如何模拟javax.servlet.ServletInputStream

Question

我正在创建一些单元测试并尝试模拟一些调用。这是我的工作代码中的内容：

String soapRequest = (SimUtil.readInputStream(request.getInputStream())).toString();
if (soapRequest.equals("My String")) { ... }

SimUtil.readInputSteam看起来像这样：

StringBuffer sb = new StringBuffer();
BufferedReader reader = null;
try  {
    reader = new BufferedReader(new InputStreamReader(inputStream));
    final int buffSize = 1024;
    char[] buf = new char[buffSize];
    int numRead = 0;
    while ((numRead = reader.read(buf)) != -1) {
        String readData = String.valueOf(buf, 0, numRead);
        sb.append(readData);
        buf = new char[buffSize];
    }
} catch (IOException e) {
    LOG.error(e.getMessage(), e);
} finally {
    try {
        if (reader != null) {
            reader.close();
        }
    } catch (IOException e) {
        LOG.error(e.getMessage(), e);
    }
}

我正在尝试做的是request.getInputStream（），该流返回某些字符串。

HttpServletRequest request = mock(HttpServletRequest.class);
ServletInputStream inputStream = mock(ServletInputStream.class);
when(request.getInputStream()).thenReturn(inputStream);

所以这是我想要调节的代码

when(inputStream.read()).thenReturn("My String".toInt());

任何帮助将不胜感激。

Answer 1

不要嘲笑输入流。相反，使用 getBytes（） 方法。然后创建一个 ByteArrayInputStream，将数组作为输入，以便在使用时返回字符串，一次返回每个字节。接下来，创建一个 ServletInputStream，它包装一个常规的 InputStream，就像 Spring 中的那个一样：

public class DelegatingServletInputStream extends ServletInputStream {
    private final InputStream sourceStream;

    /**
     * Create a DelegatingServletInputStream for the given source stream.
     * @param sourceStream the source stream (never <code>null</code>)
     */
    public DelegatingServletInputStream(InputStream sourceStream) {
        Assert.notNull(sourceStream, "Source InputStream must not be null");
        this.sourceStream = sourceStream;
    }
    /**
     * Return the underlying source stream (never <code>null</code>).
     */
    public final InputStream getSourceStream() {
        return this.sourceStream;
    }

    public int read() throws IOException {
        return this.sourceStream.read();
    }
    public void close() throws IOException {
        super.close();
        this.sourceStream.close();
    }
}

最后，HttpServletRequest 模拟将返回这个 DelegatingServletInputStream 对象。