Develop Reference

java: Can't check this string

Can’t convert String into json, and it seems that it will be superfluous for the entire string.
Was thinking maybe json might have helped me out here, but it doesn't seem to give me what I want or I don't know how it will be work.
How I can check the string?
I need to check:
METHOD: GET and URL: http://google.com/
also to check the BODY contains the fields userId, replId and view (no values, only keys)
I was trying to find a way to check that:
if (msg.contains("METHOD: GET") && msg.contains("URL: http://google.com/") && msg.contains("BODY: etc...")) {
System.out.println("ok");
}
It doesn't work. Some values from BODY that are dynamic and that's why for BODY the check won't pass if it’s so hardcoded String. And I guess there're any better ways to do that.
I'd like to have something like:
Assert.assertEquals(
msg,
the expected value for METHOD, which contains GET); // same here for URL: http://google.com/
Assert.assertEquals(
msg,
the expected value for BODY that has userId, replId, and view fields); // or make this assertion for each field separately, such as there is an assertion for the userId field, the same assertions for replId and view
And here's the String:
String msg = "METHOD: GET\n" +
"URL: http://google.com/\n" +
"token: 32Asdd1QQdsdsg$ff\n" +
"code: 200\n" +
"stand: test\n" +
"BODY: {\"userId\":\"11022:7\",\"bdaId\":\"110220\",\"replId\":\"fffDss0400rDF\",\"local\":\"not\",\"ttpm\":\"000\",\"view\":true}";
I can't think of any way to check that. Any ideas?

You can use the java.util.List Interface (of type String) and place the string contents into that list. Then you can use the List#contains() method, for example:
String msg = "METHOD: GET\n" +
"URL: http://google.com/\n" +
"token: 32Asdd1QQdsdsg$ff\n" +
"code: 200\n" +
"stand: test\n" +
"BODY: {\"userId\":\"11022:7\",\"bdaId\":\"110220\",\"replId\":\"fffDss0400rDF\",\"local\":\"not\",\"ttpm\":\"000\",\"view\":true}";
// Split contents of msg into list.
java.util.List<String> list = Arrays.asList(msg.split("\n"));
if (list.contains("METHOD: GET")) {
System.out.println("YUP! Got: --> 'METHOD: GET'");
}
else {
System.out.println("NOPE! Don't have: --> 'METHOD: GET'");
}

I've tried to use Assert:
String[] arr1 = msg.split("\n");
Map<String, String> allFieldsMessage = new HashMap<>();
for (String s : arr1) {
String key = s.trim().split(": ")[0];
String value = s.trim().split(": ")[1];
allFieldsMessage.put(key, value);
}
Assert.assertEquals(
allFieldsMessage.get("METHOD"),
"GET"
);
And the same for URL. But my problem is in BODY part. I thought maybe try to parse this particular part of String into json and then only check the necessary keys.

