1 package cn.buaa.core.util; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 6 7 public class QueryHelper { 8 9 //from子句 10 private String fromClause = ""; 11 //where子句 12 private String whereClause = ""; 13 //orderBy子句 14 private String orderByClause = ""; 15 16 private List<Object> parameters; 17 18 //排序常量 19 public static String ORDER_BY_DESC = "DESC"; //降序 20 public static String ORDER_BY_ASC = "ASC"; //升序 21 /** 22 * 構造from子句(有別名) 23 * @param clazz 實體類 24 * @param alias 實體類對應的別名 25 */ 26 public QueryHelper(Class clazz,String alias){ 27 fromClause = "From " + clazz.getSimpleName() + " " +alias ; 28 System.out.println(fromClause); 29 } 30 /** 31 * 構造from子句（無別名） 32 * @param clazz 實體類 33 */ 34 public QueryHelper(Class clazz){ 35 fromClause = "From " + clazz.getSimpleName() ; 36 } 37 38 /** 39 * 構造where子句 40 * @param condition 查詢條件語句：例如：i.title like ? 41 * @param params 查詢條件語句中？對應的查詢條件的值： 例如：%標題% 42 */ 43 public void addCondition(String condition , Object... params ){ 44 if(whereClause.length()>1){//非第一個查詢條件 45 whereClause += " AND " + condition; 46 }else{//第一個查詢條件 47 whereClause += " WHERE " + condition; 48 } 49 50 //設置查詢條件值到查詢條件集合中 51 if(parameters == null){ 52 parameters = new ArrayList<Object>(); 53 } 54 if(params != null){ 55 for(Object param : params){ 56 parameters.add(param); 57 } 58 } 59 60 } 61 62 /** 63 * 構造order by子句 64 * @param property 排序屬性：如：i.createTime 65 * @param order 排序順序，如：DESC 或 ASC 66 */ 67 public void addOrderByProperty(String property,String order){ 68 if(orderByClause.length()>1){//非第一個排序屬性 69 orderByClause += " ," + property + " " + order; 70 }else{//第一個排序屬性 71 orderByClause += " ORDER BY " + property + " " + order; 72 } 73 } 74 //查詢hql語句 75 public String getQueryListHql(){ 76 77 return fromClause + whereClause + orderByClause ; 78 } 79 80 //查詢統計數的hql語句 81 public String getQueryCountHql(){ 82 83 return "SELECT COUNT( * ) " + fromClause + whereClause; 84 } 85 86 //查詢hql語句中？對應的查詢條件值集合 87 public List<Object> getParameters(){ 88 89 return parameters; 90 } 91 }
2、dao邏輯處理代碼
@Override public PageResult getPageResult(QueryHelper queryHelper, int pageNo, int pageSize) { Query query = getSession().createQuery(queryHelper.getQueryListHql()); List<Object> parameters = queryHelper.getParameters(); if(parameters != null){ for(int i= 0;i<parameters.size();i++){ query.setParameter(i, parameters.get(i)); } } if(pageNo<1) pageNo =1; query.setFirstResult((pageNo-1)*pageSize); query.setMaxResults(pageSize); List items = query.list(); //獲取總記錄數 Query queryCount = getSession().createQuery(queryHelper.getQueryCountHql()); if(parameters != null){ for(int i= 0;i<parameters.size();i++){ queryCount.setParameter(i, parameters.get(i)); } } long totalCount = (long) queryCount.uniqueResult(); return new PageResult(totalCount, pageNo, pageSize, items); }
3、action調用處理代碼
1 protected PageResult pageResult; 2 private int pageNo; 3 private int pageSize; 4 。。。。 5 6 // 列表頁面 7 public String listUI() throws Exception { 8 // 加載分類集合 9 ActionContext.getContext().getContextMap().put("infoTypeMap", Info.INFO_TYPE_MAP); 10 QueryHelper queryHelper = new QueryHelper(Info.class,"i"); 11 try { 12 if(info != null){ 13 if(StringUtils.isNotBlank(info.getTitle())){ 14 //搜索框亂碼問題解決 15 info.setTitle(URLDecoder.decode(info.getTitle(),"utf-8")); 16 queryHelper.addCondition("i.title like ? ", "%" + info.getTitle() + "%"); 17 } 18 queryHelper.addCondition("i.state = ?", "1"); 19 } 20 //根據創建時間降序排序 21 queryHelper.addOrderByProperty(" i.createTime ", QueryHelper.ORDER_BY_DESC); 22 //infoList = infoService.findObjects(queryHelper); 23 pageResult = infoService.getPageResult(queryHelper,getPageNo(),getPageSize()); 24 } catch (Exception e) { 25 throw new ActionException("action出現異常：" + e.getMessage()); 26 } 27 return "listUI"; 28 }
4、struts配置文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <package name="info-action" namespace="/nsfw" extends="base-default"> <action name="info_*" class="cn.buaa.nsfw.info.action.InfoAction" method="{1}"> <result name="{1}">/WEB-INF/jsp/nsfw/info/{1}.jsp</result> <result name="list" type="redirectAction"> <param name="actionName">info_listUI</param> <!-- 搜索框搜索值回顯 --> <param name="info.title">${strTitle}</param> <param name="pageNo">${pageNo}</param> <!-- 解決搜索框框亂碼 --> <param name="encode">true</param> </result> </action> </package> </struts>
5、jsp顯示頁面
