resttemplate远程get调用 resttemplate get body

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梦断蓝桥魂 2024-07-25 09:39:11

文章标签 resttemplate远程get调用 http 网络协议 java 请求头 文章分类 云原生云计算

一、RestTemplate 不同方法的调用示例 GET方法，POST方法

2.1 RestTemplate GET请求示例代码

2.2 RestTemplate POST请求示例代码

2.3 RestTemplate Post 通过form提交数据，代码实例

二、RestTemplate 请求参数设置的几种方式

1. URL Path 中携带参数

2. ResponseBody中传递参数，JSON对象传递参数

3. FORM 表单提交参数

http 客户端的工具越来越多，每次使用的时候又各有特点，所以在这里总结下各个http 客户端工具的使用，java代码如下。

常见的http客户端工具有这些：httpClient， okHttp， RestTemplate，jesryClient

【Http客户端】Http客户端-RestTemplate的使用实例代码

今天我们说说 RestTemplate工具

1. 构建一个RestTemplate 的单例bean

当然你也可以直接在方法内部每次使用的时候 new 一个RestTemplate对象。

比如 RestTemplate restTemplate = new RestTemplate(); 也是可以的

@Configuration
public class RestTemplateConfig {

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

    @Bean
    public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
        SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
        factory.setConnectTimeout(3000);
        factory.setReadTimeout(30000);
        return factory;
    }
}

2. 使用RestTemplate

一、RestTemplate 不同方法的调用示例 GET方法，POST方法

2.1 RestTemplate GET请求示例代码

header参数的设置

requestParameter参数的设置

response数据的解析

void testSendGetHttp() {
        // http请求模板
        RestTemplate restTemplate = new RestTemplate();

        // 设置请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("clientId", "123123");
        headers.add("secret", "321321");

        // url
        String url = "https://example.com/user";

        // get请求构造url
        UriComponentsBuilder builder = UriComponentsBuilder.fromUriString(url)
                .queryParam("username", "张三")
                .queryParam("email", "");
        String path = builder.build().toUri().toString();
        log.info("path: {}", path);  // 输出https://example.com/user?username=张三&email=
        // 封装http实体
        HttpEntity<String> entity = new HttpEntity<>(headers);

        // 发送请求
        ResponseEntity<String> response = restTemplate.exchange(path, HttpMethod.GET, entity, String.class);
        log.info("response body: {}", response.getBody());

    }

// response 返回值这里用了泛型

private void getDemo(){
  // 设置请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", "bearer " + accessToken);

        // get请求构造url
        UriComponentsBuilder builder = UriComponentsBuilder.fromUriString(AccountConstants.URL_ACCOUNT_GET_USERINFO_BY_TOKEN);
        builder.build("gg");
        builder.queryParam("a",1);
        builder.queryParam("b","abc");
        builder.queryParam("c","x,y,z");
        String path = builder.build().toUri().toString();
        log.info("path: {}", path);

        HttpEntity<String> httpEntity = new HttpEntity<>(headers);

        ParameterizedTypeReference<RestDataResponse<UserInfo>> typeRef = new ParameterizedTypeReference<RestDataResponse<UserInfo>>() {};

        ResponseEntity<RestDataResponse<UserInfo>> response = restTemplate.exchange(path,
                HttpMethod.GET, httpEntity, typeRef);

        if (response.getStatusCode() == HttpStatus.OK) {
            // .... 
        }

}

2.2 RestTemplate POST请求示例代码

header参数的设置

requestBody参数的设置

response数据的解析

@Override
    public boolean registerAccount1(String username, String password, String captcha) {
        // 设置请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", Base64Utils.createBasicHeader(appKey, appSecret));
        log.info(" Authorization: {}", headers.get("Authorization").toString());

        // 请求参数，一个list里面装着map
        List<Map<String, Object>> list = new ArrayList<>();
        Map<String, Object> departmentUserMap = new HashMap<>();
        departmentUserMap.put("department", "[\"testDepartment\"]");
        departmentUserMap.put("post", "管理员");
        departmentUserMap.put("recursive", "true");
        list.add(departmentUserMap);

        // 封装http实体
        HttpEntity<List<Map<String, Object>>> httpEntity = new HttpEntity<>(list, headers);

        // 发送请求
        ResponseEntity<Map> response = restTemplate.exchange(AccountConstants.URL_ACCOUNT_POST_REGISTER, HttpMethod.POST,
                httpEntity, Map.class);

        log.info("response body: {}", response.getBody());

        return false;
    }


    @Override
    public boolean registerAccount2(String username, String password, String captcha) {
        // 设置请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", Base64Utils.createBasicHeader(appKey, appSecret));
        log.info(" Authorization: {}", headers.get("Authorization").toString());

        // 请求参数，一个list里面装着map
        Map<String, Object> registerMap = new HashMap<>();
        registerMap.put("identity", username);
        registerMap.put("password", password);
        registerMap.put("captcha", captcha);

        // 封装http实体
        HttpEntity<Map<String, Object>> httpEntity = new HttpEntity<>(registerMap, headers);

        ParameterizedTypeReference<RestDataResponse<RegisterResponse>> typeRef = new ParameterizedTypeReference<RestDataResponse<RegisterResponse>>() {
        };

        // 发送请求
        ResponseEntity<RestDataResponse<RegisterResponse>> response = restTemplate.exchange(AccountConstants.URL_ACCOUNT_POST_REGISTER, HttpMethod.POST,
                httpEntity, typeRef);

        log.info("response body: {}", response.getBody());

        return false;
    }

2.3 RestTemplate Post 通过form提交数据，代码实例

/**
     * oauth2 登录： 获取token+同时获取用户信息
     * @param username
     * @param password
     * @return
     */
    @Override
    public OAuth2LoginResponse oauth2Login(String username, String password) {
        // 设置请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", Base64Utils.createBasicHeader(appKey, appSecret));
        // headers.add("Content-type", "application/x-www-form-urlencoded");
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

