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在Java中将输入流读取转换为字符串的11种方法

智云科技发布于 2023年6月9日评论关闭阅读(61)

我找到了11种主要的方法来做到这一点(见下文)。

将输入流转换为 字符串 的方法:

·使用 IOUtils.toString ( apache Utils) 

 String result = IOUtils.toString( InputStream , StandardCharsets.UTF_8);

Maven 配置 

 <dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.11.0</version>
</dependency>

·使用 CharStreams (Guava) 

 String result = CharStreams.toString(new InputStreamReader(inputStream, Charsets.UTF_8));

Maven 配置 

 <dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>18.0</version>
</dependency>

·使用 Scanner ( JDK ) 

 Scanner s = new Scanner(inputStream).useDelimiter("\\A");
 String  result = s.hasNext() ? s.next() : "";

·使用 Stream API (Java 8). 警告 : 此解决方案将不同的换行符(如\r\n)转换为\n。 

 String result = new BufferedReader(new InputStreamReader(inputStream)).lines().collect(Collectors.joining("\n"));

·使用 parallel Stream API (Java 8). 警告 : 这个解决方案将不同的换行符(如\r\n)转换为\n。 

 String result = new BufferedReader(new InputStreamReader(inputStream)).lines().parallel().collect(Collectors.joining("\n"));

·使用 InputStreamReader and StringBuilder (JDK) 

 int bufferSize = 1024;
char[] buffer = new char[bufferSize];
StringBuilder out = new StringBuilder();
Reader in = new InputStreamReader(stream, StandardCharsets.UTF_8);
for (int numRead; (numRead = in.read(buffer, 0, buffer.length)) > 0; ) {
out.append(buffer, 0, numRead);
}
return out.toString();

·使用 StringWriter and IOUtils. copy (Apache Commons) 

 StringWriter writer = new StringWriter();
IOUtils.copy( inputStream , writer, " UTF-8 ");
return writer.toString();

·使用 byte ArrayOutputStream and inputStream.read (JDK) 

 ByteArrayOutputStream result = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
for (int length; (length = inputStream.read(buffer)) != -1; ) {
result.write(buffer, 0, length);
}
// StandardCharsets.UTF_8.name() > JDK 7
return result.toString("UTF-8");

·使用 BufferedReader (JDK). 警告: 这个解决方案将不同的换行符(如\n\r)转换为行。separator系统属性(例如，在Windows中为”\r\n”)。 

 String newLine = System.getProperty("line.separator");
BufferedReader reader = new BufferedReader(
new  input StreamReader(inputStream));
StringBuilder result = new StringBuilder();
for (String line; (line = reader.readLine()) != null; ) {
if (result.length() > 0) {
result.append(newLine);
}
result.append(line);
}
return result.toString();

·使用 BufferedInputStream and ByteArrayOutputStream (JDK) 

 BufferedInputStream bis = new BufferedInputStream(inputStream);
ByteArrayOutputStream buf = new ByteArrayOutputStream();
for (int result = bis.read(); result != -1; result = bis.read()) {
buf.write((byte) result);
}
// StandardCharsets.UTF_8.name() > JDK 7
return buf.toString("UTF-8");

·使用 inputStream.read() and StringBuilder (JDK). 警告 : 这个解决方案在 Unicode 方面有问题，只能在非Unicode文本上正确工作 

 StringBuilder sb = new StringBuilder();
for (int ch; (ch = inputStream.read()) != -1; ) {
sb.append((char) ch);
}
return sb.toString();

注意 :

1、解决方案4、5、9 此解决方案将不同的换行符（如\r\n转换为\n），（\r\n是Windows系统的换行符，而在 Unix 、Liunx等系统中的换行符为 \n）。

2、解决方案11不能正确地处理Unicode文本

最后是全部总结测试（代码已经经过编写测试时间：2022年9月24日11:20:13）： 

 package eleven.莱迪娜的风声;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io. File ;
import java.io.FileInputStream;
import java.io.IO Exception ;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringWriter;
import java.nio.charset.StandardCharsets;
import java.util.Scanner;
import java.util.stream.Collectors;
import org.apache.commons.io.IOUtils;
import com.google.common.base.Charsets;
import com.google.common.io.CharStreams;
/**
* 时间：2022年9月24日11:18:17
*
* @author 莱迪娜的风声
*/public class InputStreamToChar {
public  static   void  main(String[] args) throws IOException {
InputStream inputStream = new FileInputStream(new File("Test.txt"));
one(inputStream);
two(inputStream);
three(inputStream);
four(inputStream);
five(inputStream);
six(inputStream);
seven(inputStream);
eight(inputStream);
nine(inputStream);
ten(inputStream);
eleven(inputStream);
}
public static void one(InputStream inputStream) throws IOException {
String result = IOUtils.toString(inputStream, StandardCharsets.UTF_8);
System.out.println(result);
}
public static void two(InputStream inputStream) throws IOException {
String result = CharStreams.toString(new InputStreamReader(inputStream, Charsets.UTF_8));
System.out.println(result);
}
public static void three(InputStream inputStream) throws IOException {
Scanner s = new Scanner(inputStream).useDelimiter("\\A");
String result = s.hasNext() ? s.next() : "";
System.out.println(result);
}
public static void four(InputStream inputStream) throws IOException {
String result = new BufferedReader(new InputStreamReader(inputStream)).lines()
.collect(Collectors.joining("\n"));
System.out.println(result);
}
public static void five(InputStream inputStream) throws IOException {
String result = new BufferedReader(new InputStreamReader(inputStream)).lines().parallel()
.collect(Collectors.joining("\n"));
System.out.println(result);
}
public static void six(InputStream inputStream) throws IOException {
int bufferSize = 1024;
char[] buffer = new char[bufferSize];
StringBuilder out = new StringBuilder();
Reader in = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
for (int numRead; (numRead = in.read(buffer, 0, buffer.length)) > 0;) {
out.append(buffer, 0, numRead);
}
String result = out.toString();
System.out.println(result);
}
public static void seven(InputStream inputStream) throws IOException {
StringWriter writer = new StringWriter();
IOUtils.copy(inputStream, writer, "UTF-8");
String result = writer.toString();
System.out.println(result);
}
public static void eight(InputStream inputStream) throws IOException {
ByteArrayOutputStream result = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
for (int length; (length = inputStream.read(buffer)) != -1;) {
result.write(buffer, 0, length);
}
// StandardCharsets.UTF_8.name() > JDK 7
System.out.println(result.toString("UTF-8"));
}
public static void nine(InputStream inputStream) throws IOException {
String newLine = System.getProperty("line.separator");
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder result = new StringBuilder();
for (String line; (line = reader.readLine()) != null;) {
if (result.length() > 0) {
result.append(newLine);
}
result.append(line);
}
System.out.println(result.toString());
}
public static void ten(InputStream inputStream) throws IOException {
BufferedInputStream bis = new BufferedInputStream(inputStream);
ByteArrayOutputStream buf = new ByteArrayOutputStream();
for (int result = bis.read(); result != -1; result = bis.read()) {
buf.write((byte) result);
}
// StandardCharsets.UTF_8.name() > JDK 7
System.out.println(buf.toString("UTF-8"));
}
public static void eleven(InputStream inputStream) throws IOException {
StringBuilder sb = new StringBuilder();
for (int ch; (ch = inputStream.read()) != -1;) {
sb.append((char) ch);
}
System.out.println(sb.toString());
}
}
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文章来源：智云一二三科技

文章标题：在Java中将输入流读取转换为字符串的11种方法

文章地址：https://www.zhihuclub.com/174878.shtml

关于作者: 智云科技

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