java 实现微信服务器下载图片到自己服务器

 java 实现微信服务器下载图片到自己服务器

          此功能的实现需要注意java 中io流的操作及网路开发，

          实现代码：

/** 
 * @author why 
 * 
 */ 
public class picdownload { 
 
  /** 
   * 
   * 根据文件id下载文件 
   * 
   * 
   * 
   * @param mediaid 
   * 
   *      媒体id 
   * 
   * @throws exception 
   */ 
 
  public static inputstream getinputstream(string accesstoken, string mediaid) { 
    inputstream is = null; 
    string url = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=" 
        + accesstoken + "&media_id=" + mediaid; 
    try { 
      url urlget = new url(url); 
      httpurlconnection http = (httpurlconnection) urlget 
          .openconnection(); 
      http.setrequestmethod("get"); // 必须是get方式请求 
      http.setrequestproperty("content-type", 
          "application/x-www-form-urlencoded"); 
      http.setdooutput(true); 
      http.setdoinput(true); 
      system.setproperty("sun.net.client.defaultconnecttimeout", "30000");// 连接超时30秒 
      system.setproperty("sun.net.client.defaultreadtimeout", "30000"); // 读取超时30秒 
      http.connect(); 
      // 获取文件转化为byte流 
      is = http.getinputstream(); 
 
    } catch (exception e) { 
      e.printstacktrace(); 
    } 
    return is; 
 
  } 
 
  /** 
   * 
   * 获取下载图片信息（jpg） 
   * 
   * 
   * 
   * @param mediaid 
   * 
   *      文件的id 
   * 
   * @throws exception 
   */ 
 
  public static void saveimagetodisk(string accesstoken, string mediaid, string picname, string picpath) 
      throws exception { 
    inputstream inputstream = getinputstream(accesstoken, mediaid); 
    byte[] data = new byte[10240]; 
    int len = 0; 
    fileoutputstream fileoutputstream = null; 
    try { 
      fileoutputstream = new fileoutputstream(picpath+picname+".jpg"); 
      while ((len = inputstream.read(data)) != -1) { 
        fileoutputstream.write(data, 0, len); 
      } 
    } catch (ioexception e) { 
      e.printstacktrace(); 
    } finally { 
      if (inputstream != null) { 
        try { 
          inputstream.close(); 
        } catch (ioexception e) { 
          e.printstacktrace(); 
        } 
      } 
      if (fileoutputstream != null) { 
        try { 
          fileoutputstream.close(); 
        } catch (ioexception e) { 
          e.printstacktrace(); 
        } 
      } 
    } 
  } 
 
  /** 
   * 图片下载 
   * 
   * @param accesstoken 
   * @param mediaid 
   */ 
  public static void getpic(string accesstoken, string mediaid) { 
    string requesturl = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token=access_token&media_id=media_id"; 
    requesturl = requesturl.replace("access_token", accesstoken).replace( 
        "media_id", mediaid); 
    jsonobject jsonobject = weixinutil.httprequest(requesturl, "get", null); 
    system.out.println(jsonobject); 
  } 
 
  public static void main(string[] args) throws exception { 
    string accesstoken = ""; 
    string mediaid = ""; 
    string picname = ""; 
    saveimagetodisk(accesstoken, mediaid, picname,"f:/"); 
  } 
} 

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