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2021-03-18

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```java
pom依赖

<parent>
        <artifactId>spring-boot-starter-parent</artifactId>
        <groupId>org.springframework.boot</groupId>
        <version>2.0.1.RELEASE</version>
    </parent>

<dependencies>
        <dependency>
            <groupId>com.squareup.okhttp3</groupId>
            <artifactId>okhttp</artifactId>
            <version>3.8.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.30</version>
        </dependency>
</dependencies>

使用okhttp初始化restTemplate，启动类中添加

@Bean
    public RestTemplate restTemplate() {
        return new RestTemplate(new OkHttp3ClientHttpRequestFactory());
    }

测试接口
被restTemplate调用的接口

@PostMapping("/get/user")
    public User getUser(@RequestBody User user, HttpServletRequest request) {
        String token = request.getHeader("token");
        System.out.println(token);
        User newUser = new User();
        newUser.setId(110);
        newUser.setName("警察");
        BeanUtils.copyProperties(newUser, user, "desc", "note");
        return user;
    }

用到的实体类

@RestController
public class TestController {
    @Autowired
    private RestTemplate restTemplate;
    @RequestMapping("/test/restTemplate")
    public User testTemplate() {
        String url = "http://localhost:9999/get/user";
        User user = new User();
        user.setDesc("desc");
        user.setNote("note");
        // 方式一
        HttpHeaders headers = new HttpHeaders();
        MediaType type = MediaType.parseMediaType("application/json; charset=UTF-8");
        headers.setContentType(type);
        // 添加额外http请求头参数
        headers.add("token","123456");
        HttpEntity<String> request = new HttpEntity<String>(JSONObject.toJSON(user).toString(), headers);
        User u = restTemplate.postForObject(url, request, User.class);
        /*
        // 方式二 不需要传HttpHeaders的情况使用
        ResponseEntity<User> userResponseEntity = restTemplate.postForEntity(url, user, User.class);
        HttpStatus statusCode = userResponseEntity.getStatusCode();
        boolean xxSuccessful = statusCode.is2xxSuccessful();
        if(xxSuccessful){
            return userResponseEntity.getBody();
        }
        */
        return u;
    }
}
```

Springboot

RestTemplate 发送Post Json请求，并携带HttpHeaders

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