1.将要回复的图片上传至微信服务器成为永久素材，本人之前使用的是上传临时素材，实践久了，感觉临时素材多有不便，便决定使用永久素材的方式，下面是上传永久素材的实现办法：
/**
* 上传其他永久素材(图片素材的上限为5000，其他类型为1000)
*
* @return
* @throws Exception
*/
public static JSONObject addMaterialEver(String fileurl, String type, String token) {
try {
File file = new File(fileurl);
//上传素材
String path = "https://api.weixin.qq.com/cgi-bin/material/add_material?access_token=" + token + "&type=" + type;
String result = connectHttpsByPost(path, null, file);
result = result.replaceAll("[\\\\]", "");
log.info("result:" + result);
JSONObject resultJSON = JSONObject.fromObject(result);
if (resultJSON != null) {
if (resultJSON.get("media_id") != null) {
log.info("上传" + type + "永久素材成功");
return resultJSON;
} else {
log.info("上传" + type + "永久素材失败");
}
}
return null;
} catch (IOException e) {
log.error(e.getMessage(),e);
} catch (NoSuchAlgorithmException e) {
log.error(e.getMessage(),e);
} catch (NoSuchProviderException e) {
log.error(e.getMessage(),e);
} catch (KeyManagementException e) {
log.error(e.getMessage(),e);
}
return null;
}
public static String connectHttpsByPost(String path, String KK, File file) throws IOException, NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException {
URL urlObj = new URL(path);
//连接
HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();
String result = null;
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false); // post方式不能使用缓存
// 设置请求头信息
con.setRequestProperty("Connection", "Keep-Alive");
con.setRequestProperty("Charset", "UTF-8");
// 设置边界
String BOUNDARY = "----------" + System.currentTimeMillis();
con.setRequestProperty("Content-Type",
"multipart/form-data; boundary="
+ BOUNDARY);
// 请求正文信息
// 第一部分：
StringBuilder sb = new StringBuilder();
sb.append("--"); // 必须多两道线
sb.append(BOUNDARY);
sb.append("\r\n");
sb.append("Content-Disposition: form-data;name=\"media\";filelength=\"" + file.length() + "\";filename=\""
+ file.getName() + "\"\r\n");
sb.append("Content-Type:application/octet-stream\r\n\r\n");
byte[] head = sb.toString().getBytes("utf-8");
// 获得输出流
OutputStream out = new DataOutputStream(con.getOutputStream());
// 输出表头
out.write(head);
// 文件正文部分
// 把文件已流文件的方式 推入到url中
DataInputStream in = new DataInputStream(new FileInputStream(file));
int bytes = 0;
byte[] bufferOut = new byte[1024];
while ((bytes = in.read(bufferOut)) != -1) {
out.write(bufferOut, 0, bytes);
}
in.close();
// 结尾部分
byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定义最后数据分隔线
out.write(foot);
out.flush();
out.close();
StringBuffer buffer = new StringBuffer();
BufferedReader reader = null;
try {
// 定义BufferedReader输入流来读取URL的响应
reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
if (result == null) {
result = buffer.toString();
}
} catch (IOException e) {
log.info("发送POST请求出现异常！" + e);
log.error(e.getMessage(),e);
} finally {
if (reader != null) {
reader.close();
}
}
return result;
}
/**
* 测试上传图片至微信服务器获得media_id
* @param args
*/
public static void main(String[] args) {
try {
//获得Access_token的方法，请自行百度
String token = Access_tokenDemo.getSavedAccess_token();
String path = "E:\\app.jpg";
JSONObject object = addMaterialEver(path,"image",token);
boolean b=object.containsKey("media_id");
if (b==true) {
String media_id=object.getString("media_id");
System.out.println("media_id:"+media_id);
}
log.info(object.toString());
} catch (Exception e) {
log.error(e.getMessage(),e);
}
}项目运行，获得mediaId,下面是请求成功后返回的json:
{"media_id":"KpCBpHKEjL3J7gA","url":"http://mmbiz.qpic.cn/mmbiz_jpg/lfR5iby6iaKT6ibLhic1Rvp4jft70nZY5N0da4Fx27ujQ/0?wx_fmt=jpeg"}获得media_id后，就可用来回复图片，下面是调用的过程：
/**
* 使用永久素材回复图片信息
* 测试用
* @param toUserName
* @param fromUserName
* @return
*/
public static String returnIMGMessage(String toUserName,String fromUserName){
String mediaId="Kphhsheut1lyAziUfJ7gA";
String imgMsg=MessageUtil.initImageMessage(mediaId, toUserName, fromUserName);
return imgMsg;
}下面附上回复图片xml的方法initImageMessage：
/**
* 组装图片xml
* @MethodName：initImageMessage
*@author:
*@ReturnType:String
*@param MediaId
*@param toUserName
*@param fromUserName
*@return
*/
public static String initImageMessage(String MediaId,String toUserName,String fromUserName){
String message = null;
Image image=new Image();
image.setMediaId(MediaId);
ImageMessage imageMessage = new ImageMessage();
imageMessage.setFromUserName(toUserName);
imageMessage.setToUserName(fromUserName);
imageMessage.setCreateTime(new Date().getTime());
imageMessage.setImage(image);
imageMessage.setMsgType(REQ_MESSAGE_TYPE_IMAGE);
message = imageMessageToXml(imageMessage);
return message;
}
/**
* 图片转成xml
* @MethodName：textMessageToXml
*@author:maliran
*@ReturnType:String
*@param textMessage
*@return
*/
public static String imageMessageToXml(ImageMessage imageMessage){
xstream.alias("xml", imageMessage.getClass());
return xstream.toXML(imageMessage);
}
/**
* 扩展xstream，使其支持CDATA块
*
* @date 2013-05-19
*/
private static XStream xstream = new XStream(new XppDriver() {
public HierarchicalStreamWriter createWriter(Writer out) {
return new PrettyPrintWriter(out) {
// 对所有xml节点的转换都增加CDATA标记
boolean cdata = true;
@SuppressWarnings("unchecked")
public void startNode(String name, Class clazz) {
super.startNode(name, clazz);
}
protected void writeText(QuickWriter writer, String text) {
if (cdata) {
writer.write("<![CDATA[");
writer.write(text);
writer.write("]]>");
} else {
writer.write(text);
}
}
};
}
}); 上面initImageMessage方法中Image类为自己定义的，它只有一个属性MediaId,下边一并给出Image和ImageMessage类的代码：
@Data
public class ImageMessage extends BaseMessage {
private Image Image;
}
@Data
public class Image {
private String MediaId;
}亲测可用！
