liyuxuan_gitProject/LoginService.java

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONObject;
 

public class LoginServlet extends HttpServlet {
     @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
 
        // 设置响应内容类型  
        response.setContentType("text/html;charset=utf-8");
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
 
        try (PrintWriter out = response.getWriter()) {
 
            //获得请求中传来的用户名和密码
            String account = request.getParameter("account").trim();
            String password = request.getParameter("password").trim();
 
            //密码验证结果
            Boolean verifyResult = verifyLogin(account, password);
 
            Map<String, String> params = new HashMap<>();
            JSONObject jsonObject = new JSONObject();
 
            if (verifyResult) {
                params.put("Result", "success");
            } else {
                params.put("Result", "failed");
            }
 
            jsonObject.put("params", params);
            out.write(jsonObject.toString());
        }
    }
 
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }
    //验证用户名密码是否正确
    private Boolean verifyLogin(String userName, String password) {
        User user = UserDAO.queryUser(userName);
        //账户密码验证
        return null != user && password.equals(user.getPassword());
    }
}