java文件上传报文解析与实现

POST /epg/admin/epg/originalfile/upload.doHTTP/1.1
 
Accept-Encoding: gzip, deflate
Content-Length: 3714479
Content-Type: multipart/form-data;boundary=---------------------------161393124728552
Cookie:JSESSIONID=892218FFF1CD71AA8A4A2E8A52FA2BBA
Host: 192.168.1.107:8090
Connection: keep-alive
 
-----------------------------161393124728552
Content-Disposition: form-data;name="file"; filename="17df-x0hjki.xml"
Content-Type: text/xml
 
<?xml version="1.0"encoding="UTF-8"?><tv>
/** 文件数据 */</tv>
-----------------------------161393124728552
Content-Disposition: form-data;name="sourceId"
 
2
-----------------------------161393124728552--

POST /epg/admin/epg/originalfile/upload.doHTTP/1.1

Content-Type: multipart/form-data;boundary=---------------------------161393124728552
Cookie:JSESSIONID=892218FFF1CD71AA8A4A2E8A52FA2BBA
Connection: keep-alive

-----------------------------161393124728552
Content-Disposition: form-data;name="file"; filename="17df-x0hjki.xml"
Content-Type: text/xml
 
<?xml version="1.0"encoding="UTF-8"?><tv>
/** 文件数据 */</tv>
-----------------------------161393124728552
Content-Disposition: form-data;name="sourceId"
 
2
-----------------------------161393124728552--

public static void uploadFile(String fileName) {
    try {

        // 换行符
        final StringnewLine = "\r\n";
        final String boundaryPrefix = "--";
        // 定义数据分隔线
        String BOUNDARY = "----WebKitFormBoundaryAvVfvFPWnCBmJzQ5";
        // 服务器的域名
        URL url = new URL("http://192.168.1.107:8090/epg/admin/epg/originalfile/upload.do");
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        // 设置为POST情
        conn.setRequestMethod("POST");
        // 发送POST请求必须设置如下两行
        conn.setDoOutput(true);
        conn.setDoInput(true);
        // 设置请求头参数
        conn.setRequestProperty("connection", "Keep-Alive");
        conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + BOUNDARY);
        conn.setRequestProperty("Content-Length", "3714479");
        conn.setRequestProperty("Cookie", "JSESSIONID=CEA219E45CC9894D59D9F07FBD8597C6");
        conn.setRequestProperty("User-Agent", "Mozilla/5.0(Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko)Chrome/59.0.3071.115 Safari/537.36");

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


        StringBuilder sb2 = new StringBuilder();
        sb2.append(boundaryPrefix + BOUNDARY + newLine);
        // 文件参数,photo参数名可以随意修改
        sb2.append("Content-Disposition:form-data; name=\"sourceId\"");
        // 参数头设置完以后需要两个换行，然后才是参数内容
        sb2.append(newLine);
        sb2.append(newLine);
        sb2.append(2);

        // 将参数头的数据写入到输出流中
        out.write(sb2.toString().getBytes());

        // 上传文件
        File file = new File(fileName);
        StringBuilder sb = new StringBuilder();
        sb.append(newLine + boundaryPrefix + BOUNDARY + newLine);
        // 文件参数,参数名可以随意修改
        sb.append("Content-Disposition:form-data; name=\"file\";filename=\"" + file.getName()
                + "\"");
        sb.append(newLine + "Content-Type: text/xml");
        // 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);
        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
        in.close();

        System.out.println(sb.toString());
        System.out.println(sb2.toString());

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