Java 上传各种形式的数据

希洛

我试图将一些数据上传到我的Web服务器。 whit curl很好用

curl -s -uedoweb-admin:admin -F"data=@/home/raul/test/t1/6376990.pdf;type=application/pdf" -XPUT api.localhost/resource/frl:6376979/data

这是痕迹

这里是新方法

        URL myurl;
    HttpURLConnection conn;
    String port = "9000";

    String user = "edoweb-admin";
    String password = "admin";
    String encoding = Base64.encodeBase64String((user + ":" + password).getBytes());
    String boundary = "==" + System.currentTimeMillis() + "===";
    String crlf = "\r\n";
    String twoHyphens = "--";
    String attachmentName = "data";
    String attachmentFileName = "6376986.pdf";

    DataOutputStream request;

    try {
        myurl = new URL("http://localhost:9000/resource/frl:6376984/data");
        conn = (HttpURLConnection) myurl.openConnection();
        conn.setDoOutput(true);
        conn.setRequestMethod("PUT");
        conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
        conn.setRequestProperty("Accept", "*/*");

    } catch (Exception e) {
        throw new RuntimeException(e);
    }

    try {
        request = new DataOutputStream(conn.getOutputStream());

        request.writeBytes(twoHyphens + boundary + crlf);
        request.writeBytes("Content-Disposition: form-data; name=\"" + attachmentName + "\";filename=\""
                + attachmentFileName + "\"" + crlf);
        request.writeBytes("Content-Type: application/pdf");
        request.writeBytes(crlf);
        System.out.println(conn.getResponseCode());
    } catch (Exception e) {
        throw new RuntimeException(e);
    }

我在代码和Web服务器上发现了一些问题。我写了一个新的方法，现在是服务器响应400

---

有人能帮我吗？

我自己发现的

代码如下：

public void form_test() {
    try {
        url = new URL("http://localhost:9000/resource/frl:6376984/data");
        httpCon = (HttpURLConnection) url.openConnection();
        String userpass = user + ":" + password;
        basicAuth = "Basic " + new String(new Base64().encode(userpass.getBytes()));
        httpCon.setRequestProperty("Authorization", basicAuth);
        String fieldName = "data";
        File uploadFile = new File("/home/raul/test/frl%3A6376984/6376990.pdf");
        String boundary = "" + System.currentTimeMillis() + "";

        httpCon.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
        httpCon.setRequestProperty("file", "6376986.pdf");

        httpCon.setUseCaches(false);
        httpCon.setDoOutput(true);
        httpCon.setDoInput(true);

        httpCon.setRequestMethod("PUT");

        OutputStream outputStream = null;
        try {
            outputStream = (httpCon.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
        PrintWriter writer = null;
        try {
            writer = new PrintWriter(new OutputStreamWriter(outputStream, "UTF-8"), true);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String LINE_FEED = "\r\n";
        String fileName = uploadFile.getName();
        writer.append("--" + boundary).append(LINE_FEED);
        writer.append("Content-Disposition: form-data; name=\"" + fieldName + "\"; filename=\"" + fileName + "\"")
                .append(LINE_FEED);
        writer.append("Content-Type: " + URLConnection.guessContentTypeFromName(fileName)).append(LINE_FEED);
        writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);
        System.out.println("Content-Transfer-Encoding: binary" + (LINE_FEED));
        writer.append(LINE_FEED);

        writer.flush();

        fileToOutputStream(uploadFile, outputStream);
        try {
            outputStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }

        writer.append(LINE_FEED);
        writer.flush();
        writer.close();
        httpCon.disconnect();

        try {
            System.out.println(httpCon.getResponseCode());
            System.out.println(httpCon.getResponseMessage());
        } catch (IOException e) {
            e.printStackTrace();
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
}

第一个错误是边界字符串开头的字符“=”。似乎我的Web服务器不喜欢边界字段中有这么多的等号，所以我在这里只设置了一个：

httpCon.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

并从字符串边界中删除这些

String boundary = "" + System.currentTimeMillis() + "";

