FileUtils.java

package com.hua.goddess.utils;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class FileUtils {
	private static final int BUFFER = 8192;

	// 读取文件
	public static String readTextFile(File file) throws IOException {
		String text = null;
		InputStream is = null;
		try {
			is = new FileInputStream(file);
			text = readTextInputStream(is);
		} finally {
			if (is != null) {
				is.close();
			}
		}
		return text;
	}

	// 从流中读取文件
	public static String readTextInputStream(InputStream is) throws IOException {
		StringBuffer strbuffer = new StringBuffer();
		String line;
		BufferedReader reader = null;
		try {
			reader = new BufferedReader(new InputStreamReader(is));
			while ((line = reader.readLine()) != null) {
				strbuffer.append(line).append("\r\n");
			}
		} finally {
			if (reader != null) {
				reader.close();
			}
		}
		return strbuffer.toString();
	}

	// 将文本内容写入文件
	public static void writeTextFile(File file, String str) throws IOException {
		DataOutputStream out = null;
		try {
			out = new DataOutputStream(new FileOutputStream(file));
			out.write(str.getBytes());
		} finally {
			if (out != null) {
				out.close();
			}
		}
	}

	// 复制文件
	public static void copyFile(File sourceFile, File targetFile)
			throws IOException {
		BufferedInputStream inBuff = null;
		BufferedOutputStream outBuff = null;
		try {
			inBuff = new BufferedInputStream(new FileInputStream(sourceFile));
			outBuff = new BufferedOutputStream(new FileOutputStream(targetFile));
			byte[] buffer = new byte[BUFFER];
			int length;
			while ((length = inBuff.read(buffer)) != -1) {
				outBuff.write(buffer, 0, length);
			}
			outBuff.flush();
		} finally {
			if (inBuff != null) {
				inBuff.close();
			}
			if (outBuff != null) {
				outBuff.close();
			}
		}
	}
}