{"id":106837,"date":"2020-09-22T10:00:00","date_gmt":"2020-09-22T07:00:00","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=106837"},"modified":"2020-09-18T11:58:59","modified_gmt":"2020-09-18T08:58:59","slug":"reduce-repetitive-code-in-spring-mvc-controllers","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2020\/09\/reduce-repetitive-code-in-spring-mvc-controllers.html","title":{"rendered":"Reduce Repetitive Code in Spring MVC Controllers"},"content":{"rendered":"

After spending some time doing sustained engineering (a.k.a. maintaining legacy code), I ventured to reduce repetitive code in Spring MVC @Controller<\/code>s. I started with an abstract base controller class. But I soon found out that it was a dead-end because @RequestMapping<\/code> is not<\/em> inherited from (or combined with) parent classes and\/or interfaces (see Spring MVC @RequestMapping<\/code> Inheritance<\/a>).<\/p>\n

With some free time to further think about this, I took different approach.<\/p>\n

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01<\/div>\n
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\n
\n
@Controller<\/code><\/div>\n
public<\/code> class<\/code> RepositoryCrudController {<\/code><\/div>\n
 <\/div>\n
    <\/code>private<\/code> final<\/code> Repositories repositories;<\/code><\/div>\n
    <\/code>private<\/code> final<\/code> RepositoryInvokerFactory repositoryInvokerFactory;<\/code><\/div>\n
 <\/div>\n
    <\/code>\/\/ ...<\/code><\/div>\n
 <\/div>\n
    <\/code>@RequestMapping<\/code>(<\/code>\"\/{repository}\"<\/code>)<\/code><\/div>\n
    <\/code>String index(<\/code>@PathVariable<\/code>(<\/code>\"repository\"<\/code>) String repositoryKey,<\/code><\/div>\n
            <\/code>Pageable pageable, Model model) {<\/code><\/div>\n
        <\/code>\/\/ ... (only if repository has findAll(Pageable) method)<\/code><\/div>\n
        <\/code>return<\/code> repositoryKey + <\/code>\"\/index\"<\/code>;<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
    <\/code>@GetMapping<\/code>(<\/code>\"\/{repository}\/{id}\"<\/code>)<\/code><\/div>\n
    <\/code>String show(<\/code>@PathVariable<\/code>(<\/code>\"repository\"<\/code>) String repositoryKey,<\/code><\/div>\n
            <\/code>@PathVariable<\/code>(<\/code>\"id\"<\/code>) Object id, Model model) {<\/code><\/div>\n
        <\/code>\/\/ ... (only if repository has findById method)<\/code><\/div>\n
        <\/code>return<\/code> repositoryKey + <\/code>\"\/show\"<\/code>;<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
    <\/code>@GetMapping<\/code>(path = <\/code>\"\/{repository}\"<\/code>, param = <\/code>\"create\"<\/code>)<\/code><\/div>\n
    <\/code>String create(...) {<\/code><\/div>\n
        <\/code>\/\/ ... (only if repository has save method)<\/code><\/div>\n
        <\/code>return<\/code> repositoryKey + <\/code>\"\/create\"<\/code>;<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
    <\/code>@PostMapping<\/code>(<\/code>\"\/{repository}\"<\/code>)<\/code><\/div>\n
    <\/code>String save(...) {<\/code><\/div>\n
        <\/code>\/\/ ... (only if repository has save method)<\/code><\/div>\n
        <\/code>return<\/code> \"redirect:\/\"<\/code> + repositoryKey + <\/code>\"\/{id}\"<\/code>;<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
    <\/code>@GetMapping<\/code>(path = <\/code>\"\/{repository}\/{id}\"<\/code>, param = <\/code>\"edit\"<\/code>)<\/code><\/div>\n
    <\/code>\/\/ ... edit (only if repository has findById and save methods)<\/code><\/div>\n
    <\/code>@PutMapping<\/code>(<\/code>\"\/{repository}\/{id}\"<\/code>)<\/code><\/div>\n
    <\/code>\/\/ ... update (only if repository has save method)<\/code><\/div>\n
    <\/code>\/\/ @DeleteMapping(\"\/{repository}\/{id}\")<\/code><\/div>\n
    <\/code>\/\/ ... delete (only if repository has deleteById method)<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

This approach is largely inspired by RepositoryEntityController<\/code> of Spring Data REST.

