Java导出报表
1.场景描述
使用java实现导出excel报表。使用Apache POI。
Apache POI是Apache软件基金会的开源项目，POI提供API给Java程序对Microsoft Office格式档案读和写的功能。
2.Maven依赖
org.apache.poi
poi
3.9
org.apache.poi
poi-ooxml
3.9
commons-lang
commons-lang
2.3
3.代码编写
3.1导出报表类
import com.nnkc.util.ExcelUtil;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;
/**
*功能描述：导出报表
*/
public class ReportExcel {
/**
* 功能: Excel导出公共方法
* 记录条数大于50000时 导出.xlsx文件(excel07+) 小于等于50000时导出 .xls文件(excel97-03)
* 开发：wangkecheng
* @param list 需要导出的列表数据
* @param title 导出文件的标题
* @param className 导出对象的类名
* @param exportType 针对同一个pojo可能有多个不同的导出模板时,可以通过此属性来决定导出哪一套模板，默认第一套
* @param response 用来获取输出流
* @param request 针对火狐浏览器导出时文件名乱码的问题,也可以不传入此值
* @throws IOException
*/
public void excelExport(List list, String title, Class className, Integer exportType, HttpServletResponse response, HttpServletRequest request) throws IOException {
OutputStream out = response.getOutputStream();
try {
ExcelUtil excel = new ExcelUtil();
if(list!=null && list.size()>ExcelUtil.EXPORT_07_LEAST_SIZE){
dealBigNumber(list, title, className, exportType, response, request, out, excel);
}else{
HSSFWorkbook hss = new HSSFWorkbook();
if(exportType==null){
hss = excel.exportExcel(list,title,className,0);
}else{
hss = excel.exportExcel(list, title, className, exportType);
}
String disposition = "attachment;filename=";
if(request!=null&&request.getHeader("USER-AGENT")!=null&& StringUtils.contains(request.getHeader("USER-AGENT"), "Firefox")){
disposition += new String((title+".xls").getBytes(),"ISO8859-1");
}else{
disposition += URLEncoder.encode(title+".xls", "UTF-8");
}
response.setContentType("application/vnd.ms-excel;charset=UTF-8");
response.setHeader("Content-disposition", disposition);
hss.write(out);
}
} catch (Exception e) {
System.out.println(e.getMessage());
} finally {
out.close();
}
}
private void dealBigNumber(List list, String title, Class className, Integer exportType,
HttpServletResponse response, HttpServletRequest request, OutputStream out, ExcelUtil excel)
throws Exception{
SXSSFWorkbook hss;
if(exportType==null){
hss = excel.exportExcel07S(list,title,className,0);
}else{
hss = excel.exportExcel07S(list, title, className, exportType);
}
String disposition = "attachment;filename=";
if(request!=null && request.getHeader("USER-AGENT") != null && StringUtils.contains(request.getHeader("USER-AGENT"), "Firefox")){
disposition += new String((title+".xlsx").getBytes(),"ISO8859-1");
}else{
disposition += URLEncoder.encode(title+".xlsx", "UTF-8");
}
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=UTF-8");
response.setHeader("Content-disposition", disposition);
hss.write(out);
}
}
3.2工具类
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* excel工具类
* @author wangkecheng
* @param
*/
public class ExcelUtil {
public static final int EXPORT_07_LEAST_SIZE = 50000;
/**
* 功能 :获取表单导出数据
* 开发：wangkecheng
* @param list 数据列表
* @param title 首行标题
* @param className 实体对象class
* @param exportType 模板标号
* @return
* @throws Exception
*/
public HSSFWorkbook exportExcel(List list, String title, Class className,Integer exportType) throws Exception {
// 获取属性
Field[] fields = className.getDeclaredFields();
List fieldList = new ArrayList();
for (Field fie : fields) {
if (fie.isAnnotationPresent(ExcelAnnotation.class)) {
fieldList.add(fie);
}
}
// 按照id进行排序
Collections.sort(fieldList, new Comparator() {
public int compare(Field f1, Field f2) {
