some exception in stacktrace?
2011/3/25 Ankit <[email protected]>
> Hi All,
>
> I am new to the GWT looking for some help in the following code.
>
> Basically want to iterate over some json data and display it in a cell
> Table.
>
> Here is how it looks like.
>
> (1) JsonIntegrate.gwt.xml
>
> <?xml version="1.0" encoding="UTF-8"?>
> <module rename-to='jsonintegrate'>
> <!-- Inherit the core Web Toolkit stuff. -->
> <inherits name='com.google.gwt.user.User'/>
>
> <!-- Inherit the default GWT style sheet. You can change -->
> <!-- the theme of your GWT application by uncommenting -->
> <!-- any one of the following lines. -->
> <inherits name='com.google.gwt.user.theme.standard.Standard'/>
> <!-- <inherits name='com.google.gwt.user.theme.chrome.Chrome'/> -->
> <!-- <inherits name='com.google.gwt.user.theme.dark.Dark'/> -->
>
> <!-- Other module inherits -->
> <inherits name="com.google.gwt.http.HTTP" />
>
> <!-- Specify the app entry point class. -->
> <entry-point class='com.symantec.mmavis.gwt.client.JsonIntegrate'/>
>
> <!-- Specify the paths for translatable code -->
> <source path='client'/>
> <source path='shared'/>
>
> </module>
>
> (2) Client.
>
> JsonIntegrate.java
>
> package com.symantec.mmavis.gwt.client;
>
> import java.util.ArrayList;
> import java.util.Collections;
> import java.util.Comparator;
> import java.util.List;
>
> import com.google.gwt.core.client.EntryPoint;
> import com.google.gwt.core.client.GWT;
> import com.google.gwt.core.client.JsArray;
> import com.google.gwt.http.client.Request;
> import com.google.gwt.http.client.RequestBuilder;
> import com.google.gwt.http.client.RequestCallback;
> import com.google.gwt.http.client.RequestException;
> import com.google.gwt.http.client.Response;
> import com.google.gwt.http.client.URL;
> import com.google.gwt.user.cellview.client.CellTable;
> import com.google.gwt.user.cellview.client.ColumnSortList;
> import com.google.gwt.user.cellview.client.TextColumn;
> import
> com.google.gwt.user.cellview.client.ColumnSortEvent.AsyncHandler;
> import com.google.gwt.user.client.Timer;
> import com.google.gwt.user.client.ui.RootPanel;
> import com.google.gwt.view.client.AsyncDataProvider;
> import com.google.gwt.view.client.HasData;
> import com.google.gwt.view.client.ListDataProvider;
> import com.google.gwt.view.client.Range;
>
> /**
> * Entry point classes define <code>onModuleLoad()</code>.
> */
> public class JsonIntegrate implements EntryPoint {
>
> // The list of data to display.
>
> //ResultData rs1 = new ResultData();
>
> //private static List<Contact> CONTACTS = Arrays.asList(new
> Contact("John", "123 Fourth Road"), new Contact("Mary", "222 Lancer
> Lane"), new Contact("Zander", "94 Road Street"));
> private static final String JSON_URL = GWT.getModuleBaseURL() +
> "search?q=5";
>
> private ListDataProvider<SearchResult> dataProvider = new
> ListDataProvider<SearchResult>();
>
> private final ArrayList<SearchResult> contactList = new
> ArrayList<SearchResult>();
>
> public void onModuleLoad() {
>
> // Create a CellTable.
> final CellTable<SearchResult> table = new
> CellTable<SearchResult>();
>
> // Create ordernumber column.
> final TextColumn<SearchResult> orderColumn = new
> TextColumn<SearchResult>() {
> @Override
> public String getValue(final SearchResult contact) {
> return contact.getOrdernumber();
> }
> };
>
> // Make the name column sortable.
> orderColumn.setSortable(true);
>
> // Create status column.
> final TextColumn<SearchResult> statusColumn = new
> TextColumn<SearchResult>() {
> @Override
> public String getValue(final SearchResult contact) {
> return contact.getStatus();
> }
> };
> statusColumn.setSortable(true);
>
> // Create View Detail Column
> TextColumn<SearchResult> viewDetailColumn = new
> TextColumn<SearchResult>() {
>
> @Override
> public String getValue(SearchResult contact) {
> return contact.getDetail();
> }
> };
> viewDetailColumn.setSortable(true);
>
> // Add the columns.
> table.addColumn(orderColumn, "Order Number");
> table.addColumn(statusColumn, "Status");
> table.addColumn(viewDetailColumn, "View Detail");
>
> this.getJsonData();
>
> // Set the total row count. You might send an RPC request to
> determine the
> // total row count.
> table.setRowCount(contactList.size(), true);
>
> // Set the range to display. In this case, our visible range
> is
> smaller than
> // the data set.
> table.setVisibleRange(0, contactList.size());
>
> // Create a data provider.
> final AsyncDataProvider<SearchResult> dataProvider = new
> AsyncDataProvider<SearchResult>() {
> @Override
> protected void onRangeChanged(final
> HasData<SearchResult> display)
> {
> final Range range =
> display.getVisibleRange();
>
> // Get the ColumnSortInfo from the table.
> final ColumnSortList sortList =
> table.getColumnSortList();
>
> // This timer is here to illustrate the
> asynchronous nature of
> this data
> // provider. In practice, you would use an
> asynchronous RPC call
> to
> // request data in the specified range.
> new Timer() {
> @Override
> public void run() {
> final int start =
> range.getStart();
> final int end = start +
> range.getLength();
> // This sorting code is here
> so the example works. In practice,
> you
> // would sort on the server.
