static void test1(){
    
    Model model = new Model();
    {
        Entity entity = new Entity();
        entity.setId(1L);
        model.getEntities().add(entity);
        Data data = new Data();
        data.setX(0);
        data.setY(0);
        entity.setData(data);
    }
    
    new Thread(() -> {
        try {
            Thread.sleep(1000);
        }
        catch (InterruptedException ignored) {
        
        }
        model.getEntities().get(0).getData().setX(1);
        System.out.println("FOO");
    }).start();
    
    while(true){
        if(model.getEntities().get(0).getData().getX()>0) break;
    }
    
    System.out.println("BAR");
}

static final Object lock = new Object();

static void test2(){
    
    Model model = new Model();
    {
        Entity entity = new Entity();
        entity.setId(1L);
        model.getEntities().add(entity);
        Data data = new Data();
        data.setX(0);
        data.setY(0);
        entity.setData(data);
    }
    
    new Thread(() -> {
        try {
            Thread.sleep(1000);
        }
        catch (InterruptedException ignored) {
        
        }
        model.getEntities().get(0).getData().setX(1);
        synchronized (lock){};
        System.out.println("FOO");
        try {
            Thread.sleep(30000);
        }
        catch (InterruptedException ignored) {
        
        }
    }).start();
    
    while(true){
        synchronized (lock){};
        if(model.getEntities().get(0).getData().getX()>0) break;
    }
    
    System.out.println("BAR");
}

EasyExcel.write(response.getOutputStream())
                .needHead(true)
                .head(excelDo.class)
                .excelType(ExcelTypeEnum.XLSX)
                .registerWriteHandler(new ExcelWidthStyleStrategy())
                .sheet("洗消记录")
                .doWrite(excelDoList);

EasyExcel.write(outputStream, ExcelBO.class)
                    .excelType(ExcelTypeEnum.XLSX)
                    .registerWriteHandler(new ExcelWidthStyleStrategy())
                    .sheet("日志")
                    .doWrite(excelBOs);

package com.crim.web.lab.eleeimplement.domain;

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;

import java.time.LocalDateTime;


@Data
public class ExcelBO {
    
    @ExcelProperty("内镜序号")
    private String scopeNo;
    
    @ExcelProperty("内镜名")
    private String scopeName;
    
    @ExcelProperty("员工工号")
    private String staffNo;
    
    @ExcelProperty("员工姓名")
    private String staffName;
    
    @ExcelProperty("时间")
    private String logTime;
    
    @ExcelProperty("设备序号")
    private String deviceNo;
    
    @ExcelProperty("设备名")
    private String deviceName;
    
    @ExcelProperty("设备类型")
    private String deviceTypeName;
    
    @ExcelProperty("备注")
    private String comment;
}

EasyExcel.write(outputStream, ExcelBO.class)
                    .excelType(ExcelTypeEnum.XLSX)
                    //.registerWriteHandler(new ExcelWidthStyleStrategy())
                    .sheet("日志")
                    .doWrite(excelBOs);

@GetMapping("/csv/origin")
public void exportCsvOrigin(HttpServletResponse response) throws IOException {
    LocalDateTime start = LocalDateTime.now();
    //List<ExcelBO> excelBOs = logMapper.excelOrigin();
    List<ExcelBO> excelBOs = logMapper.excelA1();
    LocalDateTime sqlEnd = LocalDateTime.now();
    log.info("结果集行数：{}", excelBOs.size());
    log.info("SQL执行时间：{}", Duration.between(start, sqlEnd));
    
    response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=excel.csv");
    response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
    
    try {
        OutputStream outputStream = response.getOutputStream();
        
        // 使用EasyExcel实现性能极差，需要4-5秒
        // EasyExcel.write(outputStream, ExcelBO.class)
        //         .excelType(ExcelTypeEnum.CSV)
        //         .sheet("日志")
        //         .doWrite(excelBOs);
        
