feignclient @RequestMapping参数设置及请求头简易方式设置

一、Get请求：

参数为字符串：@RequestParam String param
如果为多个字符串参数：@RequestParam("id") String id, @RequestParam("name") String name
这里可能会想，直接用map不就完了？
举一个例子，如果调用的是第三方的接口，且为：/testServer/test4?id=xxx&name=xxxooo，
这样的方式该如何用feign的方式来调用呢？目前想到的就是用上面的方式即：test4的方式。
如果参数为Map集合或者自定义类，@RequestParam Map map 和字符串没什么区别，所以都用@RequestParam
@Requestparam和@pathvariable 的区别：
（1）、http://localhost:8080/test/login/{id}，用@pathvariable

@RequestMapping(value = "login/{id}",method = RequestMethod.GET)
public String login(@PathVariable("id") String id){}

@Pathvariable相当于给参数占位符一个别名，而且只有value值的形式

（2）、http://localhost:8080/test/login?id=xxx&name=xxoo，用@Requestparam

@RequestMapping(value = "login",method = RequestMethod.GET)
public String login(@RequestParam(value = "id",required = false) String id,@RequestParam(value = "name",required = false) String name){}

@RequestParam 的属性里面value、和name一样都是设置别名的，required是设置该参数是否必须要串入得属性，默认true。相当于参数里面是key=value的形式。

二、Post请求：

参数为字符串：String param，多个字符串参数都一致
参数为集合或者自定义类：@RequestBody Map map

另外@RequestMapping有params属性可以限制参数，是否为id必须等于1，或者name不能等于2的限制方式
@RequestMapping(value = "login",method = RequestMethod.GET,params = {"id=1","name!=2"})

三、请求头设置：@RequestHeader Map headerMap
这里只用这一种，因为没个调用接口的请求头不一致，所以这种场景可用度高。另外还有统一请求头的方式，主要用在请求头都格式固定的场景。

服务端代码：

@RestController
@RequestMapping("testSever")
public class ServerController {
    @RequestMapping(value = "/login", method = RequestMethod.POST)
    String login(String param) {
        return param;
    }

    @RequestMapping(value = "/testGet", method = RequestMethod.GET)
    String testGet(@RequestHeader Map map) {
        return null;
    }

    @RequestMapping(value = "/test2", method = RequestMethod.GET)
    String test2(String param) {
        return param;
    }

    @RequestMapping(value = "/test3", method = RequestMethod.POST)
    String test3(String param) {
        return null;
    }

    @RequestMapping(value = "/test4", method = RequestMethod.GET)
    byte[] test4() {
        return null;
    }

    @RequestMapping(value = "/test5", method = RequestMethod.GET)
    String test5(@RequestParam Map map) {
        return null;
    }

    @RequestMapping(value = "/test6", method = RequestMethod.POST)
    String test6(@RequestBody Map map) {
        return null;
    }

客户端feign代码：

@FeignClient(name = "testServer", url = "http://localhost:8899/testServer")
public interface TestRemoteApi {
    @RequestMapping(value = "/login", consumes = "application/json;charset=UTF-8", method = RequestMethod.POST)
    String login(String param);

    @RequestMapping(value = "/testGet", consumes = "application/json;charset=UTF-8", method = RequestMethod.GET)
    String testGet(@RequestHeader Map headerMap);

    @RequestMapping(value = "/test2", consumes = "application/json;charset=UTF-8", method = RequestMethod.GET)
    String test2(@RequestHeader Map headerMap, @RequestParam String param);

    @RequestMapping(value = "/test3", consumes = "application/json;charset=UTF-8", method = RequestMethod.POST)
    String test3(@RequestHeader Map headerMap, String param);

    @RequestMapping(value = "/test4", consumes = "application/json;charset=UTF-8", method = RequestMethod.GET)
    byte[] test4(@RequestParam("id") String id, @RequestParam("name") String name);

    @RequestMapping(value = "/test5", consumes = "application/json;charset=UTF-8", method = RequestMethod.GET)
    String test5(@RequestParam Map map);

    @RequestMapping(value = "/test6", consumes = "application/json;charset=UTF-8", method = RequestMethod.POST)
    String test6(@RequestBody Map map);
}

后续补充更多方式