需要的jar包:poi-3.14.jar

List集合导出成Excel表格
实体类

package job.util;

/**
*
* @className Employee
* @deprecated 导出的实体
* @author pengfei.xiong
* @date 2017年10月9日
*/
public class Employee {

private String name;

private String clazz;

private Integer year;

private Integer month;

private Integer day;

private double salary;

public Employee() {
};

public Employee(String name, String clazz, Integer year, Integer month, Integer day,
double salary) {
super();
this.name = name;
this.clazz = clazz;
this.year = year;
this.month = month;
this.day = day;
this.salary = salary;
}

/**
* @return name
*/
public String getName() {
return name;
}

/**
* @return year
*/
public Integer getYear() {
return year;
}

/**
* @return month
*/
public Integer getMonth() {
return month;
}

/**
* @return day
*/
public Integer getDay() {
return day;
}

/**
* @return salary
*/
public double getSalary() {
return salary;
}

/**
* @param name
* set name
*/
public void setName(String name) {
this.name = name;
}

/**
* @param year
* set year
*/
public void setYear(Integer year) {
this.year = year;
}

/**
* @param month
* set month
*/
public void setMonth(Integer month) {
this.month = month;
}

/**
* @param day
* set day
*/
public void setDay(Integer day) {
this.day = day;
}

/**
* @param salary
* set salary
*/
public void setSalary(double salary) {
this.salary = salary;
}

/**
* @return clazz
*/
public String getClazz() {
return clazz;
}

/**
* @param clazz
* set clazz
*/
public void setClazz(String clazz) {
this.clazz = clazz;
}

@Override
public String toString() {
return "Employee [name=" + name + ", clazz=" + clazz + ", year=" + year + ", month=" + month
+ ", day=" + day + ", salary=" + salary + "]";
}

}

工具类

package job.util;

import java.io.FileOutputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import org.apache.poi.hssf.usermodel.HSSFCell;
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.ss.util.CellRangeAddress;
/**
*
* @className ExportExcel
* @deprecated List集合导出成Excel表格工具类
* @author pengfei.xiong
* @date 2017年10月9日
*/
public final class ExportExcel {
/***
* 构造方法
*/
private ExportExcel() {

}

/***
* 工作簿
*/
private static HSSFWorkbook workbook;

/***
* sheet
*/
private static HSSFSheet sheet;
/***
* 标题行开始位置
*/
private static final int TITLE_START_POSITION = 0;

/***
* 时间行开始位置
*/
private static final int DATEHEAD_START_POSITION = 1;

/***
* 表头行开始位置
*/
private static final int HEAD_START_POSITION = 2;

/***
* 文本行开始位置
*/
private static final int CONTENT_START_POSITION = 3;

/**
*
* @param dataList
* 对象集合
* @param titleMap
* 表头信息（对象属性名称->要显示的标题值)[按顺序添加]
* @param sheetName
* sheet名称和表头值
*/
public static void excelExport(List<?> dataList, Map<String, String> titleMap, String sheetName) {
// 初始化workbook
initHSSFWorkbook(sheetName);
// 标题行
createTitleRow(titleMap, sheetName);
// 时间行
createDateHeadRow(titleMap);
// 表头行
createHeadRow(titleMap);
// 文本行
createContentRow(dataList, titleMap);
//设置自动伸缩
//autoSizeColumn(titleMap.size());
// 写入处理结果
try {
//生成UUID文件名称
//UUID是指在一台机器上生成的数字，它保证对在同一时空中的所有机器都是唯一的。
UUID uuid = UUID.randomUUID();
String filedisplay = uuid+".xls";
//如果web项目，1、设置下载框的弹出（设置response相关参数)；2、通过httpservletresponse.getOutputStream()获取
OutputStream out = new FileOutputStream("D:\\" + filedisplay);
workbook.write(out);
out.close();
}
catch (Exception e) {
e.printStackTrace();
}
}

/***
*
* @param sheetName
* sheetName
*/
private static void initHSSFWorkbook(String sheetName) {
workbook = new HSSFWorkbook();
sheet = workbook.createSheet(sheetName);
}

