자바 - 애플릿 post 관련 업로드 관련

 

 

 

 

 

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출처: http://stackoverflow.com/questions/314300/how-to-simply-generate-post-http-request-from-java-to-do-the-file-upload

 

public void post(String url) throws Exception {
    URL u = new URL(url);
    URLConnection c = u.openConnection();

    c.setDoOutput(true);
    if (c instanceof HttpURLConnection) {
        ((HttpURLConnection) c).setRequestMethod("POST");
    }

    OutputStreamWriter out = new OutputStreamWriter(
        c.getOutputStream());

    // output your data here

    out.close();

    BufferedReader in = new BufferedReader(
        new InputStreamReader(
            c.getInputStream()));

    String s = null;
    while ((s = in .readLine()) != null) {
        System.out.println(s);
    } in .close();
}

 

 

 

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출처: http://dimdol.blogspot.kr/2009/09/%EC%9E%90%EB%B0%94-http-post-%EC%9A%94%EC%B2%AD.html

 

자바 HTTP POST 요청

자바(1.4 이상)로 HTTP POST 요청을 하는 방법이다.

먼저 URLConnection 객체를 생성한다.

URL url = new URL("http://example.dimdol.com/example.jsp");
URLConnection con = url.openConnection();

URLConnection 객체 setRequestProperty 메소드로 HTTP 헤더 정보를 설정한다.

con.setRequestProperty("Accept-Language",  "ko-kr,ko;q=0.8,en-us;q=0.5,en;q=0.3");

URLConnection 객체 setDoOutput 메소드로 POST 요청임을 설정한다.

con.setDoOutput(true);

요청 파라미터는 name=value 패턴으로 지정하고 두 개 이상은 &을 사용해서 연결한다.

String parameter = URLEncoder.encode("name", "UTF-8") + "=" URLEncoder.encode("dimdol", "UTF-8");
parameter += "&" + URLEncoder.encode("age", "UTF-8") + "=" URLEncoder.encode("35", "UTF-8");

 

HTTP 요청을 한다.

OutputStreamWriter wr = new OutputStreamWriter(con.getOutputStream());
wr.write(parameter);
wr.flush();  // 꼭 flush를 호출해야 한다.

 

응답 결과가 텍스트인 경우에는 다음과 같이 처리한다.

BufferedReader rd = null;

rd = new BufferedReader(new InputStreamReader(con.getInputStream(), "UTF-8"));
String line = null;
while ((line = rd.readLine()) != null) {
  // 로직 처리
}

 

응답 결과가 XML인 경우에는 다음과 같이 처리한다.

DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document document = builder.parse(con.getInputStream());

// 이하 document를 이용해서 로직 처리

응답 헤더는 다음과 같이 확인할 수 있다.

String cookie = con.getHeaderField("Set-Cookie");

전체를 try/finally로 묶고 finally 절에서 OutputStreamWriter과 BufferedReader를 close한다.

 

 

 

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출처: http://www.developer.nokia.com/Community/Wiki/HTTP_Post_multipart_file_upload_in_Java_ME

 

This is a Swing application that demonstrates how to use the Jakarta HttpClient multipart POST method for uploading files.

/*
 * $Header$
 * $Revision$
 * $Date$
 * ====================================================================
 *
 *  Copyright 2002-2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.multipart.FilePart;
import 
  org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.commons.httpclient.methods.multipart.Part;
import org.apache.commons.httpclient.params.HttpMethodParams;

/**
 *
 * This is a Swing application that demonstrates
 * how to use the Jakarta HttpClient multipart POST method
 * for uploading files
 *
 * @author Sean C. Sullivan
 * @author Michael Becke
 *
 */
public class MultipartFileUploadApp {
    
    public static void main(String[] args) {
        
        MultipartFileUploadFrame f = new MultipartFileUploadFrame();
        f.setTitle("HTTP multipart file upload application");
        f.pack();
        f.addWindowListener(
                new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        }
        );
        f.setVisible(true);
    }
    
    public static class MultipartFileUploadFrame extends JFrame {
        
        private File targetFile;
        private JTextArea taTextResponse;
        private DefaultComboBoxModel cmbURLModel;
        
        public MultipartFileUploadFrame() {
            
            String[] aURLs = {
                "http://localhost:8080/httpclienttest/fileupload"
            };
            
            cmbURLModel = new DefaultComboBoxModel(aURLs);
            final JComboBox cmbURL = new JComboBox(cmbURLModel);
            cmbURL.setToolTipText("Enter a URL");
            cmbURL.setEditable(true);
            cmbURL.setSelectedIndex(0);
            
            JLabel lblTargetFile = new JLabel("Selected file:");
            
            final JTextField tfdTargetFile = new JTextField(30);
            tfdTargetFile.setEditable(false);
            
            final JCheckBox cbxExpectHeader = new JCheckBox(
                    "Use Expect header");
            
            cbxExpectHeader.setSelected(false);
            
