這幾天一直在做Java從資料庫查詢出的資料匯出Excel 的功能；做著做著發現：

當 row 超過65535的時候會報異常，該怎麼解決呢？

首先宣告一下，我的專案是基於Struts+ spring + mybatis的：以下方法僅供參考！

那麼我們先從jsp傳值開始看起吧

----jsp中主要程式碼

 $('#exportBtn').click(function(){						    	
				 param0 = getFormJson("#queryForm");
						 	    	 
				 flag =1 ;
				 var m =param0.m;
				 var startTime = param0.startTime; 
				 var endTime = param0.endTime; 
				 var siteid = param0.siteid;
						 	    	
window.location.href = "${ctx}/dataexport!getExportView.ce?m="+m+"&startTime="+ startTime + "&endTime=" + endTime+ "&siteid=" + siteid;
				 });
 

----DataexportMapper.java 中的 interface

public List<Map<String, Object>> getExportList(Map<String, Object> map);

public int getListCount(Map<String, Object> map);

----DataexportMapper.xml  寫的是動態SQL語句

 <!-- 根據siteid獲取 MAC資訊-->
	  <select id="getMacExportList" resultType="hashmap" parameterType="hashmap">
	  		select * from (
	  			select * from (
	  				select c.m,
	  				to_char(c.starttime, 'yyyy-mm-dd hh24:mi:ss') starttime,
	  				b.sitename, 
	  				rownum row_num
            from dbuser.hot_dict_m a, dbuser.hot_dict_s b,dbuser.hot_w c
      where a.wsiteid = b.siteid
          and a.wagentid = c.siteagent
			    		
			       <if test="@
 
[email protected](siteid) ">
			    			and  b.siteid=#{siteid}		
			        </if>	
			         <if test="@[email protected](siteid2) ">
			    			and  b.siteid=#{siteid2}		
			        </if>			        	  
				    <if test="@[email protected](m) ">
			    			and  M like '${m}%'
			        </if>
			         <if test="@[email protected](startTime) ">
							 <![CDATA[  
									and c.starttime >=
							          to_date(#{startTime}, 'yyyy-mm-dd hh24:mi:ss')
							]]>
					 </if>
					 <if test="@[email protected](endTime) ">
							<![CDATA[  
								and c.starttime <
							    to_date(#{endTime}, 'yyyy-mm-dd hh24:mi:ss')
						   ]]>
				     </if>
	  		 ) p1 where 
		        	 <![CDATA[  
				   		 rownum<= #{endIndex,jdbcType=INTEGER}	
					  ]]>
				
		)p2
		where
			  <![CDATA[  
			   	 row_num>= #{beginIndex,jdbcType=INTEGER}	
			  ]]>
							    
	  </select>

 <select id="getListCount" resultType="int" parameterType="hashmap">
	    	select count(*)
            from dbuser.hot_dict_m a, dbuser.hot_dict_s b,dbuser.hot_wi c
        where a.wsiteid = b.siteid
          and a.wagentid = c.siteagent
         		   <if test="@[email protected](siteid) ">
			    			and  b.siteid=#{siteid}		
			        </if>	
			         <if test="@[email protected](siteid2) ">
			    			and  b.siteid=#{siteid2}		
			        </if>	
	
			        <if test="@[email protected](m) ">
			    			and M like '${m}%'
			        </if>
			         <if test="@[email protected](startTime) ">
							 <![CDATA[  
									and c.starttime >=
							          to_date(#{startTime}, 'yyyy-mm-dd hh24:mi:ss')
							]]>
					 </if>
					 <if test="@[email protected](endTime) ">
							<![CDATA[  
								and c.starttime <
							    to_date(#{endTime}, 'yyyy-mm-dd hh24:mi:ss')
						   ]]>
				     </if>
	  </select>

注：row_num 是做分頁處理的；select中ID的名字一定要和ataexportMapper.java中的方法一致

----DataexportAction.java  

@Controller("DataexportAction")
@Scope("prototype")
@Results({
	@Result(name="getMacExportView",location="/WEB-INF/views/home/mapHotphoneMAC.jsp"),

public void getMacExportView(){
		Map<String,Object> params = getMapParams();
		
		params.put("userID", this.getUserContext().getUserId());
		params.put("beginIndex", 1);//起始行
		params.put("endIndex", dataServices.getListCount(params));//結束行
		HttpServletResponse response = ServletActionContext.getResponse();//取得response例項
		response.setCharacterEncoding("utf-8");//設定輸出的編碼
		dataexportServices.getExportList(params,response);
		
	}

下面是最主要的部分了：

----DataexportServices.java    匯出查詢資料及POI的分頁

int pageSize = 65533;
	
	public void getExportList(Map<String, Object> map,
			HttpServletResponse response) {
		HttpServletResponse response1 = response;
		List<Map<String,Object>> list = dataexportMapper.getExportList(map);
		
		DataExcelCreate(list,response1);
	}

	public void DataExcelCreate(List<Map<String, Object>> list,
			HttpServletResponse response) {
		HttpServletResponse response1 = response;
		String sheetname="sheet";
		HSSFWorkbook wb = new HSSFWorkbook();//建立HSSFWorkbook物件
		int size = list.size();
		if(response1 != null && size>0){
			int sheetCount = size % pageSize == 0? size / pageSize : size /pageSize + 1;
			for(int i = 1;i <= sheetCount;i++){
				HSSFSheet sheet = null;//建立新的sheet物件（Excel的表單）
				
				
				if (!StringUtils.isEmpty(sheetname)){
					sheet = wb.createSheet(sheetname+i);
				}else{
					sheet = wb.createSheet();
				}
				sheet.setDefaultRowHeightInPoints(20);//設定預設列高
				sheet.setDefaultColumnWidth(20);//設定預設列寬
				HSSFRow row1 = sheet.createRow(0);//建立索引行
				HSSFCell cell = row1.createCell(0);//建立單元格
				cell.setCellValue("MAC表");
				//合併單元格CellRangeAddress構造引數依次是：起始行，，截至行，起始列，截至列
				sheet.addMergedRegion(new CellRangeAddress(0,0,0,2));
				HSSFRow row2 =sheet.createRow(1);
				row2.createCell(0).setCellValue("M");   
				row2.createCell(1).setCellValue("開始時間");
				row2.createCell(2).setCellValue("名稱");
				int begin =(i-1)*pageSize;
				int end = begin + pageSize;
				int rowCount=2;
				if(end>size){
					end = size;
				}else{
					end =i* pageSize;
				}
				for(int j=begin;j<end;j++){
			    	HSSFRow row=sheet.createRow(rowCount); 
					rowCount++;
					Map map = list.get(j);
				    row.createCell(0).setCellValue((String) map.get("M"));
				    row.createCell(1).setCellValue((String) map.get("STARTTIME"));
				    row.createCell(2).setCellValue((String) map.get("SITENAME"));
			    }
			}
		}
		
	        OutputStream output;
	    try {
			output=response.getOutputStream();
			response.reset();
			response.setHeader("Content-disposition", "attachment;filename=details.xls");
			response.setContentType("application/msexcel");
			wb.write(output);
			output.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

友情提示：大家在呼叫方法的時候不要寫錯了，要對應起來

注：如果有什麼問題，可以提出，大家一起進步