RestTemplate使用之如何設(shè)置請(qǐng)求頭、請(qǐng)求體

更新時(shí)間：2023年07月06日 10:46:19 作者：Hello_xzy_Word

這篇文章主要介紹了RestTemplate使用之如何設(shè)置請(qǐng)求頭、請(qǐng)求體問題，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

RestTemplate使用:設(shè)置請(qǐng)求頭、請(qǐng)求體

HttpEntity ?

使用 RestTemplate 時(shí)可以通過 HttpEntity 設(shè)置請(qǐng)求頭和請(qǐng)求體。HttpEntity 有4個(gè)構(gòu)造方法：

既不設(shè)置請(qǐng)求體，也不設(shè)置請(qǐng)求頭
只設(shè)置請(qǐng)求體
只設(shè)置請(qǐng)求頭
同時(shí)設(shè)置請(qǐng)求體和請(qǐng)求頭

HttpEntity 源碼：

/**
?* Create a new, empty {@code HttpEntity}.
?*/
protected HttpEntity() {
? this(null, null);
}
/**
?* Create a new {@code HttpEntity} with the given body and no headers.
?* @param body the entity body
?*/
public HttpEntity(T body) { // 只設(shè)置請(qǐng)求體
? this(body, null);
}
/**
?* Create a new {@code HttpEntity} with the given headers and no body.
?* @param headers the entity headers
?*/
public HttpEntity(MultiValueMap<String, String> headers) { // 只設(shè)置請(qǐng)求頭
? this(null, headers);
}
/**
?* Create a new {@code HttpEntity} with the given body and headers.
?* @param body the entity body
?* @param headers the entity headers
?*/
public HttpEntity(T body, MultiValueMap<String, String> headers) { // 同時(shí)設(shè)置請(qǐng)求體與請(qǐng)求頭
? this.body = body;
? HttpHeaders tempHeaders = new HttpHeaders();
? if (headers != null) {
? ? ? tempHeaders.putAll(headers);
? }
? this.headers = HttpHeaders.readOnlyHttpHeaders(tempHeaders);
}

1、為 post、put 請(qǐng)求設(shè)置請(qǐng)求頭、請(qǐng)求體

如果是為 post、put 請(qǐng)求設(shè)置請(qǐng)求頭、請(qǐng)求體，可以在調(diào)用方法時(shí)，利用第二個(gè)參數(shù)傳入 HttpEntity 對(duì)象，例如：

HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.set("MyRequestHeader", "MyValue");
HttpEntity requestEntity = new HttpEntity(requestHeaders);
Book book = restTemplate.postForObject("http://127.0.0.1:8080/getbook", requestEntity, Book.class);

PS：public class HttpHeaders implements MultiValueMap<String, String>, Serializable

同時(shí)設(shè)置請(qǐng)求頭和請(qǐng)求體：

? ? @PostMapping("post_with_body_and_header")
? ? public void postWithBodyAndHeader(@RequestBody(required = false) UserEntity requestBody) {
? ? ? ? // 1.請(qǐng)求頭
? ? ? ? HttpHeaders httpHeaders = new HttpHeaders();
? ? ? ? httpHeaders.add("headerName1", "headerValue1");
? ? ? ? httpHeaders.add("headerName2", "headerValue2");
? ? ? ? httpHeaders.add("headerName3", "headerValue3");
? ? ? ? httpHeaders.add("Content-Type", "application/json"); // 傳遞請(qǐng)求體時(shí)必須設(shè)置
? ? ? ? // 2.請(qǐng)求頭 & 請(qǐng)求體
? ? ? ? HttpEntity<String> fromEntity = new HttpEntity<>(JSONUtil.toJsonStr(requestBody), httpHeaders);
? ? ? ? MessageBox responseBody = restTemplate.postForObject(INVOKE_URL + "/test/receive", fromEntity, MessageBox.class);
? ? ? ? log.info("響應(yīng)體：{}", JSONUtil.toJsonPrettyStr(responseBody));
? ? }

2、為其他請(qǐng)求設(shè)置請(qǐng)求頭、請(qǐng)求體

如果是其它HTTP方法調(diào)用要設(shè)置請(qǐng)求頭，可以使用exchange()方法：

HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.set("MyRequestHeader", "MyValue");
HttpEntity requestEntity = new HttpEntity(requestHeaders);
HttpEntity<String> response = template.exchange(
? ? ? ? "http://example.com/hotels/{hotel}",
? ? ? ? HttpMethod.GET,?
? ? ? ? requestEntity,?
? ? ? ? String.class,?
? ? ? ? "42"
? ? );
String responseHeader = response.getHeaders().getFirst("MyResponseHeader");
String body = response.getBody();

RestTemplate添加請(qǐng)求頭

//請(qǐng)求添加token頭
HttpHeaders headers = new HttpHeaders();
headers.add("token",token);
HttpEntity<String> requestEntity = new HttpEntity<>(null, headers);
ResponseEntity<String> resEntity = restTemplate.exchange(url.toString(), HttpMethod.GET, requestEntity, String.class);
//請(qǐng)求結(jié)果
String str = resEntity.getBody();