        // 手动实现
        // 写入头，包括UTF-8 BOM
        outputStream.write(new byte[]{(byte) 0xEF, (byte) 0xBB, (byte) 0xBF});
        outputStream.write("内镜序号,内镜名,员工工号,员工姓名,时间,设备序号,设备名,设备类型,备注\n".getBytes(StandardCharsets.UTF_8));
        // 写入数据，每1000行刷新一次
        int count = 0;
        for (ExcelBO excelBO : excelBOs) {
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append(excelBO.getScopeNo()).append(",")
                    .append(excelBO.getScopeName()).append(",")
                    .append(excelBO.getStaffNo()).append(",")
                    .append(excelBO.getStaffName()).append(",")
                    .append(excelBO.getLogTime()).append(",")
                    .append(excelBO.getDeviceNo()).append(",")
                    .append(excelBO.getDeviceName()).append(",")
                    .append(excelBO.getDeviceTypeName()).append(",")
                    .append(excelBO.getComment()).append("\n");
            outputStream.write(stringBuilder.toString().getBytes(StandardCharsets.UTF_8));
            count++;
            if (count % 1000 == 0) {
                outputStream.flush();
            }
        }
        
        outputStream.flush();
        
        LocalDateTime excelEnd = LocalDateTime.now();
        log.info("excel耗时：{}", Duration.between(sqlEnd, excelEnd));
        
    }
    catch (Exception e) {
        log.error(e.getMessage(), e);
        response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    
    LocalDateTime end = LocalDateTime.now();
    log.info("总耗时：{}", Duration.between(start, end));
}

@GetMapping("/csv/cursor")
@Transactional
public void exportCsvCursor(HttpServletResponse response) throws IOException {
    
    LocalDateTime start = LocalDateTime.now();
    
    try (Cursor<ExcelBO> excelBOCursor = logMapper.excelC1()) {
        
        LocalDateTime sqlEnd = LocalDateTime.now();
        log.info("SQL执行时间：{}", Duration.between(start, sqlEnd));
        
        response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=excel.csv");
        response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
        
        
        OutputStream outputStream = response.getOutputStream();
        
        // 手动实现
        // 写入头，包括UTF-8 BOM
        outputStream.write(new byte[]{(byte) 0xEF, (byte) 0xBB, (byte) 0xBF});
        outputStream.write("内镜序号,内镜名,员工工号,员工姓名,时间,设备序号,设备名,设备类型,备注\n".getBytes(StandardCharsets.UTF_8));
        // 写入数据，每1000行刷新一次
        int count = 0;
        for (ExcelBO excelBO : excelBOCursor) {
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append(excelBO.getScopeNo()).append(",")
                    .append(excelBO.getScopeName()).append(",")
                    .append(excelBO.getStaffNo()).append(",")
                    .append(excelBO.getStaffName()).append(",")
                    .append(excelBO.getLogTime()).append(",")
                    .append(excelBO.getDeviceNo()).append(",")
                    .append(excelBO.getDeviceName()).append(",")
                    .append(excelBO.getDeviceTypeName()).append(",")
                    .append(excelBO.getComment()).append("\n");
            outputStream.write(stringBuilder.toString().getBytes(StandardCharsets.UTF_8));
            count++;
            if (count % 1000 == 0) {
                outputStream.flush();
            }
        }
        
        outputStream.flush();
        
        LocalDateTime excelEnd = LocalDateTime.now();
        log.info("excel耗时：{}", Duration.between(sqlEnd, excelEnd));
        
        LocalDateTime end = LocalDateTime.now();
        log.info("总耗时：{}", Duration.between(start, end));
        
    }
    catch (Exception e) {
        log.error(e.getMessage(), e);
        response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    
}

@Options(fetchSize = Integer.MIN_VALUE)
Cursor<ExcelBO> excelC1();

@GetMapping("/page/test/simple")
@Transactional
public String pageTest() throws IOException {
    
    String returnValue = "Hello World!";
    
    long startId = 1;
    long batchSize = 1000;
    long endId = startId + batchSize - 1;
    
    long count = 0;
    long batchIndex = 1;
    
    Duration minDuration = Duration.ofMillis(Long.MAX_VALUE);
    Duration maxDuration = Duration.ZERO;
    
    LocalDateTime start = LocalDateTime.now();
    LocalDateTime current = LocalDateTime.now();
    
    while (true) {
        
        List<ExcelBO> excelBOList = logMapper.excelC1_1(startId, endId);
        
        Duration duration = Duration.between(current, LocalDateTime.now());
        if (duration.compareTo(minDuration) < 0) minDuration = duration;
        if (duration.compareTo(maxDuration) > 0) maxDuration = duration;
        log.info("第{}批次耗时：{}", batchIndex, duration);
        current = LocalDateTime.now();
        batchIndex++;
        
        if (excelBOList == null || excelBOList.isEmpty()) break;
        startId += batchSize;
        endId += batchSize;
        
        for (ExcelBO excelBO : excelBOList) {
            if (excelBO != null)
                count++;
        }
    }
    
    log.info("总耗时：{}", Duration.between(start, LocalDateTime.now()));
    log.info("最小耗时：{}", minDuration);
    log.info("最大耗时：{}", maxDuration);
    
    returnValue += "\n行数：" + count;
    return returnValue;
}

List<ExcelBO> excelC1_1(@Param("startId") Long startId, @Param("endId") Long endId);

