codice:
import java.io.*;
import java.net.*;
/**
* <code>MultiPartFormOutputStream</code> is used to write
* "multipart/form-data" to a <code>java.net.URLConnection</code> for
* POSTing. This is primarily for file uploading to HTTP servers.
*
* @since JDK1.3
*/
public class MultiPartFormOutputStream {
/**
* The line end characters.
*/
private static final String NEWLINE = "\r\n";
/**
* The boundary prefix.
*/
private static final String PREFIX = "--";
/**
* The output stream to write to.
*/
private DataOutputStream out = null;
/**
* The multipart boundary string.
*/
private String boundary = null;
/**
* Creates a new <code>MultiPartFormOutputStream</code> object using
* the specified output stream and boundary. The boundary is required
* to be created before using this method, as described in the
* description for the <code>getContentType(String)</code> method.
* The boundary is only checked for <code>null</code> or empty string,
* but it is recommended to be at least 6 characters. (Or use the
* static createBoundary() method to create one.)
*
* @param os the output stream
* @param boundary the boundary
* @see #createBoundary()
* @see #getContentType(String)
*/
public MultiPartFormOutputStream(OutputStream os, String boundary) {
if(os == null) {
throw new IllegalArgumentException("Output stream is required.");
}
if(boundary == null || boundary.length() == 0) {
throw new IllegalArgumentException("Boundary stream is required.");
}
this.out = new DataOutputStream(os);
this.boundary = boundary;
}
/**
* Writes an boolean field value.
*
* @param name the field name (required)
* @param value the field value
* @throws java.io.IOException on input/output errors
*/
public void writeField(String name, boolean value)
throws java.io.IOException {
writeField(name, new Boolean(value).toString());
}
/**
* Writes an double field value.
*
* @param name the field name (required)
* @param value the field value
* @throws java.io.IOException on input/output errors
*/
public void writeField(String name, double value)
throws java.io.IOException {
writeField(name, Double.toString(value));
}
/**
* Writes an float field value.
*
* @param name the field name (required)
* @param value the field value
* @throws java.io.IOException on input/output errors
*/
public void writeField(String name, float value)
throws java.io.IOException {
writeField(name, Float.toString(value));
}
/**
* Writes an long field value.
*
* @param name the field name (required)
* @param value the field value
* @throws java.io.IOException on input/output errors
*/
public void writeField(String name, long value)
throws java.io.IOException {
writeField(name, Long.toString(value));
}
/**
* Writes an int field value.
*
* @param name the field name (required)
* @param value the field value
* @throws java.io.IOException on input/output errors
*/
public void writeField(String name, int value)
throws java.io.IOException {
writeField(name, Integer.toString(value));
}
/**
* Writes an short field value.
*
* @param name the field name (required)
* @param value the field value
* @throws java.io.IOException on input/output errors
*/
public void writeField(String name, short value)
throws java.io.IOException {
writeField(name, Short.toString(value));
}
/**
* Writes an char field value.
*
* @param name the field name (required)
* @param value the field value
* @throws java.io.IOException on input/output errors
*/
public void writeField(String name, char value)
throws java.io.IOException {
writeField(name, new Character(value).toString());
}
/**
* Writes an string field value. If the value is null, an empty string
* is sent ("").
*
* @param name the field name (required)
* @param value the field value
* @throws java.io.IOException on input/output errors
*/
public void writeField(String name, String value)
throws java.io.IOException {
if(name == null) {
throw new IllegalArgumentException("Name cannot be null or empty.");
}
if(value == null) {
value = "";
}
/*
--boundary\r\n
Content-Disposition: form-data; name="<fieldName>"\r\n
\r\n
<value>\r\n
*/
// write boundary
out.writeBytes(PREFIX);
out.writeBytes(boundary);
out.writeBytes(NEWLINE);
// write content header
out.writeBytes("Content-Disposition: form-data; name=\"" + name + "\"");
out.writeBytes(NEWLINE);
out.writeBytes(NEWLINE);
// write content
out.writeBytes(value);
out.writeBytes(NEWLINE);
out.flush();
}
/**
* Writes a file's contents. If the file is null, does not exists, or
* is a directory, a <code>java.lang.IllegalArgumentException</code>
* will be thrown.
