A few lines of code can realize complex excel import and export. This tool class is really powerful!

source ：blog.csdn.net/weixin_43225813/article/details/108995011

Function is introduced

IMPORT

• ExcelHandle Core processor
• ExcelWorkbookManage excel All sheet management
• ExcelInitConfig Configuration file initialization
• AbstractFileParser File conversion class

alanpoi import What are the advantages ？

• The user does not need to introduce poi And so on jar

• Parsing large files in milliseconds , Support one key parsing for multiple sheet Tab , You don't need to match and parse all the data in a certain format

• No matter how complex your system is , How many imports ,alanpoi All for , And return exactly what you need , Reduce developer workload

• At present, the external business is becoming more and more complex , The requirements for various functions are becoming more and more strict , Of course, import is no exception ,alanpoi Support error one click write back excel, Corresponding to each line

• alanpoi Flexible and scalable , Provides ExcelConsumeInterface Interface , You can inherit it , Realization valid、error、end Three ways to write your own business

• • valid: Method parameters return excel All the data , Users can perform self verification
  • error: Import errors will call back
  • end: The method parameter returns the data successfully verified ,valid Data that fails the verification will not be returned , Users can operate persistence or other businesses by themselves

How do you use it? alanpoi Implement import

Project use :

<dependency>
    <groupId>com.alanpoi</groupId>
    <artifactId>alanpoi-analysis</artifactId>
    <version>1.3.0</version>
</dependency>

In a word ： One configuration, one inheritance, one invocation

I. configuration

In the project resources Create a new excel-config.xml file ,cosume Configure your own consumption class path in , Inherit ExcelConsumeInterface Interface ,sheet Medium vo It's the present sheet Serialized object path ,column Configuration is, of course vo The property of .

among name Optional fields , Fill it in and match it with this excel Name , If you don't fill it out, you will follow offset The order ; The import contains multiple sheet Configure multiple

<?xml version = "1.0" encoding = "GB2312"?>
<exg name="excelId" version="1.0" file-type="excel">
  <excel id="ACCOUNT" consume="com.xxx.FinAccountImportHandler">
     <sheet index="0" row-start="1" column-start="0"
            vo="com.xxx.vo.FinAccountImportVO">
         <column name=" company / Supplier No " offset="1">companyCode</column>
         <column name=" company / Name of supplier " offset="2">companyName</column>
         <column name=" Bank Account " offset="3">bankAccount</column>
         <column name=" Bank of deposit " offset="4">bankName</column>
     </sheet>
 </excel>
</exg>

I. inheritance

consume Class inheritance ExcelConsumeInterface Interface , Implementation method

/**
 * when error will  call 
 *
 * @param excelError
 */
void error(ExcelError excelError);

/**
 * custom valid data
 *
 * @param workbookId
 * @param sheetDataList
 */
void validData(String workbookId, List<ExcelSheetData> sheetDataList, Map<Serializable, Object> excelParam);

/**
 * @param sheetDataList return success data
 */
void end(List<ExcelSheetData> sheetDataList, Map<Serializable, Object> excelParam);

One call

The user calls ExcelExportUtil Class customImportData that will do , Parameters excelId Namely excel-conifg.xml Configured in id

Export

describe

It can be implemented in one line of code without the second line , If I can't , Then add another line ！

Pattern

Annotation mode export ：

• ExcelSheet annotation ： Used to import classes , You can make sheet name , The color of the column header 、 typeface 、 Height 、 Width
• ExcelColum annotation : Used on the properties of the import class , You can specify the name of the column header , Cell style
• DateFormat annotation : Used on the properties of the import class , You can output to... In the specified format excel, Default "yyyy/MM/dd"
• NumFormat annotation : Used on the properties of the import class , You can output to... In the specified format excel, Default "00.00"

Examples ：

@ExcelSheet(name = " test ", backColor = AlanColors.GREEN, font = " Song style ", fontSize = 25)
@Data
public class ExportVO {
    @ExcelColumn(name = " name ", width = 32, link = "${url}")
    private String name;

    @ExcelColumn(name = " value ")
    private String value;

    @ExcelColumn(name = " amount of money ")
    @NumFormat(value = "0000.00##")
    private BigDecimal amount;

    @ExcelColumn(name = " Time format ")
    @DateFormat(value = "yyyy-MM-dd hh:mm:ss")
    private Date dateTime;

    @DateFormat
    @ExcelColumn(name = " Date formatting ")
    private java.sql.Date date;

    @ExcelColumn(isExist = false)
    private String url;
}

Use

Mode one . Export directly to browser

ExcelExportUtil.export(Colletion<?>,Class,HttpServletRequest,HttpServletResponse,fileName);

Mode two . call getWorkbook Get worksheet , Do it yourself workbook

ExcelExportUtil.getWorkbook(Collection<?> singleSheetData, Class<?> c)

Advanced use

Example 1 ： Export the specified column （ Dynamically export Columns ）

List<ExportVO> list = new ArrayList<>();
for (int i = 0; i < 500; i++) {
    ExportVO exportVO = new ExportVO();
    exportVO.setName("name" + i);
    exportVO.setValue(new BigDecimal(123.11 + i * 0.09));
    exportVO.setAmount(new BigDecimal(6666.666 + i * 10));
    exportVO.setDate(new Date(132324343 + i * 100));
    exportVO.setDateTime(new java.util.Date());
    list.add(exportVO);
}
List<String> colList = new ArrayList<>();
// Export only... In order add The column of 
colList.add("name");
colList.add("value");
// Call get workbook object ; It can also be called directly exportSpecifyCol Method to export to the browser 
Workbook workbook = ExcelExportUtil.getWorkbookSpecifyCol(list, ExportVO.class, colList);

Example 2 ： many sheet Tab export

List<ExportVO> list = new ArrayList<>();
List<Export2VO> list2 = new ArrayList<>();
for (int i = 0; i < 500; i++) {
    ExportVO exportVO = new ExportVO();
    exportVO.setName("name" + i);
    exportVO.setValue(new BigDecimal(123.11 + i * 0.09));
    exportVO.setAmount(new BigDecimal(6666.666 + i * 10));
    exportVO.setDate(new Date(132324343 + i * 100));
    exportVO.setDateTime(new java.util.Date());
    list.add(exportVO);
    Export2VO export2VO = new Export2VO();
    export2VO.setName("name" + i);
    export2VO.setValue("value" + i);
    export2VO.setAmount(new BigDecimal(6666.666 + i * 10));
    export2VO.setDate(new Date(132324343 + i * 100));
    export2VO.setDateTime(new java.util.Date());
    list2.add(export2VO);
}
Map<Class<?>, Collection<?>> map = new HashMap<>();
map.put(ExportVO.class, list);
map.put(Export2VO.class, list2);
// Call get workbook object ; It can also be called directly exportByMultiSheet Method to export to the browser 
Workbook workbook = ExcelExportUtil.getWorkbookByMultiSheet(map);

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