java发送带有附件的电子邮件

我建议使用ApacheCommons电子邮件，而不是直接使用JavaMail API。后者非常棘手，有很多边缘条件，需要对MIME有很好的理解

以下是您要求的示例：

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我很幸运地使用了这个库，并根据第一手经验推荐了它

现在它是可读的，请解释它有什么问题

package abc;

import java.io.FileInputStream;
import java.io.FileOutputStream;  
import java.io.IOException;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFBorderFormatting;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;

import java.util.Iterator;

public class read {
    public static void main(String[] args) throws IOException {

        String Filepath = "C:\\test.xls";
        FileInputStream input = new FileInputStream("Filepath");

        HSSFWorkbook wb = new HSSFWorkbook(); //Access the workbook
        //Access the worksheet, so that we can update / modify it.     
        HSSFSheet worksheet = wb.getSheetAt(0); 


        Cell cell = null; // declare a Cell object

        cell = worksheet.getRow(2).getCell(2);
        CellStyle style = wb.createCellStyle();
        style.setFillForegroundColor(IndexedColors.BLUE.getIndex());

        cell.setCellStyle(style);

        try {           
            FileOutputStream output = new FileOutputStream(
                "C:\\Users\\TEMP\\Desktop\\downloads.xls"
            );
            wb.write(output);
            output.close(); 
        } catch(Exception e){
            e.printStackTrace();
        }        
    }
}