与RestTemplate基本身份验证 - 编译错误 - 构造HttpClient的（）是不可见(B

试图添加基本身份验证，以restTemplate

问题我遇到的是，我不能初始化：（既在代码段的进口）

HttpClient client = new HttpClient();

此代码解决了一个编译错误（不建议从Eclipse来解决这个问题）

1）是什么问题？

2）我是导入了错误的类？

我的代码片段：

import org.apache.http.client.HttpClient;
//OR (not together)
import sun.net.www.http.HttpClient;


HttpClient client = new HttpClient(); //this line dosent compile
UsernamePasswordCredentials credentials =
new UsernamePasswordCredentials("USERNAME","PASS");
client.getState().setCredentials(
  new AuthScope("www.example.com", 9090, AuthScope.ANY_REALM),
  credentials);
CommonsClientHttpRequestFactory commons =
     new CommonsClientHttpRequestFactory(client);

RestTemplate template = new RestTemplate(commons);
SomeObject result = template.getForObject(
     "http://www.example.com:9090/",SomeObject.class
 );

运行此得到异常：

> failed due to an unhandled exception: java.lang.Error: Unresolved
> compilation problems:     The constructor HttpClient() is not visible
>   The method getState() is undefined for the type HttpClient
>   CommonsClientHttpRequestFactory cannot be resolved to a type
>   CommonsClientHttpRequestFactory cannot be resolved to a type
>   SomeObject cannot be resolved to a type     The method
> getForObject(String, Class<SomeObject>, Object...) from the type
> RestTemplate refers to the missing type SomeObject    SomeObject cannot
> be resolved to a type

Answer 1:

到底它更容易使用运行基本身份验证：

restTemplate.exchange()

并不是

restTemplate.getForObject()

我的代码片段：

private HttpHeaders createHeaders(final String username, final String password ){
    HttpHeaders headers =  new HttpHeaders(){
          {
             String auth = username + ":" + password;
             byte[] encodedAuth = Base64.encodeBase64(
                auth.getBytes(Charset.forName("US-ASCII")) );
             String authHeader = "Basic " + new String( encodedAuth );
             set( "Authorization", authHeader );
          }
       };
       headers.add("Content-Type", "application/xml");
       headers.add("Accept", "application/xml");

       return headers;
}


    RestTemplate restTemplate = new RestTemplate();
    ResponseEntity<MyClass> response;
    httpHeaders = this.createHeaders("user", "pass");

    String url = "www.example.com"
    response = restTemplate.exchange(url, HttpMethod.GET, new HttpEntity<Object>(httpHeaders), MyClass.class);

和它的作品！

Answer 2:

如果您使用Apache HttpClient的，实例DefaultHttpClient ，因为HttpClient只是一个接口：

HttpClient httpclient = new DefaultHttpClient();

有关使用不同的身份验证方案与文档HttpClient 这里 。

Answer 3:

我们可以在下面的方式使用它在春季启动：

   @SpringBootApplication

公共类应用实现CommandLineRunner {

private static final Logger log = LoggerFactory.getLogger(Application.class);

public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
}

@Override
public void run(String... args) throws Exception {
    try{
    RestTemplate restTemplate = new RestTemplate();
    HttpHeaders httpHeaders = new HttpHeaders();
    httpHeaders = this.createHeaders();
    ResponseEntity<String> response;
    response  = restTemplate.exchange("<url>",HttpMethod.GET,new HttpEntity<Object>(httpHeaders),String.class);
    log.info(response.toString());
    }
    catch(Exception e)
    {
        System.out.println("Exception"+e);
    }


}

private HttpHeaders createHeaders(){
    HttpHeaders headers =  new HttpHeaders(){
          {            
             set( "Authorization", "3ee140");
          }
       };

       return headers;
}

}

文章来源: Basic Authentication with RestTemplate - compilation error - The constructor HttpClient() is not visible