java導出excel支持2003、2007及SAX解析

java poi導出excel 工具，支持配置SAX導出模式以及導出excel 2003、excel 2007

首先是一個註解類

package com.wl.farmer.action.annotaion;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Created by Administrator on 2019/9/26.
 */
@Target({ElementType.FIELD,ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface ExportAnnotation {

    int order() default 100;//排序（屬性對應excel的列 的列數）
    String method() default "";//屬性對應的get方法
    //導出title
    String columnTitle() default "";//屬性對應的excel 的title
    //title數組長度
    int length() default 20;//列的個數

}

導出的實體對象 javaBean(例子)

package com.wl.farmer.action.model;


import com.wl.farmer.action.annotaion.ExportAnnotation;
import com.wl.farmer.action.util.ExportExcelUtil;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.Date;

/**
 * Created by wl
 */
@ExportAnnotation(length = 9)
public class User {

    @ExportAnnotation(order = 1,method = "getId",columnTitle = "用戶id")
    private Integer id;

    @ExportAnnotation(order = 2,method = "getUserName",columnTitle = "用戶名稱")
    private String userName;

    @ExportAnnotation(order = 3,method = "getMobile",columnTitle = "電話號碼")
    private String mobile;

    @ExportAnnotation(order = 4,method = "getEmail",columnTitle = "電子郵箱")
    private String email;

    @ExportAnnotation(order = 5,method = "getAge",columnTitle = "年齡")
    private Integer age;

    @ExportAnnotation(order = 5,method = "getCreateTime",columnTitle = "創建時間")
    private Date createTime;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Integer getAge() {
        return age;
    }

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

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }
    
}

真正的工具類

package com.wl.farmer.action.util;

import com.wl.farmer.action.annotaion.ExportAnnotation;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Created by wl
 */
public class ExportExcelUtil{

    private static final Logger logger = LoggerFactory.getLogger(ExportExcelUtil.class);

    private final Workbook wbk;

    private Sheet sheet;

    private Row row;

    private Cell cell;

    private final CellStyle titleStyle;

    private final CellStyle cellStyle;

    private Object cellValue;

    //標題[0][]   方法名[1][]
    private final String[][] titlesAndMethods = new String[2][];

    private final Class<?> exportClass;

    private ExportExcelUtil(Builder builder){
        this.exportClass = builder.targetClass;
        if(builder.isSax){
            this.wbk = new SXSSFWorkbook(builder.rowAccessWindowSize);
        }else if(builder.is2003){
            this.wbk = new HSSFWorkbook();
        }else{
            this.wbk = new XSSFWorkbook();
        }
        this.titleStyle = this.wbk.createCellStyle();
        this.cellStyle = this.wbk.createCellStyle();
        //樣式
        this.initStyle(this.titleStyle,false);
        this.initStyle(this.cellStyle,true);
        this.initTitleAndMethod(this.exportClass);

    }


    private int count = 1;

    private static final int MAX_ROW_NUM_2003 = 2000 + 1;

    private static final int MAX_ROW_NUM_2007 = 20000 + 1;

    public void exportRowSet(Object rowData) {
        if(this.sheet ==null){
            throw new NullPointerException("sheet 爲空 ， 先initSheet");
        }

        if(this.wbk instanceof HSSFWorkbook){
            if(this.count % MAX_ROW_NUM_2003 == 0){
                this.initSheet(this.wbk.getSheetName(0) + (this.wbk.getSheetIndex(sheet) + 1));
            }
        }else {
            if(this.count % MAX_ROW_NUM_2007 == 0){
                this.initSheet(this.wbk.getSheetName(0) + (this.wbk.getSheetIndex(sheet) + 1));
            }
        }

        if(this.count % 10000 == 0){
            logger.info("=========="+Runtime.getRuntime().totalMemory()/1024/1024+"M");
            //System.runFinalization();
        }

        this.row = this.sheet.createRow(count);

        for(int i=0;i<titlesAndMethods[0].length && titlesAndMethods[1][i] != null;i++) {
            try {
                this.cellValue = this.exportClass.getMethod(this.titlesAndMethods[1][i]).invoke(rowData);
                this.cell = this.row.createCell(i);
                this.createCellValue(i);

            } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
                //logger.error("導出統計數據 反射獲取值 失敗,column:{}",i,e);
            }

