导出excel封装

你只要这么调用就能导出 ,ExportExcel是个封装的工具类

new ExportExcel(title, Notice.class).setDataList(list).write(response, request, title+new Date().getTime()+".xlsx").dispose();

//title标题，Notice实体类，list导出列表，title+new Date().getTime()+".xlsx"这个是文件名称加后缀

当然你的实体类字段还得加上这个东西如下事件类型就是excel标题

    @ExcelField(title = "事件类型")
    private String recordTypeName;//安全事件类型字符串

/**

 * Copyright &copy; 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
 */
package com.chinagdn.base.common.excel;


import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Comment;
import org.apache.poi.ss.usermodel.DataFormat;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import com.chinagdn.base.common.excel.annotation.ExcelField;
import com.chinagdn.base.common.utils.Encodes;
import com.chinagdn.base.common.utils.Reflections;




/**
 * 导出Excel文件（导出“XLSX”格式，支持大数据量导出   @see org.apache.poi.ss.SpreadsheetVersion）
 * @author ThinkGem
 * @version 2013-04-21
 */
public class ExportExcel {

private static Logger log = LoggerFactory.getLogger(ExportExcel.class);

/**
* 工作薄对象
*/
private SXSSFWorkbook wb;

/**
* 工作表对象
*/
private Sheet sheet;

/**
* 样式列表
*/
private Map<String, CellStyle> styles;

/**
* 当前行号
*/
private int rownum;

/**
* 注解列表（Object[]{ ExcelField, Field/Method }）
*/
List<Object[]> annotationList = new ArrayList<Object[]>();

/**
* 构造函数
* @param title 表格标题，传“空值”，表示无标题
* @param cls 实体对象，通过annotation.ExportField获取标题
*/
public ExportExcel(String title, Class<?> cls){
this(title, cls, 1);
}

/**
* 构造函数
* @param title 表格标题，传“空值”，表示无标题
* @param cls 实体对象，通过annotation.ExportField获取标题
* @param type 导出类型（1:导出数据；2：导出模板）
* @param groups 导入分组
*/
public ExportExcel(String title, Class<?> cls, int type, int... groups){
// Get annotation field 
Field[] fs = cls.getDeclaredFields();
for (Field f : fs){
ExcelField ef = f.getAnnotation(ExcelField.class);
if (ef != null && (ef.type()==0 || ef.type()==type)){
if (groups!=null && groups.length>0){
boolean inGroup = false;
for (int g : groups){
if (inGroup){
break;
}
for (int efg : ef.groups()){
if (g == efg){
inGroup = true;
annotationList.add(new Object[]{ef, f});
break;
}
}
}
}else{
annotationList.add(new Object[]{ef, f});
}
}
}
// Get annotation method
Method[] ms = cls.getDeclaredMethods();
for (Method m : ms){
ExcelField ef = m.getAnnotation(ExcelField.class);
if (ef != null && (ef.type()==0 || ef.type()==type)){
if (groups!=null && groups.length>0){
boolean inGroup = false;
for (int g : groups){
if (inGroup){
break;
}
for (int efg : ef.groups()){
if (g == efg){
inGroup = true;
annotationList.add(new Object[]{ef, m});
break;
}
}
}
}else{
annotationList.add(new Object[]{ef, m});
}
}
}
// Field sorting
Collections.sort(annotationList, new Comparator<Object[]>() {
public int compare(Object[] o1, Object[] o2) {
return new Integer(((ExcelField)o1[0]).sort()).compareTo(
new Integer(((ExcelField)o2[0]).sort()));
};
});
// Initialize
List<String> headerList = new ArrayList<String>();
for (Object[] os : annotationList){
String t = ((ExcelField)os[0]).title();
// 如果是导出，则去掉注释
if (type==1){
String[] ss = StringUtils.split(t, "**", 2);
if (ss.length==2){
t = ss[0];
}
}
headerList.add(t);
}
initialize(title, headerList);
}

/**
* 构造函数
* @param title 表格标题，传“空值”，表示无标题
* @param headers 表头数组
*/
public ExportExcel(String title, String[] headers) {
initialize(title,  Arrays.asList(headers));
}

/**
* 构造函数
* @param title 表格标题，传“空值”，表示无标题
* @param headerList 表头列表
*/
public ExportExcel(String title, List<String> headerList) {
initialize(title, headerList);
}

