Java ArrayList into Name value pair

Question

In a java class, am using an arraylist say reports containing list of all the reports which have reportid, reportname, reporttype etc which i want to add into NameValuePair and send a Http postmethod call to a particular url.

I want to add the arraylists - reportname into name value pair(org.apache.commons.httpclient.NameValuePair) and then use the http client post method to submit the name value pair data to a particular url.

Here is my name value pair

if (validateRequest()) {
        NameValuePair[] data = {
            new NameValuePair("first_name", firstName),
            new NameValuePair("last_name", lastName),
            new NameValuePair("email", mvrUser.getEmail()),
            new NameValuePair("organization", mvrUser.getOrganization()),
            new NameValuePair("phone", mvrUser.getPhone()),
            new NameValuePair("website", mvrUser.getWebsite()),
            new NameValuePair("city", mvrUser.getCity()),
            new NameValuePair("state", mvrUser.getState()),
            new NameValuePair("country", mvrUser.getCountry()),
            new NameValuePair(**"report(s)", reports**.)
        };

please suggest me how to add the reports arraylist reportname into reports field of NameValuePair.

-- thanks

@ adarsh can I use with generics something like this?

reportname = "";
for (GSReport report : reports) {
        reportname = reportname + report.getReportName();
        reportname += ",";
    }

and then add in namevalue pair as

new NameValuePair("report(s)", reportname)

Of course you can but I only used the indexed for loop to remove the trailing | delimiter. I showed you string concatenation approach for simplicity. I strongly recommend you change to StringBuilder if you have many items in the list. — adarshr
– adarshr, Commented Jan 5, 2012 at 10:51
For forming a delimited string list from an arraylist, just use org.apache.commons.lang.StringUtils.join(Collection, char).. From the apache common lang project. Also, make sure you choose a delimiter that is not being used in any of the strings in the reports list. — sethu
– sethu, Commented Jan 5, 2012 at 11:26

Jitendra kumar jha · Accepted Answer · 2012-01-05 09:57:45Z

1

for name value pair use map like things... eg. Hastable(it is synchronized) , u can use other implementation of Map which are not synchronized.

answered Jan 5, 2012 at 9:57

Jitendra kumar jha

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Hamdi Douss · Accepted Answer · 2012-01-05 10:43:34Z

1

I suggest to serialize your reports ArrayList into a JSON formatted String.

new NameValuePair("reports", reportsAsJson)

You can build your reportsAsJson variable using any of the JSON serialization libraries (like the one at http://json.org/java/). It will have approximatively this format :

reportsAsJson = "[{reportid:'1',reportname:'First Report',reporttype:'Type 1'}, {reportid:'2',reportname:'Seond Report',reporttype:'Type 2'}]";

answered Jan 5, 2012 at 10:43

Hamdi Douss

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adarshr · Accepted Answer · 2012-01-05 10:01:37Z

0

Well, you cannot do that. NameValuePair takes in String arguments in the constructor. It makes sense as it is used for HTTP POST.

What you can do is come up with a way to serialize the Report object into String and send this string as a string parameter. One way of doing this maybe is to delimit the parameters of the Report class.

reports=reportName1|reportName2|reportName3

Assuming reports is your ArrayList,

String reportsStr = "";

for(int i = 0; i < reports.size(); i++) {
    reportStr += reportName;
    if(i != reports.size() - 1) {
        reportsStr += "|";
    }
}

NameValuePair nvPair = new NameValuePair("reports", reportsStr);

answered Jan 5, 2012 at 10:01

adarshr

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