Apache Camel 、Springboot 实现文件传输

在实际开发过程中，我们经常需要将某台服务器的文件自动上传到另外一台服务器。这时我们就需要一个文件自动上传工具，Apache Camel就很好的实现这个功能。

1.创建一个Spring Boot项目

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选择依赖jar包：添加camel及web的依赖

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确定创建项目信息

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2.在POM文件中添加其他依赖

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.4.3
         
    
    com.liwei
    camel-file
    0.0.1-SNAPSHOT
    camel-file
    Demo project for Spring Boot
    
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.apache.camel
            camel-spring-boot-starter
            2.23.2
        
        
            org.apache.httpcomponents
            httpcore
            4.4.9
        
        
            org.apache.camel
            camel-http4
            2.23.2
        
        
            org.apache.httpcomponents
            httpmime
            4.5.5
        
        
            commons-io
            commons-io
            2.5
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

3.application.yml配置

file.from: file:E:/from/?recursive=true  #源文件地址,recursive参数是递归from文件夹，具体参数见http://camel.apache.org/file2
file.to: E:/to/ #需要写入的目录
file.upload: http4://127.0.0.1:8080/upload #上传文件的接口

4.设置文件夹监听

设置文件夹监听，当文件夹有新增文件时，会自动触发上传。from为需要上传的文件夹目录，本实例为file:E:/from/?recursive=true，recursive参数的意思是：查找子目录的文件，若为false，则只上传当前目录的文件，如有其他要求，可查询http://camel.apache.org/file2

package com.liwei.camelfile;
import org.apache.camel.Exchange;
import org.apache.camel.builder.RouteBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class FileUploaderRoute extends RouteBuilder {
    @Autowired
    private CamelToolProcess camelToolProcess ;
    @Override
    public void configure() {
        from("{{file.from}}")
                .process(camelToolProcess )
                .setHeader(Exchange.HTTP_METHOD, constant("POST"))
                .setHeader(Exchange.CONTENT_TYPE, constant("multipart/form-data"))
                .to("{{file.upload}}");
    }
}

5.文件处理CamelToolProcess

//构造HTTP请求文件上传格式
package com.liwei.camelfile;
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;
import org.springframework.stereotype.Component;
import java.io.File;
import static org.apache.http.entity.ContentType.MULTIPART_FORM_DATA;

@Component
public class CamelToolProcess implements Processor {
    @Override
    public void process(Exchange exchange) {

        MultipartEntityBuilder multipartEntityBuilder =
                MultipartEntityBuilder.create();
        multipartEntityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);

        String filename = (String)
                exchange.getIn().getHeader(Exchange.FILE_NAME);
        File file = exchange.getIn().getBody(File.class);
        multipartEntityBuilder.addPart("file",
                new FileBody(file, MULTIPART_FORM_DATA, filename));

        exchange.getIn().setBody(multipartEntityBuilder.build());
    }
}

6.上传文件接口

package com.liwei.camelfile.control;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;

@RestController
public class FileController {
    @Value("${file.to}")
    private String to;

    @PostMapping("/upload")
    @ResponseBody
    public void upload(@RequestParam("file") MultipartFile file) throws IOException {
        FileUtils.writeByteArrayToFile(new File(to + file.getOriginalFilename()), file.getBytes());
    }
}

7.测试

上传完成后会自动创建一个.camel文件，将上传成功的文件写入.camel目录中

image-20210314225336986.png

目标服务器的目录

image-20210314225508278.png