将方法移动到 SwingWorker

Question

我正在开发一个分析 DNA 的程序。该程序的主要工作是在一个方法中，接收某种文件类型，解析文件并将其转换为字符串，然后解析字符串以将其分割成段。然后，它在新的JFrame 上的JTable 中返回分析结果。

public  JTable readFile(File file) throws IOException{
    BufferedReader in = new BufferedReader(new FileReader(file));
    String line;
    String result = "";
    while((line=in.readLine())!=null) {
       if(!line.startsWith(">")) {
              result = result + line;
               }            
    }       

    Sequence sequence = new Sequence("Unspecified", result);
    ArrayList<Contig> contigs = sequence.getReadingFrames();

    String [] columnNames = {"Position", "Frame", "Sequence"};

     Object[][] data = new Object[contigs.size()][3];
     int j = 0;
    for (int i = 0; i <= contigs.size() && j < 3; i++){
        if (i == contigs.size()){
            j++;
            i = -1;
        }
        else if (j == 0){
            data[i][j] = Integer.toString(contigs.get(i).getStartPosition());   
        }
        else if (j == 1){
            data[i][j] = Integer.toString(contigs.get(i).getReadingFrame());
        }
        else if (j == 2){
            data[i][j] = contigs.get(i).getSequence();
        }
    }
    JTable seqTable = new JTable(data, columnNames);
    in.close();
    return seqTable;
}

我应该如何将其移至SwingWorker？我尝试了复制、粘贴和编辑，但整个过程只返回空结果。

Answer 1

我实际上有一个与“My-Name-Is”非常相似的答案，尽管我对其进行了很多简化以尝试显示执行流程，而不是迷失在细节中。

基本上，如果“整个事情只是返回空结果”，我想你可能搞砸了从后台线程到 GUI 线程的切换。仔细检查您的done() 方法，以确保您正确调用get()。

还请记住，Swing 不是线程安全的，所有 GUI 组件（即您的 JTable）都必须在 EDT 上构建，在这种情况下，这意味着在 done() 方法内，而不是在后台线程内。

class TableBuilder extends SwingWorker<Object[][], Void> {
   private final String [] columnNames = {"Position", "Frame", "Sequence"};

   @Override
   public Object[][] doInBackground() throws Exception {
      // read your file, and build your data object...
      Object[][] data = new Object[someSize()][3];
      // then return it to the EDT ...
      return data;
   }
   @Override
   public void done() {
      // now on the EDT, build your GUI components, and 
      // update the GUI as needed.
      try {
         Object[][] data = get();
         JTable seqTable = new JTable(data, columnNames);
         // add your seqTable to the gui here...
      } catch (InterruptedException | ExecutionException ex) {
         // exit
      }
   }
}

Answer 2

你至少有三个选择，你可以...

使用publish/process 填充预先存在的TableModel...

public class TableBuilder extends SwingWorker<Object[][], Object[]> {

    private DefaultTableModel tableModel;

    public TableBuilder(DefaultTableModel tableModel) {
        this.tableModel = tableModel;
    }

    @Override
    protected Object[][] doInBackground() throws Exception {
        try (BufferedReader in = new BufferedReader(new FileReader(file))) {
            String line;
            String result = "";
            while ((line = in.readLine()) != null) {
                if (!line.startsWith(">")) {
                    result = result + line;
                }
            }

            Sequence sequence = new Sequence("Unspecified", result);
            ArrayList<Contig> contigs = sequence.getReadingFrames();

            Object[][] data = new Object[contigs.size()][3];
            int j = 0;
            for (int i = 0; i <= contigs.size() && j < 3; i++) {
                if (i == contigs.size()) {
                    j++;
                    i = -1;
                } else if (j == 0) {
                    data[i][j] = Integer.toString(contigs.get(i).getStartPosition());
                } else if (j == 1) {
                    data[i][j] = Integer.toString(contigs.get(i).getReadingFrame());
                } else if (j == 2) {
                    data[i][j] = contigs.get(i).getSequence();
                }
                publish(data[i]);
            }
        }
        return data;
    }

    @Override
    protected void process(List<Object[]> chunks) {
        for (Object[] row : chunks) {
            tableModel.addRow(row);
        }
    }

}

在doInBackground 方法中构建TableModel...

public class TableBuilder extends SwingWorker<TableModel, Void> {

    private JTable table;

    public TableBuilder(JTable table) {
        this.table = table;
    }

    @Override
    protected TableModel doInBackground() throws Exception {
        DefaultTableModel tableModel;
        try (BufferedReader in = new BufferedReader(new FileReader(file))) {
            String line;
            String result = "";
            while ((line = in.readLine()) != null) {
                if (!line.startsWith(">")) {
                    result = result + line;
                }
            }

