JAVA-000

Complex Controller

这是一个稍微复杂些的 Controller 的例子，演示了更多功能。

Project Setup

1. Spring Start io

2. pom.xml

    <dependency>
        <groupId>org.joda</groupId>
        <artifactId>joda-money</artifactId>
        <version>1.0.1</version>
    </dependency>
    <dependency>
        <groupId>org.jadira.usertype</groupId>
        <artifactId>usertype.core</artifactId>
        <version>7.0.0.CR1</version>
    </dependency>
   

3. application.properties, schema.sql, data.sql

Tool

如下工具可以帮助调试code，推荐使用 Postman。

• RestfulTool
  IDEA的一个plugin，可以在IDEA中发送简单的request，进行调试，但是功能有限。可以在 File > Settings > Plugins 中可以安装 RestfulTool 插件，也可以使用其它类似的 plugin，比如 Show REST Services.
• crul command line
• Postman (推荐)
  一个带有界面、功能强大的tool。文章中会大量使用 Postman 的截图进行调试和解释。

Knowledge

@RequestMapping 同时适用于 class 和 method

class 上的path，是所有 method 的prefix

@RequestMapping(method = ) = @GetMapping

@RestController = @Controller + @ResponseBody

@ResponseStatus(HttpStatus.CREATED)

Get Coffee by Name

Get Request: http://localhost:8080/coffee/?name=latte

@GetMapping(path = "/", params = "name")
@ResponseBody
public Coffee getByName(String name) {
    return coffeeService.getCoffee(name);
}

Get All Coffee

Get Request: http://localhost:8080/coffee/ @ResponseBody 代表结果将在 Response Body 中传回来。

@GetMapping(path = "/", params = "!name")
@ResponseBody
public List<Coffee> getAll() {
    return coffeeService.getAllCoffee();
}

Get Coffee by ID

** Get Request: http://localhost:8080/coffee/2 produces 对应Request Header**: Accept = application/json;charset=UTF-8 @PathVariable Long id 代表 id 从 Request Path 中获取。

@RequestMapping(path = "/{id}", method = RequestMethod.GET,
        produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
@ResponseBody
public Coffee getById(@PathVariable Long id) {
    Coffee coffee = coffeeService.getCoffee(id);
    return coffee;
}

Place an Order

** Post Request: http://localhost:8080/order/ consumes 对应Request Header: Content-Type = application/json produces 对应Request Header**: Accept = application/json;charset=UTF-8 @RequestBody NewOrderRequest newOrder 代表 order信息 从 Request Body 中获取。 @ResponseStatus(HttpStatus.CREATED) 表示正确返回的状态为 201，不再是默认的 200。 注意：CoffeeOrderController 上的 @RestController = @Controller + @ResponseBody，所以此 method 没有添加 @ResponseBody 注解。

@PostMapping(path = "/", consumes = MediaType.APPLICATION_JSON_VALUE,
        produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
@ResponseStatus(HttpStatus.CREATED)
public CoffeeOrder create(@RequestBody NewOrderRequest newOrder) {
    log.info("Receive new order: {}", newOrder);
    Coffee[] coffeeList = coffeeService.getCoffeeByName(newOrder.getItems())
            .toArray(new Coffee[]{});
    return orderService.createOrder(newOrder.getCustomer(), coffeeList);
}