Java——spring mvc 文件下载

准备工作：

1、添加jar包

commons-fileupload-1.2.2.jar、commons-io-2.4.jar

2、配置spring-mvc.xlm配置文件

<!-- 配置文件上传下载filter start -->
<bean id= "multipartResolver" class= "org.springframework.web.multipart.commons.CommonsMultipartResolver ">
<property name= "maxUploadSize" value= "104857600"/>
</bean>
<!-- 配置文件上传下载filter end -->

3、controller代码示例
@RequestMapping(value = "download", method = RequestMethod.GET)
public static void download(HttpServletRequest request,
HttpServletResponse response, String fileName) throws Exception {
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("UTF-8");
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
String newFileName = new String(fileName.getBytes("ISO8859-1"),"UTF-8");
String ctxPath = request.getSession().getServletContext().getRealPath("/") + FileUploadUtils.defaultBaseDir; //文件路径
String downLoadPath = ctxPath +"/"+ newFileName;
long fileLength = new File(downLoadPath).length();
response.setHeader("Content-disposition", "attachment; filename="
+ new String(newFileName.getBytes("gb2312"), "ISO8859-1"));
response.setHeader("Content-Length", String.valueOf(fileLength));
bis = new BufferedInputStream(new FileInputStream(downLoadPath));
bos = new BufferedOutputStream(response.getOutputStream());
byte[] buff = new byte[2048];
int bytesRead;
while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
bis.close(); bos.close();
}