SpringBoot

1. 简单示例

	//http://localhost:8080/   
	//requestBody:  {"people":{"name":"zhou","age":"123123"},"postCode":66666}
	//header:   Content-Type:application/json
	
	@RestController
	@EnableAutoConfiguration
	public class Example {

		@RequestMapping(value = "/", method = RequestMethod.POST)
		People home(@RequestBody RequestParam requestParam) {
			System.out.println(requestParam.getPostCode());
			System.out.println(requestParam.getPeople().getName());

			return new People();
		}

		public static void main(String[] args) throws Exception {
			SpringApplication.run(Example.class, args);
		}

	}

	class RequestParam {
		private int postCode;

		public int getPostCode() {
			return postCode;
		}

		public void setPostCode(int postCode) {
			this.postCode = postCode;
		}

		public People getPeople() {
			return people;
		}

		public void setPeople(People people) {
			this.people = people;
		}

		private People people;
	}

	class People {
		private String name;
		private int age;

		public String getName() {
			return name;
		}

		public void setName(String name) {
			this.name = name;
		}

		public int getAge() {
			return age;
		}

		public void setAge(int age) {
			this.age = age;
		}
	}

2. 相关注解

2.2 @RequestMapping

2.2.1 属性:value 指定请求的实际url

@Controller
@RequestMapping(value="/book")
public class BookController {
	@RequestMapping(value="/title")
	public String getTitle(){
		return "title";
	}           
	
	@RequestMapping(value="/content")
	public String getContent(){
		return "content";
	} 
} 

//@PathVariable注解即提取路径中的变量值
	@RequestMapping(value="/get/{bookId}")
	public String getBookById(@PathVariable String bookId,Model model){
		model.addAttribute("bookId", bookId);
		return "book";
	} 

(3)ant风格
	@RequestMapping(value="/get/id?")：可匹配“/get/id1”或“/get/ida”，但不匹配“/get/id”或“/get/idaa”;
	@RequestMapping(value="/get/id*")：可匹配“/get/idabc”或“/get/id”，但不匹配“/get/idabc/abc”;
	@RequestMapping(value="/get/id/*")：可匹配“/get/id/abc”，但不匹配“/get/idabc”;
	@RequestMapping(value="/get/id/**/{id}")：可匹配“/get/id/abc/abc/123”或“/get/id/123”，也就是Ant风格和URI模板变量风格可混用。
(4)含正则表达式的一类值
	@RequestMapping(value="/get/{idPre:\d+}-{idNum:\d+}")：可以匹配“/get/123-1”，但不能匹配“/get/abc-1”，这样可以设计更加严格的规则。
	可以通过@PathVariable 注解提取路径中的变量(idPre,idNum)
(5)或关系
	@RequestMapping(value={"/get","/fetch"} )即 /get或/fetch都会映射到该方法上	

2.2.2 属性：method 指定请求类型,GET/POST

@RequestMapping(value="/get/{bookid}",method={RequestMethod.GET,RequestMethod.POST})

2.2.3 属性:params 必须包含某些参数值是，才让该方法处理

@RequestMapping(params="action=del")，请求参数包含“action=del”,如：http://localhost:8080/book?action=del

2.2.4 属性：headers 必须匹配指定header值

@RequestMapping(value="/header/id", headers = "Accept=application/json")：表示请求的URL必须为“/header/id 且请求头中必须有“Accept =application/json”参数即可匹配。

2.2.5 属性: consumes 指定处理请求的提交内容类型（Content-Type），例如application/json, text/html

@RequestMapping(value = "/pets", method = RequestMethod.POST, consumes="application/json")

2.2.6 属性：produces 仅当request请求头中的(Accept)类型中包含该指定类型才返回

@RequestMapping(value = "/pets/{petId}", method = RequestMethod.GET, produces="application/json")

2.3 @RequestParam 解析获取单个请求参数值

	public String requestparam1(@RequestParam String username)	//请求中包含username参数（如/requestparam1?username=zhang），则自动传入。
	
	@RequestParam有以下三个参数：
		value：参数名字，即入参的请求参数名字，如username表示请求的参数区中的名字为username的参数的值将传入；
		required：是否必须，默认是true，表示请求中一定要有相应的参数，否则将抛出异常；
		defaultValue：默认值，表示如果请求中没有同名参数时的默认值，设置该参数时，自动将required设为false

2.4 @PathVariable 绑定URL模板变量值

@RequestMapping(value="/users/{userId}/topics/{topicId}")
public String test(
       @PathVariable(value="userId") int userId, 
       @PathVariable(value="topicId") int topicId)   

2.5 @RequestBody 将HTTP请求正文转换为适合的对象

2.6 @ResponseBody

该注解用于将Controller的方法返回的对象，通过适当的HttpMessageConverter转换为指定格式后，写入到Response对象的body数据区