Spring MVC文件下载
2024-09-23 10:04:11
<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;
}
最新文章
- java更改数据库中的数据
- jqgrid在colModel中多次调用同一个字段值
- AngularJS快速入门指南01：导言
- 【转】Android使用Log4j例子
- 文件频繁IO能有多大的差别
- Jackson - Quickstart
- tcpdump来抓取执行的sql语句
- Eclipse 导入项目乱码问题（中文乱码）
- ViewDragHelper练习使用
- Mac下一个svn提交.a文件
- vue-cli 使用小技巧
- 18.CSS
- HDU 6181：Two Paths（次短路）
- POJ 3368
- weinre 远程调试 安装 配置
- android开发-c++代码调用so库
- Centos 7 配置单机Hadoop
- 使用Ajax、json实现京东购物车结算界面的数据交互
- TypeScript : 语法及特性
- Sandglass