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我在使用 NetBeans IDE 和 Java Swing 构建的打包程序时遇到问题。当项目是从 netbeans 构建时，它会将程序所依赖的所有库复制到文件夹 dist 中名为 lib 的文件夹中，包括我使用的 sqlite4java API。Dist 还包含可执行的 .jar 文件。当文件打开时，正常的 jFrame 打开并且程序运行良好，直到调用 SQLiteConnection。不会返回任何错误，但程序总是无法超过可执行 .jar 文件中的那个点。但是，它在 NetBeans IDE 中运行良好。

该程序显示了一个文本区域，并且使用了一个swing worker 来不断地在文本区域中添加从数据库中获取的新字符串。

代码段中未包含的所有变量均已正确实例化。

这是有问题的代码：

int state = evt.getStateChange();

String timeStamp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(Calendar.getInstance().getTime());

    //gets the item state i.e. pushed or unpushed
    if (evt.getSource() == Record) {
        Displays.setText("");
        Displays.setEditable(false);
        if (worker != null) {
            worker.cancel(true);
        }
        worker = new SwingWorker() {
            @Override
            protected Integer doInBackground()//Perform the required GUI update here.
            {
                try {
                    //x is created to keep track of the amount of 
                    //previously displayed headers so no headers are displayed more than once
                    int x = 0;

                    //while the button is pushed down
                    while (state == evt.SELECTED) {

                        ArrayList<ArrayList<String>> urlnames = new ArrayList<>();
                        System.out.println(timeStamp);

                        Displays.append("reached");
                        SQLiteConnection db = new SQLiteConnection(new File("my file path"));

                        Displays.append("reached2");
                        db.open(true);

                        //sql statement to find headerurls later than the original starttime
                        SQLiteStatement st = db.prepare("SELECT url FROM urls Where datetime(last_visit_time/1000000-11644473600,'unixepoch','localtime') >= \"" + timeStamp + "\" ORDER BY last_visit_time ASC");
                        urlnames.add(new ArrayList<>());

                        try {
                            while (st.step()) {
                                urlnames.get(0).add(st.columnString(0));
                            }

                            urlnames.add(new ArrayList<>());

                            //gathers each header's respective times
                            st = db.prepare("SELECT datetime(last_visit_time/1000000-11644473600,'unixepoch','localtime') as times FROM urls Where times >= \"" + timeStamp + "\" ORDER BY last_visit_time ASC");
                            while (st.step()) {
                                urlnames.get(1).add(st.columnString(0));
                            }

                        } finally {
                            st.dispose();
                        }

                        //ends connection
                        db.dispose();

                        //prints only the recently added headers
                        for (int i = 0; i < urlnames.get(0).size() - x; i++) {
                            System.out.printf(" %s  %s   %s   %s  \n", "Time visited: ", urlnames.get(1).get(x + i), "       website url:", urlnames.get(0).get(x + i));
                            Displays.append("Time visited: " + urlnames.get(1).get(x + i) + " \t website url:" + urlnames.get(0).get(x + i) + " \n");
                        }

                        System.out.println(x);
                        //change x to account for the new size of the headers and waits 3 seconds before running through again
                        x = urlnames.get(0).size();
                        Thread.sleep(2000);
                        urlnames.clear();
                    }

                } catch (Exception ex) {
                }
                return 0;
            }
        };
        worker.execute();//Schedules this SwingWorker for execution on a worker thread.
    }

第一个字符串“Reached”总是附加到文本区域，但第二个字符串“Reached2”永远不会添加。仅当我在 NetBeans 中构建程序并将其打包为包含依赖库的可分发 .jar 文件时，才会出现此问题。该程序在 NetBeans IDE 中运行良好。

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1 回答 1

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您捕获所有异常但不打印它们。改变

} catch (Exception ex) {
}

至 

} catch (Exception ex) {
   ex.printStackTrace();
   Displays.append("exception thrown: " + ex);
}

您可能会看到可以解释问题的错误消息。

“我的文件路径”也应该是绝对路径。当前用户目录可能与 Netbeans 外部的经文不同，并解释了相对路径不起作用。

于 2015-10-02T22:58:40.437 回答