Java如何从服务器中下载图片

本文实例为大家分享了java服务器中下载图片的方法，供大家参考，具体内容如下

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); 
   } 
  }

以上就是本文的全部内容，希望对大家的学习有所帮助。