        }
        this.count++;
    }

    public void writeWbk(OutputStream os) {
        try {
            this.wbk.write(os);
        } catch (IOException e) {
            //
        }finally {
            try {
                this.wbk.close();
                os.close();
            } catch (IOException e) {
                //
            }
        }
    }

    public void initSheet(String sheetName){
        this.sheet = this.wbk.createSheet(sheetName);
        this.sheet.setDefaultColumnWidth((short) 16);
        this.row = this.sheet.createRow(0);
        this.createRowTitle();
        this.count = 1;
    }

    private void initTitleAndMethod(Class<?> clazz) {
        ExportAnnotation exportAnnotation =  clazz.getAnnotation(ExportAnnotation.class);
        Field[] fields = clazz.getDeclaredFields();
        //初始化 標題[0][0]
        {
            //第一個title 序號
            int length = exportAnnotation.length();
            this.titlesAndMethods[0] = new String[length+1];
            this.titlesAndMethods[1] = new String[length+1];
            this.titlesAndMethods[0][0] = "序號";
        }
        int index;
        for(Field field :fields){
            exportAnnotation = field.getAnnotation(ExportAnnotation.class);
            if(exportAnnotation != null) {
                index = exportAnnotation.order();
                //標題
                this.titlesAndMethods[0][index] = exportAnnotation.columnTitle();
                this.titlesAndMethods[1][index] = exportAnnotation.method();
            }
        }
    }

    /**
     * 創建標題行
     */
    private  void createRowTitle() {
        String[] titles = titlesAndMethods[0];
        for(int i=0;i<titles.length;i++){
            this.cell = this.row.createCell(i);
            this.cell.setCellStyle(this.titleStyle);
            //每次都要實例化一個  如果爲final cellValue 全部相同    太耗內存
//            this.xssfRichTextString = new XSSFRichTextString();
//            this.xssfRichTextString.setString(titles[i]);
            this.cell.setCellValue(titles[i]);
        }
    }

    private void initStyle(CellStyle style,boolean isBold) {
        // 設置這些樣式SOLID_FOREGROUND
        style.setFillForegroundColor(HSSFColor.WHITE.index);
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        style.setBorderBottom(BorderStyle.THIN);
        style.setBorderLeft(BorderStyle.THIN);
        style.setBorderRight(BorderStyle.THIN);
        style.setBorderTop(BorderStyle.THIN);
        style.setAlignment(HorizontalAlignment.CENTER);
        // 生成一個字體
        Font font =  this.wbk.createFont();
        font.setColor(HSSFColor.BLACK.index);
        font.setFontHeightInPoints((short) 12);
        font.setBold(isBold);
        style.setFont(font);

    }

    /**
     * 創建 cell
     */
    private void createCellValue(int columnIndex){

        // 判斷值的類型後進行強制類型轉換
        String textValue = null;
        if (this.cellValue instanceof Date) {
            textValue = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format((Date) this.cellValue);
        }else if (this.cellValue instanceof byte[]) {
            Drawing patriarch = this.sheet.createDrawingPatriarch();
            // 有圖片時，設置行高爲60px;
            this.row.setHeightInPoints(60);
            // 設置圖片所在列寬度爲80px,注意這裏單位的一個換算
            this.sheet.setColumnWidth(columnIndex, (short) (35.7 * 80));
            // sheet.autoSizeColumn(i);
            byte[] bsValue = (byte[]) this.cellValue;
            ClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 255, (short) 6, columnIndex, (short) 6, columnIndex);
            anchor.setAnchorType(ClientAnchor.AnchorType.MOVE_DONT_RESIZE);
            patriarch.createPicture(anchor, this.wbk.addPicture(bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
        }else {
            // 其它數據類型都當作字符串簡單處理
            if (this.cellValue != null) textValue = this.cellValue.toString();
        }
        // 如果不是圖片數據，就判斷textValue是否全部由數字組成
        if (textValue != null) {
            this.cell.setCellStyle(this.cellStyle);
            if (this.cellValue instanceof Integer) {
                //double 強制轉換 會有小數點
                this.cell.setCellValue((int) this.cellValue);
            }else if(this.cellValue instanceof Number){
                this.cell.setCellValue((double) this.cellValue);
            }
            else {
                this.cell.setCellValue(textValue);
            }
        }
    }

    public static class Builder{

        private Class<?> targetClass;

