InputStream,String,File相互轉化
1. String --> InputStream
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InputStream String2InputStream(String str){ ByteArrayInputStream stream = new ByteArrayInputStream(str.getBytes()); return stream;} |
2. InputStream --> String
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String inputStream2String(InputStream is){ BufferedReader in = new BufferedReader(new InputStreamReader(is)); StringBuffer buffer = new StringBuffer(); String line = ""; while ((line = in.readLine()) != null){ buffer.append(line); } return buffer.toString();} |
今天從網上看到了另一種方法，特拿來分享
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String all_content=null; try { all_content =new String(); InputStream ins = 獲取的輸入流; ByteArrayOutputStream outputstream = new ByteArrayOutputStream(); byte[] str_b = new byte[1024]; int i = -1; while ((i=ins.read(str_b)) > 0) { outputstream.write(str_b,0,i); } all_content = outputstream.toString(); } catch (Exception e) {e.printStackTrace(); } |
此兩種方法上面一種更快，但是比較耗內存，后者速度慢，耗資源少
3、File --> InputStream
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InputStream in = new InputStream(new FileInputStream(File)); |
4、InputStream --> File
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public void inputstreamtofile(InputStream ins,File file){OutputStream os = new FileOutputStream(file);int bytesRead = 0;byte[] buffer = new byte[8192];while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {os.write(buffer, 0, bytesRead);}os.close();ins.close();} |
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