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springMVC和FreeMarker简单方式导出excel

2017-04-05 18:42 429 查看
一般Java操作excel文件比较流行的是apache poi包。

因为我们只是导出数据，不需要读取正规的excel文件，所以我们可以通过输出html格式的xls文件来简单实现导出excel。

环境使用的springMVC,展示使用的是FreeMarker

Action

@RequestMapping(value="export")
public String sfnExport(HttpServletRequest request,HttpServletResponse response){
String export_type = request.getParameter("export_type");
request.setAttribute("export_type", export_type);

Map<String,Integer> mapYearMonth =  setYearMonth(request);

List<ProjSatisfaction> dataFrom = projSatisfactionService.findProjects(mapYearMonth.get("year"), mapYearMonth.get("month"), false);
List<ProjSatisfaction> dataTo = projSatisfactionService.findProjects(mapYearMonth.get("year"), mapYearMonth.get("month"), true);

request.setAttribute("dataFromList", dataFrom);
request.setAttribute("dataToList", dataTo);
// 获取统计信息
request.setAttribute("sum", projSatisfactionService.getStatistics(mapYearMonth.get("year"), mapYearMonth.get("month")));

// 导出xls类型的html文件
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String export_date = sdf.format(new Date());
request.setAttribute("export_date", export_date);
String fileName = mapYearMonth.get("year")+"年"+ mapYearMonth.get("month")+"月服务评价统计_"+export_date+".xls";
response.setContentType("application/x-download");
response.setCharacterEncoding("UTF-8");
response.addHeader("Content-Disposition", "attachment;filename=" + StringHelper.convertTitle(fileName));
return "/sfn/export";
}
ftl

<html xmlns:v="urn:schemas-microsoft-com:vml"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns="http://www.w3.org/TR/REC-html40">
<html>
<head>
<title>导出服务评价结果</title>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="ProgId" content="Excel.Sheet" />

<style>
body {
font-family: "微软雅黑 宋体";
font-size: 14px;
}

table {
border: 0.5pt solid #888;
}

table td,table th {
border: 0.5pt solid #888;
}

.align_center {
text-align: center;
}
.noborder{
border:none;
}
</style>

</head>

<body>
<table id="table_main" >
<col width="39"  style='mso-width-source:userset;mso-width-alt:1300;'/>
<col width="300"  style='mso-width-source:userset;mso-width-alt:6000;'/>
<col width="112"  style='mso-width-source:userset;mso-width-alt:6000;'/>
<col width="67"  style='mso-width-source:userset;mso-width-alt:2500;'/>
<col width="39" style='mso-width-source:userset;mso-width-alt:1300;'/>
<col width="53" style='mso-width-source:userset;mso-width-alt:1696;'/>
<col width="72" style='mso-width-source:userset;mso-width-alt:2304;'/>
<!-- 1st line -->
<tr>
<td class="align_center" colspan="7">
<h3>服务评价结果</h3>
</td>
</tr>
<tr>
<td class="align_center" colspan="3">
数据时间:${select_year}年${select_month}月
</td>
<td class="align_center" colspan="4">
导出时间:${export_date}
</td>
</tr>