return f1.getAnnotation(ExcelAnnotation.class).id() - f2.getAnnotation(ExcelAnnotation.class).id();
}
});
int columnsize = fieldList.size(), rowindex = 0;
// 创建一个HSSFWorbook对象（excel的文档对象）
HSSFWorkbook hWorkbook = new HSSFWorkbook();
// 创建一个HSSFSheet对象（excll的表单）
HSSFSheet hSheet = hWorkbook.createSheet();
// 创建行（excel的行）
HSSFRow hRow = hSheet.createRow(rowindex++);
//设置行高度
hRow.setHeight((short)380);
// 创建单元格（从0开始）
HSSFCell hCell = hRow.createCell((short) 0);
//样式对象
HSSFCellStyle cellStyle = getCellStyle(hWorkbook, (short) 300, (short) 500);
// 将上面获得的样式对象给对应单元格
hCell.setCellStyle(cellStyle);
//设置标题行
hCell.setCellValue(title);
if (getHuoResult(fieldList.isEmpty(),list == null,list.isEmpty())) {
return hWorkbook;
}
//创建第二行，代表列名
hRow = hSheet.createRow(rowindex++);
cellStyle = getCellStyle(hWorkbook, (short) 270, (short) 500);
generateTitle(exportType, fieldList, columnsize, hSheet, hRow, cellStyle);
//组装excel的数据
cellStyle = getCellStyle(hWorkbook, (short) 220, (short) 500);// 设置单元格格式
generateData(list, fieldList, columnsize, rowindex, hSheet, cellStyle);
/**
* 第1个参数：从哪一行开始
* 第2个参数：到哪一行结束
* 第3个参数：从哪一列开始
* 第4个参数：到哪一列结束
*/
hSheet.addMergedRegion(new CellRangeAddress(0,0,0,columnsize-1));
// 固定表头（前一个参数代表列，后一个参数单表行）
hSheet.createFreezePane(0, 1);
return hWorkbook;
}
/**
* 功能：組裝列明
* @param exportType 模板编号
* @param fieldList 列名
* @param columnsize 列数
* @param hSheet sheet页
* @param hRow 行
* @param cellStyle 样式
*/
private void generateTitle(Integer exportType, List fieldList, int columnsize, HSSFSheet hSheet, HSSFRow hRow,
HSSFCellStyle cellStyle) {
HSSFCell hCell;
for (int i = 0; i < columnsize; i++) {
Field field = fieldList.get(i);
if (field.isAnnotationPresent(ExcelAnnotation.class)) {
// 获取该字段的注解对象
ExcelAnnotation anno = field.getAnnotation(ExcelAnnotation.class);
hCell = hRow.createCell((short) i);
String colName = field.getAnnotation(ExcelAnnotation.class).name().length>exportType
?field.getAnnotation(ExcelAnnotation.class).name()[exportType]
:field.getAnnotation(ExcelAnnotation.class).name()[0];
hCell.setCellValue(colName);
hCell.setCellStyle(cellStyle);
hSheet.setColumnWidth((short) i, (short) anno.width());
}
}
}
/**
* 组装excel的数据
* @param list 具体数据
* @param fieldList 列名
* @param columnsize 列数
* @param rowindex 行数计数
* @param hSheet sheet页
* @param cellStyle 样式
* @return
* @throws NoSuchMethodException
* @throws IllegalAccessException
* @throws InvocationTargetException
*/
private int generateData(List list, List fieldList, int columnsize, int rowindex, HSSFSheet hSheet,
HSSFCellStyle cellStyle) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
HSSFRow hRow;
HSSFCell hCell;
for (Object model : list) {
hRow = hSheet.createRow(rowindex++);
//获取该类
Class clazz = model.getClass();
for (int i = 0; i < columnsize; i++) {
Field field =fieldList.get(i);
//获取方法名
String methodName = "get" + field.getName().substring(0, 1).toUpperCase()+field.getName().substring(1);
Method method = clazz.getMethod(methodName);
try {
// 获取该字段的注解对象
Object result = method.invoke(model);
hCell = hRow.createCell((short) i);
if (result != null) {
if (result.getClass().isAssignableFrom(Date.class)) {
SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日");
result = format.format(result);
}
hCell.setCellValue(new HSSFRichTextString(result.toString()));
} else {
hCell.setCellValue(new HSSFRichTextString("-"));
}
hCell.setCellStyle(cellStyle);
} catch (IllegalArgumentException e) {
