关于Netty发送http请求实现文件上传

在发送http请求的时候关键在于request的封装

1、首先要先将上传的文件封装到HttpPostRequestEncoder中

HttpRequest request1 = new DefaultFullHttpRequest(
        HttpVersion.HTTP_1_1, HttpMethod.POST, url);

HttpDataFactory factory = new DefaultHttpDataFactory(DefaultHttpDataFactory.MINSIZE);
// This encoder will help to encode Request for a FORM as POST.
HttpPostRequestEncoder bodyRequestEncoder = new HttpPostRequestEncoder(factory, request1, false);	bodyRequestEncoder.addBodyFileUpload("file", file, "application/x-zip-compressed", false);

2、然后获取该封装的request中的List

List bodylist = bodyRequestEncoder.getBodyListAttributes();

3、最后再重新创建一个HttpRequest,将上面封装获取到的List 放入，然后通过channel直接发送该request就行了，该注意的是第二次创建的HttpPostRequestEncoder的第三个参数是true

HttpRequest request = new DefaultHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.POST, url);
request.headers().set(HttpHeaderNames.CONNECTION,HttpHeaderValues.CLOSE);
HttpPostRequestEncoder bodyRequestEncoder2 = new HttpPostRequestEncoder(factory, request, true);

bodyRequestEncoder2.setBodyHttpDatas(bodylist);
bodyRequestEncoder2.finalizeRequest();