        /**
         * 導出類型是否是excel 2003
         */
        private boolean is2003 = false;

        /**
         * 是否是Sax方式導入
         */
        private boolean isSax = false;

        private int rowAccessWindowSize = 100;



        public Class<?> getTargetClass() {
            return targetClass;
        }

        private Builder setTargetClass(Class<?> targetClass) {
            this.targetClass = targetClass;
            return this;
        }

        public Builder setIs2003(boolean is2003) {
            this.is2003 = is2003;
            return this;
        }

        public Builder setSax(boolean sax) {
            this.isSax = sax;
            return this;
        }

        public Builder setRowAccessWindowSize(int rowAccessWindowSize) {
            this.rowAccessWindowSize = rowAccessWindowSize;
            return this;
        }

        public static Builder create(Class<?> targetClass){
            if(targetClass == null){
                throw new NullPointerException();
            }
            return new Builder().setTargetClass(targetClass);
        }


        public ExportExcelUtil build(){
            if(this.isSax){
                if(this.is2003){
                    throw new UnsupportedOperationException("excel2003不支持sax解析方式");
                }
            }
            return new ExportExcelUtil(this);
        }
    }

    public String getExcelSuffix(){
        if(this.wbk instanceof HSSFWorkbook){
            return ".xls";
        }
        return ".xlsx";
    }

}

下面貼一下工具使用方法
1.實例化工具類（可以配置SAX解析）

ExportExcelUtil excelUtil = ExportExcelUtil.Builder.create(User.class).setIs2003(false).build();

2.初始化sheet

excelUtil.initSheet("用戶列表");

3.填充數據

for(int i = 0; i <1000;i++){
            User user = new User();
            user.setId(i+1);
            user.setAge(18);
            user.setCreateTime(new Date());
            user.setEmail("***@123.com");
            user.setMobile("***");
            user.setUserName("wl");
            excelUtil.exportRowSet(user);
        }

導出excel

excelUtil.writeWbk(new FileOutputStream(new File("user" + excelUtil.getExcelSuffix())));

下面是我的測試代碼（導出10萬條數據）

public static void main(String[] args) throws FileNotFoundException {
        ExportExcelUtil excelUtil = ExportExcelUtil.Builder.create(User.class).setIs2003(false).setSax(true).setRowAccessWindowSize(50000).build();
        excelUtil.initSheet("用戶列表");
        for(int i = 0; i <100000;i++){
            User user = new User();
            user.setId(i+1);
            user.setAge(18);
            user.setCreateTime(new Date());
            user.setEmail("***@123.com");
            user.setMobile("***");
            user.setUserName("wl");
            excelUtil.exportRowSet(user);
        }
        excelUtil.writeWbk(new FileOutputStream(new File("user" + excelUtil.getExcelSuffix())));
    }

打印的內存使用情況如下

Connected to the target VM, address: '127.0.0.1:60590', transport: 'socket'
22:22:38.173 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========245M
22:22:38.282 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========245M
22:22:38.345 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========245M
22:22:38.413 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========245M
22:22:38.475 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========309M
22:22:38.522 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========309M
22:22:38.569 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========309M
22:22:38.647 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========309M
22:22:38.694 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========309M
22:22:38.725 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========309M
Disconnected from the target VM, address: '127.0.0.1:60590', transport: 'socket'

下面我們不採用sax解析

public static void main(String[] args) throws FileNotFoundException {
        ExportExcelUtil excelUtil = ExportExcelUtil.Builder.create(User.class).setIs2003(false).setSax(false).build();
        excelUtil.initSheet("用戶列表");
        for(int i = 0; i <100000;i++){
            User user = new User();
            user.setId(i+1);
            user.setAge(18);
            user.setCreateTime(new Date());
            user.setEmail("***@123.com");
            user.setMobile("***");
            user.setUserName("wl");
            excelUtil.exportRowSet(user);
        }
        excelUtil.writeWbk(new FileOutputStream(new File("user" + excelUtil.getExcelSuffix())));
    }

Connected to the target VM, address: '127.0.0.1:60603', transport: 'socket'
22:24:03.762 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========448M
22:24:04.262 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========706M
22:24:04.770 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========716M
22:24:05.130 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========1024M
22:24:06.458 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========1189M
22:24:06.817 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========1317M
22:24:07.130 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========1317M
22:24:08.370 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========1785M
22:24:08.807 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========1790M
22:24:09.104 [main] INFO com.wl.farmer.action.util.ExportExcelUtil - ==========1790M
Disconnected from the target VM, address: '127.0.0.1:60603', transport: 'socket'

