Java读取本地文件和读取指定网页

读取本地文件

通过本地文件的路径，把文件构造成File，通过流的读取，把文件内容一行行地读到String中。 

下面是代码：

public static List getFile(String filePath){

        System.out.println("Starting to get file...");

        List contents = new ArrayList();

        File file = new File(filePath);

        try {

            InputStream is = new FileInputStream(file);

            BufferedReader br = new BufferedReader(new InputStreamReader(is));

            String line;

            while((line = br.readLine()) != null){

                System.out.println(line);

                contents.add(line);

            }

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

        System.out.println("Finished geting file...");

        return contents;

    }

读取指定网页

通过网页的链接地址，构造URL，获取到Connection之后进行连接，如果连接成功，可以获取到流，最后把流读出到String即可。

下面是代码： 

public static StringreadFile(String txtUrl){

System.out.println("Start to get file from URL...");

    StringBuilder sb =new StringBuilder();

    URL url;

    try {

url =new URL(txtUrl);

        URLConnection conn = url.openConnection();

        conn.connect();

        HttpURLConnection httpConn = (HttpURLConnection)conn;

        if(httpConn.getResponseCode() == HttpURLConnection.HTTP_OK){

  InputStreamReader isr =new InputStreamReader(httpConn.getInputStream());

            BufferedReader br =new BufferedReader(isr);

            String s;

            while((s = br.readLine()) !=null){

                sb.append(s);

                sb.append(",");

            }

         sb.deleteCharAt(sb.length()-1);

        }else{

System.out.println("Cannot connect to the "+txtUrl);

        }

}catch (MalformedURLException e) {

e.printStackTrace();

    }catch (IOException e) {

e.printStackTrace();

    }

System.out.println("Finished getting the contents from URL...");

    return sb.toString();

}

详细可见：java读取本地和网页的文件