showfileapplet.java

来自「JAVA案例开发集锦源代码 袁然 郑自国编」· Java 代码 · 共 133 行

package com.applet;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.TextArea;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

import javax.swing.JApplet;

public class ShowFileApplet extends JApplet {

	private boolean isStandalone = false;

	private String content = "文件的内容是："; //自定义的提示信息

	private String fileName = "C:\\WINDOWS\\system.ini";//读出这个文件的内容

	private TextArea ta = new TextArea(10, 80);//自定义的输出框

	public String getParameter(String key, String def) {

		return isStandalone ? System.getProperty(key, def) :

		(getParameter(key) != null ? getParameter(key) : def);

	}

	public ShowFileApplet() {

	}

	public void init() {

		try {

			jbInit();

			myInit();//自己定义的方法

		}

		catch (Exception e) {

			e.printStackTrace();

		}

	}

	private void jbInit() throws Exception {

		this.setSize(new Dimension(400, 300));

	}

	/**
	 * 
	 * 自定义的初始化方法，读入系统中的一个文件的内容并保存起来，然后，增加一个
	 * 
	 * 可视化的输出框
	 *  
	 */

	private void myInit() {

		String s;

		BufferedReader in;

		try {

			in = new BufferedReader(new FileReader(fileName));

			while ((s = in.readLine()) != null) {

				content += s + "\n";

			}

		} catch (IOException ex) {

			ex.printStackTrace();

		}

		System.out.println(content);

		ta.setText(content);

		getContentPane().add(ta);

	}

	/*
	 * 
	 * 重载的方法，输出内容
	 *  
	 */

	public void paint(Graphics g) {

		ta.setText(content);

	}

	public String getAppletInfo() {

		return "Applet Information";

	}

	public String[][] getParameterInfo() {

		return null;

	}

	//static initializer for setting look & feel

	static {

		try {

		}

		catch (Exception e) {

		}

	}

}