System.out.println(e.getMessage());
}
}
}
return rowindex;
}
/**
* 生成07格式的excel对象 使用流方式防止内存溢出
* @param list
* @param title
* @param className
* @param exportType
* @return
* @throws Exception
*/
public SXSSFWorkbook exportExcel07S(List list, String title, Class className,Integer exportType) throws Exception {
// 获取属性
Field[] fields = className.getDeclaredFields();
List fieldList = new ArrayList();
for (Field fie : fields) {
if (fie.isAnnotationPresent(ExcelAnnotation.class)){
fieldList.add(fie);
}
}
// 按照id进行排序
Collections.sort(fieldList, new Comparator() {
public int compare(Field f1, Field f2) {
return f1.getAnnotation(ExcelAnnotation.class).id() - f2.getAnnotation(ExcelAnnotation.class).id();
}
});
int columnsize = fieldList.size(), rowindex = 0;
// 创建一个HSSFWorbook对象s
SXSSFWorkbook hWorkbook = new SXSSFWorkbook();
// 创建一个HSSFSheet对象（sheet页）
Sheet hSheet = hWorkbook.createSheet();
// 创建第一行(此行作为头)
Row hRow = hSheet.createRow(rowindex++);
hRow.setHeight((short)380);
// 创建单元格（第一（0）个）
Cell hCell = hRow.createCell((short) 0);
// 设置样式
CellStyle cellStyle = getCellStyle07S(hWorkbook, (short) 300, (short) 500);
// 将上面获得的样式对象给对应单元格
hCell.setCellStyle(cellStyle);
//设置标题行
hCell.setCellValue(title);
if (getHuoResult(fieldList.isEmpty(),list == null,list.isEmpty())) {
return hWorkbook;
}
// 创建第二列，列名
hRow = hSheet.createRow(rowindex++);
cellStyle = getCellStyle07S(hWorkbook, (short) 270, (short) 500);
createTitle07S(exportType, fieldList, columnsize, hSheet, hRow, cellStyle);
//生成数据
cellStyle = getCellStyle07S(hWorkbook, (short) 220, (short) 500);// 设置单元格格式
dealCreateRow07S(list, fieldList, columnsize, rowindex, hSheet, cellStyle);
/**
* 第1个参数：从哪一行开始
* 第2个参数：到哪一行结束
* 第3个参数：从哪一列开始
* 第4个参数：到哪一列结束
*/
hSheet.addMergedRegion(new CellRangeAddress(0,0,0,columnsize-1));
// 固定表头（前一个参数代表列，后一个参数单表行）
hSheet.createFreezePane(0, 1);
return hWorkbook;
}
private int dealCreateRow07S(List list, List fieldList, int columnsize, int rowindex, Sheet hSheet,
CellStyle cellStyle) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
Row hRow;
Cell hCell;
for (Object model : list) {
hRow = hSheet.createRow(rowindex++);
// 获取该类 并获取自身方法
Class clazz = model.getClass();
for (int i = 0; i < columnsize; i++) {
Field field = fieldList.get(i);
String methodName = "get" + field.getName().substring(0, 1).toUpperCase()
+ field.getName().substring(1);
Method method = clazz.getMethod(methodName);
try {
// 获取该字段的注解对象
Object result = method.invoke(model);
hCell = hRow.createCell((short) i);
if (result != null) {
if (result.getClass().isAssignableFrom(Date.class)) {
SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日");
result = format.format(result);
}
hCell.setCellValue(new XSSFRichTextString(result.toString()));
} else {
hCell.setCellValue(new XSSFRichTextString("-"));
}
hCell.setCellStyle(cellStyle);
} catch (IllegalArgumentException e) {
System.out.println(e.getMessage());
}
}
}
return rowindex;
}
/**
* 生成列名
* @param exportType 模板编号
* @param fieldList 列名
* @param columnsize 列数
* @param hSheet
* @param hRow
* @param cellStyle
*/
private void createTitle07S(Integer exportType, List fieldList, int columnsize, Sheet hSheet, Row hRow,
CellStyle cellStyle) {
Cell hCell;
for (int i = 0; i < columnsize; i++) {
Field field = (Field) fieldList.get(i);
if (field.isAnnotationPresent(ExcelAnnotation.class)) {
// 获取该字段的注解对象
ExcelAnnotation anno = field.getAnnotation(ExcelAnnotation.class);
