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package com.example.system.config;import com.example.system.api.domain.ExportUser;import lombok.extern.slf4j.Slf4j;import org.springframework.stereotype.Component;import java.util.LinkedList;@Slf4j@Componentpublic class ExportQueue { private final int MAX_CAPACITY = 10; // 队列最大容量 private LinkedList<ExportUser> queue; // 用户队列 public ExportQueue(LinkedList<ExportUser> queue) { this.queue = new LinkedList<>(); } /** * 排队队列添加 * @param sysUser */ public synchronized LinkedList<ExportUser> add(ExportUser sysUser) { while (queue.size() >= MAX_CAPACITY) { try { log.info("当前排队人已满,请等待"); wait(); } catch (InterruptedException e) { e.getMessage(); } } queue.add(sysUser); log.info("目前导出队列排队人数:" + queue.size()); notifyAll(); return queue; } /** * 获取排队队列下一个人 * @return */ public synchronized ExportUser getNextSysUser() { while (queue.isEmpty()) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } ExportUser sysUser = queue.remove(); notifyAll(); //唤醒 return sysUser; }}
引入EasyExcel百万级别的导出功能
package com.example.system.config;import cn.hutool.core.bean.BeanUtil;import cn.hutool.core.util.PageUtil;import com.alibaba.excel.EasyExcel;import com.alibaba.excel.ExcelWriter;import com.alibaba.excel.write.metadata.WriteSheet;import com.example.system.api.domain.ExportUser;import lombok.extern.slf4j.Slf4j;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.net.URLEncoder;import java.util.List;@Slf4jpublic abstract class AbstractExport<T, K> { public abstract void export(ExportUser sysUser) throws InterruptedException; /** * 导出 * * @param response 输出流 * @param pageSize 每页大小 * @param t 导出条件 * @param k Excel内容实体类 * @param fileName 文件名称 */ public void export(HttpServletResponse response, int pageSize, T t, Class<K> k, String fileName) throws Exception { ExcelWriter writer = null; try { writer = getExcelWriter(response, fileName); //查询导出总条数 int total = this.countExport(t); //页数 int loopCount = PageUtil.totalPage(total, pageSize); BeanUtil.setProperty(t, "pageSize", pageSize); for (int i = 0; i < loopCount; i++) { //开始页 BeanUtil.setProperty(t, "pageNum", PageUtil.getStart(i + 1, pageSize)); //获取Excel导出信息 List<K> kList = this.getExportDetail(t); WriteSheet writeSheet = EasyExcel.writerSheet(fileName).head(k).build(); writer.write(kList, writeSheet); } } catch (Exception e) { String msg = "导出" + fileName + "异常"; log.error(msg, e); throw new Exception(msg + e); } finally { if (writer != null) { writer.finish(); } } } public com.alibaba.excel.ExcelWriter getExcelWriter(HttpServletResponse response, String fileName) throws IOException { response.setContentType("application/vnd.ms-excel"); response.setCharacterEncoding("utf-8"); // 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系 String fileNameUtf = URLEncoder.encode(fileName, "UTF-8").replaceAll("//+", "%20"); response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileNameUtf + ".xlsx"); return EasyExcel.write(response.getOutputStream()).build(); } /** * (模版导出) * * @param t * @param fileName * @param response */ public abstract void complexFillWithTable(T t, String fileName, HttpServletResponse response); /** * 查询导出总条数 * * @param t * @return */ public abstract int countExport(T t); /** * 查询导出数据 * * @param t * @return */ public abstract List<K> getExportDetail(T t);}
package com.example.system.service.impl;import com.alibaba.excel.ExcelWriter;import com.example.system.api.domain.ExportUser;import com.example.system.config.AbstractExport;import com.example.system.config.ExportQueue;import lombok.extern.slf4j.Slf4j;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.util.LinkedList;import java.util.List;@Service@Slf4jpublic class ExportImpl extends AbstractExport { @Autowired private ExportQueue exportQueue; @Override public void export(ExportUser sysUser) throws InterruptedException { //导出 log.info("导出文件方法执行~~~~~~~~~");// export(response,pageSize,t,k,fileName); LinkedList<ExportUser> queue = exportQueue.add(sysUser); log.info("导出队列:" + queue); //休眠时间稍微设置大点,模拟导出处理时间 Thread.sleep(20000); //导出成功后移除当前导出用户 ExportUser nextSysUser = exportQueue.getNextSysUser(); log.info("移除后获取下一个排队的用户: " + nextSysUser.getUserName()); } @Override public void export(HttpServletResponse response, int pageSize, Object o, Class k, String fileName) throws Exception { super.export(response, pageSize, o, k, fileName); } @Override public ExcelWriter getExcelWriter(HttpServletResponse response, String fileName) throws IOException { return super.getExcelWriter(response, fileName); } @Override public void complexFillWithTable(Object o, String fileName, HttpServletResponse response) { } @Override public int countExport(Object o) { return 0; } @Override public List getExportDetail(Object o) { return null; }}
package com.example.system.controller;import com.example.system.api.domain.ExportUser;import com.example.system.api.domain.SysUser;import com.example.system.service.impl.ExportImpl;import lombok.SneakyThrows;import lombok.extern.slf4j.Slf4j;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestController@RequestMapping("/export")@Slf4jpublic class ExportController { @Autowired private ExportImpl export; @PostMapping("/exportFile") public void exportFile() { new Thread(new Runnable() { @SneakyThrows @Override public void run() { Thread thread1 = Thread.currentThread(); ExportUser sysUser =new ExportUser(); sysUser.setUserName(thread1.getName()); export.export(sysUser); } }).start(); }}
通过请求测试方法,限制了我们导出队列最大限制10次,队列场长度超过10次则无法进行继续提交;
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第一次请求和第二次请求,间隔10秒,第一个用户导出完成后出列,下一个排队用户在队列首位,再进行导出请求排在上一个用户后面;
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