使用 Mailgun 发送电子邮件 - 未找到 Java 类型 FormDataMultiPart 和 MIME 媒体类型 application/x-www-form-urlencoded 的邮件正文编写器

Question

我正在尝试使用 Mailgun 和 Jersey 从 android 应用程序发送电子邮件。问题是当我 post 请求获得响应时，应用程序崩溃并出现错误：A message body writer for Java type, class com.sun.jersey.multipart.FormDataMultiPart, and MIME media type, application/x-www-form-urlencoded, was not found。我不确定为什么会这样。对此进行研究，建议您在创建客户端时添加 multipart class ，但这也不起作用。请注意，在这封电子邮件中，它只是纯文本，但我需要在应用程序中发送另一封可能包含附件的电子邮件 - 0 或更多图片。

java class:

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
import com.sun.jersey.api.client.filter.HTTPBasicAuthFilter;
import com.sun.jersey.multipart.FormDataMultiPart;
import com.sun.jersey.multipart.impl.MultiPartWriter;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

ClientConfig cc = new DefaultClientConfig();
cc.getClasses().add(MultiPartWriter.class);
Client theClient = Client.create(cc);
theClient.addFilter(new HTTPBasicAuthFilter("api", "my_api_key"));

final WebResource theWebResource = theClient.resource("https://api.mailgun.net/v3/"
                                                        + "mailgun_domain_key"
                                                        + "/messages");

final FormDataMultiPart message = new FormDataMultiPart();
message.field("from", "My App <donotreply@dnr.com>");
message.field("to", "email_recs");
message.field("subject", "subj");
message.field("text", "body_text");

ClientResponse response = theWebResource.type(MediaType.APPLICATION_FORM_URLENCODED).post(ClientResponse.class, message);
//app crashes after the above line is executed

build.gradle（模块）：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "com.x.x"
        minSdkVersion 14
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    packagingOptions{
        pickFirst 'META-INF/jersey-module-version'
        pickFirst 'META-INF/services/com.sun.jersey.spi.inject.InjectableProvider'
        pickFirst 'META-INF/services/javax.ws.rs.ext.MessageBodyReader'
        pickFirst 'META-INF/services/javax.ws.rs.ext.MessageBodyWriter'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'
    compile 'com.parse.bolts:bolts-android:1.+'
    compile fileTree(dir: 'libs', include: 'Parse-*.jar')
    compile files('libs/jersey-client-1.19.jar')
    compile files('libs/jersey-core-1.19.jar')
    compile files('libs/jersey-multipart-1.19.jar')
    compile files('libs/javax.ws.rs.jar')
    compile files('libs/jai_imageio-1.1.jar')
}

Answer 1

看看这个

theWebResource.type(MediaType.APPLICATION_FORM_URLENCODED)

您正在尝试 post 一个旨在用作多部分请求的对象，FormDataMultiPart，但您将 Content-Type 设置为 application/x-www-form-urlencoded .

您只需要将 Content-Type 更改为 multipart/form-data^[1] 或 MediaType.MULTIPART_FORM_DATA .

_{1.如API documentation}

中所述

使用 Mailgun 发送电子邮件 - 未找到 Java 类型 FormDataMultiPart 和 MIME 媒体类型 application/x-www-form-urlencoded 的邮件正文编写器

Sending email with Mailgun - a message body writer for Java type FormDataMultiPart and MIME media type application/x-www-form-urlencoded was not found

java

android

jersey

mailgun