ADD file via upload

src/app/src/main/java/com/sbw/atrue/Order/Util/RegisterServlet.java

@@ -0,0 +1,51 @@
+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 RegisterServlet extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response)
+            throws ServletException, IOException {
+        doPost(request, response);
+    }
+    @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();
+            
+             Map<String, String> params = new HashMap<>();
+            JSONObject jsonObject = new JSONObject();
+            if(isExist(account)){
+                params.put("Result", "账号已存在");
+            }else{
+                UserDAO.Register(account, password);
+                params.put("Result", "注册成功");
+            }
+             jsonObject.put("结果", params);
+            out.write(jsonObject.toString());
+        }
+    }
+    //判断用户是否存在
+     private Boolean isExist(String account) {
+        User user = UserDAO.queryUser(account);
+        if(user.getAccount().isEmpty()){
+            return false;
+        }else{
+            return true;
+        }
+    }
+}