springboot+thymeleaf 实现图片文件上传及回显
1. 创建一个springboot工程, 在此就不多说了(目录结构).
2. 写一个HTML页面
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.w3.org/1999/xhtml"> <head> <meta charset="UTF-8"> <link rel="stylesheet" href="../css/bootstrap.css"> <title>Title</title> </head> <body> <form action="../upload" method="post" enctype="multipart/form-data"> <input type="file" name="file" accept="image/*"> <br> <input type="submit" value="上传" class="btn btn-success"> </form> [[${filename}]] <br> <img th:src="@{${filename}}" alt="图片"> </body> </html>
3. 配置application.properties文件, 在配置文件中声明图片的绝对路径及相对路径
server.port=8899 file.upload.path=F://images/ file.upload.path.relative=/images/**
4. 创建一个MyWebAppConfigurer java文件实现WebMvcConfigurer接口, 配置资源映射路径
注: 笔者使用的springboot版本为 2.1.6
import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; /** * 资源映射路径 */ @Configuration public class MyWebAppConfigurer implements WebMvcConfigurer { /**上传地址*/ @Value("${file.upload.path}") private String filePath; /**显示相对地址*/ @Value("${file.upload.path.relative}") private String fileRelativePath; @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler(fileRelativePath). addResourceLocations("file:/" + filePath); } }
5. 编写Controller层
import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import java.io.File; import java.io.IOException; @Controller public class TestController { /**上传地址*/ @Value("${file.upload.path}") private String filePath; // 跳转上传页面 @RequestMapping("test") public String test() { return "Page"; } // 执行上传 @RequestMapping("upload") public String upload(@RequestParam("file") MultipartFile file, Model model) { // 获取上传文件名 String filename = file.getOriginalFilename(); // 定义上传文件保存路径 String path = filePath+"rotPhoto/"; // 新建文件 File filepath = new File(path, filename); // 判断路径是否存在，如果不存在就创建一个 if (!filepath.getParentFile().exists()) { filepath.getParentFile().mkdirs(); } try { // 写入文件 file.transferTo(new File(path + File.separator + filename)); } catch (IOException e) { e.printStackTrace(); } // 将src路径发送至html页面 model.addAttribute("filename", "/images/rotPhoto/"+filename); return "Page"; } }