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POHow to through a java application to transfer data to the servlet
 

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  1. POHow to through a java application to transfer data to the servlet
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    <p>I want to pass a java application sent a string that is a json,it isn't get this json in servlet, how do I do, who can help me? This is my servlet code:</p> <pre><code>public void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { BufferedInputStream in = new BufferedInputStream(req.getInputStream()); byte[] data = null; byte[] bts = new byte[1024]; int index; while ((index = in.read(bts)) &gt;= 0) { if (data == null) { data = new byte[index]; System.arraycopy(bts, 0, data, 0, index); } else { byte[] tmp = data; data = new byte[tmp.length + index]; System.arraycopy(tmp, 0, data, 0, tmp.length); System.arraycopy(bts, 0, data, tmp.length, index); } } String json = new String(data); System.out.print(json); } </code></pre> <p>and this is my java application:</p> <pre><code>String _url = "http://localhost:8080/jsf/test"; URL url = null; HttpURLConnection urlconn = null; String json = URLEncoder.encode(JSONObject.fromObject(req) .toString(), "UTF-8"); url = new URL(_url); urlconn = (HttpURLConnection) url.openConnection(); urlconn.setRequestMethod("POST"); urlconn.setDoOutput(true); urlconn.setDoInput(true); OutputStream out = urlconn.getOutputStream(); out.write(json.getBytes("UTF-8")); out.flush(); out.close(); BufferedReader rd = new BufferedReader(new InputStreamReader( urlconn.getInputStream(), "UTF-8")); StringBuffer sb = new StringBuffer(); int ch; while ((ch = rd.read()) &gt; -1) { sb.append((char) ch); } System.out.println(sb); rd.close(); </code></pre>
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    1. COYour code never sends the JSON. Send it to the connection's output stream, then tell you precisely what happens.
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    2. COI hava tried output stream like thisOutputStream out = urlconn.getOutputStream(); out.write(json.getBytes("UTF-8")); out.flush(); out.close();but is not work
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    3. CO"It doesn't work" is a very poor description of the problem. What doesn't work? How doesn't it work? If you get an exception, what's the stack trace? When you go to the doctor, you don't just say "I'm sick, it hurts". You describe the symptoms, what you feel, where. Same here.
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