*
* @param name the field name
* @param mimeType the file content type (optional, recommended)
* @param file the file (the file must exist)
* @throws java.io.IOException on input/output errors
*/
public void writeFile(String name, String mimeType, File file)
throws java.io.IOException {
if(file == null) {
throw new IllegalArgumentException("File cannot be null.");
}
if(!file.exists()) {
throw new IllegalArgumentException("File does not exist.");
}
if(file.isDirectory()) {
throw new IllegalArgumentException("File cannot be a directory.");
}
writeFile(name, mimeType, file.getCanonicalPath(), new FileInputStream(file));
}
/**
* Writes a input stream's contents. If the input stream is null, a
* <code>java.lang.IllegalArgumentException</code> will be thrown.
*
* @param name the field name
* @param mimeType the file content type (optional, recommended)
* @param fileName the file name (required)
* @param is the input stream
* @throws java.io.IOException on input/output errors
*/
public void writeFile(String name, String mimeType,
String fileName, InputStream is)
throws java.io.IOException {
if(is == null) {
throw new IllegalArgumentException("Input stream cannot be null.");
}
if(fileName == null || fileName.length() == 0) {
throw new IllegalArgumentException("File name cannot be null or empty.");
}
/*
--boundary\r\n
Content-Disposition: form-data; name="<fieldName>"; filename="<filename>"\r\n
Content-Type: <mime-type>\r\n
\r\n
<file-data>\r\n
*/
// write boundary
out.writeBytes(PREFIX);
out.writeBytes(boundary);
out.writeBytes(NEWLINE);
// write content header
out.writeBytes("Content-Disposition: form-data; name=\"" + name + "\"; filename=\"" + fileName + "\"");
out.writeBytes(NEWLINE);
if(mimeType != null) {
out.writeBytes("Content-Type: " + mimeType);
out.writeBytes(NEWLINE);
}
out.writeBytes(NEWLINE);
// write content
byte[] data = new byte[1024];
int r = 0;
while((r = is.read(data, 0, data.length)) != -1) {
out.write(data, 0, r);
}
// close input stream, but ignore any possible exception for it
try {
is.close();
} catch(Exception e) {}
out.writeBytes(NEWLINE);
out.flush();
}
/**
* Writes the given bytes. The bytes are assumed to be the contents
* of a file, and will be sent as such. If the data is null, a
* <code>java.lang.IllegalArgumentException</code> will be thrown.
*
* @param name the field name
* @param mimeType the file content type (optional, recommended)
* @param fileName the file name (required)
* @param data the file data
* @throws java.io.IOException on input/output errors
*/
public void writeFile(String name, String mimeType,
String fileName, byte[] data)
throws java.io.IOException {
if(data == null) {
throw new IllegalArgumentException("Data cannot be null.");
}
if(fileName == null || fileName.length() == 0) {
throw new IllegalArgumentException("File name cannot be null or empty.");
}
/*
--boundary\r\n
Content-Disposition: form-data; name="<fieldName>"; filename="<filename>"\r\n
Content-Type: <mime-type>\r\n
\r\n
<file-data>\r\n
*/
// write boundary
out.writeBytes(PREFIX);
out.writeBytes(boundary);
out.writeBytes(NEWLINE);
// write content header
out.writeBytes("Content-Disposition: form-data; name=\"" + name +
"\"; filename=\"" + fileName + "\"");
out.writeBytes(NEWLINE);
if(mimeType != null) {
out.writeBytes("Content-Type: " + mimeType);
out.writeBytes(NEWLINE);
}
out.writeBytes(NEWLINE);
// write content
out.write(data, 0, data.length);
out.writeBytes(NEWLINE);
out.flush();
}
/**
* Flushes the stream. Actually, this method does nothing, as the only
* write methods are highly specialized and automatically flush.
*
* @throws java.io.IOException on input/output errors
*/
public void flush() throws java.io.IOException {
// out.flush();
}
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