前端ajax调用后端下载Excel模板流，解决输出乱码等问题

JavaScript方法

function importTemplate() {
    $.ajax({
        url: "/importTemplate",
        type: "get",
        success: function (data) {
            let downloadUrl = "../importTemplate"
            // 创建a标签
            let label = $("<a>");
            // 添加属性
            label.prop("href",downloadUrl);
            // 追加标签
            $("body").append(label);
            // 点击a标签
            label[0].click();
            // 点击后移除标签
            label.remove();
        }
    })
}

//Excel导出
form.on('submit(exportExcel)', function (){
    var dataJson = {};
    if (book_tb_this != null) {
        console.log("缓存数据格式：",book_tb_this.where);
        dataJson = book_tb_this.where;
    }
    $.ajax({
        url: "status/export",
        data: dataJson,
        type: "get",
        xhrFields: {
            responseType: 'blob' // 设置响应类型为二进制流
        },
        success: function (response, status, xhr) {
            // 从响应头获取文件名
             var blob = new Blob([response], { type: xhr.getResponseHeader('Content-Type') });
             var link = document.createElement('a');
             link.href = window.URL.createObjectURL(blob);
             link.download = "占用状态报表.xlsx";
             // 设置下载文件的名称
             link.click();
        }
    })
});

后端输出流

OutputStream os = null;
try {
    response.reset();
    response.setCharacterEncoding("UTF-8");
    response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode(fileName, "UTF-8"));
    response.setHeader("Content-Type", "application/octet-stream");
    response.setHeader("Connection", "close");
    os = response.getOutputStream();
    wb.write(os);
    os.flush();
} catch (Exception e) {
    e.printStackTrace();
} finally {
    try {
        if (os != null) {
            os.close();
        }
        if (wb != null) {
            wb.close();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}