        //  封装参数，千万不要替换为Map与HashMap，否则参数无法传递
        MultiValueMap<String, String> params= new LinkedMultiValueMap<String, String>();
        params.add("grant_type", "password");
        params.add("username", username);
        params.add("password", password);

        HttpEntity<MultiValueMap<String, String>> httpEntity = new HttpEntity<MultiValueMap<String, String>>(params, headers);

        restTemplate.exchange(AccountConstants.URL_ACCOUNT_POST_OAUTH2_LOGIN, HttpMethod.POST, httpEntity, String.class);

        ParameterizedTypeReference<RestDataResponse<OAuth2LoginResponse>> typeRef =
                new ParameterizedTypeReference<RestDataResponse<OAuth2LoginResponse>>() {};
        // 发送请求
        ResponseEntity<RestDataResponse<OAuth2LoginResponse>> response = restTemplate.exchange(AccountConstants.URL_ACCOUNT_POST_OAUTH2_LOGIN,
                HttpMethod.POST,
                httpEntity, typeRef);

        log.info("response body: {}", response.getBody());
        if (response.getStatusCode() == HttpStatus.OK) {
            RestDataResponse<OAuth2LoginResponse> body = response.getBody();
            if (body != null && Objects.equals(body.getCode(), 0)) {
                return body.getData();
            }
            String bodystr = JSON.toJSONString(body);

            log.warn("rest response code:{}, message:{}, \r\n resp body:{}", body.getCode(), body.getMessage(), JSON.toJSONString(body));
            log.error(" 登录接口调用失败: username:{}, password:{} ", username, password);
            throw new ServiceException(body.getMessage());
        }else {
            log.error(" 登录接口调用失败: username:{}, password:{} ", username, password);
            throw new ServiceException("登录接口调用失败");
        }
    }

二、RestTemplate 请求参数设置的几种方式

1. URL Path 中携带参数

不管是GET方法还是POST方法都可以通过这种方式，在url中携带参数

如： https://www.baidu.com?a=1&b=123&c=1,2,3

// response 返回值这里用了泛型

private void getDemo(){
  // 设置请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", "bearer " + accessToken);

        // get请求构造url
        UriComponentsBuilder builder = UriComponentsBuilder.fromUriString(AccountConstants.URL_ACCOUNT_GET_USERINFO_BY_TOKEN);
        builder.build("gg");
        builder.queryParam("a",1);
        builder.queryParam("b","abc");
        builder.queryParam("c","x,y,z");
        String path = builder.build().toUri().toString();
        log.info("path: {}", path);

        HttpEntity<String> httpEntity = new HttpEntity<>(headers);

        ParameterizedTypeReference<RestDataResponse<UserInfo>> typeRef = new ParameterizedTypeReference<RestDataResponse<UserInfo>>() {};

        ResponseEntity<RestDataResponse<UserInfo>> response = restTemplate.exchange(path,
                HttpMethod.GET, httpEntity, typeRef);

        if (response.getStatusCode() == HttpStatus.OK) {
            // .... 
        }

}

2. ResponseBody中传递参数，JSON对象传递参数

ResponseBody中传递参数，服务端有个对象来接受这个参数，传输的是一个json对象

// 2. ResponseBody中传递参数，服务端有个对象来接受这个参数

private void fun1(){

 // 设置请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", Base64Utils.createBasicHeader(appKey, appSecret));
        log.info(" Authorization: {}", headers.get("Authorization").toString());

        Map<String, Object> registerMap = new HashMap<>();
        registerMap.put("identity", username);
        registerMap.put("password", password);
        registerMap.put("captcha", captcha);
        HttpEntity<Map<String, Object>> httpEntity = new HttpEntity<>(registerMap, headers);
        ParameterizedTypeReference<RestDataResponse<RegisterResponse>> typeRef = new ParameterizedTypeReference<RestDataResponse<RegisterResponse>>() {};

        // 发送请求
        ResponseEntity<RestDataResponse<RegisterResponse>> response = restTemplate.exchange(AccountConstants.URL_ACCOUNT_POST_REGISTER,
                HttpMethod.POST, httpEntity, typeRef);

}


// 服务端接受参数的对象是这样的：

@Data
public class RegisterRequest(){
    private String username;
    private String password;
    private String captcha;

}

3. FORM 表单提交参数

form表单提交数据也非常常见，类似页面form提交数据的方式

// form 提交数据

private void fun2(){

 // 设置请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", Base64Utils.createBasicHeader(appKey, appSecret));
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

        MultiValueMap<String, String> params= new LinkedMultiValueMap<String, String>();
        params.add("token", accessToken);
        params.add("time", "2023-08-22");

        // 封装http实体
        HttpEntity<MultiValueMap<String, String>> httpEntity = new HttpEntity<MultiValueMap<String, String>>(params, headers);
        ParameterizedTypeReference<RestDataResponse<CheckTokenResponse>> typeRef =
                new ParameterizedTypeReference<RestDataResponse<CheckTokenResponse>>() {};

        // 发送请求
        ResponseEntity<RestDataResponse<CheckTokenResponse>> response = restTemplate.exchange(AccountConstants.URL_ACCOUNT_POST_CHECK_TOKEN,
                HttpMethod.POST,
                httpEntity, typeRef);

        if (response.getStatusCode() == HttpStatus.OK) { 

            //...
        }
}

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