SpringBoot-RestTemplate

女爷i 2022-05-21 03:42 238阅读 0赞

*   *  摘要
     *  使用
        
         *  GET请求
            
             *  1 获取对象
             *  2 获取数组
             *  3 GET请求带有参数
             *  4 请求文件
         *  POST请求
            
             *  1 请求携带cookie
             *  2 模拟提交表单
             *  3 模拟提交json
             *  4 通过URL提交POST请求

## 摘要 ##

SpringBoot提供RestTemplate作为Rest请求访问的客户端

## 使用 ##

### GET请求 ###

#### 1 获取对象 ####

public User findById(Long id){
        return restTemplate.getForObject("http://localhost:8080/"+id,User.class)
    }

#### 2 获取数组 ####

public List<User> getUsers(){
        return Arrays.asList(restTemplate.getForObject("http://localhost:8080/list".User[].class));
    }

#### 3 GET请求带有参数 ####

public User[] find(String name,int age){
        Map<String,Object> param = Maps.newHashMap();
        param.put("name",name);
        param.put("age",age);
        return restTemplate.getForObject(
            "http://localhost:8080/serach?name={name}&age={age}",
            User[].class,
            param)
    }

#### 4 请求文件 ####

String url = "";
    HttpHeaders headers = new HttpHeaders();
    headers.setAccept(Lists.newArrayList(MediaType.APPLICATION_OCTET_STREAM));
    HttpEntity<String> request = new HttpEntity<>(headers);
    ResponseEntity<byte[]> response = restTemplate.exchange(url, HttpMethod.GET, request, byte[].class);
    byte[] bytes = response.getBody();

### POST请求 ###

#### 1 请求携带cookie ####

String url= "";
    HttpHeaders headers = new HttpHeaders();
    List<String> cookies = new ArrayList<>();
    cookies.add("mycookie=mycookie");
    headers.put(HttpHeaders.COOKIE, cookies);
    HttpEntity request = new HttpEntity(null, headers);
    ResponseEntity<String> response = restTemplate.postForEntity(url, request, String.class);

#### 2 模拟提交表单 ####

String url = "";
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
    MultiValueMap<String, String> form = new LinkedMultiValueMap<>();
    form.add("username", "admin");
    form.add("password", "admin");
    HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(form, headers);
    ResponseEntity<String> response = restTemplate.postForEntity(url, request, String.class);

#### 3 模拟提交json ####

String url = "";
    String json = "";
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);
    headers.setAccept(Lists.newArrayList(MediaType.APPLICATION_JSON));
    HttpEntity<String> request = new HttpEntity<>(json, headers);
    ResponseEntity<String> response = restTemplate.postForEntity(url, request, String.class);

#### 4 通过URL提交POST请求 ####

String url = "http://localhost:8080/login?username={0}&password={1}";
    url = MessageFormat.format(url, "admin", "admin");
    restTemplate.postForEntity(url, null, String.class);

SpringBoot-RestTemplate

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