Spring MVC文件下载

<div>
    <a href="/Cyberspace/main/downloadFile.do?fileName=模板.xlsx">模板下载</a>
</div>

方案一：

    // 文件下载
    @RequestMapping(value = "/downloadFile")
    public ResponseEntity<byte[]> downloadFile() throws IOException {
        String basePath = "F:/testDir/";
        String fileName = "ChromeStandaloneV45.0.2454.101.exe";
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        headers.setContentDispositionFormData("attachment", URLEncoder.encode(fileName, "utf-8"));//这里用URLEncoder.encode是为了解决文件名中的中文乱码问题
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(new File(basePath + fileName)), headers, HttpStatus.CREATED);
    }

配置xxx-servelt.xml

<bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter">
        <constructor-arg value="UTF-8" index="0"></constructor-arg><!-- 避免出现乱码 -->
        <property name="supportedMediaTypes">
            <list>
                <value>text/plain;charset=UTF-8</value>
            </list>
        </property>
    </bean>
    <!-- 避免IE出现下载JSON文件的情况 -->
    <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>text/html;charset=UTF-8</value>
            </list>
        </property>
    </bean>
    <bean id="byteArrayHttpMessageConverter" class="org.springframework.http.converter.ByteArrayHttpMessageConverter" />
    <!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="byteArrayHttpMessageConverter" />
                <ref bean="stringHttpMessageConverter" />
                <ref bean="mappingJacksonHttpMessageConverter" /><!-- json转换器 -->
            </list>
        </property>
    </bean>

方案二：通过Response获得输出流,以流的形式下载文件。以下代码大部分是一样的，自行选择

/**
     * 文件下载
     *
     * @param path
     *            文件路径(绝对)
     * @param response
     *            响应对象
     */
    public static void download(String path, HttpServletResponse response) {
        File file = new File(path);
        InputStream fis = null;
        OutputStream os = null;
        try {
            if (!file.exists()) {
                response.getWriter().print("文件不存在");
            }
            // 以流的形式下载文件
            fis = new BufferedInputStream(new FileInputStream(file));
            // 设置响应报头
            response.reset();
            response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(file.getName(), ENCODING));
            response.addHeader("Content-Length", "" + file.length());
            response.setContentType(MIME_TYPE_BIN);
            response.setCharacterEncoding(ENCODING);

            // 写入响应流数据
            os = new BufferedOutputStream(response.getOutputStream());
            byte[] bytes = new byte[1024];
            while (fis.read(bytes) != -1) {
                os.write(bytes);
            }
        } catch (Throwable e) {
            if (e instanceof ClientAbortException) {
                // 浏览器点击取消
                LOGGER.info("用户取消下载!");
            } else {
                e.printStackTrace();
            }
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
                if (fis != null) {
                    fis.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }

    /**
     * 下载服务器已存在的文件,支持断点续传
     *
     * @param request
     *            请求对象
     * @param response
     *            响应对象
     * @param path
     *            文件路径(绝对)
     */
    public static void download(HttpServletRequest request, HttpServletResponse response, File proposeFile) {
        LOGGER.debug("下载文件路径：" + proposeFile.getPath());
        InputStream inputStream = null;
        OutputStream bufferOut = null;
        try {
            // 设置响应报头
            long fSize = proposeFile.length();
            response.setContentType("application/x-download");
            // Content-Disposition: attachment; filename=WebGoat-OWASP_Developer-5.2.zip
            response.addHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(proposeFile.getName(), ENCODING));
            // Accept-Ranges: bytes
            response.setHeader("Accept-Ranges", "bytes");
            long pos = 0, last = fSize - 1, sum = 0;// pos开始读取位置; last最后读取位置; sum记录总共已经读取了多少字节
            if (null != request.getHeader("Range")) {
                // 断点续传
                response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
                try {
                    // 情景一：RANGE: bytes=2000070- 情景二：RANGE: bytes=2000070-2000970
                    String numRang = request.getHeader("Range").replaceAll("bytes=", "");
                    String[] strRange = numRang.split("-");
                    if (strRange.length == 2) {
                        pos = Long.parseLong(strRange[0].trim());
                        last = Long.parseLong(strRange[1].trim());
                    } else {
                        pos = Long.parseLong(numRang.replaceAll("-", "").trim());
                    }
                } catch (NumberFormatException e) {
                    LOGGER.error(request.getHeader("Range") + " is not Number!");
                    pos = 0;
                }
            }
            long rangLength = last - pos + 1;// 总共需要读取的字节
            // Content-Range: bytes 10-1033/304974592
            String contentRange = new StringBuffer("bytes ").append(pos).append("-").append(last).append("/").append(fSize).toString();
            response.setHeader("Content-Range", contentRange);
            // Content-Length: 1024
            response.addHeader("Content-Length", String.valueOf(rangLength));

