class="java">import org.apache.commons.codec.binary.Base64;

import org.apache.log4j.LogManager;

import org.apache.log4j.Logger;

import java.io.File;

import java.io.FileOutputStream;

import java.io.OutputStream;

/**

* 文件处理工具类

*/

public class FileHelpers {

private static final Logger logger = LogManager.getLogger(FileHelpers.class);

/**

* 解析base64格式图片，并保存到临时目录

*

* @param base64Str base64格式图片

* @param file 临时文件对象

* @return File Object

* @throws Exception

*/

public static void decodeBase64ToFile(File file,String base64Str) throws Exception {

OutputStream out = null;

try {

int prefixIndex = base64Str.indexOf(",");

byte[] buffer = Base64.decodeBase64(base64Str.substring(prefixIndex + 1));

out = new FileOutputStream(file);

out.write(buffer);

out.flush();

} catch (Exception e) {

logger.debug("decodeBase64ToFile raise exception:" + e.getMessage());

throw new Exception(e.getMessage());

} finally {

if (out!=null) {

out.close();

}

}

}

}

/*********************************************/

import org.apache.http.HttpEntity;

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.client.utils.HttpClientUtils;

import org.apache.http.entity.mime.MultipartEntityBuilder;

import org.apache.http.entity.mime.content.FileBody;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.util.EntityUtils;

import org.apache.logging.log4j.LogManager;

import org.apache.logging.log4j.Logger;

import java.io.File;

import java.util.Map;

public class WeixinMediaUtils {

private final Logger logger = LogManager.getLogger(ServiceWeixinMedias.class);

/**

* 卡券 上传图片接口

*

* @param accessToken 开放平台/或者公众平台的accessToken

* @param imgStream 图片base64字符串

* @return 上传成功后，返回的图片Url

*/

public static Map uploadimg(String accessToken, String imgStream) {

File tempFile = null;

CloseableHttpClient httpClient = null;

CloseableHttpResponse response = null;

try {

String url = String.format("%s%s",

"https://api.weixin.qq.com/cgi-bin/media/uploadimg",

"ACCESS_TOKEN="+accessToken))

);

tempFile = File.createTempFile("weixin_media", ".jpg");

FileHelpers.decodeBase64ToFile(tempFile, imgStream);

HttpPost httpPost = new HttpPost(url);

FileBody fileBody = new FileBody(tempFile);

HttpEntity httpEntity = MultipartEntityBuilder.create().addPart("buffer", fileBody).build();

httpPost.setEntity(httpEntity);

httpClient = HttpClients.createDefault();

response = httpClient.execute(httpPost);

HttpEntity responseEntity = response.getEntity();

if (responseEntity != null) {

String responseEntityStr = EntityUtils.toString(response.getEntity());

System.out.println(responseEntityStr);

System.out.println("Response content length: " + responseEntity.getContentLength());

return JsonHelpers.deserializeToMap(responseEntityStr).orElseThrow(() -> new Exception("uploadimg failed,response realizeToMap raise Exception"));

} else {

throw new Exception(String.format("call weixin interface fail,file 【%s】 upload fail", tempFile.getAbsolutePath()));

}

} catch (Throwable t) {

t.printStackTrace();

throw new Exception(t.getMessage());

} finally {

if (tempFile!=null) {

tempFile.delete();

}

if (httpClient!=null) {

HttpClientUtils.closeQuietly(httpClient);

}

if (response!=null) {

HttpClientUtils.closeQuietly(response);

}

}

}

? ? Java使用HttpClient，将Base64图片上传到微信！！

? ? 诸多不完善之处，敬请指正！