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <%@include file="/common/header.jsp"%> <title>信息發佈管理</title> <script type="text/javascript"> //全選、全反選 function doSelectAll() { // jquery 1.6 前 //$("input[name=selectedRow]").attr("checked", $("#selAll").is(":checked")); //prop jquery 1.6+建議使用 $("input[name=selectedRow]").prop("checked", $("#selAll").is(":checked")); } //添加 function doAdd(){ document.forms[0].action="${basePath}nsfw/info_addUI.action"; document.forms[0].submit(); } //編輯 function doEdit(id){ document.forms[0].action="${basePath}nsfw/info_editUI.action?info.infoId=" + id; document.forms[0].submit(); } //刪除 function doDelete(id){ document.forms[0].action="${basePath}nsfw/info_delete.action?info.infoId=" + id; document.forms[0].submit(); } //多選刪除 function doDeleteAll(){ document.forms[0].action="${basePath}nsfw/info_deleteSelected.action"; document.forms[0].submit(); } //異步發佈信息，信息的id及將要改成的信息狀態 function doPublic(infoId,state){ //1、更新信息狀態 $.ajax({ url:"${basePath}nsfw/info_publicInfo.action", data:{"info.infoId":infoId,"info.state":state}, type:"post", success:function(msg){ //2、更新狀態欄，操作欄的顯示值 if("更新狀態成功" == msg){ if(state == 1){//說明信息狀態已被改成發佈，狀態欄顯示發佈，操作欄顯示停用 $("#show_"+infoId).html("發佈"); $("#oper_"+infoId).html('<a href="javascript:doPublic(\''+infoId+'\',0)">停用</a>'); }else{ $("#show_"+infoId).html("停用"); $("#oper_"+infoId).html('<a href="javascript:doPublic(\''+infoId+'\',1)">發佈</a>'); } }else{ alert("更新信息狀態失敗！"); } }, error:function(){ alert("更新信息狀態失敗！"); } }); } var list_url = "${basePath}nsfw/info_listUI.action"; function doSearch(){ //重置頁號 $("#pageNo").val(1); document.forms[0].action= list_url ; document.forms[0].submit(); } </script> </head> <body class="rightBody"> <form name="form1" action="" method="post"> <div class="p_d_1"> <div class="p_d_1_1"> <div class="content_info"> <div class="c_crumbs"><div><b></b><strong>信息發佈管理</strong></div> </div> <div class="search_art"> <li> 信息標題：<s:textfield name="info.title" cssClass="s_text" id="infoTitle" cssStyle="width:160px;"/> </li> <li><input type="button" class="s_button" value="搜 索" onclick="doSearch()"/></li> <li style="float:right;"> <input type="button" value="新增" class="s_button" onclick="doAdd()"/> <input type="button" value="刪除" class="s_button" onclick="doDeleteAll()"/> </li> </div> <div class="t_list" style="margin:0px; border:0px none;"> <table width="100%" border="0"> <tr class="t_tit"> <td width="30" align="center"><input type="checkbox" id="selAll" onclick="doSelectAll()" /></td> <td align="center">信息標題</td> <td width="120" align="center">信息分類</td> <td width="120" align="center">創建人</td> <td width="140" align="center">創建時間</td> <td width="80" align="center">狀態</td> <td width="120" align="center">操作</td> </tr> <s:iterator value="pageResult.items" status="st"> <tr <s:if test="#st.odd"> bgcolor="f8f8f8" </s:if> > <td align="center"><input type="checkbox" name="selectedRow" value="<s:property value='infoId'/>"/></td> <td align="center"><s:property value="title"/></td> <td align="center"> <s:property value="#infoTypeMap[type]"/> </td> <td align="center"><s:property value="creator"/></td> <td align="center"><s:date name="createTime" format="yyyy-MM-dd HH:mm"/></td> <td id="show_<s:property value='infoId'/>" align="center"><s:property value="state==1?'發佈':'停用'"/></td> <td align="center"> <span id="oper_<s:property value='infoId'/>"> <s:if test="state==1"> <a href="javascript:doPublic('<s:property value='infoId'/>',0)">停用</a> </s:if> <s:else> <a href="javascript:doPublic('<s:property value='infoId'/>',1)">發佈</a> </s:else> </span> <a href="javascript:doEdit('<s:property value='infoId'/>')">編輯</a> <a href="javascript:doDelete('<s:property value='infoId'/>')">刪除</a> </td> </tr> </s:iterator> </table> </div> </div> <jsp:include page="/common/pageNavigator.jsp"/> </div> </form> </body> </html>
6、分頁代碼jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags"%> <div class="c_pate" style="margin-top: 5px;"> <s:if test="pageResult.totalCount > 0"> <table width="100%" class="pageDown" border="0" cellspacing="0" cellpadding="0"> <tr> <td align="right"> 總共<s:property value="pageResult.totalCount"/>條記錄，當前第<s:property value="pageResult.pageNo"/>頁， 共 <s:property value="pageResult.totalPageCount"/> 頁 <s:if test="pageResult.pageNo > 1"> <a href="javascript:doGoPage(<s:property value="pageResult.pageNo-1"/>)">上一頁</a> </s:if> <s:if test="pageResult.pageNo < pageResult.totalPageCount"> <a href="javascript:doGoPage(<s:property value="pageResult.pageNo+1"/>)">下一頁</a> </s:if> 到 <input id="pageNo" name="pageNo" type="text" style="width: 30px;" onkeypress="if(event.keyCode == 13){doGoPage(this.value);}" min="1" max="" value="<s:property value="pageResult.pageNo"/>" /> </td> </tr> </table> </s:if><s:else> 暫無數據！ </s:else> </div> <script type="text/javascript"> //翻頁 function doGoPage(pageNo){ document.getElementById("pageNo").value = pageNo; document.forms[0].action =list_url; document.forms[0].submit(); } </script> </div>
7、特別注意搜索框的回顯問題以及會先後亂碼的處理，還有struts配置文件的傳值問題