List<List<Object>> importFile = ExcelImport.importFile(file);
时间: 2024-06-02 13:13:35 浏览: 13
This code declares a variable called "importFile" of type List<List<Object>> and assigns it the value returned by the method "importFile" from the "ExcelImport" class, which takes a file as a parameter. The method is likely designed to read data from an Excel file and return it as a list of lists of objects, where each inner list represents a row and each object represents a cell value in that row.
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如何解决An error occurred at line: [9] in the jsp file: [/addProduct.jsp] Map cannot be resolved to a type 6: To change this template use File | Settings | File Templates. 7: --%> 8: <%@ page contentType="text/html;charset=UTF-8" language="java" %> 9: <%List<Map<String,Object>> list = (List<Map<String, Object>>) session.getAttribute("date");%> 10: <html> 11: <head> 12: <title>Title</title> Stacktrace:
这个错误一般是由于缺少对Map类的引用导致的。您可以尝试在JSP文件的开头添加以下导入语句:
```
<%@ page import="java.util.Map" %>
```
如果这个解决方法不起作用,您可以检查一下类路径,确保必要的库已经包含进来了。如果仍然无法解决问题,您可以尝试在项目中引入相关的库文件。例如,如果您正在使用Maven,则可以在pom.xml中添加以下依赖项:
```
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
```
这个依赖项将包含所需的Java Servlet API库。
将List<Mao<String,String>>转换为List<RowRenderData>
好的,对于将List<Map<String,String>>转换为List<RowRenderData>,你可以参考以下代码实现:
```
import cn.afterturn.easypoi.word.WordExportUtil;
import cn.afterturn.easypoi.word.entity.WordImageEntity;
import cn.afterturn.easypoi.word.entity.table.*;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class ListConverter {
public static List<RowRenderData> convert(List<Map<String, String>> list) {
List<RowRenderData> rowRenderDataList = new ArrayList<>();
for (Map<String, String> map : list) {
RowRenderData rowRenderData = new RowRenderData();
List<TableCellRenderData> tableCellRenderDataList = new ArrayList<>();
for (String key : map.keySet()) {
String value = map.get(key);
TableCellRenderData tableCellRenderData = new TableCellRenderData(value);
tableCellRenderDataList.add(tableCellRenderData);
}
rowRenderData.setRowData(tableCellRenderDataList);
rowRenderDataList.add(rowRenderData);
}
return rowRenderDataList;
}
public static void main(String[] args) throws Exception {
List<Map<String, String>> list = new ArrayList<>();
Map<String, String> map1 = Map.of("name", "张三", "age", "20");
Map<String, String> map2 = Map.of("name", "李四", "age", "25");
Map<String, String> map3 = Map.of("name", "王五", "age", "30");
list.add(map1);
list.add(map2);
list.add(map3);
List<RowRenderData> rowRenderDataList = convert(list);
File templateFile = new File("template.docx");
FileInputStream in = new FileInputStream(templateFile);
XWPFDocument document = new XWPFDocument(in);
Map<String, Object> map = Map.of("list", rowRenderDataList);
WordExportUtil.exportWord07(document, map);
FileOutputStream out = new FileOutputStream("output.docx");
document.write(out);
out.close();
in.close();
}
}
```
上面的代码中,我们首先定义一个convert()方法,该方法输入一个List<Map<String,String>>类型的列表,输出一个List<RowRenderData>类型的列表。在convert()方法中,我们遍历输入的列表,对于每个Map对象,我们将其转换为一个RowRenderData对象,再将该对象添加到输出列表中。
转换时,我们需要遍历Map对象中的每个键值对,对于每个键值对,我们将其值包装成一个TableCellRenderData对象,再将该对象添加到RowRenderData对象的列表中。
最后,我们在main()方法中定义一个List<Map<String,String>>类型的列表,为该列表添加了三个元素,并且演示了如何将该列表转换为List<RowRenderData>类型的列表,并将它写入到Word文档中。在实际使用中,你需要修改模板文件名、数据源以及生成文件名等相关参数。