Apache POI导出Excel工具

使用Apache POI导出Excel报表

以下工具使用的是最新的POI-3.15版本，使用其它版本POI时可能需要修改部分代码（可自行修改表头部分的样式）。直接上代码吧！

1、 Maven 依赖：

    
    <dependency>
        <groupId>org.apache.poigroupId>
        <artifactId>poiartifactId>
        <version>3.15version>
    dependency>

2、工具源码（包含测试代码）

    import java.beans.PropertyDescriptor;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;

    import org.apache.commons.beanutils.BeanUtils;
    import org.apache.poi.hssf.usermodel.HSSFCell;
    import org.apache.poi.hssf.usermodel.HSSFCellStyle;
    import org.apache.poi.hssf.usermodel.HSSFFont;
    import org.apache.poi.hssf.usermodel.HSSFRow;
    import org.apache.poi.hssf.usermodel.HSSFSheet;
    import org.apache.poi.hssf.usermodel.HSSFWorkbook;
    import org.apache.poi.hssf.util.HSSFColor;
    import org.apache.poi.ss.usermodel.BorderStyle;
    import org.apache.poi.ss.usermodel.FillPatternType;
    import org.apache.poi.ss.usermodel.HorizontalAlignment;

    public class ExcelHssfDemo {
    public static  void writeExcel(List dataList, OutputStream output, String[] headNames, String[] fields, String datePattern)
            throws FileNotFoundException {

        SimpleDateFormat FORMAT = new SimpleDateFormat(datePattern);
        HSSFWorkbook workbook = new HSSFWorkbook();
        HSSFSheet sheet = workbook.createSheet();
        HSSFRow row = sheet.createRow((int) 0);
        getHeadStyle(workbook, row, headNames);

        try {
            T bean = null;
            for (int i = 0; i < dataList.size(); i++) {
                row = sheet.createRow((int) (i + 1));
                bean = dataList.get(i);
                for (int j = 0; j < headNames.length; j++) {
                    Object value = new PropertyDescriptor(fields[j], bean.getClass()).getReadMethod().invoke(bean, new Object[]{});
                    if (value instanceof Date) {
                        row.createCell(j).setCellValue(FORMAT.format((Date) value));
                    } else if (value instanceof Boolean) {
                        row.createCell(j).setCellValue((Boolean) value ? "是" : "否");
                    } else {
                        row.createCell(j).setCellValue(value);
                    }
                }
            }
            for (int i = 0; i < headNames.length; i++) {
                sheet.autoSizeColumn(i); // 自动调整列宽度
            }
            workbook.write(output);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (output != null) {
                    output.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    // 需要传入表头字段数组
    private static void getHeadStyle(HSSFWorkbook workbook, HSSFRow row, String[] headNames) {
        HSSFCellStyle style = workbook.createCellStyle();
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        style.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index);
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setBorderTop(BorderStyle.THIN);
        style.setBorderBottom(BorderStyle.THIN);
        style.setBorderLeft(BorderStyle.THIN);
        style.setBorderRight(BorderStyle.THIN);
        HSSFFont font = workbook.createFont();
        font.setFontName("宋体");
        font.setFontHeightInPoints((short) 11);
        font.setBold(true);
        style.setFont(font);

        HSSFCell cell = null;
        for (int i = 0; i < headNames.length; i++) {
            cell = row.createCell(i);// 生成表头,并定义样式
            cell.setCellValue(headNames[i]);
            cell.setCellStyle(style);
        }
    }

    public static void main(String[] args) {
        try {
            List userList = new ArrayList();
            for (int i = 0; i < 20; i++) {
                User user = new User("test:" + i, "passwd:" + i, 20 + i, new Date(), "I am test object", true);
                userList.add(user);
            }

            String path = "/home/felix/Desktop/";
            String[] userHeads = new String[] { "用户名", "密码", "年龄", "注册日期", "说明", "测试布尔变量" };
            String[] userFields = new String[] { "user_name", "password", "age", "time", "desri", "is" };
            writeExcel(userList, new FileOutputStream(path + "user.xls"), userHeads, userFields, "yyyy-MM-dd HH:mm:ss");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

3、测试实体类

public class User {

    public String user_name;
    public String password;
    public Integer age;
    public Date time;
    public String desri;
    public boolean is;

    public User(String user_name, String password, Integer age, Date time, String desri, boolean is) {
        super();
        this.user_name = user_name;
        this.password = password;
        this.age = age;
        this.time = time;
        this.desri = desri;
        this.is = is;
    }

    public boolean isIs() {
        return is;
    }

    public void setIs(boolean is) {
        this.is = is;
    }

    public String getUser_name() {
        return user_name;
    }

    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Date getTime() {
        return time;
    }

    public void setTime(Date time) {
        this.time = time;
    }

    public String getDesri() {
        return desri;
    }

    public void setDesri(String desri) {
        this.desri = desri;
    }

}

 
工作需要只写了导出部分，导入部分有时间再补上。