先上代码：
public void uploadToUrl(String fileId, String fileSetId, String formUrl) throws Throwable {
String urlStr = MyServiceConfig.getUrl() + UPLOAD_URL;
String fileName = FileUtils.getFileName(formUrl);
long fileSize = getFileSize(formUrl);
String uri = UriComponentsBuilder.fromUriString(urlStr).queryParam("fileId", fileId).build().encode().toString(); logger.debug("文件上传请求路径：{}", uri); // 获取文件输入流
InputStream in = getFileInputString(formUrl);
if (null != in) {
URL urlObj = new URL(uri);
HttpURLConnection con = (HttpURLConnection) urlObj.openConnection();
con.setRequestMethod("POST"); // 设置关键值,以Post方式提交表单，默认get方式
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=\"file\";filename=\"" + fileName + "\"\r\n");
if(!fileName.endsWith("mp4")){
sb.append("Content-Type:image/jpeg\r\n\r\n");
}else if(){
sb.append("Content-Type:video/mp4\r\n\r\n");
}
//未知文件类型，以流的方式上传
//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 dataIn = new DataInputStream(in);
int bytes = 0;
byte[] bufferOut = new byte[1024];
while ((bytes = dataIn.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(); // 读取返回数据
StringBuffer strBuf = new StringBuffer();
BufferedReader reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
strBuf.append(line).append("\n");
}
logger.debug("文件上传返回信息{}",strBuf.toString());
reader.close();
con.disconnect();
con = null;
} else {
throw new Throwable("获取文件流失败,文件下载地址url=" + formUrl);
} } // 获取文件大小
public InputStream getFileInputString(String formUrl) throws Throwable {
URL urlPath = new URL(formUrl);
HttpURLConnection conn = (HttpURLConnection) urlPath.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
int status = conn.getResponseCode();
if (status == 200) {
return conn.getInputStream();
}
return null;
} //获取文件大小
public long getFileSize(String formUrl) throws Throwable{
URL urlPath = new URL(formUrl);
HttpURLConnection conn = (HttpURLConnection)urlPath.openConnection();
conn.setConnectTimeout(downloadTimeout);
conn.setRequestMethod("GET");
int status = conn.getResponseCode();
if(status==200){
return conn.getContentLengthLong();
}
return 0;
}
public static String getFileName(String fileFullPath) {
fileFullPath = fileFullPath.replace(“/”, “\\”);
return fileFullPath.substring(fileFullPath.lastIndexOf(“\\”) + 1,
fileFullPath.length());
}
public static String getFileNameWithoutSuffix(String fileFullPath) {
fileFullPath = fileFullPath.replace(“/”, “\\”);
return fileFullPath.substring(fileFullPath.lastIndexOf(“\\”) + 1,
fileFullPath.lastIndexOf(“.”));
}
代码逻辑：
1、从访问文件的url中获取文件流和文件大小；
2、模拟http上传文件post请求；
1》.打开httpurlconnection连接，设置关键值：重点是设置请求方法post和设置不缓存；
2》.设置请求头，设置边界；重点是Content-Type；
3》.设置请求正文，比较复杂，参照代码；
4》.获取返回值；
二、使用httpClient4.4上传文件：
//上传实体文件
public static void upload(String url,String filePath) throws Exception{
HttpPost httpPost = new HttpPost(url);
httpPost.setHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
+ "AppleWebKit/537.36 (KHTML, like Gecko) "
+ "Chrome/62.0.3202.89 Safari/537.36");
httpPost.setHeader("Accept-Language","zh-cn,zh;q=0.5");
httpPost.setHeader("Accept-Charset","GBK,utf-8;q=0.7,*;q=0.7");
httpPost.setHeader("Connection","keep-alive"); MultipartEntityBuilder mutiEntity = MultipartEntityBuilder.create();
File file = new File(filePath);
//File file = new File("C:\\Users\\\\Desktop\\20171002中士.mp4");
//mutiEntity.addTextBody("filename","1问题.mp4");
mutiEntity.addPart("file", new FileBody(file)); CloseableHttpClient httpClient = HttpClients.createDefault();
httpPost.setEntity(mutiEntity.build());
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
String content = EntityUtils.toString(httpEntity);
System.out.println(content); }
上传文件流： 重点是mode的设置，这里卡了半天；
//上传文件流
public static void upload(String url,InputStream in) throws Exception{
HttpPost httpPost = new HttpPost(url);
httpPost.setHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; Win64; x64) "
+ "AppleWebKit/537.36 (KHTML, like Gecko) "
+ "Chrome/62.0.3202.89 Safari/537.36");
httpPost.setHeader("Accept-Language","zh-cn,zh;q=0.5");
