angular 2 經過http get 下載excel 內容錯誤

服務端代碼：

public ResponseEntity<Resource> exportsequence(@PathVariable String modelname) throws IOException {
        XSSFWorkbook  wb = constructExportData(modelname);
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        wb.write(os);
        InputStreamResource resource = new InputStreamResource(os.toInputStream());
        os.close();
        return ResponseEntity.ok().contentType(MediaType.valueOf("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")).body(resource);
    }
    /**
     *
     *
     * @param modelName
     */
    private XSSFWorkbook constructExportData(String modelName) {
        XSSFWorkbook  wb = new XSSFWorkbook();
        XSSFSheet sheet = wb.createSheet(ExcelFileHandlerUtil.SEQUENCE_SHEET_FC);
        XSSFRow row = sheet.createRow(0);
        XSSFCell cell = row.createCell(0);
        cell.setCellValue(ExcelFileHandlerUtil.MODEL_STRING);



        return wb;
    }

 

客戶端代碼：

return this.http.get(`${this.resourceUrl}/exportsequence/${modelName}`);

用這個下載的時候二進制內容都是正確的，但是打開文件老報錯，打不開。

原來要在請求上加一個   responseType

修改代碼以下：

const requestOptions = {
    responseType: ResponseContentType.Blob
};

return this.http.get(`${this.resourceUrl}/exportsequence/${modelName}`, requestOptions);

記得加：

import {Http, Response,ResponseContentType } from '@angular/http';