從服務器中下載圖片

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;

/**
 * 從服務器中下載圖片
 *
 * @param fileName  圖片地址
 * @param response
 * @return
 */
@RequestMapping(value = "/download")
public void downloadMedia(HttpServletResponse response, HttpServletRequest request) {
	InputStream inputStream = null;
	OutputStream outputStream = null;
	try {
		//處理中文亂碼
		request.setCharacterEncoding("UTF-8");
		String fileName = request.getParameter("fileName");
		fileName = new String(fileName.getBytes("iso8859-1"),"UTF-8");
		//處理瀏覽器兼容
        response.setContentType("application/msexcel;charset=utf-8");//定義輸出類型
        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地址若是存在空格，會致使報錯！   解決方法爲：用+或者%20代替url參數中的空格。
       fileName = fileName.replace(" ", "%20");
        //圖片下載
        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);  
  }  
}