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本篇文章給大家分享的是有關(guān)怎么在Spring Mvc中以文件流方式下載文件,小編覺(jué)得挺實(shí)用的,因此分享給大家學(xué)習(xí),希望大家閱讀完這篇文章后可以有所收獲,話不多說(shuō),跟著小編一起來(lái)看看吧。
function downloadFile(filePath,fileName){ fileName = fileName.substr(0,fileName.lastIndexOf(".")); $.ajax({ async : false, cache:false, type: 'get', dataType : "json", url: RootPath() + "/checkDownload",//請(qǐng)求的action路徑 data:{url:filePath}, error: function () {//請(qǐng)求失敗處理函數(shù) alert("下載失敗"); }, success:function(json) { //請(qǐng)求成功后處理函數(shù)。 var code = json.code; if(code) { window.location.href = RootPath()+"/todownload?url="+filePath+"&name="+fileName; }else { layer.alert(fileName+' 文件不存在'); } } }); }
該ajax調(diào)用后臺(tái)(checkDownload)方法,首先判斷從該url能否獲得指定下載的文件,如果獲取不到,方法返回參數(shù)code=0,頁(yè)面彈出“...文件不存在”。
@RequestMapping("/checkDownload") @ResponseBody public Result checkDownload(String url,HttpServletResponse response) { Result result = Result.createSuccessResult(); HttpURLConnection conn = null; try { URL path = new URL(url); conn = (HttpURLConnection) path.openConnection(); conn.setRequestMethod("GET"); conn.setConnectTimeout(5 * 1000); conn.getInputStream();// 通過(guò)輸入流獲取數(shù)據(jù) } catch (IOException ex) { result.setCode(0); ex.printStackTrace(); }finally { if(conn != null) { conn.disconnect(); } } return result; }
如果checkDownload方法中能夠正確獲得資源,方法返回參數(shù)code=1,ajax成功執(zhí)行:window.location.href = RootPath()+"/todownload?url="+filePath+"&name="+fileName; 調(diào)用(todownload)方法,傳入url和name,執(zhí)行文件下載。
@RequestMapping("/todownload") @ResponseBody public void download(String url, String name, HttpServletResponse response) { HttpURLConnection conn = null; try { File file = new File(url); // 取得文件的后綴名。 String ext = file.getName().substring(file.getName().lastIndexOf(".") + 1).toLowerCase(); StringBuffer buffername = new StringBuffer(name); String filename = buffername.append(".").append(ext).toString(); URL path = new URL(url); conn = (HttpURLConnection) path.openConnection(); conn.setRequestMethod("GET"); conn.setConnectTimeout(5 * 1000); InputStream fis = conn.getInputStream();// 通過(guò)輸入流獲取數(shù)據(jù) byte[] buffer = readInputStream(fis); if (null != buffer && buffer.length > 0) { // 清空response response.reset(); // 設(shè)置response的Header response.addHeader("Content-Disposition","attachment;filename="+ new String((filename).getBytes("GBK"),"ISO8859_1")); response.addHeader("Content-Length", "" + buffer.length); OutputStream toClient = response.getOutputStream(); response.setContentType("application/octet-stream"); toClient.write(buffer); toClient.flush(); toClient.close(); } } catch (IOException ex) { ex.printStackTrace(); }finally { if(conn != null) { conn.disconnect(); } } } /** * 從輸入流中獲取數(shù)據(jù) * @param inStream 輸入流 * @return * @throws Exception */ private byte[] readInputStream(InputStream fis) throws IOException { ByteArrayOutputStream outStream = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = 0; while( (len=fis.read(buffer)) != -1 ){ outStream.write(buffer, 0, len); } fis.close(); return outStream.toByteArray(); }
PS:Spring MVC 文件流形式下載(返回)視頻文件
import io.swagger.annotations.Api; import io.swagger.annotations.ApiOperation; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream; import java.net.URLEncoder; /** * 文件流形式下載視頻 * @author Front Ng * @date 2019-05-23 09:25 **/ @Controller @RequestMapping(value = "/download") @Api(value = "下載", tags = "下載") public class DownloadController { @ApiOperation(value = "下載視頻") @RequestMapping(method = RequestMethod.GET) public void download(HttpServletResponse response) throws IOException { File file = new File("/Users/front/Downloads/123.mp4"); FileInputStream inputStream = new FileInputStream(file); byte[] data = new byte[(int) file.length()]; int length = inputStream.read(data); inputStream.close(); String fileName = URLEncoder.encode("文件流形式視頻.mp4", "UTF-8"); response.setContentType("application/octet-stream;charset=UTF-8"); response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\""); response.addHeader("Content-Length", "" + data.length); OutputStream stream = response.getOutputStream(); stream.write(data); stream.flush(); stream.close(); } }
以上就是怎么在Spring Mvc中以文件流方式下載文件,小編相信有部分知識(shí)點(diǎn)可能是我們?nèi)粘9ぷ鲿?huì)見(jiàn)到或用到的。希望你能通過(guò)這篇文章學(xué)到更多知識(shí)。更多詳情敬請(qǐng)關(guān)注億速云行業(yè)資訊頻道。
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