            
            final JButton btnDoUpload = new JButton("Upload");
            btnDoUpload.setEnabled(false);
            
            final JButton btnSelectFile = new JButton("Select a file...");
            btnSelectFile.addActionListener(
                    new ActionListener() {
                public void actionPerformed(ActionEvent evt) {
                    
                    JFileChooser chooser = new JFileChooser();
                    chooser.setFileHidingEnabled(false);
                    chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
                    chooser.setMultiSelectionEnabled(false);
                    chooser.setDialogType(JFileChooser.OPEN_DIALOG);
                    chooser.setDialogTitle("Choose a file...");
                    
                    if (
                            chooser.showOpenDialog(
                            MultipartFileUploadFrame.this)
                            == JFileChooser.APPROVE_OPTION
                            ) {
                        targetFile = chooser.getSelectedFile();
                        tfdTargetFile.setText(targetFile.toString());
                        btnDoUpload.setEnabled(true);
                        
                    }
                }
            }
            );
            
            taTextResponse = new JTextArea(10, 40);
            taTextResponse.setEditable(false);
            
            final JLabel lblURL = new JLabel("URL:");
            
            btnDoUpload.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent ae) {
                    String targetURL = cmbURL.getSelectedItem().toString();
                    // add the URL to the combo model 
                    // if it's not already there
                    if (!targetURL
                            .equals(
                            cmbURLModel.getElementAt(
                            cmbURL.getSelectedIndex()))) {
                        cmbURLModel.addElement(targetURL);
                    }
                    
                    PostMethod filePost = new PostMethod(targetURL);
                    
                    filePost.getParams().setBooleanParameter(
                            HttpMethodParams.USE_EXPECT_CONTINUE,
                            cbxExpectHeader.isSelected());
                    
                    try {
                        
                        appendMessage("Uploading " + targetFile.getName() + 
                                " to " + targetURL);
                        
                        Part[] parts = {
                            new FilePart(targetFile.getName(), targetFile)
                        };
                        
                        filePost.setRequestEntity(
                                new MultipartRequestEntity(parts, 
                                filePost.getParams())
                                );
                        
                        HttpClient client = new HttpClient();
                        client.getHttpConnectionManager().
                                getParams().setConnectionTimeout(5000);
                        
                        int status = client.executeMethod(filePost);
                        
                        if (status == HttpStatus.SC_OK) {
                            appendMessage(
                                    "Upload complete, response=" + 
                                    filePost.getResponseBodyAsString()
                                    );
                        } else {
                            appendMessage(
                                    "Upload failed, response=" + 
                                    HttpStatus.getStatusText(status)
                                    );
                        }
                    } catch (Exception ex) {
                        appendMessage("Error: " + ex.getMessage());
                        ex.printStackTrace();
                    } finally {
                        filePost.releaseConnection();
                    }
                    
                }
            });
            
            getContentPane().setLayout(new GridBagLayout());
            GridBagConstraints c = new GridBagConstraints();
            
            c.anchor = GridBagConstraints.EAST;
            c.fill = GridBagConstraints.NONE;
            c.gridheight = 1;
            c.gridwidth = 1;
            c.gridx = 0;
            c.gridy = 0;
            c.insets = new Insets(10, 5, 5, 0);
            c.weightx = 1;
            c.weighty = 1;
            getContentPane().add(lblURL, c);
            
            c.anchor = GridBagConstraints.WEST;
            c.fill = GridBagConstraints.HORIZONTAL;
            c.gridwidth = 2;
            c.gridx = 1;
            c.insets = new Insets(5, 5, 5, 10);
            getContentPane().add(cmbURL, c);
            
            c.anchor = GridBagConstraints.EAST;
            c.fill = GridBagConstraints.NONE;
            c.insets = new Insets(10, 5, 5, 0);
            c.gridwidth = 1;
            c.gridx = 0;
            c.gridy = 1;
            getContentPane().add(lblTargetFile, c);
            
            c.anchor = GridBagConstraints.CENTER;
            c.fill = GridBagConstraints.HORIZONTAL;
            c.insets = new Insets(5, 5, 5, 5);
            c.gridwidth = 1;
            c.gridx = 1;
            getContentPane().add(tfdTargetFile, c);
            
            c.anchor = GridBagConstraints.WEST;
            c.fill = GridBagConstraints.NONE;
            c.insets = new Insets(5, 5, 5, 10);
            c.gridwidth = 1;
            c.gridx = 2;
            getContentPane().add(btnSelectFile, c);
            
            c.anchor = GridBagConstraints.CENTER;
            c.fill = GridBagConstraints.NONE;
            c.insets = new Insets(10, 10, 10, 10);
            c.gridwidth = 3;
            c.gridx = 0;
            c.gridy = 2;
            getContentPane().add(cbxExpectHeader, c);
            
