

            List<PlaneLibrary> planeLibraryList = planeLibraryService.findAll(name,type,speedStart,speedEnd);

            String pageNoStr = request.getParameter("pageNo");

            int pageNo = PropertyUtil.getPageNumber();

            if (pageNoStr != null && !pageNoStr.equals("")) {

                pageNo = Integer.parseInt(pageNoStr);

            }

            int recordCount = planeLibraryList.size();

            int pageSize = PropertyUtil.getPageSize();

            int startNo = (pageNo - 1) * pageSize;

            List<PlaneLibrary> result = null;

            if (recordCount <= pageSize) {

                result = planeLibraryList;

            } else {

                if (startNo + pageSize > recordCount) {

                    result = planeLibraryList.subList(startNo, recordCount);

                } else {

                    result = planeLibraryList.subList(startNo, startNo

                            + pageSize);

                }

            }

            if (planeLibraryList != null && planeLibraryList.size() > 0) {

                request.setAttribute("result", result);

                request.setAttribute("recordCount", recordCount);

                request.setAttribute("pageNo", pageNo);

                request.setAttribute("pageSize", pageSize);

                request.setAttribute("name", name);

                request.setAttribute("type", type);

                request.setAttribute("speedStart", speedStart);

                request.setAttribute("speedEnd", speedEnd);

            }

        } catch (Exception e) {

            e.fillInStackTrace();

        }

        return "findAllPlaneLibrary";

    }

七、Jsp页面配置

添加引用：

<%@ taglib uri="/mytaglib" prefix="mytag"%>

遍历查询结果集合：

<s:iterator value="#request.result" id="planeLibrary" status="i">

    <tr>

        <td class="center_td"><s:property value="#i.index+1" /></td>

        <td><a href="#"><img class="thumbnails" alt="#"

                src="../<s:property value="#planeLibrary.imagepath"/>" width="64px"

                height="64px" /> <s:property value="#planeLibrary.name" /> </a></td>

        <td><s:property value="#planeLibrary.type" /></td>

        <td><s:property value="#planeLibrary.speed" /></td>

        <td><s:property value="#planeLibrary.bombload" /></td>

        <td>4200</td>

        <td>

            <div class="btn-group">

                <a href="../html/entity_view.html" class="btn" title="查看"><i

                    class="icon-file"></i> </a> <a href="../html/entity_add.html"

                    class="btn" title="修改"><i class="icon-pencil"></i> </a> <a

                    class="btn" title="删除"><i class="icon-remove"></i> </a>

            </div>

        </td>

    </tr>

</s:iterator>

查询条件回显：

<form class="form-search" action="planeLibrary_findAllPlaneLibrary.action" method="post">

    飞机名称： <input type="text" class="input-medium span2" name="name" value="<s:property value="#request.name"/>">&nbsp;&nbsp;

    飞机类型： <select class="drop_down" name="type">

        <option value="全部">全部</option>

        <s:iterator value="#request.entityLibraryList" id="extendAttribute">

             <s:if test="#request.type == #extendAttribute.name">

                  <option selected="selected" value="<s:property value="#extendAttribute.name"/>"><s:property value="#extendAttribute.name"/></option>

             </s:if>

             <s:else>

                  <option value="<s:property value="#extendAttribute.name"/>"><s:property value="#extendAttribute.name"/></option>

             </s:else>

        </s:iterator>

    </select>&nbsp;&nbsp; 航速： <input type="text" name="speedStart" value="<s:property value="#request.speedStart"/>" class="input-medium span2">&nbsp;&nbsp;

    ~ <input name="speedEnd" type="text" value="<s:property value="#request.speedEnd"/>" class="input-medium span2">

    <button type="submit" class="btn">

        <i class="icon-search"></i> 搜索

    </button>

</form>

添加分页条：

<div class="pagination pagination-centered">

        <mytag:pager pageNo="${pageNo}" recordCount="${recordCount}"

              pageSize="${pageSize}" url="planeLibrary_findAllPlaneLibrary.action" />

</div>

八、注意

该分页标签支持条件查询分页（需要将查询条件回显到jsp页面），点击分页条会对该条件进行分页显示。

原理：点击分页条时，标签会将JSP页面中的所有文本框和下拉列表框转化成form表单提交。

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