如何使用Flickrj向Flickr发送简单的ping测试

Question

我试图使用flickrj向Flickr发送一个ping测试。我将一步一步地遵循这里的教程

https://github.com/callmeal/Flickr4Java

导入所有maven依赖项和所有内容，并以以下代码结束：

import java.util.Collections;

import com.flickr4java.flickr.Flickr;
import com.flickr4java.flickr.REST;
import com.flickr4java.flickr.collections.Collection;

import com.flickr4java.flickr.test.TestInterface;

public class hello {
    public static void main(String args[]){


    String apiKey = "3f7046fe0897516df587cc3e6226f878";
    String sharedSecret = "9d0ceef5f2f3040f";
    Flickr f = new Flickr(apiKey, sharedSecret, new REST());
    TestInterface testInterface = f.getTestInterface();
    Collection results = testInterface.echo(Collections.EMPTY_MAP);

    }
}

但是，我得到了以下错误：

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
    Type mismatch: cannot convert from Collection<Element> to Collection

    at hello.main(hello.java:18)

我做错了什么？

Answer 1

您可能在导入中有冲突，您使用的是com.flickr4java.flickr.collections.Collection，而您很可能--作为回声方法返回类型状态--希望使用java.util.Collection类。将这一行改为：

java.util.Collection<Element> results = testInterface.echo(Collections.EMPTY_MAP);

你的守则：

import java.util.Collections;

import com.flickr4java.flickr.Flickr;
import com.flickr4java.flickr.REST;
import com.flickr4java.flickr.collections.Collection;

import com.flickr4java.flickr.test.TestInterface;

public class hello {
    public static void main(String args[]){


    String apiKey = "3f7046fe0897516df587cc3e6226f878";
    String sharedSecret = "9d0ceef5f2f3040f";
    Flickr f = new Flickr(apiKey, sharedSecret, new REST());
    TestInterface testInterface = f.getTestInterface();
    java.util.Collection<Element> results = testInterface.echo(Collections.EMPTY_MAP);

    }
}

Answer 2

根据文档这里，您需要转换为

Collection<Element> results = testInterface.echo(Collections.EMPTY_MAP);

签名是..。

public Collection<Element> echo(Map<String, String> params) throws  FlickrException {
....
    return response.getPayloadCollection();
}