如何使用Jersey客户端上传大文件时避免OutOfMemoryError

问题描述

我正在使用Jersey客户端进行基于http的请求。如果文件很小，运行的很好，但是当我发布一个大小为700M的文件时会出错：

 主要是java.lang.OutOfMemoryError：Java堆空间$ b $在java.util.Arrays.copyOf（Arrays.java:2786）
在java.io.ByteArrayOutputStream.write（ByteArrayOutputStream.java:94）
 at sun.net.www.http.PosterOutputStream.write（PosterOutputStream.java:61）
 at com.sun.jersey.api.client.CommittingOutputStream.write（CommittingOutputStream.java:90）
在com.sun.jersey.core.util.ReaderWriter.writeTo（ReaderWriter.java:115）
在com.sun.jersey.core.provider.AbstractMessageReaderWriterProvider.writeTo（AbstractMessageReaderWriterProvider.java:76）
在com.sun.jersey.core.impl.provider.entity.FileProvider.writeTo（FileProvider.java:103）
在com.sun.jersey.core.impl.provider.entity.FileProvider.writeTo（FileProvider .java：64）
 at com.sun.jersey.multipart.impl.MultiPartWriter.writeTo（MultiPartWriter.java:224） 
 at com.sun.jersey.multipart.impl.MultiPartWriter.writeTo（MultiPartWriter.java:71）
 at com.sun.jersey.api.client.RequestWriter.writeRequestEntity（RequestWriter.java:300） 
 at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke（URLConnectionClientHandler.java:204）
 at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle（URLConnectionClientHandler.java:147） 
 at com.sun.jersey.api.client.Client.handle（Client.java:648）
 at com.sun.jersey.api.client.WebResource.handle（WebResource.java:680） 
 at com.sun.jersey.api.client.WebResource.access $ 200（WebResource.java:74）
 at com.sun.jersey.api.client.WebResource $ Builder.post（WebResource.java ：568）
（TestHttpRequest.java:42）
  
 
 
  ClientConfig cc = new DefaultClientConfig（）; 
客户端客户端= Client.create（cc）; 
 WebResource资源= client.resource（http：// localhost：8080 / JerseyWithServletTest / helloworld）; 
 FormDataMultiPart form = new FormDataMultiPart（）; 
档案档案=新档案（E：/ CN_WXPPSP3_v312.ISO）; 
 form.field（username，ljy）; 
 form.field（password，password）; 
 form.field（filename，file.getName（））; 
 form.bodyPart（new FileDataBodyPart（file，file，MediaType.MULTIPART_FORM_DATA_TYPE））; 
 ClientResponse response = resource.type（MediaType.MULTIPART_FORM_DATA）.post（ClientResponse.class，form）; 
  
 
 
解决方案
您可以使用streams.Try这样的客户端：
  InputStream fileInStream = new FileInputStream（fileName）; 
 String sContentDisposition =attachment; filename = \+ fileName.getName（）+\; 
 WebResource fileResource = a_client.resource（a_sUrl）; 
 ClientResponse response = fileResource.type（MediaType.APPLICATION_OCTET_STREAM）
 .header（Content-Disposition，sContentDisposition）
 .post（ClientResponse.class，fileInStream）; 
  
这样的资源在服务器上：
  @PUT 
 @Consumes（application / octet-stream）
 public Response putFile（@Context HttpServletRequest a_request，
 @PathParam（fileId ）long a_fileId，
 InputStream a_fileInputStream）throws Throwable 
 {
 //用a_fileInputStream执行某些操作
 // etc 
  
 
I am using Jersey client for http-based request. It works well if the file is small but run into error when I post a file with size of 700M:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:2786)
    at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:94)
    at sun.net.www.http.PosterOutputStream.write(PosterOutputStream.java:61)
    at com.sun.jersey.api.client.CommittingOutputStream.write(CommittingOutputStream.java:90)
    at com.sun.jersey.core.util.ReaderWriter.writeTo(ReaderWriter.java:115)
    at com.sun.jersey.core.provider.AbstractMessageReaderWriterProvider.writeTo(AbstractMessageReaderWriterProvider.java:76)
    at com.sun.jersey.core.impl.provider.entity.FileProvider.writeTo(FileProvider.java:103)
    at com.sun.jersey.core.impl.provider.entity.FileProvider.writeTo(FileProvider.java:64)
    at com.sun.jersey.multipart.impl.MultiPartWriter.writeTo(MultiPartWriter.java:224)
    at com.sun.jersey.multipart.impl.MultiPartWriter.writeTo(MultiPartWriter.java:71)
    at com.sun.jersey.api.client.RequestWriter.writeRequestEntity(RequestWriter.java:300)
    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:204)
    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:147)
    at com.sun.jersey.api.client.Client.handle(Client.java:648)
    at com.sun.jersey.api.client.WebResource.handle(WebResource.java:680)
    at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)
    at com.sun.jersey.api.client.WebResource$Builder.post(WebResource.java:568)
    at TestHttpRequest.main(TestHttpRequest.java:42)
here is my code:
ClientConfig cc = new DefaultClientConfig();
        Client client = Client.create(cc);
        WebResource resource = client.resource("http://localhost:8080/JerseyWithServletTest/helloworld");
        FormDataMultiPart form = new FormDataMultiPart();
        File file = new File("E:/CN_WXPPSP3_v312.ISO");
        form.field("username", "ljy");
        form.field("password", "password");
        form.field("filename", file.getName());
        form.bodyPart(new FileDataBodyPart("file", file, MediaType.MULTIPART_FORM_DATA_TYPE));
        ClientResponse response = resource.type(MediaType.MULTIPART_FORM_DATA).post(ClientResponse.class, form);
 解决方案 
You could use streams.Try something like this on the client:
InputStream fileInStream = new FileInputStream(fileName);
String sContentDisposition = "attachment; filename=\"" + fileName.getName()+"\"";
WebResource fileResource = a_client.resource(a_sUrl);
ClientResponse response = fileResource.type(MediaType.APPLICATION_OCTET_STREAM)
                        .header("Content-Disposition", sContentDisposition)
                        .post(ClientResponse.class, fileInStream);
with resource like this on the server:
@PUT
@Consumes("application/octet-stream")
public Response putFile(@Context HttpServletRequest a_request,
                         @PathParam("fileId") long a_fileId,
                         InputStream a_fileInputStream) throws Throwable
{
    // Do something with a_fileInputStream
    // etc
                        
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