找不到类"org.apache.http.entity.mime.content.Filebody"，从方法引用

Question

我想做的是发送一张图片到web服务器。当我在我的Android项目中调用一个方法时，我得到以下错误:找不到类'org.apache.http.entity.mime.content。Filebody'，从方法com.example.tc.Send.send.

即使我有以下导入，也会发生这种情况:

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.DefaultHttpClient;

方法所在的类是这样的:

public class Send {
public Send(){
}
public static String send(String path) throws Exception {
    String filePath = path;
    String svar;
    HttpClient httpclient = new DefaultHttpClient();
    try {
        HttpPost httppost = new HttpPost("path to web server"); 
        FileBody pic = new FileBody(new File(filePath)); 
        MultipartEntity requestEntity = new MultipartEntity(); 
        requestEntity.addPart("file", pic);
        httppost.setEntity(requestEntity);
        System.out.println("executing request " + httppost.getRequestLine());
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity responseEntity = response.getEntity();
        System.out.println("----------------------------------------");
        System.out.println(response.getStatusLine());
        ByteArrayOutputStream outstream = new ByteArrayOutputStream();
        response.getEntity().writeTo(outstream);
        byte [] responseBody = outstream.toByteArray();
        svar = new String(responseBody);
        System.out.println(svar);
    } finally {
        try {
            httpclient.getConnectionManager().shutdown();
        } 
        catch (Exception ignore) {
        }
    }
    return svar;
}
}

谁能看出问题是什么吗?

Answer 1

添加这两个依赖

compile "org.apache.httpcomponents:httpcore:4.2.4"
compile "org.apache.httpcomponents:httpmime:4.3"

Answer 2

在类路径中需要有httpmime-4.0.jar。你可能(我猜你做)有这个jar到你的项目，但它是在运行时你的应用程序内?如果我理解正确的话，你可以从android应用程序中得到这个。你需要把这个jar放到android的类路径中。

Answer 3

• 添加依赖项:

  <>之前编译的org.apache.httpcomponents: httpcore: 4.4.4"

Answer 4

从此链接http://hc.apache.org/downloads.cgi下载Apache HttpComponents jar文件，并在Android项目目录中创建一个/libs目录，并将jar文件复制到该目录中。点击Android项目的项目属性，然后选择Java Build Path settings，选择Libraries选项卡，点击add JAR按钮，选择/libs目录下的JAR，将其添加到项目中。

Answer 5

您还可以从Eclipse ADT包中获取这些文件，而不必单独下载它们—请参阅这里的答案:

https://stackoverflow.com/a/27906193/334402

请注意，您将获得原始海报标记的错误，即"找不到类"。Filebody'，如果您只是将外部JAR文件添加到构建路径中，但忘记将归档文件也导入到项目中。