当我尝试上传文件时，我在Wireshark中也收到一些错误消息“数据包大小超出限制”，在Java中收到一些响应代码400，但现在使用这种方法，效果很好。

---

谢谢你们的支持和建议。

我自己发现的

代码如下：

public void form_test() {
    try {
        url = new URL("http://localhost:9000/resource/frl:6376984/data");
        httpCon = (HttpURLConnection) url.openConnection();
        String userpass = user + ":" + password;
        basicAuth = "Basic " + new String(new Base64().encode(userpass.getBytes()));
        httpCon.setRequestProperty("Authorization", basicAuth);
        String fieldName = "data";
        File uploadFile = new File("/home/raul/test/frl%3A6376984/6376990.pdf");
        String boundary = "" + System.currentTimeMillis() + "";

        httpCon.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
        httpCon.setRequestProperty("file", "6376986.pdf");

        httpCon.setUseCaches(false);
        httpCon.setDoOutput(true);
        httpCon.setDoInput(true);

        httpCon.setRequestMethod("PUT");

        OutputStream outputStream = null;
        try {
            outputStream = (httpCon.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
        PrintWriter writer = null;
        try {
            writer = new PrintWriter(new OutputStreamWriter(outputStream, "UTF-8"), true);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        String LINE_FEED = "\r\n";
        String fileName = uploadFile.getName();
        writer.append("--" + boundary).append(LINE_FEED);
        writer.append("Content-Disposition: form-data; name=\"" + fieldName + "\"; filename=\"" + fileName + "\"")
                .append(LINE_FEED);
        writer.append("Content-Type: " + URLConnection.guessContentTypeFromName(fileName)).append(LINE_FEED);
        writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);
        System.out.println("Content-Transfer-Encoding: binary" + (LINE_FEED));
        writer.append(LINE_FEED);

        writer.flush();

        fileToOutputStream(uploadFile, outputStream);
        try {
            outputStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }

        writer.append(LINE_FEED);
        writer.flush();
        writer.close();
        httpCon.disconnect();

        try {
            System.out.println(httpCon.getResponseCode());
            System.out.println(httpCon.getResponseMessage());
        } catch (IOException e) {
            e.printStackTrace();
        }

    } catch (Exception e) {
        e.printStackTrace();
    }
}

第一个错误是边界字符串开头的字符“=”。似乎我的Web服务器不喜欢边界字段中有这么多的等号，所以我在这里只设置了一个：

httpCon.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

并从字符串边界中删除这些

String boundary = "" + System.currentTimeMillis() + "";

当我尝试上传文件时，我在Wireshark中也收到一些错误消息“数据包大小超出限制”，在Java中收到一些响应代码400，但现在使用这种方法，效果很好。

---

感谢大家的支持和建议。

有两件事需要改进。1.用try-catch-for-Exception或THrowable围绕您的测试，看看是否有任何错误。2.你能在服务器的日志上看到你用来测试请求是否真的到达了那里吗？我用try-catch和绿色环绕了多行。日志中没有显示有关我的尝试的任何信息。请使用包含尝试捕获的代码编辑您的问题。您没有使用代码访问服务器这一事实意味着您有一个NPE或其他东西。这个问题及其答案可能会帮助您，看起来该库有一些奇怪的行为。这是提高诊断的两个方面。1.用try-catch-for-Exception或THrowable围绕您的测试，看看是否有任何错误。2.你能在服务器的日志上看到你用来测试请求是否真的到达了那里吗？我用try-catch和绿色环绕了多行。日志中没有显示有关我的尝试的任何信息。请使用包含尝试捕获的代码编辑您的问题。您没有使用代码访问服务器这一事实意味着您有一个NPE或其他东西。这个问题及其答案可能会帮助您，看起来该库有一些奇怪的行为。这个也是