前言

業(yè)務(wù)關(guān)系定義

分別是用戶、導(dǎo)出隊列、導(dǎo)出執(zhí)行方法

• ExportQueue： 維護一條定長隊列，可以獲取隊列里前后排隊的用戶，提供查詢，隊列如果已經(jīng)滿了，其余的人需要進行等待
• User信息： 排隊執(zhí)行導(dǎo)出方法對應(yīng)用戶；
• Export類： 定義導(dǎo)出方法，異步執(zhí)行，用戶可以通過導(dǎo)出頁面查看、下載，導(dǎo)出的文件；

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具體代碼實現(xiàn)

ExportQueue隊列

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; // 隊列最大容量    private LinkedList<ExportUser> queue; // 用戶隊列    public ExportQueue(LinkedList<ExportUser> queue) {        this.queue = new LinkedList<>();    }    /**     * 排隊隊列添加     * @param sysUser     */    public synchronized LinkedList<ExportUser> add(ExportUser sysUser) {        while (queue.size() >= MAX_CAPACITY) {            try {                log.info("當(dāng)前排隊人已滿，請等待");                wait();            } catch (InterruptedException e) {                e.getMessage();            }        }        queue.add(sysUser);        log.info("目前導(dǎo)出隊列排隊人數(shù)：" + queue.size());        notifyAll();        return queue;    }    /**     * 獲取排隊隊列下一個人     * @return     */    public synchronized ExportUser getNextSysUser() {        while (queue.isEmpty()) {            try {                wait();            } catch (InterruptedException e) {                e.printStackTrace();            }        }        ExportUser sysUser = queue.remove();        notifyAll(); //喚醒        return sysUser;    }}

AbstractExport導(dǎo)出類

引入EasyExcel百萬級別的導(dǎo)出功能uin28資訊網(wǎng)——每日最新資訊28at.com

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;    /**     * 導(dǎo)出     *     * @param response 輸出流     * @param pageSize 每頁大小     * @param t        導(dǎo)出條件     * @param k        Excel內(nèi)容實體類     * @param fileName 文件名稱     */    public void export(HttpServletResponse response, int pageSize, T t, Class<K> k, String fileName) throws Exception {        ExcelWriter writer = null;        try {            writer = getExcelWriter(response, fileName);            //查詢導(dǎo)出總條數(shù)            int total = this.countExport(t);            //頁數(shù)            int loopCount = PageUtil.totalPage(total, pageSize);            BeanUtil.setProperty(t, "pageSize", pageSize);            for (int i = 0; i < loopCount; i++) {                //開始頁                BeanUtil.setProperty(t, "pageNum", PageUtil.getStart(i + 1, pageSize));                //獲取Excel導(dǎo)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 = "導(dǎo)出" + fileName + "異常";            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");        // 這里URLEncoder.encode可以防止中文亂碼 當(dāng)然和easyexcel沒有關(guān)系        String fileNameUtf = URLEncoder.encode(fileName, "UTF-8").replaceAll("http://+", "%20");        response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileNameUtf + ".xlsx");        return EasyExcel.write(response.getOutputStream()).build();    }    /**     * （模版導(dǎo)出）     *     * @param t     * @param fileName     * @param response     */    public abstract void complexFillWithTable(T t, String fileName, HttpServletResponse response);    /**     * 查詢導(dǎo)出總條數(shù)     *     * @param t     * @return     */    public abstract int countExport(T t);    /**     * 查詢導(dǎo)出數(shù)據(jù)     *     * @param t     * @return     */    public abstract List<K> getExportDetail(T t);}

ExportImpl導(dǎo)出實現(xiàn)方法

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 {        //導(dǎo)出        log.info("導(dǎo)出文件方法執(zhí)行～～～～～～～～～");//        export(response,pageSize,t,k,fileName);        LinkedList<ExportUser> queue = exportQueue.add(sysUser);        log.info("導(dǎo)出隊列：" + queue);        //休眠時間稍微設(shè)置大點，模擬導(dǎo)出處理時間        Thread.sleep(20000);        //導(dǎo)出成功后移除當(dāng)前導(dǎo)出用戶        ExportUser nextSysUser = exportQueue.getNextSysUser();        log.info("移除后獲取下一個排隊的用戶: " + 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;    }}

測試controller

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();        }}

測試結(jié)果

通過請求測試方法，限制了我們導(dǎo)出隊列最大限制10次，隊列場長度超過10次則無法進行繼續(xù)提交；uin28資訊網(wǎng)——每日最新資訊28at.com

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第一次請求和第二次請求，間隔10秒，第一個用戶導(dǎo)出完成后出列，下一個排隊用戶在隊列首位，再進行導(dǎo)出請求排在上一個用戶后面；uin28資訊網(wǎng)——每日最新資訊28at.com

圖片uin28資訊網(wǎng)——每日最新資訊28at.com

總結(jié)

uin28資訊網(wǎng)——每日最新資訊28at.com

本文鏈接：http://m.www897cc.com/showinfo-26-86985-0.html一起聊聊基于隊列實現(xiàn)多人同時導(dǎo)出 Excel

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