inputStream 与 String 的互相转换

一. String 转换为InputStream

String str = "String 与 inputStream转换";

InputStream ins1 = new ByteArrayInputStream(str.getBytes());

InputStream ins2 = new ByteArrayInputStream(str.getBytes("UTF-8"));

二. InputStream 转为 String

方法一：利用bufferedReader

public String convertToString(InputStream is){
        BufferedReader bReader = new BufferedReader(new InputStreamReader(is));
        StringBuffer buffer = new StringBuffer();
        String line = null;
        try {
            while((line = bReader.readLine())!=null){
                buffer.append(line);
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try {
                bReader.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return buffer.toString();
    }

方法二：

public String convertToString(InputStream is){
        StringBuffer buffer = new StringBuffer();
        byte[] b = new byte[1024];
        try {
            for(int n; (n = is.read(b))!=-1;)
                buffer.append(new String(b,0,n));
            return buffer.toString();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            try {
                is.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

方法三：

public String convertToString(InputStream is){
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        int i = -1;
        try {
            while((i = is.read())!=-1){
                os.write(i);
            }
            return os.toString();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        }finally{
            try {
                os.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }