用于大写的Java Swing DocumentFilter

问题是当我选择文本并重新键入时；然后选定的文本不会被删除，但会保留（请查看顶部的gif）

您应该调用

super.replace（…）

，因为您正在重写replace（）方法

您应该调用

super.replace（…）

，因为您正在重写replace（）方法

自定义文本字段

import java.awt.KeyboardFocusManager;
import javax.swing.InputVerifier;
import javax.swing.JTextField;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
import javax.swing.text.DocumentFilter.FilterBypass;

/**
 *
 * @author Igor
 */
public class CustomLengthTextField extends JTextField {

    protected boolean upper = false;
    protected int maxlength = 0;

    public CustomLengthTextField() {
        this(-1);
    }

    public CustomLengthTextField(int length, boolean upper) {
        this(length, upper, null);
    }

    public CustomLengthTextField(int length, InputVerifier inpVer) {
        this(length, false, inpVer);
    }

    /**
     *
     * @param length - maksimalan length
     * @param upper - turn it to upercase
     * @param inpVer - InputVerifier
     */
    public CustomLengthTextField(int length, boolean upper, InputVerifier inpVer) {
        super();
        this.maxlength = length;
        this.upper = upper;
        if (length > 0) {
            AbstractDocument doc = (AbstractDocument) getDocument();
            doc.setDocumentFilter(new DocumentSizeFilter());
        }
        setInputVerifier(inpVer);
    }

    public CustomLengthTextField(int length) {
        this(length, false);
    }

    public void setMaxLength(int length) {
        this.maxlength = length;
    }

    class DocumentSizeFilter extends DocumentFilter {

        public void insertString(FilterBypass fb, int offs, String str, AttributeSet a)
                throws BadLocationException {

            //This rejects the entire insertion if it would make
            //the contents too long. Another option would be
            //to truncate the inserted string so the contents
            //would be exactly maxCharacters in length.
            if ((fb.getDocument().getLength() + str.length()) <= maxlength) {
                super.insertString(fb, offs, str, a);
            }
        }

        public void replace(FilterBypass fb, int offs,
                int length,
                String str, AttributeSet a)
                throws BadLocationException {

            if (upper) {
                str = str.toUpperCase();
            }

            //This rejects the entire replacement if it would make
            //the contents too long. Another option would be
            //to truncate the replacement string so the contents
            //would be exactly maxCharacters in length.
            int charLength = fb.getDocument().getLength() + str.length() - length;

            if (charLength <= maxlength) {
                super.replace(fb, offs, length, str, a);
                if (charLength == maxlength) {
                    focusNextComponent();
                }
            } else {
                focusNextComponent();
            }
        }

        private void focusNextComponent() {
            if (CustomLengthTextField.this == KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner()) {
                KeyboardFocusManager.getCurrentKeyboardFocusManager().focusNextComponent();
            }
        }
    }
}

导入java.awt.KeyboardFocusManager；
导入javax.swing.InputVerifier；
导入javax.swing.JTextField；
导入javax.swing.text.AbstractDocument；
导入javax.swing.text.AttributeSet；
导入javax.swing.text.BadLocationException；
导入javax.swing.text.DocumentFilter；
导入javax.swing.text.DocumentFilter.FilterBypass；
/**
*
*@作者伊戈尔
*/
公共类CustomLengthTextField扩展了JTextField{
受保护布尔值上限=false；
受保护的整数maxlength=0；
公共CustomLengthTextField（）{
这是（-1）；
}
公共CustomLengthTextField（整数长度，布尔上限）{
该值（长度、上限、空值）；
}
公共CustomLengthTextField（int-length，InputVerifier-Inputver）{
这（长度、错误、输入）；
}
/**
*
*@param-length-maksimalan长度
*@param upper-将其转为大写
*@param Inputver-InputVerifier
*/
公共CustomLengthTextField（整数长度、布尔值上限、InputVerifier Inputver）{
超级（）；
this.maxlength=长度；
this.upper=upper；
如果（长度>0）{
AbstractDocument doc=（AbstractDocument）getDocument（）；
doc.setDocumentFilter（新DocumentSizeFilter（））；
}
setInputVerifier（输入验证程序）；
}
公共CustomLengthTextField（整数长度）{
这个（长度，假）；
}
公共void setMaxLength（整数长度）{
this.maxlength=长度；
}
类DocumentSizeFilter扩展了DocumentFilter{
public void insertString（FilterBypass fb、int offs、String str、AttributeSet a）
抛出BadLocationException{
//这将拒绝整个插入，如果它将
//内容太长。另一个选项是
//截断插入的字符串以便
//长度正好是maxCharacters。
如果（（fb.getDocument（）.getLength（）+str.length（））
自定义文本字段