            Sequence sequence = new Sequence("Unspecified", result);
            ArrayList<Contig> contigs = sequence.getReadingFrames();

            String[] columnNames = {"Position", "Frame", "Sequence"};

            Object[][] data = new Object[contigs.size()][3];
            int j = 0;
            for (int i = 0; i <= contigs.size() && j < 3; i++) {
                if (i == contigs.size()) {
                    j++;
                    i = -1;
                } else if (j == 0) {
                    data[i][j] = Integer.toString(contigs.get(i).getStartPosition());
                } else if (j == 1) {
                    data[i][j] = Integer.toString(contigs.get(i).getReadingFrame());
                } else if (j == 2) {
                    data[i][j] = contigs.get(i).getSequence();
                }
            }
            tableModel = new DefaultTableModel(data, columnNames);
        }
        return tableModel;
    }

    @Override
    protected void done() {
        try {
            TableModel model = get();
            if (model != null) {
                table.setModel(model);
            } else {
                // Handle possible null case...
            }
        } catch (InterruptedException | ExecutionException ex) {
            ex.printStackTrace();
        }
    }

}

返回构造TableModel所需的数据

public class TableBuilder extends SwingWorker<Object[][], Void> {

    private JTable table;

    public TableBuilder(JTable table) {
        this.table = table;
    }

    @Override
    protected Object[][] doInBackground() throws Exception {
        Object[][] data = null;
        try (BufferedReader in = new BufferedReader(new FileReader(file))) {
            String line;
            String result = "";
            while ((line = in.readLine()) != null) {
                if (!line.startsWith(">")) {
                    result = result + line;
                }
            }

            Sequence sequence = new Sequence("Unspecified", result);
            ArrayList<Contig> contigs = sequence.getReadingFrames();

            data = new Object[contigs.size()][3];
            int j = 0;
            for (int i = 0; i <= contigs.size() && j < 3; i++) {
                if (i == contigs.size()) {
                    j++;
                    i = -1;
                } else if (j == 0) {
                    data[i][j] = Integer.toString(contigs.get(i).getStartPosition());
                } else if (j == 1) {
                    data[i][j] = Integer.toString(contigs.get(i).getReadingFrame());
                } else if (j == 2) {
                    data[i][j] = contigs.get(i).getSequence();
                }
            }
        }
        return data;
    }

    @Override
    protected void done() {
        try {
            Object[][] rows = get();
            if (rows != null) {
                String[] columnNames = {"Position", "Frame", "Sequence"};
                TableModel tableModel = new DefaultTableModel(data, columnNames);
                table.setModel(model);
            } else {
                // Handle possible null case...
            }
        } catch (InterruptedException | ExecutionException ex) {
            ex.printStackTrace();
        }
    }

}

Answer 3

试试这个。由于缺少依赖项，源未经过测试。您只需要找到一种方法来更新您的JTable。我建议使用TableModel 的实例创建CustomSwingWorker，然后在方法中更新它：protected void done()

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.concurrent.ExecutionException;

import javax.sound.midi.Sequence;
import javax.swing.JTable;
import javax.swing.SwingWorker;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;

public class CustomSwingWorker extends SwingWorker<TableModel, Void> {

    private File file;
    private JTable table;

    public CustomSwingWorker(final JTable table, final File file) {
        this.table = table;
        this.file = file;
    }

    @Override
    protected TableModel doInBackground() throws Exception {
        BufferedReader in = new BufferedReader(new FileReader(file));
        String line;
        String result = "";
        while ((line = in.readLine()) != null) {
            if (!line.startsWith(">")) {
                result = result + line;
            }
        }

        Sequence sequence = new Sequence("Unspecified", result);
        ArrayList<Contig> contigs = sequence.getReadingFrames();

        String [] columnNames = {"Position", "Frame", "Sequence"};

        Object[][] data = new Object[contigs.size()][3];
        int j = 0;
        for (int i = 0; i <= contigs.size() && j < 3; i++) {
            if (i == contigs.size()) {
                j++;
                i = -1;
            } else if (j == 0) {
                data[i][j] = Integer
                        .toString(contigs.get(i).getStartPosition());
            } else if (j == 1) {
                data[i][j] = Integer.toString(contigs.get(i).getReadingFrame());
            } else if (j == 2) {
                data[i][j] = contigs.get(i).getSequence();
            }
        }

        in.close();
        return new DefaultTableModel(data, columnNames);
    }

    protected void done() {
        try {
            this.table.setModel(this.get());
        } catch (Exception ignore) {
            // Simply ignore it ...
        }
    }
}