java Excel文件的下载 前后台代码

前台

JSP：

<button class="btn btn-danger" id="download_btn" th:text="#{DOWNLOAD_OQC_EXC_BTN_TAG}"></button>

JS:

//定义按钮
var domObj = {
        button: {
            $download_btn: $("#download_btn"),
        },
    };

//按钮逻辑
var btnFunc = {
    download_func: function () {
            var filePath = "E:/workspace_oem/oem-jn/src/main/resources/static/excelModel"
            var fileName = "出货模板.xlsx";

            if ($("#downForm").length > 0) {
                $("#downForm").remove();
            }
            var str = '<form id="downForm" action="download.do" method="post">';
            str = str + '<input type="hidden" name="filePath" id= "filePath" />';
            str = str + '<input type="hidden" name="fileName" id= "fileName" />';
            str = str + "</form>";

            $(str).appendTo("body");
            $("#filePath").val(filePath);
            $("#fileName").val(fileName);
            $("#downForm").submit();
        }
    }；

   var iniButtonAction = function () {
        domObj.button.$download_btn.click(function () {
            btnFunc.download_func();
        });
    };


    //页面初始化后执行的方法
    var initializationFunc = function () {
        iniButtonAction();
    };


    //页面加载后执行
    initializationFunc();

后台：

@Controller//使用Controller管理
public class ExcelController {

    private Logger logger = LoggerFactory.getLogger(this.getClass());
    @Autowired
    private IRetBoxInfoRepository retBox;

    @RequestMapping(value = "/download.do")
    public void downloadModel(HttpServletRequest request, HttpServletResponse response, HttpSession session,String filePath,String fileName) throws IOException {
        if (StringUtils.isEmpty(fileName)) {
            fileName = "NameUndefined";
        }
//        String temp1 = File.separator;//路径分隔符("\\")
        String url = filePath + "/" + fileName;
        System.out.println("filedownload =" + url);
        export(request, response, url, fileName);
    }

    

    public void export(HttpServletRequest request, HttpServletResponse response,String url,String fileName) throws IOException {
        response.setContentType("application/octet-stream");
        if (request.getHeader("user-agent").toLowerCase().indexOf("firefox") > -1) {
            //火狐浏览器自己会对URL进行一次URL转码所以区别处理
            response.setHeader("Content-Disposition", "attachment;filename="
                    + new String(fileName.getBytes("utf-8"), "ISO-8859-1"));
        } else {
            response.setHeader("Content-Disposition", "attachment;filename="
                    + URLEncoder.encode(fileName,"utf-8"));        }
        //新建文件输入输出流
        OutputStream output = null;
        FileInputStream fis = null;
        try{

            File f = new File(url);//新建File对象
            output = response.getOutputStream();//新建文件输入输出流对象
            fis = new FileInputStream(f);
            byte[] b = new byte[(int)f.length()]; //设置每次写入缓存大小

            //把输出流写入客户端
            int i = 0;
            while((i = fis.read(b)) > 0){
                output.write(b, 0, i);
            }
            output.flush();
        }
        catch(Exception e){
            e.printStackTrace();
        }
        finally
        {
            if(fis != null)
            {
                fis.close();
                fis = null;
            }
            if(output != null)
            {
                output.close();
                output = null;
            }
        }
    }
}