swt如何实现导入指定文件夹下的文件？我做bs不会 cs

Question

如题

Answer 1

就是shell里边加一个按牛，可以浏览本地文件，确认后可以把地址存在text里边，然后读进来

Answer 2

读取的都是2进制文件，然后转换成txt文件输出来

Answer 3

就是说要两个选择路径用的按扭，如果哪位能把读取2进制文件，然后转换成txt文件输出来的代码写下来，感激不尽

Answer 4

只有三个要点:
1,使用org.eclipse.swt.widgets.FileDialog选取文件
2,FileInputStream读文件
3,org.eclipse.swt.custom.StyledText(当然了,其他的控件也OK)输出文件代码:
package cn.com.swt;import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;public class WriteFileAfterRead { public void open() {
final Shell shell = new Shell(SWT.CLOSE);
shell.setLayout(new FillLayout()); Composite composite = new Composite(shell, SWT.NONE);
composite.setLayout(new GridLayout(2, false)); Button referBtn = new Button(composite, SWT.NONE);// use to open a file dialog
referBtn.setText("Refer"); final StyledText outText = new StyledText(composite, SWT.MULTI
| SWT.WRAP);// use to display file content
outText.setLayoutData(new GridData(GridData.FILL_BOTH));
referBtn.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent arg0) {
// TODO Auto-generated method stub
FileDialog fileDialog = new FileDialog(shell);
String fileIn = fileDialog.open();// get selected file path // read file content with FileInputStream,output content to screen
if (null != fileIn) {
FileInputStream fileInputStream = null;
try {
fileInputStream = new FileInputStream(fileIn);
byte[] bufferBytes = new byte[256];
StringBuffer buffer = new StringBuffer();
while ((fileInputStream.read(bufferBytes)) != -1) {
buffer.append(new String(bufferBytes));
}
outText.setText(buffer.toString());
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
fileInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}); shell.setSize(600, 400);
shell.setText("Read File");
shell.layout();
shell.open();
Display display = Display.getDefault();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
} public static void main(String[] args) {
new WriteFileAfterRead().open();
}
}

Answer 5

楼上的代码会报这个错误Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)
at java.lang.AbstractStringBuilder.append(Unknown Source)
at java.lang.StringBuffer.append(Unknown Source)

Answer 6

是文件太大的时候出OutOfMemoryError吧!不是没次都出吧
widgetSelected(){}里面用下面的代码替换掉试一下. public void widgetSelected(SelectionEvent arg0) {
// TODO Auto-generated method stub
FileDialog fileDialog = new FileDialog(shell);
String fileIn = fileDialog.open();// get selected file path // read file content with FileInputStream,output content to screen
if (null != fileIn) {
BufferedReader fileReader = null;
try {
fileReader = new BufferedReader(new FileReader(fileIn));
StringBuffer buffer = new StringBuffer();
String line = null;
while (( line = fileReader.readLine()) != null) {
buffer.append(line);
}
outText.setText(buffer.toString());
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
fileReader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}

Answer 7

使用org.eclipse.swt.widgets.FileDialog选取文件 
点击button打开文件打开对话框，但是没有open而直接关闭对话框，程序整个退出，该怎么办？
是不是还得来个try catch?

Answer 8

package cn.com.swt;import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;public class WriteFileAfterRead {    public void open() {
        final Shell shell = new Shell(SWT.CLOSE);
        shell.setLayout(new FillLayout());        Composite composite = new Composite(shell, SWT.NONE);
        composite.setLayout(new GridLayout(2, false));        Button referBtn = new Button(composite, SWT.NONE);// use to open a file dialog
        referBtn.setText("Refer");        final StyledText outText = new StyledText(composite, SWT.MULTI
                | SWT.WRAP);// use to display file content
        outText.setLayoutData(new GridData(GridData.FILL_BOTH));
        referBtn.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent arg0) {
                // TODO Auto-generated method stub
                FileDialog fileDialog = new FileDialog(shell);
                String fileIn = fileDialog.open();// get selected file path                // read file content with FileInputStream,output content to screen
                if (null != fileIn) {
                    FileInputStream fileInputStream = null;
                    try {
                        fileInputStream = new FileInputStream(fileIn);
                        byte[] bufferBytes = new byte[256];
                        StringBuffer buffer = new StringBuffer();
                        while ((fileInputStream.read(bufferBytes)) != -1) {
                            buffer.append(new String(bufferBytes));
                        }
                        outText.setText(buffer.toString());
                    } catch (FileNotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } finally {
                        try {
                            fileInputStream.close();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }
            }
        });        shell.setSize(600, 400);
        shell.setText("Read File");
        shell.layout();
        shell.open();
        Display display = Display.getDefault();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }    public static void main(String[] args) {
        new WriteFileAfterRead().open();
    }
}