使用OkHTTP来调用restful接口上传文件

首先想要了解okhttp相关功能，请查看文章：http://blog.csdn.net/win7system/article/details/51697884，

闲话就不多说了，直接来干货

okhttp接口

import java.io.File;
import java.io.IOException;

import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.MultipartBuilder;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

public class PostMultipart {

private static final String IMGUR_CLIENT_ID = "9199fdef135c122";
private static final MediaType MEDIA_TYPE_DATA = MediaType.parse("multipart/form-data");

private final OkHttpClient client = new OkHttpClient();

public void run(String url, String filePath) throws Exception {

File file = new File(filePath);

RequestBody requestBody = new MultipartBuilder()
.type(MultipartBuilder.FORM)
.addFormDataPart("filename", file.getName())
.addFormDataPart("file", file.getName(),
RequestBody.create(MEDIA_TYPE_DATA, file))
.build();

Request request = new Request.Builder()
.header("Authorization", "Client-ID " + IMGUR_CLIENT_ID)
.url(url)
.post(requestBody)
.build();

Response response = client.newCall(request).execute();
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

System.out.println(response.body().string());
}

}

restful接口

@POST
@Path("/upload")
@Consumes(MediaType.MULTIPART_FORM_DATA)
@Produces(MediaType.APPLICATION_JSON)
public Response uploadFile(@FormDataParam("file") InputStream uploadedInputStream,
@FormDataParam("file") FormDataContentDisposition fileDetail, @FormDataParam("filename") String filename)
throws IOException {
System.out.println("文件创建时间：" + fileDetail.getFileName());
System.out.println("文件名字：" + filename);

File file = new File("D:\\demo\\"+fileDetail.getFileName());
if (!file.exists())
file.createNewFile();
FileOutputStream out = new FileOutputStream(file);
int c;
byte buffer[] = new byte[1024];
while ((c = uploadedInputStream.read(buffer)) != -1) {
for (int i = 0; i < c; i++)
out.write(buffer[i]);
}
Map<String, Object> map = new HashMap<String, Object>();
map.put("文件读取日期", fileDetail.getReadDate());
map.put("文件大小", fileDetail.getSize());
map.put("文件类型", fileDetail.getType());
map.put("文件读取", uploadedInputStream.read());
uploadedInputStream.close();
out.close();
return Response.status(200).entity(map).build();
}

另外需要在web.xml下添加一个初始化参数才能起作用

<init-param>
<param-name>jersey.config.server.provider.classnames</param-name>
<param-value>org.glassfish.jersey.filter.LoggingFilter;org.glassfish.jersey.media.multipart.MultiPartFeature</param-value>
</init-param>

org.glassfish.jersey.filter.LoggingFilter是可以打印出jersey上传文件时候的日志，可以选择也可以不用选择

如果是maven项目还需要导入如下包

<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-multipart</artifactId>
<version>2.22.2</version>
</dependency>