/**
 * 键集分页并发查询测试
 */
@GetMapping("/page/test/thread")
public String pageTestThread() throws IOException {
    
    String returnValue = "Hello World!";
    
    final long threadsCount = 4;
    final long batchSize = 1000;
    
    final LocalDateTime start = LocalDateTime.now();
    
    
    // 定义线程任务，0线程任务处理第1批次，1线程任务处理第2批次，以此类推
    class PageTask implements Runnable {
        
        // 从0开始
        private final int threadIndex;
        // 1是最小值
        private long startId;
        private long count = 0;
        private long batchCount = 0;
        
        private final List<LocalDateTime> times = new ArrayList<>();
        
        public PageTask(int threadIndex) {
            this.threadIndex = threadIndex;
            this.startId = threadIndex * batchSize + 1;
        }
        
        @Override
        public void run() {
            try {
                
                this.times.add(LocalDateTime.now());
                while (true) {
                    List<ExcelBO> excelBOList = logMapper.excelC1_1(startId, startId + batchSize - 1);
                    
                    this.batchCount++;
                    this.times.add(LocalDateTime.now());
                    log.info("线程任务{}已处理{}批次数据", this.threadIndex, this.batchCount);
                    
                    if (excelBOList == null || excelBOList.isEmpty()) break;
                    startId += batchSize * threadsCount;
                    for (ExcelBO excelBO : excelBOList) {
                        if (excelBO != null)
                            count++;
                    }
                }
                
                LocalDateTime threadEnd = LocalDateTime.now();
                
                // 耗时统计
                List<Duration> durations = new ArrayList<>();
                for (int i = 0; i < this.times.size() - 1; i++) {
                    durations.add(Duration.between(this.times.get(i), this.times.get(i + 1)));
                }
                log.info("线程任务{}耗时：{}", this.threadIndex, durations);
                log.info("线程任务{}行数：{}", this.threadIndex, this.count);
                log.info("线程任务{}遍历耗时：{}", this.threadIndex,
                        Duration.between(this.times.get(0), this.times.get(this.times.size() - 1)));
                log.info("线程任务{}总耗时：{}", this.threadIndex, Duration.between(start, threadEnd));
                // 统计五个最大耗时
                List<Duration> maxDurations = durations.stream().sorted(Comparator.reverseOrder())
                        .limit(5).collect(Collectors.toList());
                log.info("线程任务{}最大耗时：{}", this.threadIndex, maxDurations);
                // 统计五个最小耗时
                List<Duration> minDurations = durations.stream().sorted().limit(5).collect(Collectors.toList());
                log.info("线程任务{}最小耗时：{}", this.threadIndex, minDurations);
                
                
            }
            catch (Exception e) {
                log.error("线程任务{}异常：{}", this.threadIndex, e.getMessage());
            }
        }
    }
    
    List<Thread> threads = new ArrayList<>();
    for (int i = 0; i < threadsCount; i++) {
        Thread thread = new Thread(new PageTask(i));
        threads.add(thread);
    }
    threads.forEach(Thread::start);
    threads.forEach(thread -> {
        try {
            thread.join();
        }
        catch (InterruptedException e) {
            log.error("线程任务{}异常：{}", thread.getName(), e.getMessage());
        }
    });
    
    LocalDateTime end = LocalDateTime.now();
    log.info("所有线程总耗时：{}", Duration.between(start, end));
    
    return returnValue;
}

@GetMapping("/excel/fast")
public void exportExcelFast(HttpServletResponse response) throws IOException {
    
    LocalDateTime start = LocalDateTime.now();
    List<ExcelBO> excelBOs = logMapper.excelA1();
    LocalDateTime sqlEnd = LocalDateTime.now();
    log.info("结果集行数：{}", excelBOs.size());
    log.info("SQL执行时间：{}", Duration.between(start, sqlEnd));
    
    response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=excel.xlsx");
    response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
    
    OutputStream outputStream = response.getOutputStream();
    
    // org.dhatim.fastexcel.Workbook
    try (Workbook workbook = new Workbook(outputStream, "ELEE", "1.0")) {
        
