{"id":95,"date":"2019-03-07T12:51:44","date_gmt":"2019-03-07T12:51:44","guid":{"rendered":"https:\/\/www.kindsonthegenius.com\/spring-boot\/?p=95"},"modified":"2020-07-26T08:13:13","modified_gmt":"2020-07-26T08:13:13","slug":"12-spring-boot-write-post-methods","status":"publish","type":"post","link":"https:\/\/kindsonthegenius.com\/spring-boot\/12-spring-boot-write-post-methods\/","title":{"rendered":"Spring Boot – Write POST Methods"},"content":{"rendered":"

In this lesson we would write the post methods. This method would lets use insert new records. For example, create new user, new location and new post.<\/p>\n

 <\/p>\n

    \n
  1. Create New Location<\/a><\/li>\n
  2. Install Advanced REST Client<\/a><\/li>\n
  3. Test the POST Method<\/a><\/li>\n
  4. Create new User<\/a><\/li>\n
  5. Create new Post<\/a><\/li>\n<\/ol>\n

     <\/p>\n

    1. Create New Location<\/strong><\/h4>\n

    We start by creating a new location. To insert a new resource, the HTTP method will be POST. This would be added as part of the parameters to the RequestMapping annotation as show below.<\/p>\n

     <\/p>\n

    @RequestMapping<\/span>(method=RequestMethod.POST<\/span>, value=\"\/locations\"<\/span>)\r\n    public<\/span> void<\/span> addLocation<\/span>() {\r\n\t\t\r\n}\r\n<\/pre>\n
     <\/p>\n
    You can see that the url for inserting a new location is same as the url for getAllLocations. We used this when we created the GET methods.<\/a><\/p>\n
    The complete method is given below:<\/p>\n
     <\/p>\n
    @RequestMapping<\/span>(<\/span>method=<\/span>RequestMethod.<\/span>POST<\/span>,<\/span> value=<\/span>\"\/locations\"<\/span>)<\/span>\r\npublic<\/span> void<\/span> addLocation<\/span>(<\/span>@RequestBody<\/span> Location location)<\/span> {<\/span>\r\n\tlocationService.<\/span>addLocation<\/span>(<\/span>location);<\/span>\r\n}<\/span>\r\n<\/pre>\n
     <\/p>\n
    Now, the addLocation() method have not been implemented in the LocationService. So you need to create this method in the LocationService class.<\/p>\n
    Put the code below in the LocationService<\/p>\n
     <\/p>\n
    <\/p>\n
    public<\/span> void<\/span> addLocation<\/span>(<\/span>Location location)<\/span> {<\/span>\r\n     locations.<\/span>add<\/span>(<\/span>location);<\/span>\r\n}<\/span>\r\n<\/pre>\n
     <\/p>\n
    Next, we are going to test the post methods.To do this we would need a tool.<\/p>\n
     <\/p>\n
     <\/p>\n
    2. Install Advanced REST Client<\/strong><\/h4>\n
    To make a POST request, we need to provide the data we want to insert. Since this is an API, we don’t have a HTML form to fill in this data.<\/p>\n
    So to provide input, we need to use a tool called Advanced REST Client. This is a free plugin to Google Chrome.<\/p>\n
    To install it, visit this link (Get Advanced REST Client<\/a>) and just install it. Next, launch it. The interface is as shown below. You can watch the video to see the procedure.<\/p>\n
    Watch the video of How to Use Advanced REST Client<\/a><\/p>\n
    \"\"<\/p>\n
     <\/p>\n
     <\/p>\n
    3. Test the POST Method<\/strong><\/h4>\n
    Before you do the test, you need to make a little change to the locations variable in the LocationService class.<\/p>\n
    Replace this existing location variables,<\/p>\n
    List<<\/span>Location><\/span> locations =<\/span> Arrays.<\/span>asList<\/span>(<\/span>location1,<\/span> location2,<\/span> location3);<\/span>\r\n<\/pre>\n
     <\/p>\n
    with this one;<\/p>\n
    <\/p>\n
    List<<\/span>Location><\/span> locations =<\/span> new<\/span> ArrayList<>(<\/span>Arrays.<\/span>asList<\/span>(<\/span>location1,<\/span> location2,<\/span> location3));<\/span>\r\n<\/pre>\n
     <\/p>\n
    This would make it possible to modify the ArrayList<\/p>\n
    Now, test the POST Method using Advanced REST Client.<\/p>\n
     <\/p>\n
     <\/p>\n
    4. Create New User<\/strong><\/h4>\n
