接口传输协议：HTTP

接口请求方式：POST

数据编码格式：UTF-8

数据传输格式：multipart/form-data

需求：使用multipart/form-data格式传输文件到给定接口。

工具类：

<code>

import lombok.extern.slf4j.Slf4j;

import org.apache.http.Consts;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.HttpStatus;

import org.apache.http.client.config.RequestConfig;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.client.methods.HttpRequestBase;

import org.apache.http.conn.ssl.NoopHostnameVerifier;

import org.apache.http.conn.ssl.SSLConnectionSocketFactory;

import org.apache.http.conn.ssl.TrustStrategy;

import org.apache.http.entity.ContentType;

import org.apache.http.entity.mime.HttpMultipartMode;

import org.apache.http.entity.mime.MultipartEntityBuilder;

import org.apache.http.entity.mime.content.StringBody;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClientBuilder;

import org.apache.http.ssl.SSLContextBuilder;

import org.apache.http.util.EntityUtils;

import javax.net.ssl.SSLContext;

import java.io.File;

import java.io.IOException;

import java.security.cert.CertificateException;

import java.security.cert.X509Certificate;

import java.util.HashMap;

import java.util.Map;

/**

* <p>

*

* @author 花鼠大师

* @version :1.0

* @date 2024/4/12 15:10

*/

@Slf4j

public class SendFileUtils {

/**

* 使用multipart/form-data方式传输文件

* 发送文件方法

* @param url 接口地址

* @param file 文件

*/

public static String sendMultipartFile(String url, File file) {

//获取HttpClient

CloseableHttpClient client = getHttpClient();

HttpPost httpPost = new HttpPost(url);

fillMethod(httpPost,System.currentTimeMillis());

// 请求参数配置

RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000)

.setConnectionRequestTimeout(10000).build();

httpPost.setConfig(requestConfig);

String res = "";

String fileName = file.getName();//文件名

try {

MultipartEntityBuilder builder = MultipartEntityBuilder.create();

builder.setCharset(java.nio.charset.Charset.forName("UTF-8"));

builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);

/**

* 假设有两个参数需要传输

* 参数名:filaName 值 "文件名"

* 参数名:file 值:file (该参数值为file对象)

*/

//表单中普通参数

builder.addPart("filaName ",new StringBody("来源", ContentType.create("text/plain", Consts.UTF_8)));

// 表单中的文件参数 注意，builder.addBinaryBody的第一个参数要写参数名

builder.addBinaryBody("file", file, ContentType.create("multipart/form-data",Consts.UTF_8), fileName);

HttpEntity entity = builder.build();

httpPost.setEntity(entity);

HttpResponse response = client.execute(httpPost);// 执行提交

if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {

// 返回响应结果

res = EntityUtils.toString(response.getEntity(), java.nio.charset.Charset.forName("UTF-8"));

}else {

res = "响应失败";

log.error("响应失败！");

}

return res;

} catch (Exception e) {

e.printStackTrace();

log.error("调用HttpPost失败！" + e.toString());

} finally {

if (client != null) {

try {

client.close();

} catch (IOException e) {

log.error("关闭HttpPost连接失败！");

}

}

}

log.info("数据传输成功!!!!!!!!!!!!!!!!!!!!");

return res;

}

/**

* 获取HttpClient

* @return

*/

private static CloseableHttpClient getHttpClient(){

SSLContext sslContext = null;

try {

sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {

public boolean isTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {

return true;

}

}).build();

} catch (Exception e) {

e.printStackTrace();

throw new RuntimeException(e);

}

SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(sslContext,

NoopHostnameVerifier.INSTANCE);

CloseableHttpClient client = HttpClientBuilder.create().setSSLSocketFactory(sslConnectionSocketFactory).build();

return client;

}

/**

* 添加头文件信息

* @param requestBase

* @param timestamp

*/

private static void fillMethod(HttpRequestBase requestBase, long timestamp){

//此处为举例，需要添加哪些头部信息自行添加即可

//设置时间戳,nginx,underscores_in_headers on;放到http配置里，否则nginx会忽略包含"_"的头信息

requestBase.addHeader("timestamp",String.valueOf(timestamp));

System.out.println(requestBase.getAllHeaders());

}

}

所需依赖：

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->

<dependency>

<groupId>org.apache.httpcomponents</groupId>

<artifactId>httpclient</artifactId>

<version>4.5.13</version>

</dependency>