Create Custom InputFormat of ColumnFamilyInputFormat for cassandra

I am working on a project, using cassandra 1.2, hadoop 1.2
I have created my normal cassandra mapper and reducer, but I want to create my own Input format class, which will read the records from cassandra, and I'll get the desired column's value, by splitting that value using splitting and indexing ,
so, I planned to create custom Format class. but I'm confused and not able to know, how would I make it? What classes are to be extend and implement, and how I will able to fetch the row key, column name, columns value etc.
I have my Mapperclass as follow:
public class MyMapper extends
Mapper<ByteBuffer, SortedMap<ByteBuffer, IColumn>, Text, Text> {
private Text word = new Text();
MyJDBC db = new MyJDBC();
public void map(ByteBuffer key, SortedMap<ByteBuffer, IColumn> columns,
Context context) throws IOException, InterruptedException {
long std_id = Long.parseLong(ByteBufferUtil.string(key));
long newSavePoint = 0;
if (columns.values().isEmpty()) {
System.out.println("EMPTY ITERATOR");
sb.append("column_N/A" + ":" + "N/A" + " , ");
} else {
for (IColumn cell : columns.values()) {
name = ByteBufferUtil.string(cell.name());
String value = null;
if (name.contains("int")) {
value = String.valueOf(ByteBufferUtil.toInt(cell.value()));
} else {
value = ByteBufferUtil.string(cell.value());
}
String[] data = value.toString().split(",");
// if (data[0].equalsIgnoreCase("login")) {
Long[] dif = getDateDiffe(d1, d2);
// logics i want to perform inside my custominput class , rather here, i just want a simple mapper class
if (condition1 && condition2) {
myhits++;
sb.append(":\t " + data[0] + " " + data[2] + " "+ data[1] /* + " " + data[3] */+ "\n");
newSavePoint = d2;
}
}
sb.append("~" + like + "~" + newSavePoint + "~");
word.set(sb.toString().replace("\t", ""));
}
db.setInterval(Long.parseLong(ByteBufferUtil.string(key)), newSavePoint);
db.setHits(Long.parseLong(ByteBufferUtil.string(key)), like + "");
context.write(new Text(ByteBufferUtil.string(key)), word);
}
I want to decrease my Mapper Class logics, and want to perform same calculations on my custom input class.
Please help, i wish for the positive r4esponse from stackies...

You can do the intended task by moving the Mapper logic to your custom input class (as you have indicated already)
I found this nice post which explains a similar problem statement as you have. I think it might solve your problem.

error in dataSearch using berkley DB

I've created a database using Berkley DB that stores N records where a record is a key/value pair. I originally populated it with only 20 records. With 20 records I managed to do a Key Search, and a Data Search (where I search through the database record by record for a data value that matches the string data inputted by the user).
public String dataSearch (String dataInput) {
String foundKey = null;
String foundData = null;
Cursor cursor = null;
try {
cursor = myDb.openCursor(null, null);
DatabaseEntry theKey = new DatabaseEntry();
DatabaseEntry theData = new DatabaseEntry();
while (cursor.getNext(theKey, theData, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
foundKey = new String(theKey.getData(), "UTF-8");
foundData = new String(theData.getData(), "UTF-8");
// this is to see each key - data - inputdata as I was having an issue
System.out.println("KEY: " + foundKey +
"\nDATA: " + foundData +
"\nINPUT_DATA: " + dataInput + "\n\n");
if (foundData.equals(dataInput)) {
System.out.println("-----------------------------------\n\n");
System.out.println("Found record: " + foundKey +
"\nwith data: " + foundData);
System.out.println("\n\n-----------------------------------");
}
}
/* I then close the cursor and catch exceptions and such */
this works fine when I have less than (or equal to) 20 records... but when I use a bigger number I seem to have some funny behaviour. I set the number of records to 1000... the last key/data values to be inserted into the database are:
KEY: zghxnbujnsztazmnrmrlhjsjfeexohxqotjafliiktlptsquncuejcrebaohblfsqazznheurdqbqbxjmyqr
DATA: jzpqaymwwnoqzvxykowdhxvfbuhrsfojivugrmvmybbvurxmdvmrclalzfscmeknyzkqmrcflzdooyupwznvxikermrbicapynwspbbritjyeltywmmslpeuzsmh
I had it print out the last values to be inserted into the database then did a key search on the above key to ensure that the data above was infact the data associated with that key in the database. However, when I do a data search on the data listed above I get no found matching record (whereas the same process found a record when there was 20 records). I looked into it a bit more and got each my data search to print each key/data pair that it returned and found the following result:
KEY: zghxnbujnsztazmnrmrlhjsjfeexohxqotjafliiktlptsquncuejcrebaohblfsqazznheurdqbqbxjmyqrpzlyvnmdlvgyvzhbceeftcqssbeckxkuepxyphsgdzd
DATA: jzpqaymwwnoqzvxykowdhxvfbuhrsfojivugrmvmybbvurxmdvmrclalzfscmeknyzkqmrcflzdooyupwznvxikermrbicapynwspbbritjyeltywmmslpeuzsmhozy
INPUT DATA: jzpqaymwwnoqzvxykowdhxvfbuhrsfojivugrmvmybbvurxmdvmrclalzfscmeknyzkqmrcflzdooyupwznvxikermrbicapynwspbbritjyeltywmmslpeuzsmh
as you can see it seems to have randomly appended some extra bytes to the data value. however if I do a key search these extra bytes don't show up. So I think the problem is in the dataSearch function. The same results occur if I use b+tree or hash.
Any Ideas?
Thanks

