Question

我通过http url连接从一个servlet向另一个servlet发送一个字符串：

final HttpURLConnection http = (HttpURLConnection) url.openConnection();     // here url is the url of the second servlet
http.setRequestMethod("POST");
http.setDoOutput(true);
http.setDoInput(true);
http.setUseCaches(false);
final OutputStream outstr = http.getOutputStream();
outstr.write(sb.toString().getBytes());
outstr.flush();
outstr.close();

我面临的问题是将其作为来自另一个servlet的请求读取。我试着在第二个servlet的getPost方法中编写以下代码，但这不起作用：

try {
        int len = req.getContentLength();
        byte[] input = new byte[len];
        ServletInputStream sin = req.getInputStream();
        int c, count = 0;
        while ((c = sin.read(input, count, input.length - count)) != -1) {
            count += c;
        }
        sin.close();
        String inString = new String(input);
        String decodedString = URLDecoder.decode(inString, "UTF-8");
        log.info("Response received - ");
        log.info(decodedString);
        resp.getWriter().write(decodedString);
        resp.getWriter().flush();
        resp.getWriter().close();
    } catch (IOException e) {

    }

有人可以帮助获取第一个servlet发送的字符串并显示它的正确方法吗？

Answer 1

你可以把你的字符串写成servlet中的参数，在servlet中发布并作为参数接收它。

发布的Servlet：

outstr.write(("your_param=" + sb.toString()).getBytes());

接收的Servlet：

String yourParamValue = request.getParameter("your_param");

Answer 2

试试这段代码，它应该解决这个问题

try {

        BufferedReader reader = request.getReader();
        StringBuilder inputStringBuilder = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            inputStringBuilder.append(line).append("\n");

        }

        String requestData = inputStringBuilder.toString();
        reader.close();

        resp.getWriter().write(requestData);
        resp.getWriter().flush();
        resp.getWriter().close();

    } catch (IOException e) {

        e.printStacktrace();
    }

一个servlet通过http post将字符串传递给另一个servlet

2 个答案: