SSH自定义分页标签

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。