After a long time looking at this I realized my error was that I was not reinitializing the theKey & theData variables.
the fix is in the while loop
while (cursor.getNext(theKey, theData, LockMode.DEFAULT) == OperationStatus.SUCCESS) {
foundKey = new String(theKey.getData(), "UTF-8");
foundData = new String(theData.getData(), "UTF-8");
// this is to see each key - data - inputdata as I was having an issue
System.out.println("KEY: " + foundKey +
"\nDATA: " + foundData +
"\nINPUT_DATA: " + dataInput + "\n\n");
if (foundData.equals(dataInput)) {
System.out.println("-----------------------------------\n\n");
System.out.println("Found record: " + foundKey +
"\nwith data: " + foundData);
System.out.println("\n\n-----------------------------------");
}
// THIS IS THE FIX
theKey = new DatabaseEntry();
theData = new DatabaseEntry();
// ----------------------------
}

Dynamically Read Properties file and draw Text boxes in javascript

I have a properties file with all the fields. dynamically I need to draw the text box with fields as read from the properties file and enter values and post it to controller in spring - java !
Example Properties File
name=String
age=int
address=string
How can I do this from java code..

For my idea, I will do it as below:
Using ajax to get fields from property file on server and return a list of field and type of field in a json format (key, value).
Now we have the data of those fields, then we generate them to your form using jquery or javascript.
Submit the form to server to get value.
Step 1 and 2 are quite easy, so I do not post the code; for step 3, you can try the method below to parse the params in query string to a map.
public static Map getMapFromQueryString(String queryString) {
Map returnMap = new HashMap();
StringTokenizer stringTokenizer = new StringTokenizer(queryString, "&");
while (stringTokenizer.hasMoreTokens()) {
String key, value;
String keyAndValue = stringTokenizer.nextToken();
int indexOfEqual = keyAndValue.indexOf("=");
if (indexOfEqual >= 0) {
key = keyAndValue.substring(0, indexOfEqual);
if ((indexOfEqual + 1) < keyAndValue.length()) {
value = keyAndValue.substring(indexOfEqual + 1);
} else {
value = "";
}
} else {
key = keyAndValue;
value = "";
}
if (key.length() > 0) returnMap.put(key, value);
}
return returnMap;
}
Now you can get all the value of dynamic fields on the form.
Hope this solution is helpful for you.

Request header is returning NULL

I have some issue with the code below, req.getHeader() is returning NULL
// The code below returns the expected value
String header = req.getHeader("x-key");
String size = req.getHeader("x-size");
String contentType = req.getContentType();
logger.info("Content-Length: " + req.getContentLength());
logger.info("x-key : " + header);
logger.info("x-size : " + size);
// The value of req.getHeader below is returning NULL
for (Enumeration e = req.getHeaderNames(); e.hasMoreElements();) {
String headerName = (String) e.nextElement();
logger.info("Name = " + headerName + " " + "Value = " + req.getHeader(headerName ));
}
What could be the problem?

Your code looks OK. If getHeader() returns null the header is indeed null, i.e. was not sent by client.
So, first check your client and be sure it sends the header. Second, try to use network sniffer, e.g. Wireshark and record the network activity.
If you need more assistance please post your client's code.

The below is part of the extract from the api docs.
public java.util.Enumeration getHeaderNames()
Some servlet containers do not allow servlets to access headers using this method, in which case this method returns null