Java POST multipart/form-data 包含 json 和 bz2 压缩文件部分

Question

所以我遇到了一个问题，我需要通过 java 应用程序发布 bzip2 文件。我在做多部分帖子或使用常规文件时没有问题（请参阅位于http://zewaren.net/site/?q=node/123 的第三个示例）

但是，上面的示例假设您将文件内容作为字符串发送，而我只是发送压缩内容（字节数组）。

    public void postSegments(HttpsURLConnection connection, File segment) throws UnsupportedEncodingException, IOException {
    PrintWriter OutputStream = null;
    try {
        OutputStream = new PrintWriter(new OutputStreamWriter(connection.getOutputStream(), "UTF-8"), true);

        OutputStream.append(BOUNDARY_SPLIT).append(BOUNDARY).append("\r\n");
        OutputStream.append("Content-Disposition: form-data; name=\"").append("metadata").append("\"").append("\r\n");
        OutputStream.append("Content-Type: ").append("application/json; charset=UTF-8").append("\r\n").append("\r\n");
        OutputStream.append(META_JSON).append("\r\n");

        OutputStream.append(BOUNDARY_SPLIT).append(BOUNDARY).append("\r\n");
        OutputStream.append("Content-Disposition: form-data; name=\"data\"; filename=\"NAME\"").append("\r\n");
        OutputStream.append("Content-Type: ").append("application/octet-stream; charset=UTF-8").append("\r\n").append("\r\n");
        OutputStream.append(fileService.readFile(segment));
        OutputStream.append(BOUNDARY_SPLIT).append(BOUNDARY).append(BOUNDARY_SPLIT).append("\r\n");
    }
    finally {
        if (OutputStream != null) {
          OutputStream.close();
        }
    }

在上面的代码中，我在尝试使用通用文件扫描器读取分段文件时遇到错误（由于分段是 bzip2 文件，所以它不起作用）

我一直在寻找一个好的包装库来轻松处理发送这些处理大型/压缩文件的多部分请求，但我还没有成功。

提前谢谢大家。

Answer 1

所以我没有成功使用 httpsUrlConnection 发布文件。我找不到原因，我认为这是我声明的标题有问题。

不过，我确实设法使用 Jersey 以及 apache 组件编写了一些基本的处理程序。

jersey 客户端在 Oauth 中有自己的构建，而 apache 客户端使用 oauth-signpost 插件。

注意：这些示例可以发布由文件和 json 组成的 multipart/form-data。其他输入将相当容易实现。它还使用 Oauth，而不是 Oauth2，它需要不同的库并且处理方式大不相同（即令牌刷新）

下面是 Jersey 的实现。我不建议在大文件上使用它，因为您会将整个文件存储在内存中...您可以将其分成块并发送，但我没有这样做，因为我发现 apache 版本更适合我的需要。无论如何，这是代码：

import java.io.ByteArrayInputStream;
import java.io.File;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.ext.Providers;

import org.apache.log4j.Logger;

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
import com.sun.jersey.core.header.FormDataContentDisposition;
import com.sun.jersey.multipart.FormDataBodyPart;
import com.sun.jersey.multipart.FormDataMultiPart;
import com.sun.jersey.multipart.impl.MultiPartWriter;
import com.sun.jersey.oauth.client.OAuthClientFilter;
import com.sun.jersey.oauth.signature.OAuthParameters;
import com.sun.jersey.oauth.signature.OAuthSecrets;

public class OauthRequestJersey {

private static final Logger log = Logger.getLogger(OauthRequestJersey.class);

private Client client = null;

private FileServiceUtil fileService = new FileServiceUtil();

private FormDataMultiPart multiPart;

private WebResource resource;

/*
 * Oauth Request Wrapper constructor
 */
public OauthRequestJersey(String url, String oAuthConsumerKey, String oAuthConsumerSecret){
    init();
    Providers providers = this.client.getProviders();
    OAuthSecrets secrets = new OAuthSecrets().consumerSecret(oAuthConsumerSecret);
    OAuthParameters params = new OAuthParameters().consumerKey(oAuthConsumerKey).signatureMethod("HMAC-SHA1");
    OAuthClientFilter filter = new OAuthClientFilter(providers,params,secrets);

