#5 Passing argument in Spring MVC

-
This tutorial is next step of my previous tutorial.

In this tutorial we will simply create:

  1. One login form.
  2. One success page
  3. One failure page
  4. Controller for redirection

1. Lets start with Login form as given below:


Please note that in form I have defined action as login_authenticate. This will be the REST api name which we will require to develop. Once login will press it will search for login_authenticate api.

2. Create Error page as below:


3.Create Welcome page as below:


Please note that I have used ${name}. It will pick value set via ModelMap ( see login_authenticate api below in blog.)


4. Create login api in ModelController to display login page:


5. Now create login_authenticate api which will be called for authentication. Please note that in below api we added some constant username/password for authentication. You can use your Db for the same:


In above api I just read value of JSP email and password field. After value is read i verify them with some values ( it can be your custom logic ). Based of result we redirect to welcome OR error page.

While redirecting to Welcome page I just set email in ModelMap that I can read back to welcome page and can display in UI.

Please note that if we write " redirect:<api name>" then we must write related api as well in the controller. So we have to write welcome and error api as given below:



By using redirect, we can update URL in browser as required.


So here are the final outputs sequently:






Comments

Post a Comment

Popular posts from this blog

#2 Simple Spring Rest Api with JDBC connection

-
Image
Before starting this tutorial, I am assuming that you guys have basic idea of Spring. If you don't have basic idea of simple Spring API then no worry :), I have written simple tutorial here to start with Spring Boot . This tutorial is next version of my first tutorial . In my first tutorial I explained that how can we make a simple REST api with Spring Boot .  So lets start with JDBC connection in some very simple steps: 1. Create DB schema and table I prefer MySqlWorkBench for this purpose ( you can use any way to create schema). For this tutorial I have named my db as test_db . This DB contains one Employee table with below schema: Table contains id, name and email of employee ( This is just for tutorial, You make table as per your requirement). Once you created table, Insert some dummy data for your REST api. Your api will be fetching this data and will return it as JSON. I have made some of dummy entries as below: 2. Add Maven depen
Read more

#1 My First Rest API With Spring Boot Freamwork

-
Image
I hope you must be familiar with Java . Spring is a Java framework which is used for Rest api development by using Java as language. If you want to have basic idea about spring then you can visit here . In this tutorial I will be focusing on simple rest api using Get method. Please follow steps below to create your first Rest api: 1. Create project schema: While creating project schema, we can simply create via eclipse by going file -> new -> Maven Project .  If we are using above method to create project schema then for Maven dependencies we will need to make entry in Pom.XML. To avoid that we can refer  start.spring.io . In this tutorial I will be creating project via this interface only. So lets avoid any more delay and start development in some very simple steps: Open website  start.spring.io  and enter group (package), Artifact (name). After this add all required dependencies. Initially we will required only Spring MVC dependency as in screenshot bel
Read more

Swift Initialization

-
Image
Swift has introduced new type of variables called Optional . These are used to hold nil value in swift. Because of these variable, there are some changes regarding initialization of variables. Here are details for the same:   1. It is must to have initializer in swift if using non-optional property.   2. You need to UnWrap optional variables before using them: 3. If Property can be nil then use ? after property, before setting any value: 4. If you unwrap the property while declaring, then you can use it directly. Please note that it is not considered as good practice as it may cause crash at run time. 5.  With Swift new version, you need to implement initWithCoder method if using init method. 6. Before accessing self properties ( eg view), you must call super class method during init and initWithCoder . 7.  You can create object before calling super method and after that can assign values to that object: 8.  You can
Read more