📅 最后修改于: 2020-09-27 07:24:53 🧑 作者: Mango
Java StringWriter类是一个字符流，可从字符串缓冲区收集输出，该缓冲区可用于构造字符串。 StringWriter类继承Writer类。
在StringWriter类中，未使用系统资源(例如网络套接字和文件)，因此不需要关闭StringWriter。
让我们看一下Java.io.StringWriter类的声明：
public class StringWriter extends Writer
| Method | Description |
|---|---|
| void write(int c) | It is used to write the single character. |
| void write(String str) | It is used to write the string. |
| void write(String str, int off, int len) | It is used to write the portion of a string. |
| void write(char[] cbuf, int off, int len) | It is used to write the portion of an array of characters. |
| String toString() | It is used to return the buffer current value as a string. |
| StringBuffer getBuffer() | It is used t return the string buffer. |
| StringWriter append(char c) | It is used to append the specified character to the writer. |
| StringWriter append(CharSequence csq) | It is used to append the specified character sequence to the writer. |
| StringWriter append(CharSequence csq, int start, int end) | It is used to append the subsequence of specified character sequence to the writer. |
| void flush() | It is used to flush the stream. |
| void close() | It is used to close the stream. |
让我们看一下使用BufferedReader从流中读取文件数据的StringWriter的简单示例。
import java.io.*;
public class StringWriterExample {
public static void main(String[] args) throws IOException {
char[] ary = new char[512];
StringWriter writer = new StringWriter();
FileInputStream input = null;
BufferedReader buffer = null;
input = new FileInputStream("D://testout.txt");
buffer = new BufferedReader(new InputStreamReader(input, "UTF-8"));
int x;
while ((x = buffer.read(ary)) != -1) {
writer.write(ary, 0, x);
}
System.out.println(writer.toString());
writer.close();
buffer.close();
}
}
testout.txt：
Javatpoint provides tutorial in Java, Spring, Hibernate, Android, PHP etc.
输出：
Javatpoint provides tutorial in Java, Spring, Hibernate, Android, PHP etc.