    resource = client.resource(url);
    resource.addFilter(filter);
}

private void init(){
    ClientConfig config = new DefaultClientConfig();
    config.getClasses().add(MultiPartWriter.class);
    multiPart = new FormDataMultiPart();
    client = com.sun.jersey.api.client.Client.create(config);       
}

public void addJsonPart(String name, String json){
    multiPart.field(name, json, MediaType.APPLICATION_JSON_TYPE);
}

public void addFilePart(String name, File file){
    byte[] data = fileService.fileToByteArray(file);
    FormDataBodyPart fdbp = new FormDataBodyPart(
            FormDataContentDisposition.name(name)
                    .fileName(file.getName()).build(),
                     new ByteArrayInputStream(data),
                     MediaType.APPLICATION_OCTET_STREAM_TYPE);

    multiPart.bodyPart(fdbp);
}

public ClientResponse finish(){
    ClientResponse response = null;
    response =  resource.type(MediaType.MULTIPART_FORM_DATA)
            .post(ClientResponse.class,multiPart);
    log.debug("Response for the call " + response);
    log.debug("Response for the call status " + response.getStatus());
    return response;
}

}

球衣的Maven：

    <dependency>
    <groupId>com.sun.jersey.contribs</groupId>
    <artifactId>jersey-multipart</artifactId>
    <version>1.18.1</version>
</dependency>
<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-client</artifactId>
    <version>1.18.1</version>
</dependency>
<dependency>
    <groupId>com.sun.jersey.oauth</groupId>
    <artifactId>oauth-signature</artifactId>
    <version>1.1.1-ea</version>
</dependency>
<dependency>
    <groupId>com.sun.jersey.oauth</groupId>
    <artifactId>oauth-client</artifactId>
    <version>1.1.1-ea</version>
</dependency>

下面是我的 apache 实现。这是我的首选方法，因为它自己处理文件流并抽象标题，而不必自己手动制作它们！您会注意到我还添加了一些逻辑来处理获取请求。

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import oauth.signpost.OAuthConsumer;
import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;
import oauth.signpost.exception.OAuthCommunicationException;
import oauth.signpost.exception.OAuthExpectationFailedException;
import oauth.signpost.exception.OAuthMessageSignerException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

import org.apache.log4j.Logger;

public class OauthRequestApache {
private static final Logger log = Logger.getLogger(OauthRequestApache.class);

private static CloseableHttpClient client;

private static boolean isPost;

private static HttpPost postRequest;

private static HttpGet getRequest;

private static MultipartEntityBuilder builder;

public OauthRequestApache(String requestURL, String consumerKey, String consumerSecret, boolean post) throws IOException, OAuthMessageSignerException, OAuthExpectationFailedException, OAuthCommunicationException{
    isPost = post;
    OAuthConsumer consumer = new CommonsHttpOAuthConsumer(consumerKey,consumerSecret);

    if(isPost){
        postRequest = new HttpPost(requestURL);
        builder = MultipartEntityBuilder.create();
        consumer.sign(postRequest);
    }else{
        getRequest = new HttpGet(requestURL);
        consumer.sign(getRequest);
    }
    client = HttpClients.createDefault();
}

public void addJsonPart(String name, String value){
    builder.addTextBody(name, value, ContentType.APPLICATION_JSON);
}

public void addFilePart(String name, File file){
    builder.addBinaryBody(name, file);
}

public List<String> finish() throws ClientProtocolException, IOException{
    HttpResponse response;
    List<String> status = new ArrayList<String>();
    ResponseHandler<String> handler = new BasicResponseHandler();
    if(isPost){
        HttpEntity multipart = builder.build();
        postRequest.setEntity(multipart);
         response = client.execute(postRequest);
    }else{
        response = client.execute(getRequest);
    }
    String body = handler.handleResponse(response);
    status.add(Integer.toString(response.getStatusLine().getStatusCode()));
    status.add(body);
    client.close(); 
    return status;
}
}

Apache 的 Maven

    <dependency>
    <groupId>oauth.signpost</groupId>
    <artifactId>signpost-core</artifactId>
</dependency>
<dependency>
    <groupId>oauth.signpost</groupId>
    <artifactId>signpost-commonshttp4</artifactId>
    <version>1.2.1.1</version>
</dependency>

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-compress</artifactId>
    <version>1.9</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpcore</artifactId>
    <version>4.4</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.3</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
    <version>4.3.6</version>
</dependency>