實現統計個人某個目錄下的java 文件個數，總代碼行數。

package j09;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

public class Tongh {

public static void main(String[] args) throws IOException {

String str = "E:/java/";

tongji(str);

System.out.printf("java文件%d共%d行代碼",a,d);

}

public static void tongji(String str) {

try {

tongji(new File(str));

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

static int a = 0, s = 0, d = 0;

public static void tongji(File file) throws IOException {

if (file.isDirectory()) {

File[] ile = file.listFiles();

for (File il : ile) {

tongji(il);

}

} else {

String name = file.getName();String kuo="";

if(name.lastIndexOf(".")==-1) {}else {

kuo =name.substring(name.lastIndexOf("."));}

if (kuo. contains(".java")) {

++a;

FileReader read = new FileReader(file);

BufferedReader fil = new BufferedReader(read);

s=0;

while (fil.ready()) {

fil.readLine();

++s;

}

d += s;

System.out.println(file.getName()+s+"行");

}

}

}

}

自動加水印

package j09;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

public class Tu {

public static void main(String[] args) {

try {

shui();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

static void shui() throws IOException {

String str="C:\\Users\\Administrator\\Pictures\\error.png";

File file=new File(str);

shui(file);

}

public static void shui(File file) throws IOException {

String dst=file.getPath();

BufferedImage s=ImageIO.read(file);

int width =s.getWidth();

int height= s.getHeight();

BufferedImage i=new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB);

Graphics g=i.getGraphics();

g.drawImage(s, 0, 0, width,height,null);

g.setColor(new Color(0,0,122,50));

g.fillRect(0, 0, width, height);

g.setColor(new Color(255,32,122,120));

g.setFont(new Font("黑體",Font.BOLD,40));

int x=width-200;

int y=height-35;

g.drawString("你好哈", x, y);

g.dispose();

ImageIO.write(i, "jpg", new File(dst));

}

}

總結

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