/**
* 初始化函数
* @param title 表格标题，传“空值”，表示无标题
* @param headerList 表头列表
*/
private void initialize(String title, List<String> headerList) {
this.wb = new SXSSFWorkbook(500);
this.sheet = wb.createSheet("Export");
this.styles = createStyles(wb);
// Create title
if (StringUtils.isNotBlank(title)){
Row titleRow = sheet.createRow(rownum++);
titleRow.setHeightInPoints(30);
Cell titleCell = titleRow.createCell(0);
titleCell.setCellStyle(styles.get("title"));
titleCell.setCellValue(title);
sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(),
titleRow.getRowNum(), titleRow.getRowNum(), headerList.size()-1));
}
// Create header
if (headerList == null){
throw new RuntimeException("headerList not null!");
}
Row headerRow = sheet.createRow(rownum++);
headerRow.setHeightInPoints(16);
for (int i = 0; i < headerList.size(); i++) {
Cell cell = headerRow.createCell(i);
cell.setCellStyle(styles.get("header"));
String[] ss = StringUtils.split(headerList.get(i), "**", 2);
if (ss.length==2){
cell.setCellValue(ss[0]);
Comment comment = this.sheet.createDrawingPatriarch().createCellComment(
new XSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6));
comment.setString(new XSSFRichTextString(ss[1]));
cell.setCellComment(comment);
}else{
cell.setCellValue(headerList.get(i));
}
sheet.autoSizeColumn(i);
}
for (int i = 0; i < headerList.size(); i++) {  
int colWidth = sheet.getColumnWidth(i)*2;
       sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth);  
}
log.debug("Initialize success.");
}

/**
* 创建表格样式
* @param wb 工作薄对象
* @return 样式列表
*/
private Map<String, CellStyle> createStyles(Workbook wb) {
Map<String, CellStyle> styles = new HashMap<String, CellStyle>();

CellStyle style = wb.createCellStyle();
style.setAlignment(CellStyle.ALIGN_CENTER);
style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
Font titleFont = wb.createFont();
titleFont.setFontName("Arial");
titleFont.setFontHeightInPoints((short) 16);
titleFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
style.setFont(titleFont);
styles.put("title", style);


style = wb.createCellStyle();
style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
style.setBorderRight(CellStyle.BORDER_THIN);
style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setBorderLeft(CellStyle.BORDER_THIN);
style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setBorderTop(CellStyle.BORDER_THIN);
style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setBorderBottom(CellStyle.BORDER_THIN);
style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
Font dataFont = wb.createFont();
dataFont.setFontName("Arial");
dataFont.setFontHeightInPoints((short) 10);
style.setFont(dataFont);
styles.put("data", style);

style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
style.setAlignment(CellStyle.ALIGN_LEFT);
styles.put("data1", style);


style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
style.setAlignment(CellStyle.ALIGN_CENTER);
styles.put("data2", style);


style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
style.setAlignment(CellStyle.ALIGN_RIGHT);
styles.put("data3", style);

style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
// style.setWrapText(true);
style.setAlignment(CellStyle.ALIGN_CENTER);
style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setFillPattern(CellStyle.SOLID_FOREGROUND);
Font headerFont = wb.createFont();
headerFont.setFontName("Arial");
headerFont.setFontHeightInPoints((short) 10);
headerFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
headerFont.setColor(IndexedColors.WHITE.getIndex());
style.setFont(headerFont);
styles.put("header", style);

return styles;
}


/**
* 添加一行
* @return 行对象
*/
public Row addRow(){
return sheet.createRow(rownum++);
}



/**
* 添加一个单元格
* @param row 添加的行
* @param column 添加列号
* @param val 添加值
* @return 单元格对象
*/
public Cell addCell(Row row, int column, Object val){
return this.addCell(row, column, val, 0, Class.class);
}

/**
* 添加一个单元格
* @param row 添加的行
* @param column 添加列号
* @param val 添加值
* @param align 对齐方式（1：靠左；2：居中；3：靠右）
* @return 单元格对象
*/
public Cell addCell(Row row, int column, Object val, int align, Class<?> fieldType){
Cell cell = row.createCell(column);
CellStyle style = styles.get("data"+(align>=1&&align<=3?align:""));
try {
if (val == null){
cell.setCellValue("");
} else if (val instanceof String) {
cell.setCellValue((String) val);
} else if (val instanceof Integer) {
cell.setCellValue((String) val);
} else if (val instanceof Long) {
cell.setCellValue((Long) val);
} else if (val instanceof Double) {
cell.setCellValue((Double) val);
} else if (val instanceof Float) {
cell.setCellValue((Float) val);
} else if (val instanceof Date) {
DataFormat format = wb.createDataFormat();
           style.setDataFormat(format.getFormat("yyyy-MM-dd"));
cell.setCellValue((Date) val);
} else {
if (fieldType != Class.class){
cell.setCellValue((String)fieldType.getMethod("setValue", Object.class).invoke(null, val));
}else{
cell.setCellValue((String)Class.forName(this.getClass().getName().replaceAll(this.getClass().getSimpleName(), 
"fieldtype."+val.getClass().getSimpleName()+"Type")).getMethod("setValue", Object.class).invoke(null, val));
}
}
} catch (Exception ex) {
log.info("Set cell value ["+row.getRowNum()+","+column+"] error: " + ex.toString());
cell.setCellValue(val.toString());
}
cell.setCellStyle(style);
return cell;
}


