Spring RESTful Routing & Static Files

RequestMapping Basics

Requisting mapping doen by the following methods

RequestMapping — by Path

Syntax

@RequestMapping(value = "/ex/foos", method = RequestMethod.GET)
@ResponseBody
public String getFoosBySimplePath() {
    return "Get some Foos";
}

To test out this mapping with a simple curl command, run:

curl -i http://localhost:8080/spring-rest/ex/foos

RequestMapping — the HTTP Method

Note: The HTTP method parameter has no default. So, if we don’t specify a value, it’s going to map to any HTTP request.

@RequestMapping(value = "/ex/foos", method = POST)
@ResponseBody
public String postFoos() {
    return "Post some Foos";
}

To test the POST via a curl command:

curl -i -X POST http://localhost:8080/spring-rest/ex/foos

RequestMapping and HTTP Headers

3.1 RequestMapping With the headers Attribute

@RequestMapping(value = "/ex/foos", headers = "key=val", method = GET)
@ResponseBody
public String getFoosWithHeader() {
    return "Get some Foos with Header";
}

To test the operation, we’re going to use the curl header support:

curl -i -H "key:val" http://localhost:8080/spring-rest/ex/foos

3.2 Consumes and Produces

Mapping media types produced by a controller method is worth special attention.

@RequestMapping(
  value = "/ex/foos", 
  method = GET, 
  headers = "Accept=application/json")
@ResponseBody
public String getFoosAsJsonFromBrowser() {
    return "Get some Foos with Header Old";
}

RequestMapping With Path Variables

4.1 Single @PathVariable

Syntax:

@RequestMapping(value = "/ex/foos/{id}", method = GET)
@ResponseBody
public String getFoosBySimplePathWithPathVariable(
  @PathVariable("id") long id) {
    return "Get a specific Foo with id=" + id;
}

This can be tested with curl:

curl http://localhost:8080/spring-rest/ex/foos/1

4.2 Multiple @PathVariable

Syntax:

@RequestMapping(value = "/ex/foos/{fooid}/bar/{barid}", method = GET)
@ResponseBody
public String getFoosBySimplePathWithPathVariables
  (@PathVariable long fooid, @PathVariable long barid) {
    return "Get a specific Bar with id=" + barid + 
      " from a Foo with id=" + fooid;

This is easily tested with a curl in the same way:

curl http://localhost:8080/spring-rest/ex/foos/1/bar/2

RequestMapping With Request Parameters
RequestMapping Corner Cases
New Request Mapping Shortcuts
Spring Configuration

Accessing Data with JPA

I will walks you through the process of building an application that uses Spring Data JPA to store and retrieve data in a relational database.

The link below will guide you to build you app

link

CrudRepository, JpaRepository, and PagingAndSortingRepository in Spring Data

Spring Data Repositories

Each of these defines its own functionality:

CrudRepository provides CRUD functions PagingAndSortingRepository provides methods to do pagination and sort records JpaRepository provides JPA related methods such as flushing the persistence context and delete records in a batch

CrudRepository

Notice the typical CRUD functionality:

save(…) – save an Iterable of entities. Here, we can pass multiple objects to save them in a batch findOne(…) – get a single entity based on passed primary key value findAll() – get an Iterable of all available entities in database count() – return the count of total entities in a table delete(…) – delete an entity based on the passed object exists(…) – verify if an entity exists based on the passed primary key value

PagingAndSortingRepository