从 Servlet 发出 URL 请求并保留 Header 信息

发布于 2024-07-17 01:37:05 字数 648 浏览 8 评论 0原文

我需要从 servlet 发出请求，但我还需要保留所有标头信息。那是在请求对象中。

例如，如果我从 doGet 方法执行类似以下操作，是否有一种简单的方法将该信息传递给 URL Connection 对象？

URL url = new URL();
URLConnection uc = url.openConnection();
uc.setDoOutput(true);
uc.setDoInput(true);
uc.setUseCaches(false);

uc.setRequestProperty("Content-type",
"application/x-www-form-urlencoded");

DataOutputStream dos = new DataOutputStream(uc.getOutputStream());
dos.writeBytes(strInEnc);
dos.flush();
dos.close();

InputStreamReader in = new InputStreamReader(uc.getInputStream());
int chr = in.read();
while (chr != -1) {
taResults.append(String.valueOf((char) chr));
chr = in.read();

原文

I need to make a request from a servlet but I also need to retain all the header information. That is in the request object.

For example, I if I do something like the following from the doGet method, is there a simple way to just pass that information to the URL Connection object?

URL url = new URL();
URLConnection uc = url.openConnection();
uc.setDoOutput(true);
uc.setDoInput(true);
uc.setUseCaches(false);

uc.setRequestProperty("Content-type",
"application/x-www-form-urlencoded");

DataOutputStream dos = new DataOutputStream(uc.getOutputStream());
dos.writeBytes(strInEnc);
dos.flush();
dos.close();

InputStreamReader in = new InputStreamReader(uc.getInputStream());
int chr = in.read();
while (chr != -1) {
taResults.append(String.valueOf((char) chr));
chr = in.read();

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你爱我像她 2024-07-24 01:37:05

使用 URLConnection 的addRequestProperty 方法。

Enumeration<?> names = req.getHeaderNames();
while (names.hasMoreElements()) {
  String key = (String) names.nextElement();
  Enumeration<?> values = req.getHeaders(key);
  while (values.hasMoreElements()) {
    uc.addRequestProperty(key, (String) values.nextElement());
  }
}

如果您使用 HttpClient，您将拥有一组类似的循环，除非它具有对 ServletRequest 传递的内置支持。（如果没有，为什么还要费心去处理一大堆额外的依赖项和非标准 API？）

Use the addRequestProperty method of URLConnection.

Enumeration<?> names = req.getHeaderNames();
while (names.hasMoreElements()) {
  String key = (String) names.nextElement();
  Enumeration<?> values = req.getHeaders(key);
  while (values.hasMoreElements()) {
    uc.addRequestProperty(key, (String) values.nextElement());
  }
}

You'll have a similar set of loops if you use HttpClient, unless it has built-in support for pass-through of a ServletRequest. (And if it doesn't, why bother with a huge set of additional dependencies, and non-standard API?)

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