/**
* 添加数据（通过annotation.ExportField添加数据）
* @return list 数据列表
*/
public <E> ExportExcel setDataList(List<E> list){
for (E e : list){
int colunm = 0;
Row row = this.addRow();
StringBuilder sb = new StringBuilder();
for (Object[] os : annotationList){
ExcelField ef = (ExcelField)os[0];
Object val = null;
// Get entity value
try{
if (StringUtils.isNotBlank(ef.value())){
val = Reflections.invokeGetter(e, ef.value());
}else{
if (os[1] instanceof Field){
val = Reflections.invokeGetter(e, ((Field)os[1]).getName());
}else if (os[1] instanceof Method){
val = Reflections.invokeMethod(e, ((Method)os[1]).getName(), new Class[] {}, new Object[] {});
}
}
// If is dict, get dict label
/*if (StringUtils.isNotBlank(ef.dictType())){
val = DictUtils.getDictLabel(val==null?"":val.toString(), ef.dictType(), "");
}*/
}catch(Exception ex) {
// Failure to ignore
log.info(ex.toString());
val = "";
}
this.addCell(row, colunm++, val, ef.align(), ef.fieldType());
sb.append(val + ", ");
}
log.debug("Write success: ["+row.getRowNum()+"] "+sb.toString());
}
return this;
}

/**
* 输出数据流
* @param os 输出数据流
*/
public ExportExcel write(OutputStream os) throws IOException{
wb.write(os);
return this;
}

/**
* 输出到客户端
* @param fileName 输出文件名
*/
public ExportExcel write(HttpServletResponse response,HttpServletRequest request, String fileName) throws IOException{
        String userAgent = request.getHeader("User-Agent");
        if (null != userAgent) {
            userAgent = userAgent.toLowerCase();
            //火狐浏览器
            if (userAgent.indexOf("firefox") != -1) {
                fileName = new String(fileName.getBytes(), "ISO-8859-1");
            } else {
                fileName = URLEncoder.encode(fileName, "UTF-8");
            }
        } else {
            fileName = URLEncoder.encode(fileName, "UTF-8");
        }
response.reset();
        response.setContentType("application/octet-stream; charset=utf-8");
        response.setHeader("Content-Disposition", "attachment; filename="+fileName);
write(response.getOutputStream());
return this;
}
    /**
     * 输出到客户端
     * @param fileName 输出文件名
     */
    public ExportExcel write(HttpServletResponse response, String fileName) throws IOException{
        response.reset();
        response.setContentType("application/octet-stream; charset=utf-8");
        response.setHeader("Content-Disposition", "attachment; filename="+Encodes.urlEncode(fileName));
        write(response.getOutputStream());
        return this;
    }

/**
* 输出到文件
* @param fileName 输出文件名
*/
public ExportExcel writeFile(String name) throws FileNotFoundException, IOException{
FileOutputStream os = new FileOutputStream(name);
this.write(os);
return this;
}

/**
* 清理临时文件
*/
public ExportExcel dispose(){
wb.dispose();
return this;
}

// /**
// * 导出测试
// */
// public static void main(String[] args) throws Throwable {
//
// List<String> headerList = Lists.newArrayList();
// for (int i = 1; i <= 10; i++) {
// headerList.add("表头"+i);
// }
//
// List<String> dataRowList = Lists.newArrayList();
// for (int i = 1; i <= headerList.size(); i++) {
// dataRowList.add("数据"+i);
// }
//
// List<List<String>> dataList = Lists.newArrayList();
// for (int i = 1; i <=1000000; i++) {
// dataList.add(dataRowList);
// }
//
// ExportExcel ee = new ExportExcel("表格标题", headerList);
//
// for (int i = 0; i < dataList.size(); i++) {
// Row row = ee.addRow();
// for (int j = 0; j < dataList.get(i).size(); j++) {
// ee.addCell(row, j, dataList.get(i).get(j));
// }
// }
//
// ee.writeFile("target/export.xlsx");
//
// ee.dispose();
//
// log.debug("Export success.");
//
// }


}