请用Java实现一个用netty发送http请求的功能,其响应是multipart格式,对响应解析
时间: 2024-03-26 07:41:01 浏览: 17
好的,以下是一个基于Netty的示例代码,可以用于发送HTTP请求并解析响应中的Multipart内容:
```java
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.*;
import io.netty.handler.codec.http.multipart.HttpDataFactory;
import io.netty.handler.codec.http.multipart.HttpPostRequestEncoder;
import io.netty.handler.codec.http.multipart.MemoryFileUpload;
import io.netty.handler.codec.http.multipart.MemoryAttribute;
import io.netty.util.CharsetUtil;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import java.util.Map;
public class NettyHttpClient {
private final String host;
private final int port;
public NettyHttpClient(String host, int port) {
this.host = host;
this.port = port;
}
public void sendHttpRequest() throws URISyntaxException, InterruptedException, UnsupportedEncodingException {
URI uri = new URI("/upload");
String requestBody = "test request body";
String boundary = "----Boundary";
ByteBuf content = Unpooled.copiedBuffer(requestBody, CharsetUtil.UTF_8);
FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.POST, uri.toASCIIString(), content);
HttpUtil.setKeepAlive(request, true);
HttpUtil.setContentLength(request, requestBody.length());
request.headers().set(HttpHeaderNames.CONTENT_TYPE, HttpHeaderValues.MULTIPART_FORM_DATA + "; boundary=" + boundary);
HttpDataFactory factory = new DefaultHttpDataFactory(false); // Use DefaultHttpDataFactory to write data to disk
HttpPostRequestEncoder encoder = new HttpPostRequestEncoder(factory, request, false);
encoder.setBodyHttpDatas(List.of(
new MemoryAttribute("key1", "value1"),
new MemoryAttribute("key2", "value2"),
new MemoryFileUpload("file", "filename.txt", "text/plain", null, CharsetUtil.UTF_8, requestBody.getBytes())
));
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap bootstrap = new Bootstrap();
bootstrap.group(group)
.channel(NioSocketChannel.class)
.handler(new ChannelInboundHandlerAdapter() {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
if (msg instanceof FullHttpResponse) {
FullHttpResponse response = (FullHttpResponse) msg;
try {
String contentType = response.headers().get(HttpHeaderNames.CONTENT_TYPE);
if (contentType != null && contentType.startsWith(HttpHeaderValues.MULTIPART_FORM_DATA.toString())) {
HttpPostMultipartResponseDecoder decoder = new HttpPostMultipartResponseDecoder(factory, boundary);
decoder.offer(response.content());
List<InterfaceHttpData> parts = decoder.getBodyHttpDatas();
for (InterfaceHttpData part : parts) {
if (part instanceof FileUpload) {
FileUpload fileUpload = (FileUpload) part;
if (fileUpload.isCompleted()) {
System.out.println("Received file: " + fileUpload.getFilename());
System.out.println("Content: " + fileUpload.getString(CharsetUtil.UTF_8));
}
}
}
} else {
System.out.println("Received response content: " + response.content().toString(CharsetUtil.UTF_8));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
response.release();
}
} else {
System.err.println("Unknown message type: " + msg.getClass().getName());
}
}
});
ChannelFuture future = bootstrap.connect(host, port).sync();
ChannelHandlerContext ctx = future.channel().pipeline().context(ChannelInboundHandlerAdapter.class);
HttpContent contentChunk = encoder.readChunk(ctx);
while (contentChunk != null) {
future.channel().write(contentChunk);
contentChunk = encoder.readChunk(ctx);
}
future.channel().flush();
future.channel().closeFuture().sync();
} finally {
group.shutdownGracefully();
}
}
}
```
这个示例代码中,我们首先创建了一个`FullHttpRequest`对象,并根据需要设置了请求头和请求体。然后,我们使用`HttpPostRequestEncoder`将请求体中的数据编码成multipart格式,并将它们添加到请求中。注意,这里我们使用了`MemoryFileUpload`和`MemoryAttribute`,它们将数据存储在内存中而不是磁盘上。
接着,我们创建了一个`Bootstrap`对象,并设置了它的`Handler`。在`Handler`中,我们对服务器返回的响应进行了解析。如果响应的`Content-Type`是multipart格式,我们使用`HttpPostMultipartResponseDecoder`对响应中的数据进行解码,并逐个处理每个part。如果part是一个上传的文件,我们输出它的文件名和内容。否则,我们输出它的文本内容。
最后,我们将编码后的请求发送到服务器,并等待响应。当响应接收完毕后,我们关闭连接并退出程序。