使用Apache Camel上传文件


从输出文件列表到将其上传到您自己的Web应用程序的备忘录。

在pom.xml中添加了camel-http4和httpmime。

pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>net.camel.client</groupId>
    <artifactId>camel-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
        <camel.version>2.13.2</camel.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-core</artifactId>
            <version>${camel.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.7</version>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>17.0</version>
        </dependency>
        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-http4</artifactId>
            <version>${camel.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>4.3.2</version>
        </dependency>
    </dependencies>
</project>

RouteBuilder扩展到另一个类。

MyRouteBuilder.java

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package net.camel.client.route;

import net.camel.client.processor.FileListProcessor;
import net.camel.client.processor.FileListToTsvStringProcessor;
import net.camel.client.processor.MultipartEntityProcessor;

import org.apache.camel.builder.RouteBuilder;

public class MyRouteBuilder extends RouteBuilder {

    @Override
    public void configure() throws Exception {
        // 指定ディレクトリ内のファイルの一覧を出力
        from("direct:report")
                .process(new FileListProcessor())
                .process(new FileListToTsvStringProcessor())
                .to("file:reports/?fileName=report.tsv");

        // ファイルをアップロード
        from("file:reports/?fileName=report.tsv")
                .process(new MultipartEntityProcessor())
                .to("http4:localhost:8080/upload");
    }
}

当文件存储在Exchange正文中时，

camel-http4似乎自动发出了上传请求，但是它没有用，所以我创建了自己的Processor来制作MultipartEntity。

MultipartEntityProcessor.java

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package net.camel.client.processor;

import java.io.File;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;

public class MultipartEntityProcessor implements Processor {

    @Override
    public void process(Exchange exchange) throws Exception {
        File file = exchange.getIn().getBody(File.class);
        FileBody fileBody = new FileBody(file);
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
        builder.addPart("file", fileBody);
        exchange.getIn().setBody(builder.build());
    }

}