文件上传的三种存储方式
1、本地上传
- 新建springboot项目，引入Thymeleaf、web相关依赖：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
- 在项目resource目录下新建templates文件夹并创建上传文件页面upload.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>文件上传</title>
</head>
<body>
<form action="upload" method="post" enctype="multipart/form-data">
选择文件:<input type="file" name="file">
<input type="submit" value="提交">
</form>
</body>
</html>
- 创建success.html页面：
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>上传成功</title>
</head>
<body>
<div th:if="${fileName}">
<h2 th:text="|${fileName} 上传成功，存储路径为 :${path}|"> </h2>
</div>
</body>
</html>
- 再创建一个error.html页面
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>上传失败</title>
</head>
<body>
<div th:if="${fileName}">
<h2 th:text="|${fileName} 上传失败，失败原因为 :${msg}|"> </h2>
</div>
</body>
</html>
- 新建uploadController
@Controller
@RequestMapping("/")
public class UploadController {
@Autowired
private UploadService uploadService;
@GetMapping("/upload")
public String to_upload(){
return "upload";
}
@PostMapping("/upload")
public String upload(MultipartFile file, HttpServletRequest request, Model model){
if (file!=null){
Map map=uploadService.localUpload(file);
model.addAllAttributes(map);
return "success";
}
model.addAttribute("fileName",file.getOriginalFilename());
model.addAttribute("msg","参数错误！");
return "error";
}
}
- service
public interface UploadService {
Map<String,Object> localUpload(MultipartFile file);
}
- service实现类
@Service
public class UploadServiceImpl implements UploadService {
@Override
public Map<String, Object> localUpload(MultipartFile file) {
Map<String, Object> resultMap=new HashMap<>(2);
try {
//原文件名加上时间戳作为上传后保存的文件名
String fileName=System.currentTimeMillis()+file.getOriginalFilename();
//指定目标文件名，此处将文件保存在项目的resource目录下，也可以保存在本地的其他目录下
String destFileName=System.getProperty("user.dir")
+File.separator+"src"
+File.separator+"main"
+File.separator+"resources"
+File.separator+"upload"
+File.separator+fileName;
//新建目标文件
File destFile = new File(destFileName);
//创建目标文件的存储路径
destFile.getParentFile().mkdirs();
//将前端接收的文件转化为目标文件
file.transferTo(destFile);
//将上传后的文件名和存储路径返回
resultMap.put("fileName",fileName);
resultMap.put("path",destFile);
} catch (IOException e) {
e.printStackTrace();
}
return resultMap;
}
}
- 在项目的resource目录新建application.yml配置文件，添加配置信息
server:
port: 8899 #端口
spring:
thymeleaf:
prefix: classpath:/templates/ #前端页面文件路径
suffix: .html #前端页面文件后缀名
- 启动项目，浏览器输入 http://localhost :8899/upload
- 选择一张名为test.jpg的图片后提交，
- 上传成功
- 在项目的resource目录下可以找到刚刚上传的文件
- 再选择一个稍微大一点的文件进行上传，一个10MB的压缩包
上传失败
控制台显示错误信息
org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes.
at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl$FileItemStreamImpl$1.raiseError(FileUploadBase.java:633) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.tomcat.util.http.fileupload.util.LimitedInputStream.checkLimit(LimitedInputStream.java:76) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.tomcat.util.http.fileupload.util.LimitedInputStream.read(LimitedInputStream.java:135) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at java.io.FilterInputStream.read(FilterInputStream.java:107) ~[na:1.8.0_201]
at org.apache.tomcat.util.http.fileupload.util.Streams.copy(Streams.java:98) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.tomcat.util.http.fileupload.util.Streams.copy(Streams.java:68) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:293) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.connector.Request.parseParts(Request.java:2855) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.connector.Request.parseParameters(Request.java:3194) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.connector.Request.getParameter(Request.java:1116) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:381) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:84) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.7.RELEASE.jar:5.1.7.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200) ~[tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:836) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1747) [tomcat-embed-core-9.0.19.jar:9.0.19]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.19.jar:9.0.19]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_201]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_201]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.19.jar:9.0.19]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_201]
原因是上传的文件大小超过限制，因为默认的最大上传文件不能超过1MB，如果需要上传更大的文件，就需要在appliction.yml文件中添加以下配置：
servlet:
multipart:
max-file-size: 100MB
max-request-size: 100MB
重新启动项目，再次上传
查看resource下的upload文件夹
没问题
正文到此结束
- 本文标签： id App src db executor 配置 value ACE java https MQ CTO Connection ORM 端口 map stream XML http spring ip IO 时间 ThreadPoolExecutor Service classpath cat HashMap parse ask rmi tomcat NIO IDE 参数 Action web tar springboot HTML core 目录 servlet 图片 UI 文件上传 Property apache
- 版权声明： 本文为互联网转载文章，出处已在文章中说明(部分除外)。如果侵权，请联系本站长删除，谢谢。
- 本文海报： 生成海报一 生成海报二
热门推荐
相关文章
Loading...
![[HBLOG]公众号](https://www.liuhaihua.cn/img/qrcode_gzh.jpg)
