客户端 HttpUtils.java

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 LoginAction extends HttpServlet { /** * Constructor of the object. */ public LoginAction() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * 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 { this.doPost(request, response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to * post. * * @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 doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8"); //客户端 HttpUtils并没有写request方法是post ,但服务器端可自动识别 String method = request.getMethod(); System.out.println("request method :"+method); PrintWriter out = response.getWriter();String username = request.getParameter("username");System.out.println("-username->>"+username); String password = request.getParameter("password");System.out.println("-password->>"+password); if (username.equals("admin") && password.equals("123")) { // 表示服务器段返回的结果 out.print("login is success !"); } else { out.print("login is fail !"); } out.flush(); out.close(); } /** * Initialization of the servlet. <br> * * @throws ServletException    * if an error occurs */ public void init() throws ServletException { // Put your code here } }