    Write the addUser method in the UserController class.<\/p>\n
    In the controller file, replace the line:<\/p>\n
    <\/p>\n
    private<\/span> List<<\/span>User><\/span> users =<\/span> Arrays.<\/span>asList<\/span>(<\/span>user1,<\/span> user2);<\/span>\t\r\n<\/pre>\n
     <\/p>\n
    with this one<\/p>\n
     <\/p>\n
    private<\/span> List<<\/span>User><\/span> users =<\/span> new<\/span> ArrayList<>(<\/span>Arrays.<\/span>asList<\/span>(<\/span>user1,<\/span> user2));<\/span>\r\n<\/pre>\n
     <\/p>\n
    The addUser method for the UserController class is given below. You can copy and paste it.<\/p>\n
     <\/p>\n
    <\/p>\n
    @RequestMapping<\/span>(<\/span>value=<\/span>\"\/users\"<\/span>,<\/span> method =<\/span> RequestMethod.<\/span>POST<\/span>)<\/span>\r\npublic<\/span> void<\/span> addUser<\/span>(<\/span>@RequestBody<\/span> User user)<\/span> {<\/span>\r\n\tuserService.<\/span>addUser<\/span>(<\/span>user);<\/span>\r\n}<\/span>\r\n<\/pre>\n
     <\/p>\n
    Finally, place the addUser method for the UserService class<\/p>\n
     <\/p>\n
    <\/p>\n
    public<\/span> void<\/span> addUser<\/span>(<\/span>User user)<\/span> {<\/span>\r\n    users.<\/span>add<\/span>(<\/span>user);<\/span>\r\n}<\/span>\r\n<\/pre>\n
     <\/p>\n
    You can then test the application using Advanced REST Client. Try to add a new User.<\/p>\n
     <\/p>\n
     <\/p>\n
    5. Create New Post<\/strong><\/h4>\n
    Finally, we would work on inserting a new Post. As before, replace this line in PostService<\/p>\n
    <\/p>\n
    List<<\/span>Post><\/span> posts =<\/span> Arrays.<\/span>asList<\/span>(<\/span>post1,<\/span> post2);<\/span>\r\n<\/pre>\n
     <\/p>\n
    with this one:<\/p>\n
    <\/p>\n
    List<<\/span>Post><\/span> posts =<\/span> new<\/span> ArrayList<>(<\/span>Arrays.<\/span>asList<\/span>(<\/span>post1,<\/span> post2));<\/span>\r\n<\/pre>\n
     <\/p>\n
    The addPost method for the PostController class is as shown below<\/p>\n
     <\/p>\n
    <\/p>\n
    @RequestMapping<\/span>(<\/span>value =<\/span> \"\/posts\"<\/span>,<\/span> method =<\/span> RequestMethod.<\/span>POST<\/span>)<\/span>\r\npublic<\/span> void<\/span> addPost<\/span>(<\/span>@RequestBody<\/span> Post post)<\/span> {<\/span>\r\n     postService.<\/span>addPost<\/span>(<\/span>post);<\/span>\r\n}<\/span>\r\n<\/pre>\n
     <\/p>\n
    The addPost method for the PostService class is as below:<\/p>\n
    <\/p>\n
    public<\/span> void<\/span> addPost<\/span>(<\/span>Post post)<\/span> {<\/span>\r\n     posts.<\/span>add<\/span>(<\/span>post);<\/span>\r\n}<\/span>\r\n<\/pre>\n
     <\/p>\n
    At this point, you have completed the POST methods. Next, we are going to write the Update and Delete methods<\/p>\n","protected":false},"excerpt":{"rendered":"
    In this lesson we would write the post methods. This method would lets use insert new records. For example, create new user, new location and … <\/p>\n","protected":false},"author":1,"featured_media":104,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-95","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-spring-boot-tutorials"],"_links":{"self":[{"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/posts\/95","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/comments?post=95"}],"version-history":[{"count":4,"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/posts\/95\/revisions"}],"predecessor-version":[{"id":234,"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/posts\/95\/revisions\/234"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/media\/104"}],"wp:attachment":[{"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/media?parent=95"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/categories?post=95"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kindsonthegenius.com\/spring-boot\/wp-json\/wp\/v2\/tags?post=95"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}