可以看到不僅解析緩慢，而且使用內存巨大
導出文件如下

使用模板
在工具類中加入模板代碼

public static class ExportTemplate {

        public Result executeExport(ExportCallBackHandler exportCallBackHandler) {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            try {
                //doSomething
                //回調
                return exportCallBackHandler.processExport(bos);
                //doSomething
            } catch (IOException | RuntimeException e) {
                logger.error(e.getMessage(),e);
                return Result.fail(e.getMessage());
            } finally {
                IOUtils.closeQuietly(bos);

            }
        }

        //回調接口
        public interface ExportCallBackHandler {
            Result processExport(ByteArrayOutputStream bos) throws IOException;
        }
    }

需要引入commons-io包和Result類

package com.wl.farmer.action.model;

import java.io.Serializable;

/**
 * Created by Administrator on 2019/2/20.
 */
public class Result<T> {
    private Integer code;

    private String msg;

    private T body;

    public Integer getCode() {
        return code;
    }

    private void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    private void setMsg(String msg) {
        this.msg = msg;
    }

    public T getBody() {
        return body;
    }

    private void setBody(T body) {
        this.body = body;
    }

    private static class Builder<T>{
        private Integer code;

        private String msg;

        private T body;

        private Builder<T> body(T body){
            this.body = body;
            return this;
        }

        private Builder<T> code(Integer code){
            this.code = code;
            return this;
        }

        private Builder<T> msg(String msg){
            this.msg = msg;
            return this;
        }

        private static <T>  Builder<T> custom(T body){
            return new Builder<T>().body(body);
        }

        private Result<T> build(){
            Result<T> result = new Result<>();
            result.setBody(this.body);
            result.setCode(this.code);
            result.setMsg(this.msg);
            return result;
        }
    }

    public static <T> Result<T> success(T t ,String msg){
        return Builder.custom(t).code(Code.SUCCESS.CODE).msg(msg).build();
    }

    public static <T> Result<T> success(T t){
        return success(t, Code.SUCCESS.MSG);
    }

    public static <T> Result<T> success(){
        return success(null, Code.SUCCESS.MSG);
    }

    public static <T> Result<T> success(String msg){
        return success(null,msg);
    }

    //==================================================================

    public static <T> Result<T> fail(T t ,String msg){
        return Builder.custom(t).code(Code.FAILED.CODE).msg(msg).build();
    }

    public static <T> Result<T> fail(T t){
        return fail(t, Code.FAILED.MSG);
    }

    public static <T> Result<T> fail(){
        return fail(null, Code.FAILED.MSG);
    }

    public static <T> Result<T> fail(String msg){
        return fail(null,msg);
    }

    public enum Code implements Serializable{
        SUCCESS("成功"),
        FAILED("失敗");
        public final String MSG;
        Code(String msg){
            this.MSG = msg;
        }
        public final Integer CODE = this.ordinal();
    }
}

測試代碼

public static void main(String[] args) throws FileNotFoundException {
        ExportExcelUtil excelUtil = ExportExcelUtil.Builder.create(User.class).setIs2003(false).setSax(true).setRowAccessWindowSize(50000).build();
        Result result = new ExportExcelUtil.ExportTemplate().executeExport(new ExportExcelUtil.ExportTemplate.ExportCallBackHandler() {
            @Override
            public Result processExport(ByteArrayOutputStream bos) throws IOException {
                excelUtil.initSheet("用戶列表");
                for(int i = 0; i <100000;i++){
                    User user = new User();
                    user.setId(i+1);
                    user.setAge(18);
                    user.setCreateTime(new Date());
                    user.setEmail("***@123.com");
                    user.setMobile("***");
                    user.setUserName("wl");
                    excelUtil.exportRowSet(user);
                }
                excelUtil.writeWbk(bos);
                //處理bos
                IOUtils.copy(new ByteArrayInputStream(bos.toByteArray()),new FileOutputStream("用戶列表" + excelUtil.getExcelSuffix()));
                return Result.success();
            }
        });
        System.out.println(result.getMsg());

    }

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