2-4 图片消息的自动回复

https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140543

回复图片消息

下面获取 MediaId

打开素材管理 -> 新增临时素材

/Weixin/src/com/imooc/util/WeixinUtil.java

package com.imooc.util;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;


import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import com.imooc.po.AccessToken;

import net.sf.json.JSONObject;

public class WeixinUtil {

	private static final String APPID = "wx3041db7fcb232fd7";
	private static final String APPSECRET = "b2e7836bb3362339bd168d66d436cb7a";
	private static final String ACCESS_TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
	
	private static final String UPLOAD_URL = "https://api.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE";
	
	public static JSONObject doGetStr(String url){
		DefaultHttpClient httpClient = new DefaultHttpClient();
		HttpGet httpGet = new HttpGet(url);
		JSONObject jsonObject = null;
		
		 try {
			 
			HttpResponse response = httpClient.execute(httpGet);
			HttpEntity entity = response.getEntity();
			
			if(entity != null){
				String result = EntityUtils.toString(entity,"UTF-8");
				jsonObject  = JSONObject.fromObject(result);
			}
		 
		 } catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		 return jsonObject;
	}
	
	
	public static JSONObject doPostStr(String url,String outStr){
		DefaultHttpClient httpClient = new DefaultHttpClient();
		HttpPost httpPost = new HttpPost(url);
		JSONObject jsonObject = null;
		
		try {
			 httpPost.setEntity(new StringEntity(outStr,"UTF-8"));
			 HttpResponse response = httpClient.execute(httpPost);
			 String result = EntityUtils.toString(response.getEntity(),"UTF-8");
			 jsonObject = JSONObject.fromObject(result);

		} catch (Exception e) {
			e.printStackTrace();
		}
		return jsonObject;
	}
	
	/**
	 * 获取 access_token
	 * @return
	 */
	public static AccessToken getAccessToken(){
		AccessToken token = new AccessToken();
		String url = ACCESS_TOKEN_URL.replace("APPID", APPID).replace("APPSECRET", APPSECRET);
		JSONObject jsonObject = doGetStr(url);
		if(jsonObject != null){
			token.setToken(jsonObject.getString("access_token"));
			token.setExpiresIn(jsonObject.getInt("expires_in"));
		}
		return token;
	}
	
	/**
	 * 文件上传
	 * @param filePath
	 * @param accessToken
	 * @param type
	 * @return
	 * @throws IOException
	 * @throws NoSuchAlgorithmException
	 * @throws NoSuchProviderException
	 * @throws KeyManagementException
	 */
	public static String upload(String filePath, String accessToken,String type) throws IOException, NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException {
		File file = new File(filePath);
		if (!file.exists() || !file.isFile()) {
			throw new IOException("文件不存在");
		}

		String url = UPLOAD_URL.replace("ACCESS_TOKEN", accessToken).replace("TYPE",type);
		
		URL urlObj = new URL(url);
		//连接
		HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();

		con.setRequestMethod("POST"); 
		con.setDoInput(true);
		con.setDoOutput(true);
		con.setUseCaches(false); 

		//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);

		StringBuilder sb = new StringBuilder();
		sb.append("--");
		sb.append(BOUNDARY);
		sb.append("\r\n");
		sb.append("Content-Disposition: form-data;name=\"file\";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;
		String result = 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) {
			e.printStackTrace();
		} finally {
			if (reader != null) {
				reader.close();
			}
		}

		JSONObject jsonObj = JSONObject.fromObject(result);
		System.out.println(jsonObj);
		String typeName = "media_id";
		if(!"image".equals(type)){
			typeName = type + "_media_id";
		}
		String mediaId = jsonObj.getString(typeName);
		return mediaId;
	}
	
}

执行：/Weixin/src/com/imooc/test/WeixinTest.java

package com.imooc.test;

import com.imooc.po.AccessToken;
import com.imooc.util.WeixinUtil;

public class WeixinTest {

	public static void main(String[] args) {
		AccessToken token = WeixinUtil.getAccessToken();
		System.out.println("票据："+token.getToken());
		System.out.println("有效时间："+token.getExpiresIn());
		
		String path = "G:/imooc.jpg";
		try {
			
			String mediaId = WeixinUtil.upload(path, token.getToken(), "image");
			System.out.println(mediaId);
		
		
		}  catch (Exception e) {
			e.printStackTrace();
		}
		
	}
}

输出结果：

/Weixin/src/com/imooc/po/Image.java

package com.imooc.po;

public class Image {
	private String MediaId;

	public String getMediaId() {
		return MediaId;
	}

	public void setMediaId(String mediaId) {
		MediaId = mediaId;
	}
	
	
}

/Weixin/src/com/imooc/po/ImageMessage.java

package com.imooc.po;

public class ImageMessage extends BaseMessage{
	private Image Image;

	public Image getImage() {
		return Image;
	}

	public void setImage(Image image) {
		Image = image;
	}
	
	
}

在 /Weixin/src/com/imooc/util/MessageUtil.java 添加方法

	/**
	 * 组装图片消息
	 * @param toUserName
	 * @param fromUserName
	 * @return
	 */
	public static String initImageMessage(String toUserName,String fromUserName){
		String message = null;
		Image image = new Image();
		image.setMediaId("o6k7h1lwDwu0Btjp741WGSRqNhUso8aW1iM5bziSmO9uaalXnBVVmGanNgY8Ggpv");
		ImageMessage imageMessage = new ImageMessage();
		imageMessage.setFromUserName(toUserName);
		imageMessage.setToUserName(fromUserName);
		imageMessage.setMsgType(MESSAGE_IMAGE);
		imageMessage.setCreateTime(new Date().getTime());
		imageMessage.setImage(image);
		message = imageMessageToXml(imageMessage);
		return message;
	}

	public static String imageMessageToXml(ImageMessage imageMessage){
		
		XStream xstream = new XStream();
		xstream.alias("xml", imageMessage.getClass());
		
		return xstream.toXML(imageMessage);
	}

使用

2-4 图片消息的自动回复

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