RestTemplate使用指南

首先，要對restTemplate進行配置：

@Configuration
public class Config {

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

}

具體使用：
@Autowired
private RestTemplate restTemplate;

    @Test
    public void regist() {

        try {
            String base64_auth_string = new BASE64Encoder().encode("150da48c337a17a64f7b9939:1b24897a66a43afd9364c4fd".getBytes());
            System.out.println(base64_auth_string);
            HttpHeaders headers = new HttpHeaders();
            headers.add("Authorization","Basic "+ base64_auth_string.trim());
            headers.add("Content-Type", "application/json");
            JSONArray jsonArray = new JSONArray();
            JSONObject jsonObject = new JSONObject();
            try {
                jsonObject.put("username", "zhuangrui");
                jsonObject.put("password", "123456");
            } catch (JSONException e) {
                e.printStackTrace();
            }
            jsonArray.put(jsonObject);
            HttpEntity<String> formEntity = new HttpEntity<String>(jsonArray.toString(), headers);
            String data = restTemplate.postForObject("https://api.im.jpush.cn/v1/users/", formEntity, String.class);
            System.out.println(data);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }