发布xml文档,但不是通过请求参数,而是在正文中

时间:2012-04-22 16:58:33

标签: java servlets spring-mvc

我目前使用以下网址将xml文件发布到网址:

HttpClient client = new HttpClient();
HttpPost post = new HttpPost("http://www.example.com/post/here");

File f = new File("/path/to/file/file.txt");
String str = Files.toString(f, Charset,defaultCharset());

List<NameValuePair> nvp = new ArrayList<NameValuePair>(1);
nvp.add(new BasicNameValuePair("payload", xmlFile));

post.setEntity(new UrlEncodedFormEntity(nvp));

HttpResponse response = client.execute(post);

但这是添加&#34;有效载荷&#34;的请求参数。这样当我想在我的doPost servlet中接收值时,我会这样做:

request.getParameter("payload");

我猜这个参数&#34;有效载荷&#34;在请求标题中?

我想要做的是将此文件发送到请求正文中,因此在我的doPost中,我必须从流中获取数据,即:

... = request.getInputStream();

如何修改我的代码才能执行此操作? (使用httpclient)

另外,有人可以解释2在请求格式方面的差异吗?

1 个答案:

答案 0 :(得分:1)

Apache documentation on HttpClient有一个请求中的流数据示例:

public class FileRequestEntity implements RequestEntity {

    private File file = null;

    public FileRequestEntity(File file) {
        super();
        this.file = file;
    }

    public boolean isRepeatable() {
        return true;
    }

    public String getContentType() {
        return "text/plain; charset=UTF-8";
    }

    public void writeRequest(OutputStream out) throws IOException {
        InputStream in = new FileInputStream(this.file);
        try {
            int l;
            byte[] buffer = new byte[1024];
            while ((l = in.read(buffer)) != -1) {
                out.write(buffer, 0, l);
            }
        } finally {
            in.close();
        }
    }

    public long getContentLength() {
        return file.length();
    }
}

File myfile = new File("myfile.txt");
PostMethod httppost = new PostMethod("/stuff");
httppost.setRequestEntity(new FileRequestEntity(myfile));

至于两者的区别,它们都将数据存储在HTTP请求的主体中。作为example,以下是具有两个URL编码参数(homefavorite flavor)的标准HTTP POST请求。直接使用输入流也会稍微提高效率,因为不需要解析参数。

POST /path/script.cgi HTTP/1.0
From: frog@jmarshall.com
User-Agent: HTTPTool/1.0
Content-Type: application/x-www-form-urlencoded
Content-Length: 32

home=Cosby&favorite+flavor=flies