Java HttpURLConnection 使用

/**

*

*/

package com.demo.java;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLConnection;

import java.util.List;

import java.util.Map;

/**

*

描述：

*

* @author saohuo

* @date 2019年11月4日

* @version

*/

public class MultipartFormDataPost {

// multipart/form-data; 表单各字段提交分隔符

private static String boundary = "--69695201314";

public void submit(Map generalField, List files) throws Exception {

HttpURLConnection connection = null;

OutputStream os = null;

URL url = new URL("http:");

connection = (HttpURLConnection) url.openConnection();

connection.setDoInput(true);

connection.setDoOutput(true);

connection.setRequestMethod("POST");

connection.setUseCaches(false);

connection.setRequestProperty("Connection", "Keep-Alive");

connection.setRequestProperty("Accept-Charset", "UTF-8");

connection.setRequestProperty("content-type", "multipart/form-data;boundary="+boundary);

os = new DataOutputStream(connection.getOutputStream());

// 文本参数组装

StringBuffer textFormBody = new StringBuffer();

Map formField = generalField;

formField.forEach((k,v) -> {

textFormBody.append("\r\n").append("--").append(boundary).append("\r\n");

textFormBody.append("Content-Disposition: form-data; name=\""+k+"\"");

textFormBody.append("\r\n\r\n");//名称与数据之间要有两个回车换行

textFormBody.append(v);

});

// 提交文本表单

os.write(textFormBody.toString().getBytes("UTF-8"));

// 文件数据

if (files != null && !files.isEmpty()) {

int fileIndex = 0;

for(File file : files) {

String filename = file.getName();

String fileMinetype = URLConnection.getFileNameMap().getContentTypeFor(filename);

StringBuffer fileFormBody = new StringBuffer();

fileFormBody.append("\r\n").append("--").append(boundary).append("\r\n");

fileFormBody.append("Content-Disposition: form-data; name=\"files["+fileIndex+"]\"; filename=\"" + filename + "\"");

fileFormBody.append("\r\n");

fileFormBody.append("Content-Type:" + fileMinetype);

fileFormBody.append("\r\n\r\n");

// 提交文件基本信息(文件名、文件长度、文件类型等)

os.write(fileFormBody.toString().getBytes());

InputStream fileStream = new FileInputStream(file);

DataInputStream fileDataIs = new DataInputStream(fileStream);

int filebytes = 0;

byte[] filebufferOut = new byte[1024];

while ((filebytes = fileDataIs.read(filebufferOut)) != -1) {

os.write(filebufferOut, 0, filebytes);

}

fileDataIs.close();

fileIndex++;

}

} // 文件写入结束

// 最后写入结束标识

byte[] endBodyData = ("\r\n--" + boundary + "--\r\n").getBytes();

os.write(endBodyData);

os.flush();

int responseCode = connection.getResponseCode();

// 提交结果状态码

System.out.println(responseCode);

}

}