在Java中发送form-data请求,可以使用Apache HttpClient或OkHttp这样的HTTP客户端库来发送请求。

一、HttpClient

1.添加依赖

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

2.代码

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;
    }
}

对于HttpClient对象,HttpClientBuilder.create().build()创建的实例是不需要手动关闭的。

在使用HttpClientBuilder创建HttpClient对象时,不需要手动关闭HttpClient对象。这是因为HttpClientBuilder在创建HttpClient对象时,会自动管理底层的连接池和资源释放。

HttpClientBuilder会创建一个CloseableHttpClient的实例,它实现了Closeable接口,可以自动关闭相关资源。当不再需要使用HttpClient时,可以让垃圾回收器自动回收HttpClient对象,并自动关闭底层的连接池和资源。

需要注意的是,如果使用了连接池,关闭HttpClient并不会立即关闭底层的连接池,而是将连接返回给连接池以供重用。连接池会根据一定的策略来管理连接的生命周期。因此,关闭HttpClient并不会立即关闭与服务器的连接,而是将连接返回给连接池以供下次使用。

总结起来,使用HttpClientBuilder创建的HttpClient对象不需要手动关闭,它会自动管理底层的连接池和资源释放。当不再需要使用HttpClient时,可以让垃圾回收器自动回收HttpClient对象。

二、OkHttp

1.添加依赖

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

2.代码

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);
        }
    }
}

其他发送请求,请参阅

httpclient 发送请求_httpclient发请求_有梦想的菜的博客-CSDN博客

文件上传,请参阅

Java文件上传_java上传文件_有梦想的菜的博客-CSDN博客

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