Java 读取两个excel表并进行每一行的数据比较，不相同的列输出

你可以使用Apache POI库来读取Excel文件，并使用Java中的集合来比较两个表中的数据。以下是一个简单的示例代码，它可以读取两个名为“table1.xlsx”和“table2.xlsx”的Excel文件，并比较每行中的数据。如果两行数据不相同，它将输出该行的列值。

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

public class ExcelComparator {

    public static void main(String[] args) throws IOException {
        String file1 = "table1.xlsx";
        String file2 = "table2.xlsx";

        List<Map<String, String>> table1 = readExcel(file1);
        List<Map<String, String>> table2 = readExcel(file2);

        // Compare two tables
        for (int i = 0; i < table1.size(); i++) {
            Map<String, String> row1 = table1.get(i);
            Map<String, String> row2 = table2.get(i);

            for (Map.Entry<String, String> entry : row1.entrySet()) {
                String columnName = entry.getKey();
                String value1 = entry.getValue();
                String value2 = row2.get(columnName);

                if (!value1.equals(value2)) {
                    System.out.println("Different values in Row " + (i+1) + ", Column " + columnName + ": " + value1 + " " + value2);
                }
            }
        }
    }

    private static List<Map<String, String>> readExcel(String filename) throws IOException {
        List<Map<String, String>> table = new ArrayList<>();

        File excelFile = new File(filename);
        FileInputStream inputStream = new FileInputStream(excelFile);

        Workbook workbook = WorkbookFactory.create(inputStream);
        Sheet sheet = workbook.getSheetAt(0);

        Row headerRow = sheet.getRow(0);
        List<String> columnNames = new ArrayList<>();
        for (int i = 0; i < headerRow.getLastCellNum(); i++) {
            Cell cell = headerRow.getCell(i);
            columnNames.add(cell.getStringCellValue());
        }

        for (int i = 1; i <= sheet.getLastRowNum(); i++) {
            Row row = sheet.getRow(i);
            Map<String, String> rowData = new HashMap<>();
            for (int j = 0; j < columnNames.size(); j++) {
                Cell cell = row.getCell(j);
                String value = "";
                if (cell != null) {
                    switch (cell.getCellType()) {
                        case STRING:
                            value = cell.getStringCellValue();
                            break;
                        case NUMERIC:
                            value = String.valueOf(cell.getNumericCellValue());
                            break;
                        case BOOLEAN:
                            value = String.valueOf(cell.getBooleanCellValue());
                            break;
                        default:
                            value = "";
                    }
                }
                rowData.put(columnNames.get(j), value);
            }
            table.add(rowData);
        }

        inputStream.close();

        return table;
    }
}

请注意，此示例代码假定两个Excel文件具有相同的列名和相同的行数。如果两个文件不匹配，代码可能会抛出异常或输出错误的结果。你需要自己根据实际情况进行修改和优化。