转载:https://blog.csdn.net/l1028386804/article/details/17956651
废话不多说，直接上代码：
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
/**
*
* @author LYZ
*
*/
public class SumJavaCode {
static long normalLines = 0; // 空行
static long commentLines = 0; // 注释行
static long whiteLines = 0; // 代码行
public static void main(String[] args) {
SumJavaCode sjc = new SumJavaCode();
File f = new File(“D:\\spring-framework-2.0-with-dependencies\\spring-framework-2.0″); //目录
System.out.println(f.getName());
sjc.treeFile(f);
System.out.println(“空行：” + normalLines);
System.out.println(“注释行：” + commentLines);
System.out.println(“代码行：” + whiteLines);
}
/**
* 查找出一个目录下所有的.java文件
*
* @param f 要查找的目录
*/
private void treeFile(File f) {
File[] childs = f.listFiles();
//int count = 0;
//int sum = 0;
for (int i = 0; i < childs.length; i++) {
// System.out.println(preStr + childs[i].getName());
if (!childs[i].isDirectory()) {
if (childs[i].getName().matches(“.*\\.java$”)) {
System.out.println(childs[i].getName());
//count ++;
sumCode(childs[i]);
}
} else {
treeFile(childs[i]);
//sum += count;
}
}
}
/**
* 计算一个.java文件中的代码行，空行，注释行
*
* @param file
* 要计算的.java文件
*/
private void sumCode(File file) {
BufferedReader br = null;
boolean comment = false;
try {
br = new BufferedReader(new FileReader(file));
String line = “”;
try {
while ((line = br.readLine()) != null) {
line = line.trim();
if (line.matches(“^[\\s&&[^\\n]]*$”)) {
whiteLines++;
} else if (line.startsWith(“/*”) && !line.endsWith(“*/”)) {
commentLines++;
comment = true;
} else if (true == comment) {
commentLines++;
if (line.endsWith(“*/”)) {
comment = false;
}
} else if (line.startsWith(“//”)) {
commentLines++;
} else {
normalLines++;
}
}
} catch (IOException e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
br = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}