Java如何从服务器中下载图片

 import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.URL; import java.net.URLConnection; import org.apache.commons.io.IOUtils; /** * 从服务器中下载图片 * * @param fileName 图片地址 * @param response * @return */ @RequestMapping(value = "/download") public void downloadMedia(HttpServletResponse response, HttpServletRequest request) { InputStream inputStream = null; OutputStream outputStream = null; try { //处理中文乱码 request.setCharacterEncoding("UTF-8"); String fileName = request.getParameter("fileName"); fileName = new String(fileName.getBytes("iso8859-1"),"UTF-8"); //处理浏览器兼容 response.setContentType("application/msexcel;charset=utf-8");//定义输出类型 Enumeration enumeration = request.getHeaders("User-Agent"); String browserName = (String) enumeration.nextElement(); boolean isMSIE = browserName.contains("MSIE"); if (isMSIE) { response.addHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "UTF8")); } else { response.addHeader("Content-Disposition", "attachment;fileName=" + new String(fileName.getBytes("gb2312"), "ISO8859-1")); } //url地址如果存在空格，会导致报错！  解决方法为：用+或者%20代替url参数中的空格。 fileName = fileName.replace(" ", "%20"); //图片下载 URL url = new URL(fileName); URLConnection conn = url.openConnection(); outputStream = response.getOutputStream(); inputStream = conn.getInputStream(); IOUtils.copy(inputStream, outputStream); } catch (IOException e) { System.err.println(e); }finally { IOUtils.closeQuietly(inputStream); IOUtils.closeQuietly(outputStream); } }