使用Apache Commons File Upload解析多部分/表单数据 [英] Parsing multipart/form-data using Apache Commons File Upload

问题描述

Apache Commons File Upload软件包是否提供通用接口通过InputStream，附加Array<Byte>或任何其他通用流接口来流解析multipart/form-data块?

Does Apache Commons File Upload package provides a generic interface to stream parse multipart/form-data chunks via InputStream, appending Array<Byte>, or via any other generic streaming interface?

我知道他们有一个流API，但是该示例仅向您展示了如何通过ServletFileUpload做到这一点，我认为这必须特定于Servlet.

I know they have a streaming API but the example only shows you how to do that via ServletFileUpload, which I reckon must be specific to Servlet.

如果没有，那么JVM中是否有其他替代框架可以让您完全做到这一点?可悲的是，我正在使用的框架Spray.io似乎没有提供实现此目的的方法.

If not, are there any other alternative frameworks in JVM that lets you do exactly this? Sadly, the framework that I am using, Spray.io, doesn't seem to provide a way to do this.

推荐答案

bayou.io 具有通用的 MultipartParser

您可能需要一些适配器才能使用它，因为它有自己的适配器 异步 和 ByteSource 接口.

You might need some adapters to work with it, since it has its own Async and ByteSource interfaces.

以下示例显示如何与InputStream

    String msg = ""
        //+ "preamble\r\n"
        +"--boundary\r\n"
        +"Head1: Value1\r\n"
        +"Head2: Value2\r\n"
        +"\r\n"
        +"body.body.body.body."

        +"\r\n--boundary\r\n"
        +"Head1: Value1\r\n"
        +"Head2: Value2\r\n"
        +"\r\n"
        +"body.body.body.body."

        +"\r\n--boundary--"
        + "epilogue";

    InputStream is = new ByteArrayInputStream(msg.getBytes("ISO-8859-1"));
    ByteSource byteSource = new InputStream2ByteSource(is, 1024);
    MultipartParser parser = new MultipartParser(byteSource, "boundary");
    while(true)
    {
        try
        {
            MultipartPart part = parser.getNextPart().sync();   // async -> sync
            System.out.println("== part ==");
            System.out.println(part.headers());
            ByteSource body = part.body();
            InputStream stream = new ByteSource2InputStream(body, Duration.ofSeconds(1));
            drain(stream);
        }
        catch (End end) // control exception from getNextPart()
        {
            System.out.println("== end of parts ==");
            break;
        }
    }

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