SpringBoot2中使用@RequestHeader获取请求头的方法

springMVC/SpringBoot中提供了@RequestHeader注解用来获取请求头。

一、使用@RequestHeader获取请求头

（一）获取某一个请求头

例如，获取accept-language请求头：

@GetMapping("/getLanguage")
public Result test(@RequestHeader("accept-language") String language) {
    // ......
    
    return new Result(true, 600, language);
}

使用postman，没有设置accept-language请求头时，响应：

{
    "timestamp": "2019-12-3T20:43:58.971+0000",
    "status": 400,
    "error": "Bad Request",
    "message": "Missing request header 'accept-language' for method parameter of type String",
    "path": "/getLanguage"
}

添加了accept-language请求头后，响应：

{
    "flag": true,
    "code": 600,
    "message": "en-US,en;q=0.9,zh-CN;q=0.8,zh;q=0.7"
} 

（二）获取数值型请求头

@GetMapping("/num")
public Result getNumber(@RequestHeader("my-number") int myNumber) {
    return new Result(true, HttpStatus.OK.value(), String.valueOf(myNumber));
}

使用postman设置my-number请求头值为1，响应：

{
    "flag": true,
    "code": 200,
    "message": "1"
}

（三）一次性获取所有请求头

1、使用Map接收所有请求头

@GetMapping("/getHeaders")
public Result listAllHeaders(@RequestHeader Map<String, String> headers) {
    headers.forEach((key, value) -> {
        // 日志中输出所有请求头
        logger.info(String.format("Header '%s' = %s", key, value));
    });
    return new Result(true, HttpStatus.OK.value(), "");
}

使用postman请求该地址，控制台打印：

2019-12-03 21:10:35,993 INFO  [http-nio-10000-exec-9] com.chushiyan.test.controller.HttpHeaderController:

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Header ‘user-agent’ = PostmanRuntime/7.20.1
2019-12-03 21:10:35,994 INFO  [http-nio-10000-exec-9] com.chushiyan.test.controller.HttpHeaderController: Header ‘accept’ = */*
2019-12-03 21:10:35,994 INFO  [http-nio-10000-exec-9] com.chushiyan.test.controller.HttpHeaderController: Header ‘cache-control’ = no-cache
2019-12-03 21:10:35,995 INFO  [http-nio-10000-exec-9] com.chushiyan.test.controller.HttpHeaderController: Header ‘postman-token’ = 47dce6dd-c082-47b0-8867-720e45205aa1
2019-12-03 21:10:35,995 INFO  [http-nio-10000-exec-9] com.chushiyan.test.controller.HttpHeaderController: Header ‘host’ = localhost:10000
2019-12-03 21:10:35,995 INFO  [http-nio-10000-exec-9] com.chushiyan.test.controller.HttpHeaderController: Header ‘accept-encoding’ = gzip, deflate
2019-12-03 21:10:35,996 INFO  [http-nio-10000-exec-9] com.chushiyan.test.controller.HttpHeaderController: Header ‘connection’ = keep-alive

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