>
> Collections.sort(contactList, new Comparator<SearchResult>() {
>
> @Override
> public int
> compare(final SearchResult o1, final SearchResult
> o2) {
> if (o1 ==
> o2) {
>
> return 0;
> }
>
> // Compare
> the name columns.
> int diff =
> -1;
> if (o1 !=
> null) {
> diff
> = (o2 != null) ?
> o1.getOrdernumber().compareTo(o2.getOrdernumber()) : 1;
> }
> return
> sortList.get(0).isAscending() ? diff : -diff;
> }
>
> });
> final List<SearchResult>
> dataInRange =
> contactList.subList(start, end);
>
> // Push the data back into
> the list.
> table.setRowData(start,
> dataInRange);
> }
> }.schedule(2000);
> }
> };
>
> // Connect the list to the data provider.
> dataProvider.addDataDisplay(table);
>
> // Add a ColumnSortEvent.AsyncHandler to connect sorting to
> the
> // AsyncDataPRrovider.
> final AsyncHandler columnSortHandler = new
> AsyncHandler(table);
> table.addColumnSortHandler(columnSortHandler);
>
> // We know that the data is sorted alphabetically by
> default.
> table.getColumnSortList().push(orderColumn);
>
> // Add it to the root panel.
> RootPanel.get().add(table);
> }
>
>
>
> private void getJsonData() {
>
> String url = JSON_URL;
>
> url = URL.encode(url);
>
> // Send request to server and catch any errors.
> final RequestBuilder builder = new
> RequestBuilder(RequestBuilder.GET, url);
>
> try {
> final Request request = builder.sendRequest(null,
> new
> RequestCallback() {
> public void onError(final Request request,
> final Throwable
> exception) {
> System.out.println("error");
> }
>
> public void onResponseReceived(final Request
> request, final
> Response response) {
> if (200 == response.getStatusCode())
> {
>
> loadData(asArrayOfResultData(response.getText()));
> } else {
> System.out.println("error");
> }
> }
> });
> } catch (final RequestException e) {
> System.out.println("error");
> }
>
> }
>
> /**
> * Update the Price and Change fields all the rows in the stock
> table.
> *
> * @param prices Stock data for all rows.
> */
> private void loadData(final JsArray<ResultData> resultData) {
>
> for (int i = 0; i < resultData.length(); i++) {
>
> ResultData res = resultData.get(i);
>
> SearchResult c = new
> SearchResult(res.getOrdernumber(),
> res.getStatus(), res.getDetail());
> contactList.add(c);
> }
>
> // Display timestamp showing last refresh.
> //this.lastUpdatedLabel.setText("Last update : " +
> DateTimeFormat.getMediumDateTimeFormat().format(new Date()));
>
> // Clear any errors.
> //this.errorMsgLabel.setVisible(false);
>
> }
>
> /**
> * Convert the string of JSON into JavaScript object.
> */
> private final native JsArray<ResultData> asArrayOfResultData(String
> json) /*-{
> return eval(json);
> }-*/;
>
> }
>
> (3) Server
>
> package com.symantec.mmavis.gwt.server;
>
> import java.io.IOException;
> import java.io.PrintWriter;
>
> import javax.servlet.ServletException;
> import javax.servlet.http.HttpServlet;
> import javax.servlet.http.HttpServletRequest;
> import javax.servlet.http.HttpServletResponse;
>
> public class JsonResultData extends HttpServlet {
>
> private static final long serialVersionUID = 1855404725167762932L;
>
> @Override
> protected void doGet(final HttpServletRequest req, final
> HttpServletResponse resp) throws ServletException, IOException {
>
> // final Random rnd = new Random();
>
> final Result result_1 = new Result("1001", "Valid", "View
> Detail
> 1");
> final Result result_2 = new Result("1002", "Pending", "View
> Detail
> 2");
> final Result result_3 = new Result("1003", "Revoked", "View
> Detail
> 3");
> final Result result_4 = new Result("1004", "Revoked", "View
> Detail
> 4");
> final Result result_5 = new Result("1005", "Valid", "View
> Detail
> 5");
> final Result result_6 = new Result("1006", "Pending", "View
> Detail
> 6");
> final Result result_7 = new Result("1007", "Valid", "View
> Detail
> 7");
> final Result result_8 = new Result("1008", "Valid", "View
> Detail
> 8");
> final Result result_9 = new Result("1009", "Revoked", "View
> Detail
> 9");
> final Result result_10 = new Result("1010", "Valid", "View
> Detail
> 10");
>
> final Result[] arrayResult = { result_1, result_2, result_3,
> result_4, result_5, result_6, result_7, result_8, result_9,
> result_10 };
>
> final PrintWriter out = resp.getWriter();
> out.println('[');
> final int count = Integer.valueOf(req.getParameter("q"));
>
> for (int i = 0; i < count; i++) {
>
> out.println(" {");
> out.print(" \"ordernumber\": \"");
> out.print(arrayResult[i].getOrdernumber());
> out.println("\",");
> out.print(" \"status\": \"");
> out.print(arrayResult[i].getStatus());
> out.println("\",");
> out.print(" \"detail\": \"");
> out.print(arrayResult[i].getDetail());
> out.println("\"");
> out.println("}, ");
>
> }
> out.println(']');
> out.flush();
> }
> }
>
> So basically server side we have some json being generated:
>
> http://127.0.0.1:8888/jsonintegrate/search?q=8
>
> When load this page:
> http://127.0.0.1:8888/JsonIntegrate.html?gwt.codesvr=127.0.0.1:9997
> it only loads up the header, the data is not visible..can somebody
> please help ??
>
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