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我想从android应用程序发送字符串数据到servlet，但我在servlet中获得了空值。 在这里，我提供我的代码如何使用httppost方法从android应用程序发送数据到servlet？
Android的代码是：
HttpPost post = new HttpPost("http://localhost:8081/HttpGetServlet/HttpGetServlet");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("Email", email));
nameValuePairs.add(new BasicNameValuePair("Passwd", password));
post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = client.execute(post);
Sevlet代码是：
public class HelloWorldServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public HelloWorldServlet() {
super();
}
protected void doGet(HttpServletRequest request,HttpServletResponseresponse)throwsServletException, IOException {
PrintWriter out = response.getWriter();
String fname = (String) request.getParameter("param1");
out.println("Hello my 1st name is : "+fname);
String lname = (String) request.getParameter("lastName");
out.println("Hello my last name is : "+lname);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
String json_array = request.getParameter("username");
out.println("hi ::::::::::"+json_array);
}
}
任何一个有想法，请帮助我。提前致谢。