IOの数据流

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</pre><pre code_snippet_id="1696412" snippet_file_name="blog_20160525_2_8740433" name="code" class="java">

package IO;import java.io.DataInput;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.PrintStream;import javax.xml.crypto.Data;import org.junit.Test;public class TestOtherStream {@Testpublic void TestData() {DataInputStream dataInput = null;try {dataInput = new DataInputStream(new FileInputStream(new File("data.txt")));//byte[] bs = new byte[20];//int len;//while ((len = dataInput.read(bs)) != -1) {////System.out.println(new String(bs, 0, len));//}String string=dataInput.readUTF();System.out.println(string);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if (dataInput != null) {try {dataInput.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}// 数据流：处理基本数据类型、String、字节数组的数据// DataInputStream和DataOutputStream,分别套接在InputStream和OutputStream节点流上// 没有reader和writer因为不是文本@Testpublic void Data() {DataOutputStream dataOutputStream = null;try {FileOutputStream fileOutputStream = new FileOutputStream("data.txt");dataOutputStream = new DataOutputStream(fileOutputStream);dataOutputStream.writeUTF("I love u but u dont know ！");dataOutputStream.writeBoolean(true);dataOutputStream.writeLong(34153454);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if (dataOutputStream != null) {try {dataOutputStream.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}// 打印流：字节流PrintStream字符流PrintWriter@Testpublic void printStreamWriter() {FileOutputStream fileOutputStream = null;try {fileOutputStream = new FileOutputStream(new File("print.txt"));} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}// 创建打印输出流，设置为自动刷新模式（写入换行符或字节'\n',时会刷新输出缓冲区）PrintStream pStream = new PrintStream(fileOutputStream, true);// 把标准输出流（控制台输出）改成文件输出if (pStream != null) {System.setOut(pStream);}for (int i = 0; i < 255; i++) {System.out.print((char) i);// 输出ASCII字符if (i % 50 == 0) {System.out.println();// 每50个数据换行}}pStream.close();}}

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