            
            c.anchor = GridBagConstraints.CENTER;
            c.fill = GridBagConstraints.NONE;
            c.insets = new Insets(10, 10, 10, 10);
            c.gridwidth = 3;
            c.gridx = 0;
            c.gridy = 3;
            getContentPane().add(btnDoUpload, c);
            
            c.anchor = GridBagConstraints.CENTER;
            c.fill = GridBagConstraints.BOTH;
            c.insets = new Insets(10, 10, 10, 10);
            c.gridwidth = 3;
            c.gridheight = 3;
            c.weighty = 3;
            c.gridx = 0;
            c.gridy = 4;
            getContentPane().add(new JScrollPane(taTextResponse), c);
        }
        
        private void appendMessage(String m) {
            taTextResponse.append(m + "\n");
        }
    }
}

 

 

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출처: http://stackoverflow.com/questions/1599018/java-applet-to-upload-a-file

 

i am looking for a Java applet to read a file from client machine and creat a POST request for PHP server uploading.

PHP script on server should receive the file as normal file upload in FORM submit. I am using the following code. The file contents are passed to PHP script but they are not correctly converted to an image.

 

//uploadURL will be a url of PHP script like
// http://www.example.com/uploadfile.php
URL url = new URL(uploadURL);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("POST");
con.setDoInput(true);
con.setDoOutput(true);

InputStream is = new FileInputStream("C://img.jpg");
OutputStream os = con.getOutputStream();
byte[] b1 = new byte[10000000];
int n;
while ((n = is.read(b1)) != -1) {
    os.write("hello", 0, 5);
    test += b1;

}
con.connect();

2 Answers
active oldest votes
up vote 6 down vote accepted  
Here's some code that might help you .. it's from one of my old projects with a bunch of unrelated stuff removed, take it for what it's worth. Basically, I think the code in your question is missing some parts that the HTTP protocol requires. Good luck!

 

public class UploaderExample
{
    private static final String Boundary = "--7d021a37605f0";

    public void upload(URL url, List<File> files) throws Exception
    {
        HttpURLConnection theUrlConnection = (HttpURLConnection) url.openConnection();
        theUrlConnection.setDoOutput(true);
        theUrlConnection.setDoInput(true);
        theUrlConnection.setUseCaches(false);
        theUrlConnection.setChunkedStreamingMode(1024);

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

        DataOutputStream httpOut = new DataOutputStream(theUrlConnection.getOutputStream());

        for (int i = 0; i < files.size(); i++)
        {
            File f = files.get(i);
            String str = "--" + Boundary + "\r\n"
                       + "Content-Disposition: form-data;name=\"file" + i + "\"; filename=\"" + f.getName() + "\"\r\n"
                       + "Content-Type: image/png\r\n"
                       + "\r\n";

            httpOut.write(str.getBytes());

            FileInputStream uploadFileReader = new FileInputStream(f);
            int numBytesToRead = 1024;
            int availableBytesToRead;
            while ((availableBytesToRead = uploadFileReader.available()) > 0)
            {
                byte[] bufferBytesRead;
                bufferBytesRead = availableBytesToRead >= numBytesToRead ? new byte[numBytesToRead]
                        : new byte[availableBytesToRead];
                uploadFileReader.read(bufferBytesRead);
                httpOut.write(bufferBytesRead);
                httpOut.flush();
            }
            httpOut.write(("--" + Boundary + "--\r\n").getBytes());

        }

        httpOut.write(("--" + Boundary + "--\r\n").getBytes());

        httpOut.flush();
        httpOut.close();

        // read & parse the response
        InputStream is = theUrlConnection.getInputStream();
        StringBuilder response = new StringBuilder();
        byte[] respBuffer = new byte[4096];
        while (is.read(respBuffer) >= 0)
        {
            response.append(new String(respBuffer).trim());
        }
        is.close();
        System.out.println(response.toString());
    }

    public static void main(String[] args) throws Exception
    {
        List<File> list = new ArrayList<File>();
        list.add(new File("C:\\square.png"));
        list.add(new File("C:\\narrow.png"));
        UploaderExample uploader = new UploaderExample();
        uploader.upload(new URL("http://systemout.com/upload.php"), list);
    }

}

 

 

관련링크:

http://www.velocityreviews.com/forums/t151666-posting-through-http-post-in-applet.html

http://stackoverflow.com/questions/314300/how-to-simply-generate-post-http-request-from-java-to-do-the-file-upload

http://www.albumbang.com/board/board_view.jsp?board_name=free&no=292

http://www.developer.nokia.com/Community/Wiki/HTTP_Post_multipart_file_upload_in_Java_ME

http://stackoverflow.com/questions/6917105/java-http-client-to-upload-file-over-post

http://stackoverflow.com/questions/9692166/http-post-in-java-with-file-upload

 

 

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