Apache POI导出Excel工具

使用Apache POI导出Excel报表

<!-- Poi包 -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.15</version>
</dependency>

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 <T> void writeExcel(List<T> 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<User> userList = new ArrayList<User>();
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();
}
}

}

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
a5aa
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;
}

}