以Java web的方式顯示圖片到瀏覽器以Java web的方式下載服務器文件到瀏覽器

以Spring Boot的方式顯示圖片或下載文件到瀏覽器請求例子：http://localhost:8080/image/1564550185144.jpeg

示例代碼：

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+'/'); }}

運行結果：

顯示圖片

下載文件

補充：springboot 下載圖片并輸出瀏覽器

@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(); //創建一個Buffer字符串 byte[] buffer = new byte[1024]; //每次讀取的字符串長度，如果為-1，代表全部讀取完畢 int len = 0; //使用一個輸入流從buffer里把數據讀取出來 while( (len=is.read(buffer)) != -1 ){//用輸出流往buffer里寫入數據，中間參數代表從哪個位置開始讀，len代表讀取的長度outStream.write(buffer, 0, len); } byte[] temp = outStream.toByteArray(); return temp; }

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