springboot 上传图片与回显
在网上找了很多例子,不能完全契合自己的需求,自行整理了下。需求是这样的:项目小,所以不需要单独的图片服务器,图片保存在服务器中任意的地方,并且可以通过访问服务器来获取图片。话不多说上代码:
1、依赖
<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> <!-- apache.commons --> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.6</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-io</artifactId> <version>1.3.2</version> </dependency>
2、文件上传工具类
package com.slovi.utils; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import org.apache.commons.io.FilenameUtils; import org.apache.commons.io.IOUtils; import org.springframework.web.multipart.MultipartFile; public class FileUpload { /** * 文件上传处理 * * @param file * @return */ public static String writeUploadFile(MultipartFile file,String module) { String filename = file.getOriginalFilename(); String realpath = "D:/rentHouse/" + module +"/"; File fileDir = new File(realpath); if (!fileDir.exists()) fileDir.mkdirs(); String extname = FilenameUtils.getExtension(filename); String allowImgFormat = "gif,jpg,jpeg,png"; if (!allowImgFormat.contains(extname.toLowerCase())) { return "NOT_IMAGE"; } filename = Math.abs(file.getOriginalFilename().hashCode()) + RandomUtils.createRandomString( 4 ) + "." + extname; InputStream input = null; FileOutputStream fos = null; try { input = file.getInputStream(); fos = new FileOutputStream(realpath + "/" + filename); IOUtils.copy(input, fos); } catch (Exception e) { e.printStackTrace(); return null; } finally { IOUtils.closeQuietly(input); IOUtils.closeQuietly(fos); } return "/" + filename; } }
3、随机数生成工具类
package com.slovi.utils; public class RandomUtils { private static final String charlist = "0123456789"; public static String createRandomString(int len) { String str = new String(); for (int i = 0; i < len; i++) { str += charlist.charAt(getRandom(charlist.length())); } return str; } public static int getRandom(int mod) { if (mod < 1) { return 0; } int ret = getInt() % mod; return ret; } private static int getInt() { int ret = Math.abs(Long.valueOf(getRandomNumString()).intValue()); return ret; } private static String getRandomNumString() { double d = Math.random(); String dStr = String.valueOf(d).replaceAll("[^\\d]", ""); if (dStr.length() > 1) { dStr = dStr.substring(0, dStr.length() - 1); } return dStr; } }
4、控制类
package com.slovi.controller; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.multipart.MultipartFile; import com.slovi.utils.FileUpload; @RestController @RequestMapping("/Advert") public class AdvertController { @Autowired private AdvertInfoService advertInfoService; @PostMapping("/upload") public Object upload(@RequestParam("file") MultipartFile file) { String filename = FileUpload.writeUploadFile(file,"advert"); return filename; } }
5、配置类
package com.slovi.config; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; @Configuration public class WebMvcConfig implements WebMvcConfigurer { @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/"); registry.addResourceHandler("/advertIMG/**").addResourceLocations("file:D:/rentHouse/"); } }
6、测试页面,放到resources/templates包下
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"/> <title>Title</title> </head> <body> <form action="/upload" th:action="@{/upload}" method="post" enctype="multipart/form-data" > <label>上传图片</label> <input type="file" name="file"/> <input type="submit" value="上传"/> </form> </body> </html>
启动项目,访问:localhost:8888,进入上传页面,上传成功会返回图片名称,例如:11348371257146.jpg,然后访问http://localhost:8888/advertIMG/11348371257146.jpg,可以获取到图片。