No projeto, as imagens precisam ser transmitidas a terceiros. A interface da outra parte requer a transmissão de fluxos de arquivos em vez da codificação base64 comumente usada.
import com.alibaba.fastjson.JSONObject;
import com.leyue100.common.util.StringUtils;
import lombok.extern.slf4j.Slf4j;
import javax.activation.MimetypesFileTypeMap;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
@Slf4j
public class FileUploadUtil {
public static void main(String[] args) {
try {
Map<String, String> filePathMap = new HashMap<>();
String url = "";
filePathMap.put("2345678", "/上传.jpg");
String result = fileUpload(url, "id","2345",filePathMap");
log.info("影像上传接口返回参数" + JSONObject.toJSONString(result));
} catch (Exception e) {
log.error("财信上传文件系统异常！fileUpload", e);
throw e;
}
}
/**
* 影像上传接口
*
* @param relaid
*/
public static String fileUpload(String url, String seqId, String imgList, Map<String, String> fileMap) {
try {
Map<String, Object> textMap = new HashMap<String, Object>();
//可以设置多个input的name，value
textMap.put("seqId", seqId);
textMap.put("imglist", imgList);
log.info("上传接口请求参数" + textMap.toString());
String result = formUpload(url, textMap, fileMap, ".jpg");
log.info("上传接口返回参数" + JSONObject.toJSONString(result));
return result;
} catch (Exception e) {
log.error("上传文件系统异常！fileUpload", e);
throw e;
}
}
/**
* 功能描述：删除已经上传的文件
*
* @author songchengye
* @date 2022/4/8 下午6:18
*/
public static void removeFile(Map<String, String> fileMap) {
if (fileMap != null) {
Iterator iter = fileMap.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
String inputValue = (String) entry.getValue();
if (inputValue == null) {
continue;
}
File file = new File(inputValue);
file.delete();
}
}
}
@SuppressWarnings("rawtypes")
public static String formUpload(String urlStr, Map<String, Object> textMap,
Map<String, String> fileMap, String contentType) {
String res = "";
HttpURLConnection conn = null;
// boundary就是request头和上传文件内容的分隔符
String BOUNDARY = "---------------------------123821742118716";
try {
URL url = new URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
conn.setReadTimeout(30000);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("requestId", StringUtils.getLyRandomUUID());
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
OutputStream out = new DataOutputStream(conn.getOutputStream());
// text
if (textMap != null) {
StringBuffer strBuf = new StringBuffer();
Iterator iter = textMap.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
String inputName = (String) entry.getKey();
String inputValue = (String) entry.getValue();
if (inputValue == null) {
continue;
}
strBuf.append("\r\n").append("--").append(BOUNDARY).append("\r\n");
strBuf.append("Content-Disposition: form-data; name=\"" + inputName + "\"\r\n\r\n");
strBuf.append(inputValue);
}
out.write(strBuf.toString().getBytes());
}
// file
if (fileMap != null) {
Iterator iter = fileMap.entrySet().iterator();
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
String inputName = (String) entry.getKey();
String inputValue = (String) entry.getValue();
if (inputValue == null) {
continue;
}
File file = new File(inputValue);
String filename = file.getName();
//没有传入文件类型，同时根据文件获取不到类型，默认采用application/octet-stream
contentType = new MimetypesFileTypeMap().getContentType(file);
//contentType非空采用filename匹配默认的图片类型
if (!"".equals(contentType)) {
if (filename.endsWith(".png")) {
contentType = "image/png";
} else if (filename.endsWith(".jpg") || filename.endsWith(".jpeg") || filename.endsWith(".jpe")) {
contentType = "image/jpeg";
} else if (filename.endsWith(".gif")) {
contentType = "image/gif";
} else if (filename.endsWith(".ico")) {
contentType = "image/image/x-icon";
}
}
if (contentType == null || "".equals(contentType)) {
contentType = "application/octet-stream";
}
StringBuffer strBuf = new StringBuffer();
strBuf.append("\r\n").append("--").append(BOUNDARY).append("\r\n");
strBuf.append("Content-Disposition: form-data; name=\"" + inputName + "\"; filename=\"" + filename + "\"\r\n");
// strBuf.append("Content-Disposition: form-data; name=\"" + inputName + "\"; filename=\"" + filename + "\"\r\n");
strBuf.append("Content-Type:" + contentType + "\r\n\r\n");
out.write(strBuf.toString().getBytes());
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();
}
}
byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();
out.write(endData);
out.flush();
out.close();
// 读取返回数据
StringBuffer strBuf = new StringBuffer();
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
strBuf.append(line).append("\n");
}
res = strBuf.toString();
reader.close();
reader = null;
} catch (Exception e) {
System.out.println("发送POST请求出错。" + urlStr);
e.printStackTrace();
} finally {
if (conn != null) {
conn.disconnect();
conn = null;
}
}
return res;
}
}
Link original: https://blog.csdn.net/weixin_43945983/article/details/124126652