java.io.Reader类的使用及代码示例

x33g5p2x  于2022-01-28 转载在 其他  
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本文整理了Java中java.io.Reader类的一些代码示例，展示了Reader类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Reader类的具体详情如下：
包路径：java.io.Reader
类名称：Reader

Reader介绍

[英]The base class for all readers. A reader is a means of reading data from a source in a character-wise manner. Some readers also support marking a position in the input and returning to this position later.

This abstract class does not provide a fully working implementation, so it needs to be subclassed, and at least the #read(char[],int,int) and #close() methods needs to be overridden. Overriding some of the non-abstract methods is also often advised, since it might result in higher efficiency.

Many specialized readers for purposes like reading from a file already exist in this package.
[中]所有读者的基类。读卡器是一种以字符方式从源中读取数据的方法。一些读者还支持在输入中标记一个位置，然后返回到该位置。
这个抽象类没有提供完全工作的实现，因此需要对它进行子类化，至少需要重写#read（char[]，int，int）和#close（）方法。还经常建议重写一些非抽象方法，因为这样可能会提高效率。
这个包中已经存在许多专门的阅读器，用于读取文件等目的。

代码示例

代码示例来源：origin: stackoverflow.com

InputStream is = getResources().openRawResource(R.raw.json_file);
Writer writer = new StringWriter();
char[] buffer = new char[1024];
try {
  Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
  int n;
  while ((n = reader.read(buffer)) != -1) {
    writer.write(buffer, 0, n);
  }
} finally {
  is.close();
}

String jsonString = writer.toString();

代码示例来源：origin: stackoverflow.com

Properties properties = new Properties();
InputStream inputStream = new FileInputStream("path/to/file");
try {
  Reader reader = new InputStreamReader(inputStream, "UTF-8");
  try {
    properties.load(reader);
  } finally {
    reader.close();
  }
} finally {
  inputStream.close();
}

代码示例来源：origin: jersey/jersey

private static Reader ensureNonEmptyReader(Reader reader) throws XMLStreamException {
  try {
    Reader mr = reader.markSupported() ? reader : new BufferedReader(reader);
    mr.mark(1);
    if (mr.read() == -1) {
      throw new XMLStreamException("JSON expression can not be empty!");
    }
    mr.reset();
    return mr;
  } catch (IOException ex) {
    throw new XMLStreamException(ex);
  }
}

代码示例来源：origin: json-path/JsonPath

private static String convertReaderToString(Reader reader)
    throws IOException {
  if (reader != null) {
    Writer writer = new StringWriter();
    char[] buffer = new char[1024];
    try {
      int n;
      while ((n = reader.read(buffer)) != -1) {
        writer.write(buffer, 0, n);
      }
    } finally {
      reader.close();
    }
    return writer.toString();
  } else {
    return "";
  }
}

代码示例来源：origin: stackoverflow.com

URL url = new URL("http://stackoverflow.com/questions/1381617");
URLConnection con = url.openConnection();
Pattern p = Pattern.compile("text/html;\\s+charset=([^\\s]+)\\s*");
Matcher m = p.matcher(con.getContentType());
/* If Content-Type doesn't match this pre-conception, choose default and 
 * hope for the best. */
String charset = m.matches() ? m.group(1) : "ISO-8859-1";
Reader r = new InputStreamReader(con.getInputStream(), charset);
StringBuilder buf = new StringBuilder();
while (true) {
 int ch = r.read();
 if (ch < 0)
  break;
 buf.append((char) ch);
}
String str = buf.toString();

代码示例来源：origin: stackoverflow.com

InputStream ins = null; // raw byte-stream
Reader r = null; // cooked reader
BufferedReader br = null; // buffered for readLine()
try {
  String s;
  if (true) {
    String data = "#foobar\t1234\n#xyz\t5678\none\ttwo\n";
    ins = new ByteArrayInputStream(data.getBytes());
  } else {
    ins = new FileInputStream("textfile.txt");
  }
  r = new InputStreamReader(ins, "UTF-8"); // leave charset out for default
  br = new BufferedReader(r);
  while ((s = br.readLine()) != null) {
    System.out.println(s);
  }
}
catch (Exception e)
{
  System.err.println(e.getMessage()); // handle exception
}
finally {
  if (br != null) { try { br.close(); } catch(Throwable t) { /* ensure close happens */ } }
  if (r != null) { try { r.close(); } catch(Throwable t) { /* ensure close happens */ } }
  if (ins != null) { try { ins.close(); } catch(Throwable t) { /* ensure close happens */ } }
}

