类型List不是通用的; 它不能用参数[HTTPClient]参数化

Question

import java.awt.List;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.InputStreamReader;
import java.util.ArrayList;

import javax.imageio.ImageIO;

import org.apache.commons.codec.binary.Base64;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.omg.DynamicAny.NameValuePair;

public class Upload {

    public static void main (String[] args) {

        System.out.println(Imgur("C:\\Users\\username\\Desktop\\image.jpg",     "clientID"));
    }

public static String Imgur (String imageDir, String clientID) {
    //create needed strings
    String address = "https://api.imgur.com/3/image";

    //Create HTTPClient and post
    HttpClient client = new DefaultHttpClient();
    HttpPost post = new HttpPost(address);

    //create base64 image
    BufferedImage image = null;
    File file = new File(imageDir);

    try {
        //read image
        image = ImageIO.read(file);
        ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
        ImageIO.write(image, "png", byteArray);
        byte[] byteImage = byteArray.toByteArray();
        String dataImage = new Base64().encodeAsString(byteImage);

        //add header
        post.addHeader("Authorization", "Client-ID" + clientID);
        //add image
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
        nameValuePairs.add(new BasicNameValuePair("image", dataImage));
        post.setEntity(new UrlEncodedFormEntity(nameValuePairs));

        //execute
        HttpResponse response = client.execute(post);

        //read response
        BufferedReader rd = new BufferedReader(new         InputStreamReader(response.getEntity().getContent()));
        String all = null;

        //loop through response
        while (rd.readLine() != null) {
            all = all + " : " + rd.readLine(); 
        }

        return all;

    }
    catch (Exception e){
        return "error: " + e.toString();
    }
}
}

所以我有那个代码,我从使用Java https错误上传到Imgur v3得到它,我在第50行收到"List"错误告诉我

类型List不是通用的; 它不能用参数参数化

我该怎么做才能解决这个问题？

我正在使用http://hc.apache.org/httpclient-3.x/并希望使用他们的v3 API将图像上传到imgur.

编辑:更改导入后,我现在得到这些错误.

这解决了这个问题,但又给了我两个错误.

nameValuePairs.add(new BasicNameValuePair("image", dataImage));

类型List中的方法add(NameValuePair)不适用于参数(BasicNameValuePair)

和

post.setEntity(new UrlEncodedFormEntity(nameValuePairs));

构造函数UrlEncodedFormEntity(List)未定义

Answer 1

您的导入有一个微妙的错误:

import java.awt.List;

它应该是:

import java.util.List;

问题是awtJava和util的两个包都提供了一个名为的类List.前者是显示元素,后者是与集合一起使用的泛型类型.此外,java.util.ArrayList延伸java.util.List,如果不是泛型,则不是 java.awt.List这样,它仍然是一个问题.

编辑:(解决由OP给出进一步的问题)作为回答您的评论,似乎有花药微妙的进口问题.

import org.omg.DynamicAny.NameValuePair;

应该

import org.apache.http.NameValuePair

nameValuePairs现在使用正确的泛型类型参数,为通用的说法new UrlEncodedFormEntity,这就是List<? extends NameValuePair>,变成有效的,因为你的NameValuePair现在一样他们的NameValuePair.以前,org.omg.DynamicAny.NameValuePair没有扩展org.apache.http.NameValuePair和缩短的类型名称在您的文件中NameValuePair评估org.omg...,但org.apache...在他们的代码中.

Answer 2

尝试导入

java.util.List;

代替

java.awt.List;