            // 跳过已经下载的部分，进行后续下载
            bufferOut = new BufferedOutputStream(response.getOutputStream());
            inputStream = new BufferedInputStream(new FileInputStream(proposeFile));
            inputStream.skip(pos);
            byte[] buffer = new byte[1024];
            int length = 0;
            while (sum < rangLength) {
                length = inputStream.read(buffer, 0, ((rangLength - sum) <= buffer.length ? ((int) (rangLength - sum)) : buffer.length));
                sum = sum + length;
                bufferOut.write(buffer, 0, length);
            }
        } catch (Throwable e) {
            if (e instanceof ClientAbortException) {
                // 浏览器点击取消
                LOGGER.info("用户取消下载!");
            } else {
                LOGGER.info("下载文件失败....");
                e.printStackTrace();
            }
        } finally {
            try {
                if (bufferOut != null) {
                    bufferOut.close();
                }
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static void downloadWithoutEncode(HttpServletRequest request, HttpServletResponse response, File proposeFile) {
        LOGGER.debug("下载文件路径：" + proposeFile.getPath());
        InputStream inputStream = null;
        OutputStream bufferOut = null;
        try {
            // 设置响应报头
            long fSize = proposeFile.length();
            response.setContentType("application/x-download");
            response.addHeader("Content-Disposition", "attachment; filename=" + proposeFile.getName());
            response.setHeader("Accept-Ranges", "bytes");
            long pos = 0, last = fSize - 1, sum = 0;// pos开始读取位置; last最后读取位置; sum记录总共已经读取了多少字节
            if (null != request.getHeader("Range")) {
                // 断点续传
                response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);
                try {
                    // 情景一：RANGE: bytes=2000070- 情景二：RANGE: bytes=2000070-2000970
                    String numRang = request.getHeader("Range").replaceAll("bytes=", "");
                    String[] strRange = numRang.split("-");
                    if (strRange.length == 2) {
                        pos = Long.parseLong(strRange[0].trim());
                        last = Long.parseLong(strRange[1].trim());
                    } else {
                        pos = Long.parseLong(numRang.replaceAll("-", "").trim());
                    }
                } catch (NumberFormatException e) {
                    LOGGER.error(request.getHeader("Range") + " is not Number!");
                    pos = 0;
                }
            }
            long rangLength = last - pos + 1;// 总共需要读取的字节
            // Content-Range: bytes 10-1033/304974592
            String contentRange = new StringBuffer("bytes ").append(pos).append("-").append(last).append("/").append(fSize).toString();
            response.setHeader("Content-Range", contentRange);
            // Content-Length: 1024
            response.addHeader("Content-Length", String.valueOf(rangLength));

            // 跳过已经下载的部分，进行后续下载
            bufferOut = new BufferedOutputStream(response.getOutputStream());
            inputStream = new BufferedInputStream(new FileInputStream(proposeFile));
            inputStream.skip(pos);
            byte[] buffer = new byte[1024];
            int length = 0;
            while (sum < rangLength) {
                length = inputStream.read(buffer, 0, ((rangLength - sum) <= buffer.length ? ((int) (rangLength - sum)) : buffer.length));
                sum = sum + length;
                bufferOut.write(buffer, 0, length);
            }
        } catch (Throwable e) {
            if (e instanceof ClientAbortException) {
                // 浏览器点击取消
                LOGGER.info("用户取消下载!");
            } else {
                LOGGER.info("下载文件失败....");
                e.printStackTrace();
            }
        } finally {
            try {
                if (bufferOut != null) {
                    bufferOut.close();
                }
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * @param path
     *            文件路径(绝对)
     * @param response
     *            响应对象
     * @return
     */
    public static Boolean download(String path, HttpServletResponse response, String filename) {
        Boolean isBoolean = false;
        File file = new File(path);
        InputStream fis = null;
        OutputStream os = null;
        try {
            if (!file.exists()) {
                response.getWriter().print("文件不存在");
            }
            // 以流的形式下载文件
            fis = new BufferedInputStream(new FileInputStream(file));
            // 设置响应报头
            response.reset();
            response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename.trim(), ENCODING));
            response.addHeader("Content-Length", "" + file.length());
            response.setContentType(MIME_TYPE_BIN);
            response.setCharacterEncoding(ENCODING);
            // 写入响应流数据
            os = new BufferedOutputStream(response.getOutputStream());
            byte[] bytes = new byte[1024];
            while (fis.read(bytes) != -1) {
                os.write(bytes);
            }
            isBoolean = true;
        } catch (Throwable e) {
            if (e instanceof ClientAbortException) {
                // 浏览器点击取消
                isBoolean = false;
                LOGGER.info("用户取消下载!");
            } else {
                isBoolean = false;
                e.printStackTrace();
            }
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
                if (fis != null) {
                    fis.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return isBoolean;
    }