java實現(xiàn)導出數(shù)據(jù)為zip壓縮文件

更新時間：2023年11月07日 14:39:09 作者：杞人何憂

這篇文章主要為大家詳細介紹了java如何實現(xiàn)導出數(shù)據(jù)為zip壓縮文件,并且解壓后為json文件,文中的示例代碼講解詳細,感興趣的小伙伴可以跟隨小編一起學習一下

1，前端只要將要導出的數(shù)據(jù)的ids傳回后端就行了

比如

    handleExportApp(row) {
      const ids = row ? [row.id] : this.checkedRows.map(v => v.id); 
      //exportApp為后端導出接口
      exportApp(ids.join(","));
    },

2.后端接口

    public void exportApp(String ids, HttpServletResponse response) {
        if (StringUtils.isBlank(ids)) {
            throw new BusinessException("參數(shù)不能為空");
        }
        List<String> idsList = Arrays.asList(ids.split(","));
        List<App> list = appService.findAppAllListByIds(idsList);
        //創(chuàng)建HttpServerResponse的輸出流
        OutputStream out = null;
        try {
            out = response.getOutputStream();
            BufferedInputStream bis;
            File file = new File("應用數(shù)據(jù)包.zip");
            //通過ZipOutputStream定義要寫入的對象
            ZipOutputStream zos = null;
            zos = new ZipOutputStream(new FileOutputStream(file));
            writeZos(list, zos);
            zos.close();
            //定義返回類型
            response.setContentType("text/html; charset=UTF-8");
            response.setContentType("application/octet-stream");
            response.setHeader("Content-Disposition", "attachment;filename=".concat(String.valueOf(URLEncoder.encode("應用數(shù)據(jù)包.zip", "UTF-8"))));
            bis = new BufferedInputStream(new FileInputStream(file));
            //定義byte，長度就是要轉(zhuǎn)成zip文件的byte長度，避免浪費資源
            byte[] buffer = new byte[bis.available()];
            bis.read(buffer);
            out.flush();
            out.write(buffer);
            file.delete();
        } catch (IOException e) {
            logger.error("應用數(shù)據(jù)包流寫入異常{}", e.getMessage());
            throw new BusinessException("系統(tǒng)異常");
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
     }



    public void writeZos(List<App> list, ZipOutputStream zos) {
        list.forEach(a -> {
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            try {
                byteArrayOutputStream.write(JSONUtil.toJsonStr(a).getBytes());
                zos.putNextEntry(new ZipEntry(a.getName() + ".json"));
                byte[] excelStream = byteArrayOutputStream.toByteArray();
                zos.write(excelStream);
                zos.closeEntry();
            } catch (IOException e) {
                logger.error("應用數(shù)據(jù)包流寫入異常{}", e.getMessage());
                throw new BusinessException("系統(tǒng)異常");
            }
        });
    }

拓展

如果只是導出json文件，不需要壓縮包的話

前端

    handleExportApp(row) {
      this.ids = row ? [row.id] : this.checkedRows.map(v => v.id);
      this.loading = true;
      this.exportData(this.ids);
    },

    exportData(ids) {
      if (ids.length > 0) {
        const currentId = ids.shift(); // 取出數(shù)組中的第一個id
        simulateClick(exportApp(currentId)); // 導出單個數(shù)據(jù)
        setTimeout(() => {
          this.exportData(ids); // 遞歸調(diào)用導出函數(shù)，繼續(xù)下一個數(shù)據(jù)
        }, 10000); // 設置遞歸的間隔時間，以免處理過多數(shù)據(jù)造成性能問題
      }
    },

后端

        if (StringUtils.isBlank(ids)) {
            throw new BusinessException("參數(shù)不能為空");
        }
        List<String> idsList = Arrays.asList(ids.split(","));

        for (String id : idsList) {
            App app = appService.getById(id);

            // 忽略未找到的應用程序
            if (app == null) {
                continue;
            }
            ObjectMapper objectMapper = new ObjectMapper();
            try {
            	//把對象轉(zhuǎn)成json字符串
                String jsonString = objectMapper.writeValueAsString(app);

                // 設置響應頭部信息
                response.setContentType("application/json");
                response.setCharacterEncoding("UTF-8");
                response.setHeader("Content-Disposition", "attachment;filename=".concat(String.valueOf(URLEncoder.encode("應用_" + app.getName() + ".json", "UTF-8"))));

                // 獲取輸出流并寫入JSON字符串
                PrintWriter writer = response.getWriter();
                writer.write(jsonString);
                writer.flush();
                writer.close();
            } catch (IOException e) {
                logger.error("導出應用數(shù)據(jù)異常：{}", e.getMessage());
                throw new BusinessException("系統(tǒng)異常");
            }
        }

但是這樣有一個不好的地方，就是前端用戶體驗感不是很好，需要等待前端一個個文件導出。

到此這篇關(guān)于java實現(xiàn)導出數(shù)據(jù)為zip壓縮文件的文章就介紹到這了,更多相關(guān)java數(shù)據(jù)導出為zip內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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