Java常用工具方法

以GET请求形式获取文本文件内容

/**
 * 以GET请求形式获取文本文件内容
 * @param url http下载地址，比如http://www.abc.com/123.css
 * @return
 * @throws ClientProtocolException
 * @throws IOException
 */
public static String getFileContent(String url) throws ClientProtocolException, IOException{
	HttpClient httpCient = new DefaultHttpClient();
	HttpGet httpGet = new HttpGet(url);
	HttpResponse httpResponse = httpCient.execute(httpGet);
	if (httpResponse.getStatusLine().getStatusCode() == 200) {
		HttpEntity entity = httpResponse.getEntity();
		String response = EntityUtils.toString(entity,"utf-8");
		return response;
	}
	return null;
}

创建新文件

/**
 * 创建新文件
 * @param file
 * @throws IOException
 */
public static void createNewFile(File file) throws IOException{
	/**
	 * 如果父目录不存在即创建
	 */
	if(!file.getParentFile().exists()) {
		file.getParentFile().mkdirs();
	}
	file.delete();
	file.createNewFile();
}

给文本文件追加内容

/**
 * 给文本文件追加内容
 * @param content
 * @param file
 * @return
 * @throws Exception
 */
public static boolean appendTxtFile(String content, File file) throws Exception {
	boolean append = false;
	try {
		if (file.exists()){
			append = true;
		}
		FileWriter fw = new FileWriter(file, append);
		// 创建字符输出流对象
		BufferedWriter bf = new BufferedWriter(fw);
		// 创建缓冲字符输出流对象
		bf.append(content);
		bf.flush();
		bf.close();
	} catch (IOException e) {
		e.printStackTrace();
	}
	return append;
}