上傳圖片到專案路徑下儲存
阿新 • • 發佈：2021-12-06
Java獲取檔案地址分隔符：File.separator
java獲取專案路徑：
new File("").getCanonicalPath();===================================================================
上傳圖片程式碼：
package com.lexue.lexueManager.controller; import com.lexue.lexueManager.annotation.LoginRequired; import com.lexue.lexueManager.util.LexueConstant; import com.lexue.lexueManager.utils.R; import org.apache.commons.lang3.StringUtils; import org.springframework.beans.factory.annotation.Value; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.multipart.MultipartFile; import java.io.File; import java.io.IOException; import java.util.UUID; /** * @author wyw * @email [email protected] * @date 2021-10-26 16:20:55 */ @RestController @RequestMapping("lexueManager/photo") public class PhotoController { @Value("${Photo.domain}") private String domain; /** * 上傳圖片。 */ @LoginRequired @RequestMapping("/upload") public R uploadPhoto(MultipartFile file) { if (file == null) { return R.error("請選擇圖片上傳").put("code", LexueConstant.PHOTO_EMPTY); } String fileName = file.getOriginalFilename();//獲取初始檔名 int indexOf = fileName.lastIndexOf("."); if(indexOf == -1){ return R.error("圖片格式不正確").put("code", LexueConstant.PHOTO_ERROR); } String suffix = fileName.substring(indexOf);//得到檔名字尾 .png等 if(suffix==null||suffix.equals(".")){ return R.error("圖片格式不正確").put("code", LexueConstant.PHOTO_ERROR); } //BMP、GIF、JPEG、PNG if(!(suffix.equals(".png")||suffix.equals(".bmp")||suffix.equals(".jpeg") ||suffix.equals(".gif")||suffix.equals(".jpg")||suffix.equals(".PNG") ||suffix.equals(".BMP")||suffix.equals(".JPEG")||suffix.equals(".GIF") ||suffix.equals(".JPG"))){ return R.error("圖片格式不正確").put("code", LexueConstant.PHOTO_ERROR); } if (StringUtils.isBlank(suffix)) { return R.error("圖片格式不正確-isBlank()").put("code", LexueConstant.PHOTO_ERROR); } //判斷檔案的大小 long size = file.getSize();//這個方法獲取得到的是位元，也就是位元組 if(size>=1048576*10){ return R.error("圖片大小不能超過10M").put("code", LexueConstant.PHOTO_SIZE); } // 生成隨機檔名 String name = UUID.randomUUID().toString().replaceAll("-", "") + suffix; //獲取當前專案下圖片儲存的路徑 String uploadPath = null; try { // c:\\a2295929271\ ..... uploadPath = new File("").getCanonicalPath() + File.separator + "lexue"; } catch (IOException e) { throw new RuntimeException("獲取專案路徑失敗", e); } // 確定檔案存放的路徑 String ans = uploadPath + File.separator + "file" + File.separator + "photo" + File.separator + name; File dest = new File(ans); try { // 儲存檔案 file.transferTo(dest); } catch (IOException e) { throw new RuntimeException("上傳檔案失敗,伺服器發生異常!", e); } String result = domain + File.separator + name; return R.ok().put("code", LexueConstant.SUCCESS).put("url",result); } }
postman測試出現錯誤：
2021-12-06 16:46:50,228 ERROR [http-nio-9000-exec-1] o.a.c.c.C.[.[.[.[dispatcherServlet] [DirectJDKLog.java:175] Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size exceeded; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.impl.FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes.] with root cause org.apache.tomcat.util.http.fileupload.impl.FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes. at org.apache.tomcat.util.http.fileupload.impl.FileItemStreamImpl$1.raiseError(FileItemStreamImpl.java:114) at org.apache.tomcat.util.http.fileupload.util.LimitedInputStream.checkLimit(LimitedInputStream.java:76) at org.apache.tomcat.util.http.fileupload.util.LimitedInputStream.read(LimitedInputStream.java:135) at java.base/java.io.FilterInputStream.read(FilterInputStream.java:106) at org.apache.tomcat.util.http.fileupload.util.Streams.copy(Streams.java:98) at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:291) at org.apache.catalina.connector.Request.parseParts(Request.java:2895) at org.apache.catalina.connector.Request.getParts(Request.java:2797) at org.apache.catalina.connector.RequestFacade.getParts(RequestFacade.java:1098) at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:95) at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.<init>(StandardMultipartHttpServletRequest.java:88) at org.springframework.web.multipart.support.StandardServletMultipartResolver.resolveMultipart(StandardServletMultipartResolver.java:87) at org.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1178) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1012) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) at javax.servlet.http.HttpServlet.service(HttpServlet.java:626) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:888) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1597) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:832)
檔案大小不適合。加上配置：
#設定上傳檔案的大小限制，預設是1M，遠遠不夠用
# spring.servlet.multipart.max-file-size=500MB
# spring.servlet.multipart.max-request-size=500MB再次測試：
返回的連結作為下次圖片獲取的連線。直接訪問就能得到、。發現似乎連線有錯誤。
更改程式碼：
再次訪問：
完成！
本文來自部落格園，作者：五行缺知識，轉載請註明原文連結：https://www.cnblogs.com/wyw123456/p/15650644.html