为什么以SXSSFWorkbook来导出excel仍然出现内存溢出的现象？

Question

代码贴出来了，求各位给个解决方案！！

 public String exportExcel(JSONArray exportList, String[] head, String name, String sheetname, boolean b,
            HttpServletRequest req, HttpServletResponse resp) throws IOException {

        // 声明一个工作薄
        String str = "";
        SXSSFWorkbook wb = new SXSSFWorkbook(100);
        Sheet sheet = wb.createSheet();
        wb.setSheetName(0, sheetname);// 工作簿名称
        // 给单子名称一个长度
        sheet.setDefaultColumnWidth((short) 15);
        // 生成一个样式
        CellStyle style = wb.createCellStyle();
        // 创建第一行（也可以称为表头）
        Row row = null;
            row = sheet.createRow(0);
        // 样式字体居中
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        // 创建单元格
        Cell cell= null;

        // 表头
        for (int i = 0; i < head.length; i++) {
            cell = row.createCell(i);
            cell.setCellValue(head[i]);
        }
        JSONObject job = new JSONObject();
        if (exportList.size() > 0) {
            for (int i = 0; i < exportList.size(); i++) {
                row = sheet.createRow(i + 1);
                job = exportList.getJSONObject(i); // 遍历 jsonarray
                                                    // 数组，把每一个对象转成json 对象
                Iterator it = job.keys();
                int j = 0;
                while (it.hasNext()&&j<head.length) { // 遍历对象中的所有键值
                    String key = (String) it.next();
                    String value = job.get(key).toString();
                    if (b) {// 去空
                        if (!"".equals(value)) {
                            row.createCell(j++).setCellValue(value);
                            ;
                        }
                    } else {
                        row.createCell(j++).setCellValue(value);
                        ;
                    }

                }
                if(i%3000==0||i==exportList.size()-1){
                    System.gc();                    
                }
            }
        }
        name = name+".xlsx";
        // 清空response
        resp.reset();
        resp.setContentType("APPLICATION/OCTET-STREAM");
        resp.addHeader("Content-Disposition", "attachment;filename=" + new String(name.getBytes("utf-8"), "iso8859-1"));


        try {
            OutputStream out = resp.getOutputStream();
            wb.write(out);
            out.close();
            str = "{\"status\":\"ok\" , \"message\":\"操作成功!\"}";
        } catch (Exception e) {
            e.printStackTrace();
            str = "{\"status\":\"ok\" , \"message\":\"操作成功!\"}";
        }
        return str;
    }

Answer 1

最后应该加个wb.dispose();