[Java知识库]springboot 图片上传预览显示

application.yml配置文件上传路径

#文件存储路径
filepath:
  sourcePath: /data/img/

图片上传预览controller

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;
@Api(tags = "图片上传接口")
@RestController
@RequestMapping("/api/file")
@Slf4j
public class FileController {

    @Value("${filepath.sourcePath}")
    private String filepath;

    /**
     * 处理文件上传
     */
    @PostMapping(value = "/upload")
    public String uploading(@RequestParam("file") MultipartFile file) {
        String fileName = file.getOriginalFilename();  // 文件名
        String suffixName = fileName.substring(fileName.lastIndexOf("."));  // 后缀名
        String filePath = filepath; // 上传后的路径
        fileName = UUID.randomUUID() + suffixName; // 新文件名
        File dest = new File(filePath + fileName);
        if (!dest.getParentFile().exists()) {
            dest.getParentFile().mkdirs();
        }
        try {
            file.transferTo(dest);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return fileName;
    }

    
    /**
     * 返回前端图片输出流数据
     * @param response
     * @param imgId  图片名称加后缀
     * @return
     * @throws Exception
     */
    @ApiOperation("返回前端图片输出流数据")
    @GetMapping(value = "/image",produces = MediaType.IMAGE_JPEG_VALUE)
    @ResponseBody
    public byte[] getImage(HttpServletResponse response,@ApiParam("图片名称+后缀格式") String imgId) throws Exception {
        File file = new File(filepath  + imgId);
        FileInputStream inputStream = new FileInputStream(file);
        byte[] bytes = new byte[inputStream.available()];
        inputStream.read(bytes, 0, inputStream.available());
        return bytes;
    }


}

上传图片调用upload方法，成功后返回图片名称。

显示图片调image接口传入图片名称。