import java.awt.KeyboardFocusManager;
import javax.swing.InputVerifier;
import javax.swing.JTextField;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
import javax.swing.text.DocumentFilter.FilterBypass;

/**
 *
 * @author Igor
 */
public class CustomLengthTextField extends JTextField {

    protected boolean upper = false;
    protected int maxlength = 0;

    public CustomLengthTextField() {
        this(-1);
    }

    public CustomLengthTextField(int length, boolean upper) {
        this(length, upper, null);
    }

    public CustomLengthTextField(int length, InputVerifier inpVer) {
        this(length, false, inpVer);
    }

    /**
     *
     * @param length - maksimalan length
     * @param upper - turn it to upercase
     * @param inpVer - InputVerifier
     */
    public CustomLengthTextField(int length, boolean upper, InputVerifier inpVer) {
        super();
        this.maxlength = length;
        this.upper = upper;
        if (length > 0) {
            AbstractDocument doc = (AbstractDocument) getDocument();
            doc.setDocumentFilter(new DocumentSizeFilter());
        }
        setInputVerifier(inpVer);
    }

    public CustomLengthTextField(int length) {
        this(length, false);
    }

    public void setMaxLength(int length) {
        this.maxlength = length;
    }

    class DocumentSizeFilter extends DocumentFilter {

        public void insertString(FilterBypass fb, int offs, String str, AttributeSet a)
                throws BadLocationException {

            //This rejects the entire insertion if it would make
            //the contents too long. Another option would be
            //to truncate the inserted string so the contents
            //would be exactly maxCharacters in length.
            if ((fb.getDocument().getLength() + str.length()) <= maxlength) {
                super.insertString(fb, offs, str, a);
            }
        }

        public void replace(FilterBypass fb, int offs,
                int length,
                String str, AttributeSet a)
                throws BadLocationException {

            if (upper) {
                str = str.toUpperCase();
            }

            //This rejects the entire replacement if it would make
            //the contents too long. Another option would be
            //to truncate the replacement string so the contents
            //would be exactly maxCharacters in length.
            int charLength = fb.getDocument().getLength() + str.length() - length;

            if (charLength <= maxlength) {
                super.replace(fb, offs, length, str, a);
                if (charLength == maxlength) {
                    focusNextComponent();
                }
            } else {
                focusNextComponent();
            }
        }

        private void focusNextComponent() {
            if (CustomLengthTextField.this == KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner()) {
                KeyboardFocusManager.getCurrentKeyboardFocusManager().focusNextComponent();
            }
        }
    }
}

