Java发送form-data请求的实例代码

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.13</version>
</dependency>

package request;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
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.MultipartEntityBuilder;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import java.io.File;
import java.io.IOException;
public class FormDataExample {
    public static void main(String[] args) throws IOException {
        String  url = "http://127.0.0.1:3000/aaa/fileUpload.jsp";
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.addTextBody("text2", "value1");
        builder.addTextBody("text3", "value2");
        builder.addBinaryBody("file1", new File("D:\\fanwei\\学习\\工具地址.txt"), ContentType.APPLICATION_OCTET_STREAM, "filename2.txt");
        String StringResult = sendPostFormData(url, builder);
        System.out.println(StringResult);
    }
    /**
     * @param url 请求地址
     * @param builder
     * @return
     */
    public static String  sendPostFormData(String url, MultipartEntityBuilder builder){
        String StringResult = "";
        //不需要手动关闭httpClient
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpPost httpPost = new HttpPost(url);
        // 构建form-data请求体
        HttpEntity entity = builder.build();
        httpPost.setEntity(entity);
        // 发送请求并获取响应
        HttpResponse response = null;
        try {
            response = httpClient.execute(httpPost);
            HttpEntity responseEntity = response.getEntity();
            StringResult = EntityUtils.toString(responseEntity);
        } catch (IOException e) {
            StringResult = "errorException:" + e.getMessage();
            e.printStackTrace();
        }
        return StringResult;
    }
}

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.13</version>
</dependency>

package request;
import okhttp3.*;
import java.io.File;
import java.io.IOException;
public class FormDataExample2 {
    public static void main(String[] args) throws IOException {
        OkHttpClient client = new OkHttpClient();
        // 构建form-data请求体
        RequestBody requestBody = new MultipartBody.Builder()
                .setType(MultipartBody.FORM)
                .addFormDataPart("field1", "value1")
                .addFormDataPart("field2", "value2")
                .addFormDataPart("file", "filename.txt",
                        RequestBody.create(MediaType.parse("application/octet-stream"), new File("D:\\fanwei\\学习\\工具地址.txt")))
                .build();
        // 构建请求
        Request request = new Request.Builder()
                .url("http://127.0.0.1:3000/aaa/fileUpload.jsp")
                .post(requestBody)
                .build();
        // 发送请求并获取响应
        try (Response response = client.newCall(request).execute()) {
            String responseBody = response.body().string();
            // 处理响应
            System.out.println(responseBody);
        }
    }
}