利用resteasy框架构建rest webservice----第六波：实现文件下载

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客户端代码:

package resteasy.server;

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.GET;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Component;
@Path(value = "echo")
public class Echo {
@GET
@Path(value = "/{message}")
public String echoService(@PathParam("message") String message)
{
      return message;
}

   @PUT
   @Path(value = "/{folder}/{fileName}")
   public Response uploadFile(@PathParam("folder") String folder,@PathParam("fileName") String fileName,
           @Context HttpServletRequest request)
   {
       File f = new File("c:\\"+fileName);
       InputStream is = null;
       try {
           is = request.getInputStream();
           OutputStream os = new FileOutputStream(f);
           byte[] buffer = new byte[8192];
           int bytesRead = 0;
           while ((bytesRead = is.read(buffer, 0, 8192)) != -1) {
               os.write(buffer, 0, bytesRead);
           }
           //FileUtils.copyInputStreamToFile(is, f);
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
       return Response.ok().build();
   }

   /**
   * 下载对象
   * @param bucketName
   * @param objectName
   * @param request
   * @return
   * @throws FileNotFoundException
   */
   @Path(value = "/{bucketName}/{objectName}")
   @GET
   @Produces(MediaType.APPLICATION_OCTET_STREAM)
   public Response downloadObject(@PathParam(value = "bucketName") String bucketName,@PathParam(value = "objectName") String objectName,@Context HttpServletRequest request) throws FileNotFoundException
   {
   //   BucketObject bucketObject = objectManager.downloadObject(request.getHeader(CommonConstant.USER_TOKEN),CommonsUtil.generateSummary(request), bucketName, objectName);
       String fielname="C:\\"+bucketName+"\\"+objectName;
       //直接返回输出流
       File localFile = new File(fielname);
       FileInputStream fileInputStream = new FileInputStream(localFile);
       //return Response.ok(new BigFileOutputStream(bucketObject.getDataStream())).build();
       return Response.ok(new BigFileOutputStream(fileInputStream)).build();
   }
}

服务器端代码:

    @Path(value = "/{bucketName}/{objectName}")
   @GET
   @Produces(MediaType.APPLICATION_OCTET_STREAM)
   public Response downloadObject(@PathParam(value = "bucketName") String bucketName,@PathParam(value = "objectName") String objectName,@Context HttpServletRequest request) throws FileNotFoundException
   {
   //   BucketObject bucketObject = objectManager.downloadObject(request.getHeader(CommonConstant.USER_TOKEN),CommonsUtil.generateSummary(request), bucketName, objectName);
       String fielname="C:\\"+bucketName+"\\"+objectName;
       //直接返回输出流
       File localFile = new File(fielname);
       FileInputStream fileInputStream = new FileInputStream(localFile);
       //return Response.ok(new BigFileOutputStream(bucketObject.getDataStream())).build();
       return Response.ok(new BigFileOutputStream(fileInputStream)).build();
   }

小结：服务器端负责构建文件的输入流，客户端负责构建到新文件的输出流

参考:http://blog.csdn.net/caizhh2009/article/details/7221206

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