导入java.awt.KeyboardFocusManager；
导入javax.swing.InputVerifier；
导入javax.swing.JTextField；
导入javax.swing.text.AbstractDocument；
导入javax.swing.text.AttributeSet；
导入javax.swing.text.BadLocationException；
导入javax.swing.text.DocumentFilter；
导入javax.swing.text.DocumentFilter.FilterBypass；
/**
*
*@作者伊戈尔
*/
公共类CustomLengthTextField扩展了JTextField{
受保护布尔值上限=false；
受保护的整数maxlength=0；
公共CustomLengthTextField（）{
这是（-1）；
}
公共CustomLengthTextField（整数长度，布尔上限）{
该值（长度、上限、空值）；
}
公共CustomLengthTextField（int-length，InputVerifier-Inputver）{
这（长度、错误、输入）；
}
/**
*
*@param-length-maksimalan长度
*@param upper-将其转为大写
*@param Inputver-InputVerifier
*/
公共CustomLengthTextField（整数长度、布尔值上限、InputVerifier Inputver）{
超级（）；
this.maxlength=长度；
this.upper=upper；
如果（长度>0）{
AbstractDocument doc=（AbstractDocument）getDocument（）；
doc.setDocumentFilter（新DocumentSizeFilter（））；
}
setInputVerifier（输入验证程序）；
}
公共CustomLengthTextField（整数长度）{
这个（长度，假）；
}
公共void setMaxLength（整数长度）{
this.maxlength=长度；
}
类DocumentSizeFilter扩展了DocumentFilter{
public void insertString（FilterBypass fb、int offs、String str、AttributeSet a）
抛出BadLocationException{
//这将拒绝整个插入，如果它将
//内容太长。另一个选项是
//截断插入的字符串以便
//长度正好是maxCharacters。
如果（（fb.getDocument（）.getLength（）+str.length（））请你发布正确的代码。非常感谢。非常感谢，现在我已经解决了问题谢谢！你太棒了：-）请你发布正确的代码。非常感谢。非常感谢，现在我已经解决了问题谢谢！你太棒了：-）
CustomLengthTextField textField = new CustomLengthTextField(-1, true);

import java.awt.KeyboardFocusManager;
import javax.swing.InputVerifier;
import javax.swing.JTextField;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
import javax.swing.text.DocumentFilter.FilterBypass;

/**
 *
 * @author Igor
 */
public class CustomLengthTextField extends JTextField {

    protected boolean upper = false;
    protected int maxlength = 0;

    public CustomLengthTextField() {
        this(-1);
    }

    public CustomLengthTextField(int length, boolean upper) {
        this(length, upper, null);
    }

    public CustomLengthTextField(int length, InputVerifier inpVer) {
        this(length, false, inpVer);
    }

    /**
     *
     * @param length - maksimalan length
     * @param upper - turn it to upercase
     * @param inpVer - InputVerifier
     */
    public CustomLengthTextField(int length, boolean upper, InputVerifier inpVer) {
        super();
        this.maxlength = length;
        this.upper = upper;
        if (length > 0) {
            AbstractDocument doc = (AbstractDocument) getDocument();
            doc.setDocumentFilter(new DocumentSizeFilter());
        }
        setInputVerifier(inpVer);
    }

    public CustomLengthTextField(int length) {
        this(length, false);
    }

    public void setMaxLength(int length) {
        this.maxlength = length;
    }

    class DocumentSizeFilter extends DocumentFilter {

        public void insertString(FilterBypass fb, int offs, String str, AttributeSet a)
                throws BadLocationException {

            //This rejects the entire insertion if it would make
            //the contents too long. Another option would be
            //to truncate the inserted string so the contents
            //would be exactly maxCharacters in length.
            if ((fb.getDocument().getLength() + str.length()) <= maxlength) {
                super.insertString(fb, offs, str, a);
            }
        }

        public void replace(FilterBypass fb, int offs,
                int length,
                String str, AttributeSet a)
                throws BadLocationException {

            if (upper) {
                str = str.toUpperCase();
            }

            //This rejects the entire replacement if it would make
            //the contents too long. Another option would be
            //to truncate the replacement string so the contents
            //would be exactly maxCharacters in length.
            int charLength = fb.getDocument().getLength() + str.length() - length;

            if (charLength <= maxlength) {
                super.replace(fb, offs, length, str, a);
                if (charLength == maxlength) {
                    focusNextComponent();
                }
            } else {
                focusNextComponent();
            }
        }

        private void focusNextComponent() {
            if (CustomLengthTextField.this == KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner()) {
                KeyboardFocusManager.getCurrentKeyboardFocusManager().focusNextComponent();
            }
        }
    }
}