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Copy pathTFileInputStreamAndOutPut.java
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151 lines (139 loc) · 3.95 KB
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package io;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Arrays;
import org.junit.Test;
/**
* @author：chenxun
* createDate：2016年12月10日 下午4:13:04
* Theme:
* reference:
* descript:
*/
public class TFileInputStreamAndOutPut {
@Test
public void write01() throws UnsupportedEncodingException, IOException{
File file = new File("d:/io");
if(file.exists()? true:file.mkdirs()){}
file = new File("d:/io/test.txt");
if(file.exists()? true:file.createNewFile()){}
// file = File.createTempFile("我测试", ".txt", file);
FileOutputStream fileOutputStream = new FileOutputStream(file);
fileOutputStream.write("io 测试".getBytes("UTF-8"));
/*
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*/
byte[] bytes = "io 测试".getBytes("UTF-8");
for (int i = 0; i < bytes.length; i++) {
System.out.println(bytes[i]);
}
fileOutputStream.close();
}
/**
* 字符串 长度
* 字符编码：汉字utf-8:3个字节;
* 汉字gbk:2个字节;
* 字母无论utf-8还是gbk都是1个字节
* @throws IOException
*/
@Test
public void encode01() throws IOException{
String s= "io 测试";
System.out.format("s length is %s \n", s.length());
char[] charArray = s.toCharArray();
System.out.format("charArray length is %s \n", charArray.length);
for (int i = 0; i < charArray.length; i++) {
// System.out.println(charArray[i]);
printByte(String.valueOf(charArray[i]).getBytes("UTF-8"));
}
}
/**
* 1.in.available() 可以认为是移动的指针
* 2.创建byte数组
* @throws IOException
*/
@Test
public void read01() throws IOException{
InputStream in= new FileInputStream(new File("d:/io/test.txt"));
int available = in.available();
byte[] b = new byte[available];
System.out.println(in.available());
for (int i = 0; i < available; i++) {
System.out.println(in.available());
b[i] = (byte) in.read();
}
in.close();
System.out.println(new String(b, "UTF-8"));
}
/**
* 直接写入ByteArrayOutputStream 流中
* @throws IOException
*/
@Test
public void read02() throws IOException{
InputStream in= new FileInputStream(new File("d:/io/test.txt"));
byte[] b = new byte[4];
ByteArrayOutputStream outStream=new ByteArrayOutputStream();
int len = 0;
// while ((len = in.read(b))!=-1) {
// System.out.println(len);
//// printByte(b);
// outStream.write(b, 0, len);
// b = new byte[4];
// }
do {
System.out.println(len);
outStream.write(b, 0, len);
b = new byte[4];
} while ((len = in.read(b))!=-1);
System.out.println(new String(outStream.toByteArray(), "UTF-8"));
in.close();
outStream.close();
}
/**
* @throws URISyntaxException
* @throws IOException
* 读取网络资源
*/
@Test
public void readNetSourse03() throws URISyntaxException, IOException{
URL uri = new URL("http://h.hiphotos.baidu.com/image/pic/item/a2cc7cd98d1001e9460fd63bbd0e7bec54e797d7.jpg");
InputStream inputStream = uri.openStream();
File file2 = new File("d:/io");
if(!file2.exists()){
file2.mkdirs();
}
@SuppressWarnings("static-access")
FileOutputStream fileOutputStream = new FileOutputStream(file2.createTempFile("picture", ".jpg", file2));
int l;
byte[] b = new byte[1024];
while ((l= inputStream.read(b))!=-1) {
fileOutputStream.write(b, 0, l);
}
inputStream.close();
fileOutputStream.close();
}
private void printByte(byte[] b){
// StringBuilder sb = new StringBuilder();
// for (int i = 0; i < b.length; i++) {
// sb.append(b[i]+"#");
// }
// System.out.println(sb.toString());
System.out.println( Arrays.toString(b));
}
}