JSP利用JFreeChart生成折线图

package Test1; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TestServlet extends HttpServlet { /** * * 2017年8月3日 下午9:30:23 * @author Joker */ private static final long serialVersionUID = 6574194186452705543L; /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text"); String username = request.getParameter("username"); System.out.println(username); PrintWriter out = response.getWriter(); out.write(username); request.getRequestDispatcher("index.jsp").forward(request, response); out.flush(); out.close(); } public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text"); String username = request.getParameter("username"); System.out.println(username); PrintWriter out = response.getWriter(); out.write(username); request.getRequestDispatcher("index.jsp").forward(request, response); out.flush(); out.close(); } }