public class GreetingServlet extends HttpServlet {
//使用doget方法，传入request和response两个参数，返回text/html且最大字节数为8192
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
response.setBufferSize(8192);
//向客户端浏览器页面输入前端数据
try (PrintWriter out = response.getWriter()) {
out.println("<html lang=\"en\">"
+ "<head><title>Servlet Hello</title></head>");
// then write the data of the response
out.println("<body bgcolor=\"#ffffff\">"
+ "<img src=\"resources/images/duke.waving.gif\" "
+ "alt=\"Duke waving his hand\">"
+ "<form method=\"get\">"
+ "<h2>Hello, my name is Duke. What‘s yours?</h2>"
+ "<input title=\"My name is: \" type=\"text\" "
+ "name=\"username\" size=\"25\"/>"
+ "<p></p>"
+ "<input type=\"submit\" value=\"Submit\"/>"
+ "<input type=\"reset\" value=\"Reset\"/>"
+ "</form>");
String username = request.getParameter("username");
if (username != null && username.length() > 0) {
RequestDispatcher dispatcher =
getServletContext().getRequestDispatcher("/response");//若username不为空，则使用dispatcher接收客户端请求并发送到服务器
if (dispatcher != null) {
dispatcher.include(request, response);//若客户端请求不为空，则响应资源
}
}
out.println("</body></html>");
}
}
@Override
public String getServletInfo() {
return "The Hello servlet says hello.";
}
}
@WebServlet("/response")
public class ResponseServlet extends HttpServlet {
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
try (PrintWriter out = response.getWriter()) {
//对用户输入的信息进行判别，并通过responseServlet进行处理
String username = request.getParameter("username");
if (username != null && username.length() > 0) {
out.println("<h2>Hello, " + username + "!</h2>");
}
}
}
@Override
public String getServletInfo() {
return "The Response servlet says hello.";
原文：https://www.cnblogs.com/chhhh/p/10591798.html