/**
* 生成标题（第零行创建）
* @param titleMap 对象属性名称->表头显示名称
* @param sheetName sheet名称
*/
private static void createTitleRow(Map<String, String> titleMap, String sheetName) {
CellRangeAddress titleRange = new CellRangeAddress(0, 0, 0, titleMap.size() - 1);
sheet.addMergedRegion(titleRange);
HSSFRow titleRow = sheet.createRow(TITLE_START_POSITION);
HSSFCell titleCell = titleRow.createCell(0);
titleCell.setCellValue(sheetName);
}

/**
* 创建时间行（第一行创建）
* @param titleMap 对象属性名称->表头显示名称
*/
private static void createDateHeadRow(Map<String, String> titleMap) {
CellRangeAddress dateRange = new CellRangeAddress(1, 1, 0, titleMap.size() - 1);
sheet.addMergedRegion(dateRange);
HSSFRow dateRow = sheet.createRow(DATEHEAD_START_POSITION);
HSSFCell dateCell = dateRow.createCell(0);
dateCell.setCellValue(new SimpleDateFormat("yyyy年MM月dd日").format(new Date()));
}

/**
* 创建表头行（第二行创建）
* @param titleMap 对象属性名称->表头显示名称
*/
private static void createHeadRow(Map<String, String> titleMap) {
// 第1行创建
HSSFRow headRow = sheet.createRow(HEAD_START_POSITION);
int i = 0;
for (String entry : titleMap.keySet()) {
HSSFCell headCell = headRow.createCell(i);
headCell.setCellValue(titleMap.get(entry));
i++;
}
}

/**
*
* @param dataList 对象数据集合
* @param titleMap 表头信息
*/
private static void createContentRow(List<?> dataList, Map<String, String> titleMap) {
try {
int i=0;
for (Object obj : dataList) {
HSSFRow textRow = sheet.createRow(CONTENT_START_POSITION + i);
int j = 0;
for (String entry : titleMap.keySet()) {
String method = "get" + entry.substring(0, 1).toUpperCase() + entry.substring(1);
Method m = obj.getClass().getMethod(method, null);
String value = m.invoke(obj, null).toString();
HSSFCell textcell = textRow.createCell(j);
textcell.setCellValue(value);
j++;
}
i++;
}

}
catch (Exception e) {
e.printStackTrace();
}
}
/**
* 自动伸缩列（如非必要，请勿打开此方法，耗内存）
* @param size 列数
*/
private static void autoSizeColumn(Integer size) {
for (int j = 0; j < size; j++) {
sheet.autoSizeColumn(j);
}
}
}

测试类

package job.util;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

public class Test {

public static void main(String[] args) {
/**模拟数据开始*/
List<Employee> staffs = new ArrayList<Employee>();
staffs.add(new Employee("test01", "一组", 2017, 9, 20, 20000));
staffs.add(new Employee("test02", "一组", 2017, 9, 20, 20000));
staffs.add(new Employee("test03", "一组", 2017, 9, 20, 20000));
staffs.add(new Employee("test04", "一组", 2017, 9, 20, 20000));
staffs.add(new Employee("test05", "一组", 2017, 9, 20, 20000));

Map<String,String> titleMap = new LinkedHashMap<String,String>();
titleMap.put("name", "姓名");
titleMap.put("clazz", "组号");
titleMap.put("year", "年份");
titleMap.put("month", "月份");
titleMap.put("day", "天");
titleMap.put("salary", "薪资");
String sheetName = "信息导出";
/**模拟数据结束*/

System.out.println("start导出");
long start = System.currentTimeMillis();
ExportExcel.excelExport(staffs, titleMap, sheetName);
long end = System.currentTimeMillis();
System.out.println("end导出");
System.out.println("耗时："+(end-start)+"ms");
}
}

作者：那一抹大伤感
来源：CSDN
原文：https://blog.csdn.net/xpf_user/article/details/78180974
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