httpPost.setHeader("Accept-Charset","GBK,utf-8;q=0.7,*;q=0.7");
httpPost.setHeader("Connection","keep-alive"); MultipartEntityBuilder mutiEntity = MultipartEntityBuilder.create();
//mutiEntity.addTextBody("filename","16有问题.mp4");
mutiEntity.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
mutiEntity.addBinaryBody("uploadFile", in, ContentType.create("multipart/form-data"), "16有问题.mp4"); CloseableHttpClient httpClient = HttpClients.createDefault();
httpPost.setEntity(mutiEntity.build());
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
String content = EntityUtils.toString(httpEntity);
System.out.println(content); }
使用RestTemplate:
public static void uploadFile(String url,File file){
RestTemplate template = new RestTemplate();
ClientHttpRequestFactory clientFactory = new HttpComponentsClientHttpRequestFactory();
template.setRequestFactory(clientFactory); URI uri = UriComponentsBuilder.fromUriString(url).build().encode().toUri(); FileSystemResource resource = new FileSystemResource(file);
MultiValueMap<String, Object> param = new LinkedMultiValueMap<>();
param.add("file", resource);
//param.add("fileName", "问题.mp4");
org.springframework.http.HttpEntity<MultiValueMap<String, Object>> httpEntity = new org.springframework.http.HttpEntity<MultiValueMap<String, Object>>(param);
ResponseEntity<String> responseEntity = template.exchange(uri, HttpMethod.POST, httpEntity, String.class);
System.out.println("文件上传成功，返回：" + responseEntity.getBody());
}
RestTemplate上传文件流：不建议用
这个比较麻烦，先看代码吧；
public static void uploadFile(String url,InputStream in){
RestTemplate template = new RestTemplate();
ClientHttpRequestFactory clientFactory = new HttpComponentsClientHttpRequestFactory();
template.setRequestFactory(clientFactory); URI uri = UriComponentsBuilder.fromUriString(url).build().encode().toUri();// InputStreamResource resource = new InputStreamResource(in); MultiValueMap<String, Object> param = new LinkedMultiValueMap<>();
param.add("file", new MultipartFileResource(in, "test"));
//param.add("fileName", "问题.mp4");
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.MULTIPART_FORM_DATA); org.springframework.http.HttpEntity<MultiValueMap<String, Object>> httpEntity =
new org.springframework.http.HttpEntity<MultiValueMap<String, Object>>(param,headers); List<HttpMessageConverter<?>> messageConverters = template.getMessageConverters();
for (int i = 0; i < messageConverters.size(); i++) {
HttpMessageConverter<?> messageConverter = messageConverters.get(i);
if ( messageConverter.getClass().equals(ResourceHttpMessageConverter.class) )
messageConverters.set(i, new ResourceHttpMessageConverterHandlingInputStreams());
} ResponseEntity<String> responseEntity = template.exchange(uri, HttpMethod.POST, httpEntity, String.class); System.out.println("文件上传成功，返回：" + responseEntity.getBody());
}
这是修改后的，添加了转换器，因为添加之前会报错，文件流读了两次，其中一次是读取文件大小contentLength;
package com.my.upload;import java.io.IOException;
import java.io.InputStream;import org.springframework.core.io.InputStreamResource;public class MultipartFileResource extends InputStreamResource { private final String filename; public MultipartFileResource(InputStream inputStream, String filename) {
super(inputStream);
this.filename = filename;
}
@Override
public String getFilename() {
return this.filename;
} @Override
public long contentLength() throws IOException {
return -1; // we do not want to generally read the whole stream into memory ...
}
}package com.my.upload;import java.io.IOException;import org.springframework.core.io.Resource;
import org.springframework.http.MediaType;
import org.springframework.http.converter.ResourceHttpMessageConverter;public class ResourceHttpMessageConverterHandlingInputStreams extends ResourceHttpMessageConverter { @Override
protected Long getContentLength(Resource resource, MediaType contentType) throws IOException {
Long contentLength = super.getContentLength(resource, contentType); return contentLength == null || contentLength < 0 ? null : contentLength;
}
}
以上！
