微信 java 实现js-sdk 图片上传下载完整流程

<code class="hljs cs">wx.config({  debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。  appId: '', // 必填，公众号的唯一标识  timestamp: , // 必填，生成签名的时间戳  nonceStr: '', // 必填，生成签名的随机串  signature: '',// 必填，签名，见附录1  jsApiList: [] // 必填，需要使用的JS接口列表，所有JS接口列表见附录2});</code>

<code class="hljs avrasm">import java.util.UUID;import java.util.Map;import java.util.HashMap;import java.util.Formatter;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.io.UnsupportedEncodingException; public class WxConfig {  public static void main(String[] args) {    String jsapi_ticket = "jsapi_ticket";     // 注意 URL 一定要动态获取，不能 hardcode    String url = "http://example.com";    Map<string, string=""> ret = sign(jsapi_ticket, url);    for (Map.Entry entry : ret.entrySet()) {      System.out.println(entry.getKey() + ", " + entry.getValue());    }  };   public static Map<string, string=""> sign(String jsapi_ticket, String url) {    Map<string, string=""> ret = new HashMap<string, string="">();    String nonce_str = create_nonce_str();    String timestamp = create_timestamp();    String string1;    String signature = "";     //注意这里参数名必须全部小写，且必须有序    string1 = "jsapi_ticket=" + jsapi_ticket +        "&noncestr=" + nonce_str +        "×tamp=" + timestamp +        "&url=" + url;    System.out.println(string1);     try    {      MessageDigest crypt = MessageDigest.getInstance("SHA-1");      crypt.reset();      crypt.update(string1.getBytes("UTF-8"));      signature = byteToHex(crypt.digest());    }    catch (NoSuchAlgorithmException e)    {      e.printStackTrace();    }    catch (UnsupportedEncodingException e)    {      e.printStackTrace();    }     ret.put("url", url);    ret.put("jsapi_ticket", jsapi_ticket);    ret.put("nonceStr", nonce_str);    ret.put("timestamp", timestamp);    ret.put("signature", signature);     return ret;  }   private static String byteToHex(final byte[] hash) {    Formatter formatter = new Formatter();    for (byte b : hash)    {      formatter.format("%02x", b);    }    String result = formatter.toString();    formatter.close();    return result;  }   private static String create_nonce_str() {    return UUID.randomUUID().toString();  }   private static String create_timestamp() {    return Long.toString(System.currentTimeMillis() / 1000);  }}</string,></string,></string,></string,></code>

<code class="hljs cs">public static String getTicket(String accessToken) throws ParseException, IOException {    public final static String sign_ticket_create_url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=ACCESS_TOKEN&type=jsapi";    JSONObject jsonObject = new JSONObject();    JSONObject postjson=new JSONObject();    String ticket =null;    String url = sign_ticket_create_url.replace("ACCESS_TOKEN",accessToken);    System.out.print("url="+url);    String ticketurl ="";    try {      jsonObject = WeixinUtil.httpsRequest(url, "POST",postjson.toString());      ticket= jsonObject.getString("ticket");      System.out.println("ticket:"+ticket);    }catch (Exception e) {      e.printStackTrace();    }    return ticket;  };</code>

<code class="hljs javascript">wx.ready(function(){    //拍照或从手机相册中选图接口    wx.chooseImage({      count: 1, // 最多能选择多少张图片，默认9      sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有      sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有      success: function (res) {        var localIds = res.localIds; // 返回选定照片的本地ID列表，localId可以作为img标签的src属性显示图片        //上传图片接口        wx.uploadImage({          localId: localIds.toString(), // 需要上传的图片的本地ID，由chooseImage接口获得          isShowProgressTips: 1, // 默认为1，显示进度提示          success: function (res) {            var serverId = res.serverId; // 返回图片的服务器端ID          }        });      }    });  });</code>

<code class="hljs java">import org.apache.log4j.Level;import org.apache.log4j.LogManager;import org.apache.log4j.Logger;import org.apache.log4j.Priority;import org.springframework.util.StringUtils; import java.io.*;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLConnection; public class DloadImgUtil { /**  * 根据内容类型判断文件扩展名  *  * @param contentType 内容类型  * @return  */ public static String getFileexpandedName(String contentType) {  String fileEndWitsh = "";  if ("image/jpeg".equals(contentType))   fileEndWitsh = ".jpg";  else if ("audio/mpeg".equals(contentType))   fileEndWitsh = ".mp3";  else if ("audio/amr".equals(contentType))   fileEndWitsh = ".amr";  else if ("video/mp4".equals(contentType))   fileEndWitsh = ".mp4";  else if ("video/mpeg4".equals(contentType))   fileEndWitsh = ".mp4";  return fileEndWitsh; } /**  * 获取媒体文件  * @param accessToken 接口访问凭证  * @param mediaId 媒体文件id  * @param savePath 文件在本地服务器上的存储路径  * */ public static String downloadMedia(String accessToken, String mediaId, String savePath) {  try {   accessToken = WeixinUtil.getAccessToken1().getToken();  } catch (IOException e) {   e.printStackTrace();  }  String filePath = null;  // 拼接请求地址  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);  try {   URL url = new URL(requestUrl);   HttpURLConnection conn = (HttpURLConnection) url.openConnection();   conn.setDoInput(true);   conn.setRequestMethod("GET");    if (!savePath.endsWith("/")) {    savePath += "/";   }   // 根据内容类型获取扩展名   String fileExt = DloadImgUtil .getFileexpandedName(conn.getHeaderField("Content-Type"));   // 将mediaId作为文件名   filePath = savePath + mediaId + fileExt;   BufferedInputStream bis = new BufferedInputStream(conn.getInputStream());   FileOutputStream fos = new FileOutputStream(new File(filePath));   byte[] buf = new byte[8096];   int size = 0;   while ((size = bis.read(buf)) != -1)    fos.write(buf, 0, size);   fos.close();   bis.close();    conn.disconnect();   String info = String.format("下载媒体文件成功，filePath=" + filePath);   System.out.println(info);  } catch (Exception e) {   filePath = null;   String error = String.format("下载媒体文件失败：%s", e);   System.out.println(error);  }  return filePath; }}</code>