hCell = hRow.createCell((short) i);
String colName = field.getAnnotation(ExcelAnnotation.class).name().length>exportType
?field.getAnnotation(ExcelAnnotation.class).name()[exportType]
:field.getAnnotation(ExcelAnnotation.class).name()[0];
hCell.setCellValue(colName);
hCell.setCellStyle(cellStyle);
hSheet.setColumnWidth((short) i, (short) anno.width());
}
}
}
/**
* 功能 :设置excel表格默认样式
* @param hWorkbook 需导出Excel数据
* @param fontHeight 字体粗度
* @param boldWeight 表格线的粗度
* @return
*/
public HSSFCellStyle getCellStyle(HSSFWorkbook hWorkbook, short fontHeight, short boldWeight) {
HSSFCellStyle cellStyle;
HSSFFont font;
cellStyle = hWorkbook.createCellStyle();
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
cellStyle.setTopBorderColor(HSSFColor.BLACK.index);
cellStyle.setLeftBorderColor(HSSFColor.BLACK.index);
cellStyle.setRightBorderColor(HSSFColor.BLACK.index);
cellStyle.setBottomBorderColor(HSSFColor.BLACK.index);
font = hWorkbook.createFont();
font.setFontHeight(fontHeight);
font.setBoldweight(boldWeight);
font.setFontName("宋体");
cellStyle.setFont(font);
cellStyle.setWrapText(true);
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
return cellStyle;
}
/**
* 功能 :设置excel 07表格默认样式
* @param hWorkbook 需导出Excel数据
* @param fontHeight 字体粗度
* @param boldWeight 表格线的粗度
* @return
*/
public CellStyle getCellStyle07S(SXSSFWorkbook hWorkbook, short fontHeight, short boldWeight) {
CellStyle cellStyle;
Font font;
cellStyle = hWorkbook.createCellStyle();
cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
cellStyle.setTopBorderColor(HSSFColor.BLACK.index);
cellStyle.setLeftBorderColor(HSSFColor.BLACK.index);
cellStyle.setRightBorderColor(HSSFColor.BLACK.index);
cellStyle.setBottomBorderColor(HSSFColor.BLACK.index);
font = hWorkbook.createFont();
font.setFontHeight(fontHeight);
font.setBoldweight(boldWeight);
font.setFontName("宋体");
cellStyle.setFont(font);
cellStyle.setWrapText(true);
cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
return cellStyle;
}
/*
* 获取或运算结果
*/
private static boolean getHuoResult(Boolean... bs){
for(boolean b:bs){
if(b){
return b;
}
}
return false;
}
} 
3.3注解类
import java.lang.annotation.*;
/**
*
* 功能：excel模板设置
*
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface ExcelAnnotation {
//Excel列ID(Excel列排序序号)
int id();
//Excel列名
String[] name();
//Excel列宽
int width() default 5000;
}
3.4pojo对象
import com.nnkc.util.ExcelAnnotation;
import java.util.Date;
/**
* Created by chengcheng on 2017/12/5.
*/
public class Product {
@ExcelAnnotation(id=1,name={"产品名称","商品名称"},width = 5000)
private String name;
@ExcelAnnotation(id=2,name={"产品价格","商品价格"},width = 5000)
private double price;
@ExcelAnnotation(id=3,name={"生产日期"},width = 5000)
private Date date;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
}
3.5测试类
import com.nnkc.pojo.Product;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* Created by chengcheng on 2017/12/5.
*/
public class ReportExcelTest extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("调用成功");
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
List list = new ArrayList();
for (int i = 0 ; i<60000 ; i++) {
//组装测试数据
Product product = new Product();
product.setName("爱奇艺会员"+i);
product.setPrice(9.99);
product.setDate(new Date());
list.add(product);
}
ReportExcel reportExcel = new ReportExcel();
reportExcel.excelExport(list,"测试",Product.class,1,resp,req);
}
}
3.5测试结果
