import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.File;
import java.io.*;

public class ChangeFileType {

	public static void main(String[] args) {
		change ch = new change();

		String filename = "ChangeFileType.java";

		File file = new File(filename);

		if (!file.exists()) {
			System.err.println("create file fail!");
		}

		// File tempFile;
		// tempFile = ch.changeFile( file ); // 得到HTML文件
		String result = ch.changeFile(file); // 得到HTML文件返回的字符串
		System.out.println(result);
	}
}

class change {

	public String changeFile(File beginFile) {

		String fileName = beginFile.getName();
		String cmd = "source-highlight ChangeFileType.java";
		Runtime run = Runtime.getRuntime(); // 返回与当前 Java 应用程序相关的运行时对象
		try {
			Process pro = run.exec(cmd); // 启动另一个进程来执行命令
			BufferedInputStream in = new BufferedInputStream(
					pro.getInputStream());
			BufferedReader inBr = new BufferedReader(new InputStreamReader(in));
			String lineStr;
			while ((lineStr = inBr.readLine()) != null)
				// 获得命令执行后在控制台的输出信息
				System.out.println(lineStr);// 打印输出信息
			// 检查命令是否执行失败。
			if (pro.waitFor() != 0) {
				if (pro.exitValue() == 1)// pro.exitValue()==0表示正常结束，1：非正常结束
					System.err.println("Executive Command Fail!");
			}
			inBr.close();
			in.close();
		} catch (Exception e) {
			e.printStackTrace();
		}

		fileName = fileName + ".html";
		File endFile = new File(fileName);

		String result = changeToString(endFile);

		return result; // 返回转换后的的字符串

		// return endFile; // 返回转换后的HTML文件
	}

	public String changeToString(File file) {

		InputStreamReader reader = null;
		StringWriter writer = new StringWriter();
		try {
			reader = new InputStreamReader(new FileInputStream(file), "UTF-8");

			// 将输入流写入输出流
			char[] buffer = new char[1024];
			int n = 0;
			while (-1 != (n = reader.read(buffer))) {
				writer.write(buffer, 0, n);
			}
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		} finally {
			if (reader != null)
				try {
					reader.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
		}
		// 返回转换结果
		if (writer != null) {
			return writer.toString();
		} else {
			return null;
		}

	}
}