HttpClient方式请求发送multipart-form-data混合数据（包括多个文件和json字符串等）

前言：

之前用了spring框架的restTemplate实现multipart-form-data混合数据（包括多个文件和json字符串等）的上传，现在使用httpClient方式来实现。

环境：

    commons-httpclient
    commons-httpclient
    3.1


    org.apache.httpcomponents
    httpmime
    4.5.3

实现：

发送端：

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
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.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public static void main(String[] args) {
    List filePaths = new ArrayList<>();
    filePaths.add("E:\\test\\picture\\大.png");
    filePaths.add("E:\\test\\picture\\2.png");
    sendMultiFormMixData("http://localhost:8080/receive", filePaths, "测试多文件数据中文乱码");
}

 
   public static void sendMultiFormMixData(String url, List filePaths, String data) {
        HttpClient client = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost(url);

        try {
            // 设置传输参数,设置编码。设置浏览器兼容模式，解决文件名乱码问题
            MultipartEntityBuilder builder = MultipartEntityBuilder.create().setMode(HttpMultipartMode.RFC6532);
            for (String filePath : filePaths) {
                File file = new File(filePath);
                if (!file.exists()) {
                    continue;
                } else {
//                    // 无法解决中文文件名？的问题
//                    ContentType contentType = ContentType.create("multipart/form-data", Charset.forName("UTF-8"));
//                    ContentBody fileBody = new FileBody(file, contentType);
                    ContentBody fileBody = new FileBody(file, ContentType.MULTIPART_FORM_DATA);
                    builder.addPart("file", fileBody);
                }
            }
            // 解决中文字符？的问题
            ContentType contentType = ContentType.create("text/plain", Charset.forName("UTF-8"));
            builder.addPart("data", new StringBody(data, contentType));
            HttpEntity httpEntity = builder.build();
            httpPost.setEntity(httpEntity);
            HttpResponse response = client.execute(httpPost);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                String jsonData = EntityUtils.toString(response.getEntity(),  "UTF-8");
                System.out.println("response result = " + jsonData);
            } else {
                System.out.println("no response");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

接收端：

@PostMapping(value = "/receive")
public Object testUploading(@RequestParam("file") MultipartFile[] files , String data) {
    String filepath = "E:\\test\\save\\";
    File targetFile = new File(filepath);
    if (!targetFile.exists()) {
        targetFile.mkdirs();
    }
    List dp = new ArrayList<>() ;
    for(int i = 0 ; i < files.length ; i++){
        MultipartFile file = files[i] ;
        try {
            FileOutputStream out = new FileOutputStream(filepath + file.getOriginalFilename());
            out.write(file.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return "SUCCESS";
}

总结：

1、httpClient工具类在平常的工作中使用还是比较广泛的，一般网上都到的对其封装的工具类都是比较好的，除了一些特殊的要求需要自己查看资料编写一下，问题不大；
2、注意导包的问题以及一些api过时，既然有新的，代码上尽量还是用新的。