        Worksheet worksheet = workbook.newWorksheet("日志");
        // 写入头
        worksheet.value(0, 0, "内镜序号");
        worksheet.value(0, 1, "内镜名");
        worksheet.value(0, 2, "员工工号");
        worksheet.value(0, 3, "员工姓名");
        worksheet.value(0, 4, "时间");
        worksheet.value(0, 5, "设备序号");
        worksheet.value(0, 6, "设备名");
        worksheet.value(0, 7, "设备类型");
        worksheet.value(0, 8, "备注");
        // 写入数据
        for (int i = 0; i < excelBOs.size(); i++) {
            worksheet.value(i + 1, 0, excelBOs.get(i).getScopeNo());
            worksheet.value(i + 1, 1, excelBOs.get(i).getScopeName());
            worksheet.value(i + 1, 2, excelBOs.get(i).getStaffNo());
            worksheet.value(i + 1, 3, excelBOs.get(i).getStaffName());
            worksheet.value(i + 1, 4, excelBOs.get(i).getLogTime());
            worksheet.style(i + 1, 4).format("yyyy-MM-dd HH:mm:ss").set();
            worksheet.value(i + 1, 5, excelBOs.get(i).getDeviceNo());
            worksheet.value(i + 1, 6, excelBOs.get(i).getDeviceName());
            worksheet.value(i + 1, 7, excelBOs.get(i).getDeviceTypeName());
            worksheet.value(i + 1, 8, excelBOs.get(i).getComment());
            // 每隔1000行写入一次
            if (i % 1000 == 0) {
                worksheet.flush();
                outputStream.flush();
            }
        }
        worksheet.finish();
        workbook.close();
        outputStream.flush();
        
        LocalDateTime excelEnd = LocalDateTime.now();
        log.info("excel耗时：{}", Duration.between(sqlEnd, excelEnd));
        
    }
    catch (Exception e) {
        log.error(e.getMessage(), e);
        response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
    
    LocalDateTime end = LocalDateTime.now();
    log.info("总耗时：{}", Duration.between(start, end));
    
}

@GetMapping("/page/fast/simple")
@Transactional
public void pageFastSimple(HttpServletResponse response) throws IOException {
    
    long startId = 1;
    long batchSize = 10000;
    int row = 0;
    
    LocalDateTime start = LocalDateTime.now();
    
    
    response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=excel.xlsx");
    response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
    
    OutputStream outputStream = response.getOutputStream();
    try (Workbook workbook = new Workbook(outputStream, "ELEE", "1.0")) {
        
        Worksheet worksheet = workbook.newWorksheet("日志");
        // 写入头
        worksheet.value(0, 0, "内镜序号");
        worksheet.value(0, 1, "内镜名");
        worksheet.value(0, 2, "员工工号");
        worksheet.value(0, 3, "员工姓名");
        worksheet.value(0, 4, "时间");
        worksheet.value(0, 5, "设备序号");
        worksheet.value(0, 6, "设备名");
        worksheet.value(0, 7, "设备类型");
        worksheet.value(0, 8, "备注");
        
        row++;
        
        // 写入数据
        while (true) {
            List<ExcelBO> excelBOList = logMapper.excelC1_1(startId, startId + batchSize - 1);
            
            if (excelBOList == null || excelBOList.isEmpty()) break;
            startId += batchSize;
            
            for (ExcelBO excelBO : excelBOList) {
                worksheet.value(row, 0, excelBO.getScopeNo());
                worksheet.value(row, 1, excelBO.getScopeName());
                worksheet.value(row, 2, excelBO.getStaffNo());
                worksheet.value(row, 3, excelBO.getStaffName());
                worksheet.value(row, 4, excelBO.getLogTime());
                worksheet.style(row, 4).format("yyyy-MM-dd HH:mm:ss").set();
                worksheet.value(row, 5, excelBO.getDeviceNo());
                worksheet.value(row, 6, excelBO.getDeviceName());
                worksheet.value(row, 7, excelBO.getDeviceTypeName());
                worksheet.value(row, 8, excelBO.getComment());
                
                row++;
            }
            
            worksheet.flush();
            outputStream.flush();
            
            // 显式清除数据
            excelBOList.clear();
        }
        
        // 后处理
        worksheet.finish();
        workbook.close();
        outputStream.flush();
        
        log.info("总耗时：{}", Duration.between(start, LocalDateTime.now()));
        log.info("行数：{}", row);
    }
    catch (Exception e) {
        log.error(e.getMessage(), e);
        response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
}