java通过url下载文件并输出的方法

java通过url下载文件并输出的方法

实例如下所示：

controller：

@RequestMapping(value = "/{loanid}/{atmtType}")

public void doGet(@PathVariable("loanid") String loanid,@PathVariable("atmtType") String atmtType,

HttpServletRequest req,HttpServletResponse response) {

Map map = new HashMap();

map.put("loanid", loanid);

Map urlByLoanid= new HashMap();

// Map urlByLoanid = zcmQueryInfoService.queryUrlByLoanid(map);

try {

if(urlByLoanid!=null){

String wjurl="http://10.0.15.11:8080/gateway//nfs/marvel-core-admin/2017/10/11/compact_seal_17101119371231615_7.pdf";

//String wjurl = urlByLoanid.get("url");

int i = wjurl.lastIndexOf("/");

String fileName = wjurl.substring(i+1);

URL url = new URL(wjurl);

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 inputStrhttp://eam = conn.getInputStream();

//获取自己数组

byte[] bs = readInputStream(inputStream);

response.setContentType("application/octet-stream;charset=ISO8859-1");

BufferedOutputStream output = null;

BufferedInputStream input = null;

try {

output = new BufferedOutputStream(response.getOutputStream());

// 中文文件名必须转码为 ISO8859-1,否则为乱码

String fileNameDown = new String(fileName.getBytes(), "ISO8859-1");

// 作为附件下载

response.setHeader("Content-Disposition", "attachment;filename=" + fileNameDown);

output.write(bs);

response.flushBuffer();

} catch (Exception e) {

log.error("Download log file error", e);

} // 用户可能取消了下载

finally {

if (input != null)

try {

input.close();

} catch (IOException e) {

e.printStackTrace();

}

if (output != null)

try {

output.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

} catch (Exception 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();

}

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