**
1.通过url来下载网络资源
**
//下载网络资源
@RequestMapping("downloadNet")
@ResponseBody
public void downloadNet(HttpServletResponse response,String zlmc,String cclj) throws MalformedURLException {
// 下载网络文件
int bytesum = 0;
int byteread = 0;
try {
URL url = new URL(cclj);//http://192.168.1.250:8091/xxx/xx.xx
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
//设置超时间为3秒
conn.setConnectTimeout(3*1000);
//防止屏蔽程序抓取而返回403错误
conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
//得到输入流
InputStream inputStream = conn.getInputStream();
//获取自己数组
byte[] buffer = readInputStream(inputStream);
// 清空response
response.reset();
// 设置response的Header
response.addHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(zlmc, "UTF-8"));
response.setCharacterEncoding("UTF-8");
response.addHeader("Content-Length", "" + buffer.length);
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
toClient.write(buffer);
toClient.flush();
toClient.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 从输入流中获取字节数组
* @param inputStream
* @return
* @throws IOException
*/
public static byte[] readInputStream(InputStream inputStream) throws IOException {
byte[] buffer = new byte[1024];
int len = 0;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
while((len = inputStream.read(buffer)) != -1) {
bos.write(buffer, 0, len);
}
bos.close();
return bos.toByteArray();
}
2.通过指定本地路径下载文件
1）这种方式是通过寻找项目中静态资源中 或者电脑中某个路径下 的文件
/**
* 下载指定下的文件
* @param response
* @param filemc 文件名称
* @param filesuffix 文件后缀
* @throws IOException
*/
@RequestMapping("/xzmb/{filemc}/{filesuffix}")
public void downloadFile(HttpServletRequest request,HttpServletResponse response,@PathVariable("filemc") String filemc,@PathVariable("filesuffix") String filesuffix) throws IOException {
//文件路径
String excelPath = request.getSession().getServletContext().getRealPath("/resources/DownTemplate/"+filemc+"."+filesuffix);
File file = new File(excelPath);
//文件名
String filename = file.getName();
InputStream inputStream = new FileInputStream(file);
//强制下载不打开
response.setContentType("application/force-download");
OutputStream out = response.getOutputStream();
//使用URLEncoder来防止文件名乱码或者读取错误
response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(filename, "UTF-8"));
int b = 0;
byte[] buffer = new byte[1000000];
while (b != -1) {
b = inputStream.read(buffer);
if (b != -1) out.write(buffer, 0, b);
}
System.out.println(buffer);
inputStream.close();
out.close();
out.flush();
}
js调用
window.open("/xzmb/zhlr/xlsx");
2）这种方式是通过查找src下或者resources的文件
/**
* 下载指定下的文件
* @param response
* @param wjmc文件名称
* @throws IOException
*/
@RequestMapping("/xzmb/{filemc}}")
public void downloadFile(HttpServletRequest request,HttpServletResponse response,@PathVariable("wjmc") String wjmc) throws IOException {
try {
Resource resource = (Resource) new ClassPathResource("resources/DownTemplate/"+wjmc);
File file = ((AbstractFileResolvingResource) resource).getFile();
String filename = ((AbstractResource) resource).getFilename();
InputStream inputStream = new FileInputStream(file);
response.setContentType("application/force-download");
OutputStream out = response.getOutputStream();
response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(filename, "UTF-8"));
int b = 0;
byte[] buffer = new byte[1000000];
while (b != -1) {
b = inputStream.read(buffer);
if (b != -1) out.write(buffer, 0, b);
}
System.out.println(buffer);
inputStream.close();
out.close();
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
