String与InputStream相互转换

1.String to InputStream

String str = "String与InputStream相互转换";

 

InputStream in_nocode = new ByteArrayInputStream(str.getBytes());

    InputStream in_withcode = new ByteArrayInputStream(str.getBytes("UTF-8"));

2.InputStream to String

    这里提供几个方法。

方法1：

public String convertStreamToString(InputStream is) {

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

        StringBuilder sb = new StringBuilder();

        String line = null;

        try {

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

                sb.append(line + "/n");

            }

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            try {

                is.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

        return sb.toString();

    }

方法2：

public String inputStream2String(InputStream in) throws IOException {

        StringBuffer out = new StringBuffer();

        byte[] b = new byte[4096];

        for (int n; (n = in.read(b)) != -1;) {

            out.append(new String(b, 0, n));

        }

        return out.toString();

    }

方法3：

public static String inputStream2String(InputStream is) throws IOException {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        int i = -1;

        while ((i = is.read()) != -1) {

            baos.write(i);

        }

        return baos.toString();

    }