Question

我有以下代码：

HttpGet httpGet = new HttpGet(serverAdress + "/rootservices");
        httpGet.setHeader("Accept", "text/xml");
        HttpResponse response = client.execute(httpGet, localContext);

        String projectURL = XMLDocumentParser.parseDocument(response.getEntity().getContent(), "oslc_scm:scmServiceProviders", "rdf:resource");
        String workItemURL = XMLDocumentParser.parseDocument(response.getEntity().getContent(), "oslc_cm:cmServiceProviders", "rdf:resource");

这里的问题是我读了两次HttpResponse对象。所以我第二次得到例外。但是虽然我知道这个问题，但我找不到一个简单的解决方案。那么什么是解决这个问题的好方法呢？

Answer 1

将response.getEntity().getContent()返回的输入流读入存储在局部变量中的byte[]。请参阅Convert InputStream to byte array in Java。

byte[] content = IOUtils.toByteArray(response.getEntity().getContent());

String projectURL = XMLDocumentParser.parseDocument(new ByteArrayInputStream(content), "oslc_scm:scmServiceProviders", "rdf:resource");
String workItemURL = XMLDocumentParser.parseDocument(new ByteArrayInputStream(content), "oslc_cm:cmServiceProviders", "rdf:resource");

Answer 2

仅读取一次响应内容，并将其复制到与XMLDocumentParser.parseDocument兼容的某种缓冲区。然后直接从缓冲区解析数据，并根据需要多次。

Answer 3

你为什么不这样试试呢？

HttpGet httpGet = new HttpGet(serverAdress + "/rootservices");
        httpGet.setHeader("Accept", "text/xml");
        InputStream in = null;
        HttpResponse response = client.execute(httpGet, localContext);

        in = response.getEntity().getContent();
        String projectURL = XMLDocumentParser.parseDocument(in, "oslc_scm:scmServiceProviders", "rdf:resource");
        String workItemURL = XMLDocumentParser.parseDocument(in, "oslc_cm:cmServiceProviders", "rdf:resource");

IllegalStateException：内容已被占用 - 如何解决？

3 个答案: