修改

demo/src/main/java/com/example/demo/loanService/controller/startController.java

@@ -7,10 +7,12 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 
+import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
+import java.io.IOException;
 
 @Controller
 public class startController extends HttpServlet {
@@ -18,17 +20,17 @@ public class startController extends HttpServlet {
     private userMapper userMapper;
 
     @RequestMapping("/start")//浏览商品之后点击申请贷款的按钮之后跳到的界面
-    public String doPost(HttpServletResponse response, HttpServletRequest request){
+    public void doPost(HttpServletResponse response, HttpServletRequest request)throws ServletException, IOException {
         HttpSession session=request.getSession();
         User user=new User();
         user=(User)session.getAttribute("user");
         short num=userMapper.selectIsId(user.getUserNum());
         if(num==1){
-            return "";//验证手机号的界面二号
+            response.sendRedirect("loanInformation.html");//贷款的界面
         }if(num==0){
-            return "";//认证的界面
+            response.sendRedirect("Register.html");//认证的界面
         }else{
-            return "";//页面出错的界面
+            response.sendRedirect("");//页面出错的界面
         }
     }
 }

demo/src/main/resources/static/index.html

@@ -32,9 +32,11 @@
                             <h2>50,000.00</h2>
                             <h3>3分钟申请，5秒审批</h3>
                         </div>
+                        <form action="/start">
                         <div class="aui-borrow-flex-bd">
-                            <button onclick="location.href='loanInformation.html'">我要借钱</button>
+                            <input typy="submit" value="我要借钱" name="su">
                         </div>
+                        </form>
                     </div>
                 </div>
                 <div class="aui-palace clearfix">