代码示例来源：origin: stackoverflow.com

StringBuilder sb = new StringBuilder();
int cp;
while ((cp = rd.read()) != -1) {
 sb.append((char) cp);
InputStream is = new URL(url).openStream();
try {
 BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
 String jsonText = readAll(rd);
 JSONObject json = new JSONObject(jsonText);
 return json;
} finally {
 is.close();

代码示例来源：origin: apache/ignite

/**
   * Reads file to string using specified charset.
   *
   * @param fileName File name.
   * @param charset File charset.
   * @return File content.
   * @throws IOException If error occurred.
   */
  public static String readFileToString(String fileName, Charset charset) throws IOException {
    Reader input = new InputStreamReader(new FileInputStream(fileName), charset);

    StringWriter output = new StringWriter();

    char[] buf = new char[4096];

    int n;

    while ((n = input.read(buf)) != -1)
      output.write(buf, 0, n);

    return output.toString();
  }
}

代码示例来源：origin: stackoverflow.com

private static String readUrl(String urlString) throws Exception {
  BufferedReader reader = null;
  try {
    URL url = new URL(urlString);
    reader = new BufferedReader(new InputStreamReader(url.openStream()));
    StringBuffer buffer = new StringBuffer();
    int read;
    char[] chars = new char[1024];
    while ((read = reader.read(chars)) != -1)
      buffer.append(chars, 0, read); 

    return buffer.toString();
  } finally {
    if (reader != null)
      reader.close();
  }
}

代码示例来源：origin: weibocom/motan

/**
 * Parses the JSON input file containing the list of features.
 */
public static List<Feature> parseFeatures(URL file) throws IOException {
 InputStream input = file.openStream();
 try {
  Reader reader = new InputStreamReader(input);
  try {
   FeatureDatabase.Builder database = FeatureDatabase.newBuilder();
   JsonFormat.parser().merge(reader, database);
   return database.getFeatureList();
  } finally {
   reader.close();
  }
 } finally {
  input.close();
 }
}

代码示例来源：origin: org.codehaus.plexus/plexus-utils

fileReader = new BufferedReader( new FileReader( from ) );
  fileWriter = new FileWriter( to );
  FileInputStream instream = new FileInputStream( from );
  fileReader = new BufferedReader( new InputStreamReader( instream, encoding ) );
fileWriter.close();
fileWriter = null;
fileReader.close();
fileReader = null;

代码示例来源：origin: stackoverflow.com

public static String readFile(String file, String csName)
      throws IOException {
  Charset cs = Charset.forName(csName);
  return readFile(file, cs);
}

public static String readFile(String file, Charset cs)
      throws IOException {
  // No real need to close the BufferedReader/InputStreamReader
  // as they're only wrapping the stream
  FileInputStream stream = new FileInputStream(file);
  try {
    Reader reader = new BufferedReader(new InputStreamReader(stream, cs));
    StringBuilder builder = new StringBuilder();
    char[] buffer = new char[8192];
    int read;
    while ((read = reader.read(buffer, 0, buffer.length)) > 0) {
      builder.append(buffer, 0, read);
    }
    return builder.toString();
  } finally {
    // Potential issue here: if this throws an IOException,
    // it will mask any others. Normally I'd use a utility
    // method which would log exceptions and swallow them
    stream.close();
  }        
}

代码示例来源：origin: internetarchive/heritrix3

if (uri.trim().length() == 0) {
  File source = getMapPath().getFile();
  reader = new FileReader(source);
} else {
  URLConnection conn = (new URL(uri)).openConnection();
  reader = new InputStreamReader(conn.getInputStream());
reader = new BufferedReader(reader);
Iterator<String> iter = 
  new RegexLineIterator(
  map.put(entry[0],entry[1]);
reader.close();

代码示例来源：origin: org.apache.hadoop/hadoop-common

String extractPassword(String pwFile) {
  if (pwFile.isEmpty()) {
   // If there is no password file defined, we'll assume that we should do
   // an anonymous bind
   return "";
  }

  StringBuilder password = new StringBuilder();
  try (Reader reader = new InputStreamReader(
    new FileInputStream(pwFile), StandardCharsets.UTF_8)) {
   int c = reader.read();
   while (c > -1) {
    password.append((char)c);
    c = reader.read();
   }
   return password.toString().trim();
  } catch (IOException ioe) {
   throw new RuntimeException("Could not read password file: " + pwFile, ioe);
  }
 }
}

代码示例来源：origin: oracle/opengrok

new InputStreamReader(new FileInputStream(
source + filename), StandardCharsets.UTF_8),
null, null, null, filename, tags, nhits > 100,
  ? new HTMLStripCharFilter(new BufferedReader(new InputStreamReader(new GZIPInputStream(new FileInputStream(
      TandemPath.join(data + Prefix.XREF_P + filename, ".gz"))))))
  : new HTMLStripCharFilter(new BufferedReader(new FileReader(data + Prefix.XREF_P + filename)))) {
l = r.read(content);

代码示例来源：origin: stanfordnlp/CoreNLP

/**
 * Loads treebank data from first argument and prints it.
 *
 * @param args Array of command-line arguments: specifies a filename
 */
public static void main(String[] args) {
 try {
  TreeFactory tf = new LabeledScoredTreeFactory();
  Reader r = new BufferedReader(new InputStreamReader(new FileInputStream(args[0]), "UTF-8"));
  TreeReader tr = new PennTreeReader(r, tf);
  Tree t = tr.readTree();
  while (t != null) {
   System.out.println(t);
   System.out.println();
   t = tr.readTree();
  }
  r.close();
 } catch (IOException ioe) {
  throw new RuntimeIOException(ioe);
 }
}

代码示例来源：origin: stackoverflow.com

writer().write(chars);
writer().close();
this.reader = new BufferedReader(new FileReader(filepath)); 
this.read_ahead = this.reader.readLine();
    reader = new BufferedReader(new FileReader(filepath));   
reader().close();

代码示例来源：origin: stackoverflow.com

private String readFileAsString(String filePath) throws IOException {
   StringBuffer fileData = new StringBuffer();
   BufferedReader reader = new BufferedReader(
       new FileReader(filePath));
   char[] buf = new char[1024];
   int numRead=0;
   while((numRead=reader.read(buf)) != -1){
     String readData = String.valueOf(buf, 0, numRead);
     fileData.append(readData);
   }
   reader.close();
   return fileData.toString();
 }

代码示例来源：origin: stackoverflow.com

Process nativeApp = Runtime.getRuntime().exec("/data/data/com.yourdomain.yourapp/nativeFolder/application");
     BufferedReader reader = new BufferedReader(new InputStreamReader(nativeApp.getInputStream()));
     int read;
     char[] buffer = new char[4096];
     StringBuffer output = new StringBuffer();
     while ((read = reader.read(buffer)) > 0) {
       output.append(buffer, 0, read);
     }
     reader.close();
     // Waits for the command to finish.
     nativeApp.waitFor();
     String nativeOutput =  output.toString();

代码示例来源：origin: ltsopensource/light-task-scheduler

private static String getStreamAsString(InputStream stream, String charset) throws IOException {
  try {
    Reader reader = new InputStreamReader(stream, charset);
    StringBuilder response = new StringBuilder();
    final char[] buff = new char[1024];
    int read = 0;
    while ((read = reader.read(buff)) > 0) {
      response.append(buff, 0, read);
    }
    return response.toString();
  } finally {
    if (stream != null) {
      stream.close();
    }
  }
}

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