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我的目标是从Java应用程序(JA)向servlet(S)发送简单消息并将其显示在浏览器页面上。我希望每次运行servlet类(刷新浏览器页面)时,都会收到消息。将消息从Java应用程序发送到servlet并显示它
我使用BufferedWriter在S上传输JA和BufferedReader上的输出以接收它,但我想我做错了什么。
下面是从JA的代码片段:
try{
URL url = new URL("http://(/*ip address*/:8080/FirstServlet/myfirstservlet");
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream()));
out.write("testing");
out.flush();
out.close();
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String response;
while((response = in.readLine()) != null) {
//System.out.println(response);
}
in.close();
}
catch (MalformedURLException ex) {
ex.printStackTrace();
}
catch (IOException iex) {
iex.printStackTrace();
}
下面是从S码:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class FirstServlet extends HttpServlet {
private final static String _USERNAME = "username";
public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException , IOException {
PrintWriter out = res.getWriter();
BufferedReader bufferedReader = null;
StringBuilder stringBuilder = new StringBuilder();
char test = 'a';
try{
InputStream inputStream = req.getInputStream();
if (inputStream != null) {
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
char[] charBuffer = new char[128];
int bytesRead = -1;
while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
stringBuilder.append(charBuffer, 0, bytesRead);
out.println(charBuffer); //expecting this to be displayed on browser
}
} else {
stringBuilder.append("");
out.println("0");
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
我试图在同时包装我的JA的代码(在自己的线程中运行)(真)循环,但似乎没有帮助。任何帮助,将不胜感激。谢谢!
我相信你需要使用' HttpURLConnection'而不是'URLConnection',并且调用'setRequestMethod(“GET”)'来启动正确的HTTP通信,所以servlet容器知道调用哪个servlet的方法。 –
@Jozef:不,OP只是在寻找推动力,但基本概念错了。 KS7X,你的servlet基本上是回应Java应用程序(在'response'变量中),而不是你所期望的“浏览器页面”。哪些对解决您的问题最有帮助? http://stackoverflow.com/q/25947790或http://stackoverflow.com/q/32426674? – BalusC
感谢@BalusC,这两个链接都给我一个新的途径,让我的申请工作。 – KS7X