Beta版
查找文件夹下所有指定文件类型的文件的文本内容中是否含有特定的字符串。
JAVA 控制台实现，硬编码
输出关键字，文件绝对路径，关键字出现的行数，关键字所在行的文本内容

public class SearchKey {
// the number of appear time.
private static int count;
public static void fileList(PrintWriter writer, File file, String key) {
File[] files = file.listFiles();
for (File childFile : files) {
// judge the file is a directory or not
if (childFile.isDirectory()) {
fileList(writer, childFile, key);
} else {
String fileName = childFile.getAbsolutePath();
// the type of search file(.java, .jsp)
if (fileName.endsWith(".java") || fileName.endsWith(".jsp")) {
findKey(writer, childFile, key);
}
}
}
}
// print the file name and the line that the key word appeared and the line number
public static void findKey(PrintWriter writer, File file, String key) {
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader(file));
String fileName = file.getAbsolutePath();
String tempString = null;
int line = 1;
while ((tempString = reader.readLine()) != null) {
if (tempString.contains("*" + key + "*") || tempString.contains(*"* + key + *"*)) {
if (count != 0) {
writer.write(key);
}
writer.write("\t" + fileName);
writer.write("\t" + "line " + line + "\t" + tempString.trim() + "\n");
count ++;
}
line ++;
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
File file = new File("C:\\src\\git\\dmp");// the folder will be search
PrintWriter writer = null;
try {
writer = new PrintWriter(new File("C:\\src\\git\\I18N.txt"));// print the message to this txt file.
count = 0;
writer.write(key);
fileList(writer, file, key);
if (count == 0) {
writer.write("\n");
}
writer.write("\n");
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}