文件的上传和下载

一、文件的上传

// io流String realPath = ServletActionContext.getServletContext().getRealPath("\\upload");        // 输入流读取文件        FileInputStream inputStream = new FileInputStream(file);        // 创建一个文件对象        File targetr = new File(realPath, fileFileName);        // 创建一个输出流        FileOutputStream outputStream = new FileOutputStream(targetr);        byte[] bb = new byte[1024];        int len;        while ((len = inputStream.read(bb)) != -1) {            outputStream.write(bb, 0, len);        }        outputStream.close();        inputStream.close();

Struts2中的文件上传

public String upload() throws IOException {        // io流        String realPath = ServletActionContext.getServletContext().getRealPath("\\upload");        // 创建一个文件对象        File targetr = new File(realPath, fileFileName);        FileUtils.copyFile(file, targetr);        return SUCCESS;    }

文件上传过滤器的设置

<!-- 添加文件上传拦截器 -->            <interceptor-ref name="fileUpload">            <!-- 设置允许上传的文件类型 -->                <param name="allowedTypes">                    image/jpeg,image/bmp                </param>                <!-- 设置允许上传的文件大小 -->            <param name="maximumSize">81920</param>            </interceptor-ref>            <interceptor-ref name="defaultStack"/>

二、文件的下载

// 获取到要下载资源        String realPath = ServletActionContext.getServletContext().getRealPath("\\download\\abc.txt");        String filename = realPath.substring(realPath.lastIndexOf("\\") + 1);        // 设置响应头        HttpServletResponse response = ServletActionContext.getResponse();        response.setContentType("text/html;charset=utf-8");        response.setHeader("Content-disposition", "attachment;fileName=" + filename);        // 输入流        FileInputStream inputStream = new FileInputStream(realPath);        // 输出流        ServletOutputStream outputStream = response.getOutputStream();        byte[] bb = new byte[1024];        int len;        while ((len = inputStream.read(bb)) != -1) {            outputStream.write(bb, 0, len);        }        outputStream.close();        inputStream.close();

struts2中的文件下载

public String streamDownLoad() throws IOException{        // 获取到要下载的资源 的路径        String realPath = ServletActionContext.getServletContext().getRealPath("\\download\\abc.txt");        setInputStream(new FileInputStream(realPath));        fileName = realPath.substring(realPath.lastIndexOf("\\")+1);        return Action.SUCCESS;    }