蓝信上传附件接口调用(JAVA)

上传附件接口说明（https://docs.lanxin.cn/base.html#nav3-2-1）

步骤

1.  定义数据分隔线boundary( 长度建议10位以上 )
2.  与微/蓝信服务器建立连接（HttpURLConnection）
3.  获取要上传的文件输出流，构造请求体等相关参数开始向微/蓝信服务器写数据（form-data中媒体文件标识，有filename、filelength、content-type等信息，其中file的表单名称为media ）。
4. 上传文件后读取微/蓝信服务器返回的内容，并解析为json格式返回（定义BufferedReader输入流来读取URL的响应）

方案一(JAVA代码)

(适用于微信和蓝信)

/**  
     * 上传蓝信附件
     * @param accessToken
     * @param filename
     * @return
     */
    public  JSONObject uploadMedia(String accessToken,String filename) {
             JSONObject jsonObject = null;
　　　　　　　 String UPLOAD_WECHAT_URL = "https://login.lanxin.cn/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE";
             String last_lanx_url = UPLOAD_WECHAT_URL.replace("ACCESS_TOKEN", accessToken);
                // 定义数据分割符
                String boundary = "----------sunlight";
//                
                try {
                    File file=new File(filename);
//                    URL url = new URL(last_lanx_url);
                    URL url = new URL(null,last_lanx_url,new sun.net.www.protocol.https.Handler());
                    HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
                    //发送POST请求必须设置如下两行
                    conn.setDoOutput(true);
                    conn.setDoInput(true);
                    conn.setUseCaches(false);
                    conn.setRequestMethod("POST");
                    conn.setRequestProperty("connection", "Keep-Alive");
                    conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
                    conn.setRequestProperty("Charsert", "UTF-8");
                    conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
         
                    OutputStream out = new DataOutputStream(conn.getOutputStream());
                    byte[] end_data = ("
--" + boundary + "--
").getBytes();// 定义最后数据分隔线
                    StringBuilder sb = new StringBuilder();
                    sb.append("--");
                    sb.append(boundary);
                    sb.append("
");
                    sb.append("Content-Disposition: form-data;name="media";filename="" + file.getName() + ""
");
                    sb.append("Content-Type:application/octet-stream

");
                    byte[] data = sb.toString().getBytes();
                    out.write(data);
                    DataInputStream in = new DataInputStream(new FileInputStream(file));
                    int bytes = 0;
                    byte[] bufferOut = new byte[1024 * 8];
                    while ((bytes = in.read(bufferOut)) != -1) {
                        out.write(bufferOut, 0, bytes);
                    }
                    out.write("
".getBytes()); // 多个文件时，二个文件之间加入这个
                    in.close();
                    out.write(end_data);
                    out.flush();
                    out.close();
                    // 定义BufferedReader输入流来读取URL的响应
                    BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                    String line = null;
                    StringBuffer buffer = new StringBuffer();
                    while ((line = reader.readLine()) != null) {
                        buffer.append(line);
                    }
                    System.out.println("请求蓝信上传附件接口响应报文内容为:"+buffer.toString());
                    jsonObject = JSONObject.parseObject(buffer.toString());
                } catch (Exception e) {
                    System.out.println("POST请求蓝信上传附件接口出现异常");
　　　　　　　　　　　　e.printStackTrace();
                    return null;
                }
                return jsonObject;
         }

方案二 （JAVA代码）

(适用于微信/蓝信)

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
 
import net.sf.json.JSONObject;
 
public class WXUpload {
    private static final String upload_wechat_url = "https://qyapi.weixin.qq.com/cgi-bin/media/upload?access_token=ACCESS_TOKEN&type=TYPE";
 
    public static JSONObject upload(String accessToken, String type, File file) {
        JSONObject jsonObject = null;
        String last_wechat_url = upload_wechat_url.replace("ACCESS_TOKEN", accessToken).replace("TYPE", type);
        // 定义数据分割符
        String boundary = "----------sunlight";
        try {
            URL uploadUrl = new URL(last_wechat_url);
            HttpURLConnection uploadConn = (HttpURLConnection) uploadUrl.openConnection();
            uploadConn.setDoOutput(true);
            uploadConn.setDoInput(true);
            uploadConn.setRequestMethod("POST");
            // 设置请求头Content-Type
            uploadConn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
            // 获取媒体文件上传的输出流（往微信服务器写数据）
            OutputStream outputStream = uploadConn.getOutputStream();
 
            // 从请求头中获取内容类型
            String contentType = "Content-Type: " + getContentType();
            // 请求体开始
            outputStream.write(("--" + boundary + "
").getBytes());
            outputStream.write(String.format("Content-Disposition: form-data; name="media"; filename="%s"
", file.getName()).getBytes());
            outputStream.write(String.format("Content-Type: %s

", contentType).getBytes());
 
            // 获取媒体文件的输入流（读取文件）
            DataInputStream in = new DataInputStream(new FileInputStream(file));
            byte[] buf = new byte[1024 * 8];
            int size = 0;
            while ((size = in.read(buf)) != -1) {
                // 将媒体文件写到输出流（往微信服务器写数据）
                outputStream.write(buf, 0, size);
            }
            // 请求体结束
            outputStream.write(("
--" + boundary + "--
").getBytes());
            outputStream.close();
            in.close();
 
            // 获取媒体文件上传的输入流（从微信服务器读数据）
            InputStream inputStream = uploadConn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            StringBuffer buffer = new StringBuffer();
            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            bufferedReader.close();
            inputStreamReader.close();
            // 释放资源
            inputStream.close();
            inputStream = null;
            uploadConn.disconnect();
            // 使用json解析
            jsonObject = JSONObject.fromObject(buffer.toString());
            System.out.println(jsonObject);
        } catch (Exception e) {
            System.out.println("上传文件失败！");
            e.printStackTrace();
        }
        return jsonObject;
    }
 
    // 获取文件的上传类型，图片格式为image/png,image/jpeg等。非图片为application /octet-stream
    private static String getContentType() throws Exception {
        return "application/octet-stream";
    }
 
}

参考地址 https://blog.csdn.net/omsvip/article/details/41350063