<!-- 2nd line -->
<tr>
<td class="align_center" colspan="7">
<h4>统计信息</h4>
</td>
</tr>
<tr>
<th>总数</th>
<th>未审核项目数</th>
<th>已审核项目数</th>
<th style="color:#FF00FF;">非常满意</th>
<th style="color:#0000FF;">满意</th>
<th style="color:#008000;">一般</th>
<th style="color:#FF0000;">不满意</th>
</tr>
<tr>
<td class="align_center">${sum["all"]}</td>
<td class="align_center">${sum["normal"]}</td>
<td class="align_center">${sum["approve"]}</td>
<td class="align_center" style="color:#FF00FF;">${sum["level1"]}</td>
<td class="align_center" style="color:#0000FF;">${sum["level2"]}</td>
<td class="align_center" style="color:#008000;">${sum["level3"]}</td>
<td class="align_center" style="color:#FF0000;">${sum["level4"]}</td>
</tr>
<!-- 3rd line -->
<tr>
<td class="align_center" colspan="7">
<h4>未审核项目评价 <#if export_type="_3_4_"> (一般与不满意) </#if></h4></td>
</tr>
<tr>
<th>编号</th>
<th>未审核项目编码</th>
<th>未审核项目名称</th>
<th>审核结果</th>
<td colspan="3" class="noborder"></td>
</tr>
<#assign index = 1>
<#list dataFromList as data>
<#if data.assesslevel == 1>
<#assign levelColor="#FF00FF">
<#elseif data.assesslevel == 2>
<#assign levelColor="#0000FF">
<#elseif data.assesslevel == 3>
<#assign levelColor="#008000">
<#elseif data.assesslevel == 4>
<#assign levelColor="#FF0000">
</#if>
<#if export_type == "all" || export_type?contains(data.assesslevel+"")>
<tr>
<td x:num>${index}</td>
<td x:str>${data.projectId}</td>
<td x:str>${data.projectName}</td>
<td class="align_center" style="color:${levelColor};" x:str>${data.assessResult}</td>
<td colspan="3" class="noborder"></td>
</tr>
<#assign index=index+1>
</#if>
</#list>

<!-- 4th line -->
<tr class="align_center">
<td colspan="7">
<h4>已审核项目评价 <#if export_type="_3_4_"> (一般与不满意) </#if></h4>
</td>
</tr>
<tr>
<th>编号</th>
<th>已审核项目编码</th>
<th>已审核项目名称</th>
<th>审核结果</th>
<td colspan="3" class="noborder"></td>
</tr>
<#assign index = 1>
<#list dataToList as data>
<#if data.assesslevel == 1>
<#assign levelColor="#FF00FF">
<#elseif data.assesslevel == 2>
<#assign levelColor="#0000FF">
<#elseif data.assesslevel == 3>
<#assign levelColor="#008000">
<#elseif data.assesslevel == 4>
<#assign levelColor="#FF0000">
</#if>
<#if export_type == "all" || export_type?contains(data.assesslevel+"")>
<tr>
<td x:num>${index}</td>
<td x:str>${data.projectId}</td>
<td x:str>${data.projectName}</td>
<td class="align_center" style="color:${levelColor};" x:str>${data.assessResult}</td>
<td colspan="3" class="noborder"></td>
</tr>
<#assign index=index+1>
</#if>
</#list>
</table>
</body>
</html>


主要分析一下ftl文件内容

1.要声明以下命名空间

<html xmlns:v="urn:schemas-microsoft-com:vml"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns="http://www.w3.org/TR/REC-html40">

2.x:num 代表此格是数据类型，x:str代表此格式字符类型，这个很重要，如果你要显示的字符中都是数字，在不设置此字符的情况下，过长的内容会被excel显示成科学计数格式。

<td x:num>${index}</td>
<td x:str>${data.projectId}</td>
3. 最好不要多个表格嵌套，将多个表格统一为一个表，这样才能设置col，控制每一列的宽度。否则很多地方不可控制的换行不美观。width 和mso-width-alt 参数是1:32的比例，但我只发现设置mso-width-alt有用，所以下面有几组数据width和mso-width-alt对不上是因为我只更改了mso-width-alt参数。不知道width参数可能会在什么情况下有用，目前先保留了。

<col width="39"  style='mso-width-source:userset;mso-width-alt:1300;'/>
<col width="300"  style='mso-width-source:userset;mso-width-alt:6000;'/>
<col width="112"  style='mso-width-source:userset;mso-width-alt:6000;'/>
<col width="67"  style='mso-width-source:userset;mso-width-alt:2500;'/>
<col width="39" style='mso-width-source:userset;mso-width-alt:1300;'/>
<col width="53" style='mso-width-source:userset;mso-width-alt:1696;'/>
<col width="72" style='mso-width-source:userset;mso-width-alt:2304;'/>


4.action中转换方法，保障中文文件名不会乱码

public static String convertTitle(String title){
String str = "";
try {
str = new String( title.replaceAll(" ", "_").getBytes("gb2312"), "ISO8859-1" );
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return str;
}
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