java - 使用 HttpResponseInterceptor 来操作响应

Question

使用 Apache HttpClient，可以通过添加 HttpResponseIntercepter 来操作检索到的内容。有了这个，添加 header 属性就变得非常容易。但是如何操作检索到的 HttpEntity 的内容呢？

例如，我喜欢将所有文本转换为大写。

@Test
public void shoudConvertEverythingToUpperCase() throws ClientProtocolException, IOException
{
    final DefaultHttpClient defaultHttpClient = new DefaultHttpClient();

    defaultHttpClient.addResponseInterceptor(new HttpResponseInterceptor() {

        @Override
        public void process(final HttpResponse response, final HttpContext context) throws HttpException, IOException
        {
            final HttpEntity entity = response.getEntity();

            final HttpEntity upperCaseEntity = makeAllUppercase(entity);

            response.setEntity(upperCaseEntity);
        }

        private HttpEntity makeAllUppercase(final HttpEntity entity)
        {
            // how to uppercase everything and return the cloned HttpEntity
            return null;
        }
    });

    final HttpResponse httpResponse = defaultHttpClient.execute(new HttpGet("http://stackoverflow.com"));

    assertTrue(StringUtils.isAllUpperCase(EntityUtils.toString(httpResponse.getEntity())));
}

Answer 1

private HttpEntity makeAllUppercase(final HttpEntity entity)
{
    Header h = entity.getContentType();
    ContentType contentType = h != null ? ContentType.parse(h.getValue()) : ContentType.DEFAULT_TEXT;
    String content = EntityUtils.toString(entity, contentType.getCharset());
    return new StringEntity(content.toUpperCase(Locale.US), contentType);
}

由于内存中内容的中间缓冲，这不是最有效的，而是最简洁的实现。