HTTP POST 发送File 并设置请求头

package com.simpro.util;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class QdfsFaceToPostHttpHeader {
  public static void main(String[] args) {
    String fileurl = "C:\\Users\\wz_xiaomingbai\\Pictures\\kefu.jpg";
    uploadFile(fileurl);
  }
  public static void uploadFile(String fileName) {  
    try {  

        // 换行符  
        final String newLine = "\r\n";  
        final String boundaryPrefix = "--";  
        // 定义数据分隔线  
        String BOUNDARY = "========7d4a6d158c9";  
        // 服务器的域名  
        URL url = new URL("http://123.127.2.222:22111/search");  
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
        // 设置为POST
        conn.setRequestMethod("POST");  
        // 发送POST请求必须设置如下两行  
        conn.setDoOutput(true);  
        conn.setDoInput(true);  
        conn.setUseCaches(false);  
        // 设置请求头参数  
        conn.setRequestProperty("token", "e1cd399582e14c7eb722f3509f115964");  
        //conn.setRequestProperty("connection", "Keep-Alive");  
        //conn.setRequestProperty("Charsert", "UTF-8");  
        conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);  

        OutputStream out = new DataOutputStream(conn.getOutputStream());  

        // 上传文件  
        File file = new File(fileName);  
        StringBuilder sb = new StringBuilder();  
        sb.append(boundaryPrefix);  
        sb.append(BOUNDARY);  
        sb.append(newLine);  
        // 文件参数,photo参数名可以随意修改  
        sb.append("Content-Disposition: form-data;name=\"file\";filename=\"" + fileName  
                + "\"" + newLine);  
        sb.append("Content-Type:image/jpeg");  
        // 参数头设置完以后需要两个换行，然后才是参数内容  
        sb.append(newLine);  
        sb.append(newLine);  

        // 将参数头的数据写入到输出流中  
        out.write(sb.toString().getBytes());  

        // 数据输入流,用于读取文件数据  
        DataInputStream in = new DataInputStream(new FileInputStream(  
                file));  
        byte[] bufferOut = new byte[1024];  
        int bytes = 0;  
        // 每次读1KB数据,并且将文件数据写入到输出流中  
        while ((bytes = in.read(bufferOut)) != -1) { 
            out.write(bufferOut, 0, bytes);  
        }  
        // 最后添加换行  
        out.write(newLine.getBytes());  
        in.close();  

        // 定义最后数据分隔线，即--加上BOUNDARY再加上--。  
        byte[] end_data = (newLine + boundaryPrefix + BOUNDARY + boundaryPrefix + newLine)  
                .getBytes();  
        // 写上结尾标识  
        out.write(end_data);  
        out.flush();  
        out.close();  

        // 定义BufferedReader输入流来读取URL的响应  
        BufferedReader reader = new BufferedReader(new InputStreamReader(  
                conn.getInputStream()));  
        String line = null;  
        while ((line = reader.readLine()) != null) {  
            System.out.println(line);  
        }  

    } catch (Exception e) {  
        System.out.println("发送POST请求出现异常！" + e);  
        e.printStackTrace();  
    }  
}
}