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doPut

 
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How do I use doPut- I want to upload a file? I can set the method to PUT and override the doPut?
What do I do beyond it? What params I send and how do I actually upload a file.
Thanks
Sanjay
 
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Hi Sanjay,

You do not have to use PUT method. on your front end (Html form), you should set thses attributes,
enctype="multipart/form-data" method=POST
in your server site, either servlet or JSP (I guess) you parse request to get your file content.
Here is what I did.
/*
* HttpUploader.java
*
* Created on October 27, 2001, 8:42 AM
*/
package gn.utils;
/**
*Java Base implementation of RFC 1867 Form-based File Upload in HTML
*Server side processing java bean
* @author Sunny Liu
* @version 2.1
*/
import java.io.*;
import java.util.*;
import java.util.ArrayList;
import javax.servlet.*;
import javax.servlet.http.*;

public class HttpUploader implements Serializable
{
HttpServletRequest request;
HttpServletResponse response;

public HttpUploader (HttpServletRequest request, HttpServletResponse response)
{
init(request, response);
}

public void init(HttpServletRequest request, HttpServletResponse response)
{
this.request = request;
this.response = response;
try{
parserRequest();
}catch(Exception ex){
ex.printStackTrace();
}
}

public String getParameter(String key)
{
String retVal = null;
String[] rets = getParameterValues(key);
if ( rets != null && rets.length >0 ) retVal = rets[0];
return retVal;
}

public String[] getParameterValues(String key)
{
String[] retVal = null;
Object obj = parameters.get(key);
if ( obj != null ) retVal = (String[])obj;
return retVal;
}

public Enumeration getParameterNames()
{
return parameters.keys();
}

public byte[] getFileContent(String key)
{
byte[] retVal = null;
String filename = getParameter(key);
if ( filename != null && files.containsKey(filename)){
retVal = (byte[])files.get(filename);
}
return retVal;
}

public String getFileContentType(String key)
{
String retVal = "application/octet-stream";
String filename = getParameter(key);
if ( filename != null && contentTypes.containsKey(filename)){
retVal = (String)contentTypes.get(filename);
}
return retVal;
}


//maximium allowed upload file size in total 100k == 1MB
private final static long MAX_UPLOAD_SIZE = 1000*1024;
private Hashtable parameters = new Hashtable();
private Hashtable files = new Hashtable();
private Hashtable contentTypes = new Hashtable();

private void parserRequest() throws java.lang.Exception
{

int contentSize = request.getContentLength();
//make sure uploaded size not over limited size;
if ( contentSize <= MAX_UPLOAD_SIZE ){
doParse();
}else{
throw new Exception("File size over limited exception at HttpUploader.");
}
}

private String currFieldName = null;
private String currFileName = null;
private void doParse() throws java.lang.Exception
{
ServletInputStream in = request.getInputStream();
int length = request.getContentLength();
String boundary = null;
String EOR = null;


boolean isEOR = false;
String CRLF = "\r\n";
int readLineLength = 0;
int dataReaded = 0;
byte[] buffer = new byte[length];

//Read boundary line
readLineLength = in.readLine(buffer, 0, length);
if (readLineLength > 0 ){
boundary = new String(buffer, 0, readLineLength);
boundary = boundary.trim();
EOR = boundary + "--";
dataReaded += readLineLength;
}else{
//Should never happen;
throw new java.io.IOException("No data uploaded exception.");
}
//read Each field data;
buffer = new byte[length-dataReaded];

boolean fieldStarted = false;
boolean foundFieldHead = false;
boolean foundCRLF = false;
boolean fieldEnd = false;
boolean isFile = false;

ByteArrayOutputStream temp = new ByteArrayOutputStream();

while ( (readLineLength = in.readLine(buffer, 0, buffer.length)) > 0 )
{

String data = new String(buffer, 0, readLineLength);
dataReaded += readLineLength;
if ( data.trim().startsWith("Content-Disposition:") && !fieldStarted ){
fieldStarted = true;
fieldEnd = false;
parserFieldHeader(data);
}else if (data.trim().startsWith("Content-Type:") && !foundCRLF ){
isFile = true;
parserContentType(data);
}else if (data.equals(CRLF) && !foundCRLF && fieldStarted && !fieldEnd ){
temp = new ByteArrayOutputStream();
foundCRLF = true;
}else if (data.trim().equals(boundary) || data.trim().equals(EOR) ){
if ( isFile ){
if ( currFileName != null ) files.put(currFileName, temp.toByteArray());
}else{
String[] values = null; //values.add(temp.toString());
if( currFieldName != null && parameters.containsKey(currFieldName) ){
String[] oldValues = (String[])parameters.get(currFieldName);
values = new String[oldValues.length + 1];
for (int i = 0; i < oldValues.length; i++) {
values[i] = oldValues[i];
}
values[oldValues.length] = temp.toString();
}else if (currFieldName != null && !parameters.containsKey(currFieldName)){
values = new String[1];
values[0] = temp.toString();
}
if ( currFieldName != null && values != null ) parameters.put(currFieldName, values);
}
currFieldName = null;
currFileName = null;
isFile = false;
foundCRLF = false;
fieldStarted = false;
fieldEnd = true;
}else{
temp.write(buffer, 0, readLineLength);
}

buffer = new byte[length-dataReaded];

}


}

private void parserFieldHeader(String data) throws java.lang.Exception
{

String fieldName = null;
String fileName = null;

int nameIndex = data.indexOf("name=\"");
int nameEnd = data.indexOf("\"", nameIndex+6);
int filenameIndex = data.indexOf("filename=\"");
int fendIndex = data.indexOf("\"", filenameIndex + 10);
if ( nameIndex != -1 && nameEnd > nameIndex ){
fieldName = data.substring(nameIndex+6, nameEnd);
currFieldName = fieldName;
}
if ( filenameIndex != -1 && fendIndex > filenameIndex ){
fileName = data.substring(filenameIndex + 10, fendIndex);
int dos = fileName.lastIndexOf("\\");
int unix = fileName.lastIndexOf("/");
if ( dos != -1 ){
fileName = fileName.substring(dos+1);
}else if (unix != -1 ){
fileName = fileName.substring(unix+1);
}
currFileName = fileName;
}
String[] values = null;
if (parameters.containsKey(fieldName) && fileName != null )
{
String[] oldValues = (String[])parameters.get(fieldName);
values = new String[oldValues.length + 1];
for (int i = 0; i < oldValues.length; i++) {
values[i] = oldValues[i];
}
values[oldValues.length] = fileName;
}else if( !parameters.containsKey(fieldName) && fileName != null){
values = new String[1];
values[0] = fileName;
}
if ( fieldName != null && values != null ) parameters.put(fieldName, values);

}

private void parserContentType(String data)
{
int index = data.indexOf(":");
String type = "application/octet-stream";
if ( index != -1 ){
type = data.substring(index + 1 );
type = type.trim();
}
if ( currFileName != null ) contentTypes.put(currFileName, type);
}
}
 
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