Question

有以下代码：

private static String doPostRequest(List<NameValuePair> params, String url) throws ClientProtocolException, IOException {
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost(url);

    httppost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
    HttpResponse response = httpclient.execute(httppost); 

    return getContentFromInputStream(response.getEntity().getContent());
} 

private static String getContentFromInputStream(InputStream is) throws IOException {
    String line;
    StringBuilder sb=new StringBuilder();
    BufferedReader reader=new BufferedReader(new InputStreamReader(is));
    while((line=reader.readLine())!=null) {
        sb.append(line);
    }
    reader.close();
    return sb.toString();
}

那么，如何在POST请求中添加一些图像（例如File f）？提前致谢。

Answer 1

这是Servlet 3的“多部分文件上传”的一部分。

您将构建映像的blob，然后将其发布到Servlet 3端点。

查看示例here和here

如果您计划使用Spring，那么有一些非常好的简单注释来定义您的控制器，它们可以与文件上传一起使用，您可以看到here

Answer 2

您可以使用MultipartRequestEntity。

        File f = new File(filePath);
        PostMethod postMessage = new PostMethod(urlString);
        Part[] parts = {
                new StringPart("param", "value"),
                new FilePart(f.getName(), f)
        };
        postMessage.setRequestEntity(new MultipartRequestEntity(parts, postMessage.getParams()));
        HttpClient client = new HttpClient();

        int status = client.executeMethod(postMessage);

如何在POST请求Java中添加图像？

2 个答案: