Java中字符串和流之间的转换

た入场券 2022-09-08 14:54 217阅读 0赞

### 目录 ###

*   *   *  字符串转换成流
         *  流转换成字符串
         *   *  方式1
             *  方式2

### 字符串转换成流 ###

public InputStream getInputStream(String str) { 
        if (str != null && !"".equals(str.trim())) { 
            try { 
                ByteArrayInputStream inputStream = new ByteArrayInputStream(str.getBytes(StandardCharsets.UTF_8));
                return inputStream;
            } catch (Exception e) { 
                e.printStackTrace();
            }
        }
        return null;
    }

### 流转换成字符串 ###

#### 方式1 ####

public String getStringByInputStream(InputStream inputStream) { 
        if (inputStream != null) { 
            try { 
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
                StringBuilder sb = new StringBuilder();
                String text = "";
                while ((text = reader.readLine()) != null) { 
                    sb.append(text);
                }
                return sb.toString();
            } catch (Exception e) { 
                e.printStackTrace();
            }
        }
        return null;
    }

#### 方式2 ####

public static String getStringByInputStream(InputStream inputStream) { 
        if (inputStream != null) { 
            try { 
                ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
                int length = 0;
                byte[] bytes = new byte[1024];
                while ((length = inputStream.read(bytes)) != -1) { 
                    outputStream.write(bytes, 0, length);
                }
                inputStream.close();
                outputStream.close();
                return outputStream.toString();
            } catch (Exception e) { 
                e.printStackTrace();
            }
        }
        return null;
    }