将文件转换为文件流进行上传（例：通过HDMI进行传输）

package com.boottest.app;

import org.apache.commons.codec.Charsets;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.*;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

public class FileTest {

    public static void main(String[] args) throws Exception {
        String url ="http://localhost:8200/sys/uploadfile/uploadFile";
        InputStream inputStream=new FileInputStream("C:\\Users\\Administrator\\Desktop\\work_order1.txt");;
        List<NameValuePair> params=new ArrayList<NameValuePair>();

        params.add(new BasicNameValuePair("file_real_name","work_order1.txt"));

         String Result=postInputStream(url,inputStream,"work_order1.txt",params);
        System.out.println("发送消息收到的返回："+Result);
    }

    public static String postInputStream(String requestUrl,InputStream inputStream, String fileName,
                                         List<NameValuePair> params) throws Exception {
        try {
            CloseableHttpClient httpClient = HttpClients.createDefault();
            // 创建 POST请求
            HttpPost httpPost = new HttpPost(requestUrl);
            // 构建多组件 Entrity构建器
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.setCharset(Charsets.UTF_8);
            builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
            //文件传输http请求头(multipart/form-data)
            builder.addBinaryBody("file", inputStream, ContentType.MULTIPART_FORM_DATA, fileName);// 文件流
            //字节传输http请求头(application/json)
            ContentType contentType = ContentType.create("application/json", Charsets.UTF_8);
            for (NameValuePair param : params) {
                // 传输字节流
                builder.addTextBody(param.getName(), param.getValue(), contentType);
            }
            HttpEntity entity = builder.build();
            httpPost.setEntity(entity);
            HttpResponse response = httpClient.execute(httpPost);
            // 执行提交
            HttpEntity responseEntity = response.getEntity();
            if (responseEntity != null) {
                // 将响应内容转换为字符串
                return EntityUtils.toString(responseEntity, Charsets.UTF_8);
            }
        } catch (Exception e) {
            throw new Exception("post请求失败，"+e.getMessage());
        }
        return "";
    }

}

　　

所需pom依赖：

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
    <version>4.5</version>
</dependency>