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:
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/**
* @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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原文链接:http://blog.csdn.net/u011072139/article/details/47108761