java - 将 JSONObject 中的文件发送到 REST WebService

Question

我想向 web 服务发送一个文件，但我需要发送更多信息，所以我想用 json 发送它们。但是当我在我的 jsonObject 中放入一个文件时，我得到一个错误，说它不是一个字符串。我的问题是，我是否应该将我的文件转换为字符串，然后放入我的 json 并在网络服务上将其转换为文件？还是有其他简单的方法？

这是我的代码:

客户:

private void send() throws JSONException{
    ClientConfig config = new DefaultClientConfig();
    Client client = Client.create(config);
    client.addFilter(new LoggingFilter());
    WebResource service = client.resource("http://localhost:8080/proj/rest/file/upload_json");

    JSONObject my_data = new JSONObject();
    File file_upload = new File("C:/hi.txt");
    my_data.put("User", "Beth");
    my_data.put("Date", "22-07-2013");
    my_data.put("File", file_upload);

    ClientResponse client_response = service.accept(MediaType.APPLICATION_JSON).post(ClientResponse.class, my_data);

    System.out.println("Status: "+client_response.getStatus());

    client.destroy();
}

网络服务

@POST
@Path("/upload_json")

@Consumes(MediaType.APPLICATION_JSON)
@Produces("text/plain")

public String receive(JSONObject json) throws JSONException {

    //Here I'll save my file and make antoher things..
    return "ok";
}

得到所有答案后，这是我的代码 - 谢谢大家:

网络服务

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;
import com.sun.jersey.core.util.Base64;

@Path("/file")
public class ReceiveJSONWebService {

    @POST
    @Path("/upload_json")

    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)

    public JSONObject receiveJSON(JSONObject json) throws JSONException, IOException {
        convertFile(json.getString("file"), json.getString("file_name"));
        //Prints my json object
        return json;
    }

    //Convert a Base64 string and create a file
    private void convertFile(String file_string, String file_name) throws IOException{
        byte[] bytes = Base64.decode(file_string);
        File file = new File("local_path/"+file_name);
        FileOutputStream fop = new FileOutputStream(file);
        fop.write(bytes);
        fop.flush();
        fop.close();
    }
}

客户

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import javax.ws.rs.core.MediaType;
import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;
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.api.client.filter.LoggingFilter;
import com.sun.jersey.core.util.Base64;
import com.sun.jersey.multipart.FormDataMultiPart;
import com.sun.jersey.multipart.file.FileDataBodyPart;
import com.sun.jersey.multipart.impl.MultiPartWriter;

public class MyClient {


    public static void main(String[] args) throws JSONException, IOException 
    {
        MyClient my_client = new MyClient();
        File file_upload = new File("local_file/file_name.pdf");
        my_client.sendFileJSON(file_upload);
    }


    private void sendFileJSON(File file_upload) throws JSONException, IOException{

        ClientConfig config = new DefaultClientConfig();
        Client client = Client.create(config);
        client.addFilter(new LoggingFilter());
        WebResource service = client.resource("my_rest_address_path");
        JSONObject data_file = new JSONObject();
        data_file.put("file_name", file_upload.getName());
        data_file.put("description", "Something about my file....");
        data_file.put("file", convertFileToString(file_upload));

        ClientResponse client_response = service.accept(MediaType.APPLICATION_JSON).post(ClientResponse.class, data_file);

        System.out.println("Status: "+client_response.getStatus());

        client.destroy();

    }


    //Convert my file to a Base64 String
    private String convertFileToString(File file) throws IOException{
        byte[] bytes = Files.readAllBytes(file.toPath());   
        return new String(Base64.encode(bytes));
    }

}

Answer 1

您应该将文件数据转换为 Base64 编码，然后将其传输，例如像这样:

byte[] bytes = Files.readAllBytes(file_upload.toPath());
dados.put("File", DatatypeConverter.printBase64Binary(bytes));