以Java web的方式显示图片到浏览器以Java web的方式下载服务器文件到浏览器

以Spring Boot的方式显示图片或下载文件到浏览器
请求例子：http://localhost:8080/image/1564550185144.jpeg

示例代码：

import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;import java.io.File;import java.io.IOException;@Configurationpublic class ImageShow implements WebMvcConfigurer { @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { File directory = new File("image"); String path = null; try { path = directory.getCanonicalPath(); }catch (IOException e){ e.printStackTrace(); } registry.addResourceHandler("/image/**").addResourceLocations("file:"+path+"/"); }}

运行结果：

显示图片

下载文件

补充：springboot 下载图片并输出浏览器

@GetMapping(value = "v1/returnGroupCode",produces = MediaType.IMAGE_JPEG_VALUE) public byte[] returnGroupCode(@RequestParam("seriesUniqueCode") String seriesUniqueCode){ URL url = null; InputStream is = null; ByteArrayOutputStream outStream = null; HttpURLConnection httpUrl = null; try{ url = new URL(pdGroupcodeSeriesInfo.getQrCodeUrl()); httpUrl = (HttpURLConnection) url.openConnection(); httpUrl.connect(); httpUrl.getInputStream(); is = httpUrl.getInputStream(); outStream = new ByteArrayOutputStream(); //创建一个Buffer字符串 byte[] buffer = new byte[1024]; //每次读取的字符串长度，如果为-1，代表全部读取完毕 int len = 0; //使用一个输入流从buffer里把数据读取出来 while( (len=is.read(buffer)) != -1 ){ //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度 outStream.write(buffer, 0, len); } byte[] temp = outStream.toByteArray(); return temp; }

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