java读取文件信息并显示在界面上

Posted 2023-03-30

我的代码为什么不可以把文件信息显示在界面上呢？要怎么改呢？谢谢啊！
private static File file;//要检查的文件
String s;
public void readText()

try

FileReader fr = new FileReader(file);//需要读取的文件路径
BufferedReader br = new BufferedReader(fr);
s = br.readLine();
while(s!=null)//如果当前行不为空

s= br.readLine();//读取下一行

br.close();//关闭BufferReader流
fr.close(); //关闭文件流
catch(IOException e)//捕捉异常

System.out.println("指定文件不存在");//处理异常


txaText.setText(s);

final JTextArea edit = new JTextArea(30, 60);

s= br.readLine();//读取下一行
textarea对象的read方法读入：
FileReader reader = new FileReader( "xxx.txt" ); 这里要指定文件啊
BufferedReader br = new BufferedReader(reader);
edit.read( br, null );
接下来就要保存到全局变量。追问

您好！我是想自己选择文件要怎么改呢？就是根据我选择的文件来显示内容。谢谢啊！

参考技术A

使用JTextArea即可

java如何读取文件夹中的图片并在界面显示

请给出具体代码 多谢了

下面给你提供一个实现，该实现采用了代理模式。这个实现包含两个文件，分别是Client.java和ImageIcoProxy.java，ImageIcoProxy.java负责了图片的延迟加载，你可以修改为不延迟即可。

Client.java的代码为：
import java.awt.Graphics;
import java.awt.Insets;

import javax.swing.Icon;
import javax.swing.JFrame;

public class Client extends JFrame
private static int IMG_WIDTH = 510;
private static int IMG_HEIGHT = 317;
private Icon imgProxy = null;
public static void main(String[] args)
Client app = new Client();
app.setVisible(true);


public Client()
super("Virture Proxy Client");
imgProxy = new ImageIcoProxy("D:/test.jpg", IMG_WIDTH, IMG_HEIGHT);
this.setBounds(100, 100, IMG_WIDTH + 10, IMG_HEIGHT + 30);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

public void paint(Graphics g)
super.paint(g);
Insets insets = getInsets();
imgProxy.paintIcon(this, g, insets.left, insets.top);



ImageIcoProxy.java的代码为：
import java.awt.Component;
import java.awt.Graphics;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.SwingUtilities;

public class ImageIcoProxy implements Icon

private ImageIcon realIcon = null;
private String imgName;
private int width;
private int height;
boolean isIconCreated = false;
public ImageIcoProxy(String imgName, int width, int height)
this.imgName = imgName;
this.width = width;
this.height = height;


public int getIconHeight()
return realIcon.getIconHeight();


public int getIconWidth()
return realIcon.getIconWidth();


public void paintIcon(final Component c, Graphics g, int x, int y)
if (isIconCreated)
//已经加载了图片，直接显示
realIcon.paintIcon(c, g, x, y);
g.drawString("Just Test", x + 20, y + 370);
else
g.drawRect(x, y, width-1, height-1);
g.drawString("Loading photo...", x+20, y+20);
synchronized(this)
SwingUtilities.invokeLater(new Runnable()

public void run()
try
Thread.currentThread().sleep(2000);
realIcon = new ImageIcon(imgName);
isIconCreated = true;
catch (Exception e)
e.printStackTrace();

c.repaint();



);




参考技术A 1、获取文件夹的路径
2、得到文件夹中的有图片的名称，可以存到数组或者集合中
3、你再到jsp页面做显示，
4、下面是获取路径和文件名的代码，前台显示的代码自己写
String path = 文件夹路径;
String names = "";
try
File f = new File(path);
if (f.isDirectory())

File[] fList = f.listFiles();
for (int j = 0; j < fList.length; j++)
File file = fList[j]; if (file.isFile())

names += file.getName();



catch (Exception e)