java后台如何模拟multipart/form-data请求 实现上传多图和普?400报错

我这段代码是没问题的：addBinaryBody方法的第一个字段就是表单项，不能同名。

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.apache.http.entity.mime.MultipartEntityBuilder;

import java.io.File;

public class UploadFileTest {

    public static void main(String[] args) throws Exception {

        File file1 = new File("D:\\images\\assets\\headImgs\\head_0.png");
        File file2 = new File("D:\\images\\assets\\headImgs\\head_1.png");
        File file3 = new File("D:\\images\\assets\\headImgs\\head_2.png");

        CloseableHttpClient httpclient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost("http://127.0.0.1:80/upload");

        HttpEntity reqEntity = MultipartEntityBuilder.create()
                .addTextBody("status", "这是一条来自java后台的测试微博,文本中必须包含至少一个第三方分享到微博的网页URL,并且字数不能超过140字。http://www.baidu.com")
                .addBinaryBody("img1", file1, ContentType.IMAGE_PNG, file1.getName())
                .addBinaryBody("img2", file2, ContentType.IMAGE_PNG, file2.getName())
                .addBinaryBody("img3", file3, ContentType.IMAGE_PNG, file3.getName())
                .addTextBody("access_token", "2.00yOFlzGV4RsoDf88fdf1a7fINBEJB")
                .build();
        httpPost.setEntity(reqEntity);
        try {
            CloseableHttpResponse response = httpclient.execute(httpPost);
            try {
                int code = response.getStatusLine().getStatusCode();
                String info = response.getStatusLine().getReasonPhrase();
                if(code != 200) {
                    throw new Exception(String.valueOf(code) + "&" + info);
                }
                System.out.println("----------------------------------------");
                System.out.println(response.getStatusLine());
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    System.out.println("Response content length: " + resEntity.getContentLength());
                }
                EntityUtils.consume(resEntity);
            } finally {
                response.close();
            }
        } finally {
            httpclient.close();
        }

    }

}

 

######回复 @银杏卡卡 : 谢谢你耐心回复 我在微博开放平台17年的公告下面的网友评论里找到了 确实只能上传一张图片 这个API文档都没人维护更新 很气人 浪费了大量时间######回复 @泽西岛屿 : 图片看不到######回复 @银杏卡卡 : 我提问的那个截图就是微博API对于发布图文微博的介绍 有点迷茫 没说可以多图也没说不可以 按照他的字段格式提交多图微博的请求却只有一个图片######回复 @泽西岛屿 : 我没弄过这种，微博提供的接口文档有介绍没？是否支持多文件上传呢？如果是那边不支持你们也没办法，直接pass掉好了######回复 @银杏卡卡 : 很苦恼啊 循环多次就变成了多条微博 项目要求是一条微博配多图 有点难受######

用HttpClient不是很简单吗

######

package org.apache.http.examples.entity.mime;

import java.io.File;

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

/**
 * Example how to use multipart/form encoded POST request.
 */
public class ClientMultipartFormPost {

    public static void main(String[] args) throws Exception {
        if (args.length != 1)  {
            System.out.println("File path not given");
            System.exit(1);
        }
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            HttpPost httppost = new HttpPost("http://localhost:8080" +
                    "/servlets-examples/servlet/RequestInfoExample");

            FileBody bin = new FileBody(new File(args[0]));
            StringBody comment = new StringBody("A binary file of some kind", ContentType.TEXT_PLAIN);

            HttpEntity reqEntity = MultipartEntityBuilder.create()
                    .addPart("bin", bin)
                    .addPart("comment", comment)
                    .build();


            httppost.setEntity(reqEntity);

            System.out.println("executing request " + httppost.getRequestLine());
            CloseableHttpResponse response = httpclient.execute(httppost);
            try {
                System.out.println("----------------------------------------");
                System.out.println(response.getStatusLine());
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    System.out.println("Response content length: " + resEntity.getContentLength());
                }
                EntityUtils.consume(resEntity);
            } finally {
                response.close();
            }
        } finally {
            httpclient.close();
        }
    }

}

HttpClient官方例子：

 

######代码在下边，求指教######因为发布图文微博 微博要求图片上传格式是binary 我用的MultipartEntityBuilder和CloseableHttpClient 但是现在只能上传一张图片 不知道怎么传多图######单张图片的很简单 已经实现了 发布多图微博的时候只能传一张图片 不知道有没有什么好方法######

package com.aaa;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;

import org.apache.hc.client5.http.classic.methods.HttpPost;
import org.apache.hc.client5.http.entity.mime.MultipartEntityBuilder;
import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
import org.apache.hc.client5.http.impl.classic.HttpClients;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.HttpEntity;
import org.apache.hc.core5.http.io.entity.EntityUtils;

public class weibo {
	public static void main(String[] args) throws Exception {
		
		File file = new File("E:\\article\\weibo_20190114161835827.jpeg");
		File file1 = new File("E:\\article\\weibo_20190114161836750.jpeg");
		File file2 = new File("E:\\article\\weibo_20190114161837173.jpeg");
		File file3 = new File("E:\\article\\weibo_20190114161837190.jpeg");
		
		CloseableHttpClient httpclient = HttpClients.createDefault();
		HttpPost httpPost = new HttpPost("https://api.weibo.com/2/statuses/share.json");
		
		MultipartEntityBuilder builder = MultipartEntityBuilder.create();
		ContentType strContent = ContentType.create("text/plain",Charset.forName("UTF-8"));
		ContentType imageContent = ContentType.create("image/jpeg");
		builder.addTextBody("status", "这是一条来自java后台的测试微博,文本中必须包含至少一个第三方分享到微博的网页URL,并且字数不能超过140字。http://www.baidu.com", strContent);
		builder.addBinaryBody("pic", file,imageContent, file.getName());
		builder.addBinaryBody("pic", file1,imageContent, file1.getName());
		builder.addBinaryBody("pic", file2,imageContent, file2.getName());
		builder.addBinaryBody("pic", file3,imageContent, file3.getName());
		builder.addTextBody("access_token", "2.00yOFlzGV4RsoDf88fdf1a7fINBEJB");
//		builder.addBinaryBody("name=\"pic\"; filename=\"weibo_20190114161835827.jpeg\"", new File("E:\\article\\weibo_20190114161835827.jpeg"));
//		builder.addBinaryBody("name=\"pic\"; filename=\"weibo_20190114161835827.jpeg\"", new File("E:\\article\\weibo_20190114161835827.jpeg"));
		
		HttpEntity parameterEntity = builder.build();
		httpPost.setEntity(parameterEntity);
		
        CloseableHttpResponse response = httpclient.execute(httpPost);
        if (response.getCode() != 200) {
            throw new Exception(String.valueOf(response.getCode()) + "&" + response.getReasonPhrase());
        }

        HttpEntity resultEntity = response.getEntity();
        if (resultEntity == null) {
            throw new Exception("response null");
        }
        String result = EntityUtils.toString(resultEntity);
        System.out.println("微博发送完毕：" + result);
		
	}
}