Convert a String to an ArrayList

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Hi,

I was trying to pass an array list of hashmaps via the glassfish webservice, but i kept getting a "class java.util.hashmap nor any of its super class is known to this context"

When I added a toString method to it, i get the values like this

Java

[{id=childNode1, description=This is the google link, type=child, href=www.google.com}, {id=childNode2, description=This is the yahoo link, type=child, href=www.yahoo.com}]

can I from a jsp page compile this to an Arraylist of hashmaps?

Please post if i am unclear

Posted 23-Nov-11 2:28am

boude

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TorstenH. · Answer 1 · 2011-11-23T02:46:00

Solution 1

Make it an Array with key/value pairs. Shouldn't cause to much headaches.

Posted 23-Nov-11 2:46am

TorstenH.

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boude 23-Nov-11 8:52am

when i create the list on the server side, i append a hashmap to the arraylist.
This is the backend code

ArrayList list = new ArrayList();

// Use this code to add nodes to the map
System.out.println("Current Node is: " + currentNode);
if (currentNode == 1) {
Map map = new HashMap();
map.put("type", "child");
map.put("id", "childNode1");
map.put("href", "www.google.com");
map.put("description", "This is the google link");
list.add(map);
// End with creating Node

map = new HashMap();
map.put("type", "child");
map.put("id", "childNode2");
map.put("href", "www.yahoo.com");
map.put("description", "This is the yahoo link");
list.add(map);
System.out.println("Size of list is: " + list.size());
System.out.println("Sending back the array List");
}

TorstenH. 23-Nov-11 9:24am

which part is not understandable? don't trick yourself, make it an Array of Objects. The Object is pretty simple, contains 2 Strings.

Can't get simpler.

boude · Answer 2 · 2011-11-30T23:28:00

Ok. So this is what i came up with to get my values. But now i must use the regex to replace the Square brackes that is created in the string. Is there a way to remove all the Square brackets([/]) only? and not the other nonealphanumeric characters

JavaScript

try {
    webservice.CalculatorService service = new webservice.CalculatorService();
    webservice.Calculator port = service.getCalculatorPort();
    Integer nodeType;
    String[] nodeData = result.split(",");
    ArrayList finalList = new ArrayList();
    ArrayList list = new ArrayList();
    int j = 0;
    for (int i = 0; i <= nodeData.length; i++) {
        if (j < 4) {
            j++;
            if (nodeData[i].contains(".")) {
                list.add(nodeData[i]);
            } else {
           String data = nodeData[i].replaceAll("[^\\p{L}]", " ");
                list.add(data);
            }
        } else {
            j = 0;
            i--;
            out.println("<li id="" + list.get(1) + ""><a href="http://" + list.get(2).toString().trim() + "" target="basefrm">" + list.get(3) + "</a></li>");
            list.clear();
        }
    }
} catch (Exception ex) {
    //out.println("Error " + ex);
}

TorstenH. · Answer 3 · 2011-12-01T01:10:00

holy s***.
That is creepy, sorry top say it so clear, but it is.

Let me set up a new answer to make the code-highlighting enabled:

You've got a fine HashMap object with Keys and Values.

Now imagine this HashMap to be an Arraylist of Objects with Key/Value pairs - let's call the Object "KeyValue":

Java

import java.io.Serializable;

public class KeyValue implements Serializable{
	private static final long serialVersionUID = 1L;
	
	private final String strKey;
	private final String strValue;
	
	public KeyValue(String strKey, String strValue){
		this.strKey = strKey;
		this.strValue = strValue;
	}

	public String getKey() {
		return strKey;
	}

	public String getValue() {
		return strValue;
	}

}

Then you'll init a ArrayList and put all HashMap Entries into that ArrayList:

Java

HashMap<string,> oMap = new HashMap<string,>();

/* fancy code */

ArrayList<keyvalue> oList = new ArrayList<keyvalue>();
for (String strKey : oMap.keySet()) {
	oList.add(new KeyValue(strKey, oMap.get(strKey)));
}

/* fancy code */
</keyvalue></keyvalue>

Now that ArrayList is filled with your Objects. You can send that ArrayList to the client, and as the client knows the Object too, he should be able to retrieve the data.

boude · Answer 4 · 2011-12-02T00:23:00

Did all the arrayList and things on the backend and set the response type to a string. I then added the code on the jsp page and it works wonders

JavaScript

java.lang.String result = port.treeList(nodeType);
String[] items = result.split(",");
for (int i = 0; i < items.length; i++) {
    String item = items[i].toString().replace("[", "").replace("]", "");
    out.println(item);
}

Convert a String to an ArrayList

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