<\/div> <\/div><\/p>\n

Instead of defining an abstract base controller class, I created a concrete controller class with the default<\/em> (or repetitive) behavior. The default<\/em> behavior relies on invoking methods on Spring Data repositories.<\/p>\n

For custom controllers, instead of creating subclasses (of the abstract base class), the controller can simply define handler methods that behave differently. For example:<\/p>\n

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01<\/div>\n
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39<\/div>\n<\/td>\n
\n
\n
@Entity<\/code><\/div>\n
public<\/code> class<\/code> Article {...}<\/code><\/div>\n
 <\/div>\n
\/\/ Spring Data JPA<\/code><\/div>\n
public<\/code> interface<\/code> ArticleRepository <\/code>extends<\/code> CrudRepository<Article, ...> {...}<\/code><\/div>\n
 <\/div>\n
@Controller<\/code><\/div>\n
@RequestMapping<\/code>(<\/code>\"\/articles\"<\/code>)<\/code><\/div>\n
public<\/code> class<\/code> ArticlesController {<\/code><\/div>\n
 <\/div>\n
    <\/code>\/\/ no need for index() handler method<\/code><\/div>\n
    <\/code>\/\/ just set-up \"articles\/index\" view<\/code><\/div>\n
 <\/div>\n
    <\/code>\/\/ no need for show() handler method<\/code><\/div>\n
    <\/code>\/\/ just set-up \"articles\/show\" view<\/code><\/div>\n
 <\/div>\n
    <\/code>@GetMapping<\/code>(param = <\/code>\"create\"<\/code>)<\/code><\/div>\n
    <\/code>String create(Model model) {<\/code><\/div>\n
        <\/code>\/\/ Do something that is _not_ *default* behavior<\/code><\/div>\n
        <\/code>\/\/ e.g. provide options for dropdowns, or use form-backing object\/JavaBean<\/code><\/div>\n
        <\/code>\/\/ ...<\/code><\/div>\n
        <\/code>return<\/code> \"articles\/create\"<\/code>;<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
    <\/code>\/\/ no need for save() handler method<\/code><\/div>\n
    <\/code>\/\/ just set-up \"articles\/show\" view<\/code><\/div>\n
 <\/div>\n
    <\/code>@GetMapping<\/code>(path = <\/code>\"\/{id}\"<\/code>, param = <\/code>\"edit\"<\/code>)<\/code><\/div>\n
    <\/code>String edit(<\/code>@PathVariable<\/code>(<\/code>\"id\"<\/code>) ... id, Model model) {<\/code><\/div>\n
        <\/code>\/\/ Do something that is _not_ *default* behavior<\/code><\/div>\n
        <\/code>\/\/ e.g. provide options for dropdowns, or use form-backing object\/JavaBean<\/code><\/div>\n
        <\/code>\/\/ ...<\/code><\/div>\n
        <\/code>return<\/code> \"articles\/edit\"<\/code>;<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/div>\n
    <\/code>\/\/ no need for update() handler method<\/code><\/div>\n
    <\/code>\/\/ just set-up \"articles\/show\" view<\/code><\/div>\n
 <\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The above will work because Spring MVC chooses the more specific mapping first. When a GET \/articles?create<\/code> request is received, the ArticlesController<\/code> will be chosen to handle it (and not RepositoryCrudController<\/code>). But if ArticlesController<\/code> handler methods were not defined, the GET \/articles?create<\/code> request would have been handled by the RepositoryCrudController<\/code>.<\/p>\n

With this simple fall-back<\/em> controller that has the default<\/em> behavior, developers (team mates) can then focus on the domain, creating views, or creating controllers with custom behavior (e.g. Ajax, Server-generated JavaScript Responses).<\/p>\n

That’s all for now.<\/p>\n

\n\n\n\n
\n

Published on Java Code Geeks with permission by Lorenzo Dee, partner at our JCG program<\/a>. See the original article here: Reduce Repetitive Code in Spring MVC Controllers<\/a><\/p>\n

Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

After spending some time doing sustained engineering (a.k.a. maintaining legacy code), I ventured to reduce repetitive code in Spring MVC @Controllers. I started with an abstract base controller class. 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