Java使用get请求接收List集合数据(json)并导出报表问题

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>easyexcel</artifactId>
      <version>3.0.5</version>
    </dependency>
    
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.28</version>
    </dependency>

@RestController
@RequestMapping("excel/test")
public class excelTest {

    @GetMapping("fileTest")
    public void downloadTemplate(@RequestParam String json, HttpServletResponse response) {
        String fileName = "测试导出模板";
        String sheetName = "测试导出模板";
        
        // 将json字符串转换为List集合对象
        List<GoodsDetailExcelEntity> list = JSONArray.parseArray(json, GoodsDetailExcelEntity.class);

        try {
            // 自定义的Excel工具类
            ExcelUtil.writeExcel(response, list, fileName, sheetName, GoodsDetailExcelEntity.class);
        } catch (Exception e) {
            System.out.println(e.getCause());
        }
    }

}

@Data
public class GoodsDetailExcelEntity {

    @ExcelProperty(value = "物资", index = 0)
    private String goods;

    @ExcelProperty(value = "规格", index = 1)
    private String specs;

    @ExcelProperty(value = "单位", index = 2)
    private String unit;

    @ExcelProperty(value = "单价", index = 3)
    private BigDecimal price;

    @ExcelProperty(value = "数量", index = 4)
    private Integer number;

    @ExcelProperty(value = "金额", index = 5)
    private BigDecimal money;

    @ExcelProperty(value = "施工部位", index = 6)
    private String constructPosition;

    @ExcelProperty(value = "备注", index = 7)
    private String memo;
}

    /**
     * 导出
     * @param response
     * @param data
     * @param fileName
     * @param sheetName
     * @param clazz
     * @throws Exception
     */
    public static void writeExcel(HttpServletResponse response, List<? extends Object> data, String fileName, String sheetName, Class clazz) throws Exception {
        //表头样式
        WriteCellStyle headWriteCellStyle = new WriteCellStyle();
        //设置表头居中对齐
        headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
        //内容样式
        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
        //设置内容靠左对齐
        contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.LEFT);
        HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
        EasyExcel.write(getOutputStream(fileName, response), clazz).excelType(ExcelTypeEnum.XLSX).sheet(sheetName).registerWriteHandler(horizontalCellStyleStrategy).doWrite(data);
    }

    private static OutputStream getOutputStream(String fileName, HttpServletResponse response) throws Exception {
        fileName = URLEncoder.encode(fileName, "UTF-8");
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf8");
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".xlsx");
        response.addHeader("Access-Control-Expose-Headers", "Content-disposition");

        return response.getOutputStream();
    }

}