檔案流轉換為base64碼 和 base64碼轉換為檔案流
阿新 • • 發佈：2019-01-04
package test.com.cs;
import com.cs.Base64Convert;
import junit.framework.TestCase;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.logging.Logger;
public class TestBase64Convert extends TestCase {
Base64Convert baseCov = null;
public TestBase64Convert(String s) {
super(s);
}
protected void setUp() throws Exception {
baseCov = new Base64Convert();
}
protected void tearDown() throws Exception {
super.tearDown();
}
public void testIoToBase64() {
try {
String strBase64 = baseCov.ioToBase64(); //將 io 轉換為 base64編碼
System.out.println(">>> "+strBase64);
baseCov.base64ToIo(strBase64); //將 base64編碼轉換為 io 檔案流，生成一幅新圖片
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
------------------------------------
package com.cs;
import sun.misc.BASE64Decoder;
import sun.misc.
import java.io.*;
public class Base64Convert {
BASE64Decoder decoder = new BASE64Decoder();
public String ioToBase64() throws IOException {
String fileName = "d:/gril.gif"; //原始檔
String strBase64 = null;
try {
InputStream in = new FileInputStream(fileName);
// in.available()返回檔案的位元組長度
byte[] bytes = new byte[in.available()];
// 將檔案中的內容讀入到陣列中
in.read(bytes);
strBase64 = new BASE64Encoder().encode(bytes); //將位元組流陣列轉換為字串
in.close();
} catch (FileNotFoundException fe) {
fe.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
}
return strBase64;
}
public void base64ToIo(String strBase64) throws IOException {
String string = strBase64;
String fileName = "d:/gril2.gif"; //生成的新檔案
try {
// 解碼，然後將位元組轉換為檔案
byte[] bytes = new BASE64Decoder().decodeBuffer(string); //將字串轉換為byte陣列
ByteArrayInputStream in = new ByteArrayInputStream(bytes);
byte[] buffer = new byte[1024];
FileOutputStream out = new FileOutputStream(fileName);
int bytesum = 0;
int byteread = 0;
while ((byteread = in.read(buffer)) != -1) {
bytesum += byteread;
out.write(buffer, 0, byteread); //檔案寫操作
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
執行截圖：gril2.gif就是根據base64編碼轉換過來的，看到谷歌的這個美女總裁，就說明你的程式成功了
import com.cs.Base64Convert;
import junit.framework.TestCase;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.logging.Logger;
public class TestBase64Convert extends TestCase {
Base64Convert baseCov = null;
public TestBase64Convert(String s) {
super(s);
}
protected void setUp() throws Exception {
baseCov = new Base64Convert();
}
protected void tearDown() throws Exception {
super.tearDown();
}
public void testIoToBase64() {
try {
String strBase64 = baseCov.ioToBase64(); //將 io 轉換為 base64編碼
System.out.println(">>> "+strBase64);
baseCov.base64ToIo(strBase64); //將 base64編碼轉換為 io 檔案流，生成一幅新圖片
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
------------------------------------
package com.cs;
import sun.misc.BASE64Decoder;
import sun.misc.
import java.io.*;
public class Base64Convert {
BASE64Decoder decoder = new BASE64Decoder();
public String ioToBase64() throws IOException {
String fileName = "d:/gril.gif"; //原始檔
String strBase64 = null;
try {
InputStream in = new FileInputStream(fileName);
// in.available()返回檔案的位元組長度
byte[] bytes = new byte[in.available()];
// 將檔案中的內容讀入到陣列中
in.read(bytes);
strBase64 = new BASE64Encoder().encode(bytes); //將位元組流陣列轉換為字串
in.close();
} catch (FileNotFoundException fe) {
fe.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
}
return strBase64;
}
public void base64ToIo(String strBase64) throws IOException {
String string = strBase64;
String fileName = "d:/gril2.gif"; //生成的新檔案
try {
// 解碼，然後將位元組轉換為檔案
byte[] bytes = new BASE64Decoder().decodeBuffer(string); //將字串轉換為byte陣列
ByteArrayInputStream in = new ByteArrayInputStream(bytes);
byte[] buffer = new byte[1024];
FileOutputStream out = new FileOutputStream(fileName);
int bytesum = 0;
int byteread = 0;
while ((byteread = in.read(buffer)) != -1) {
bytesum += byteread;
out.write(buffer, 0, byteread); //檔案寫操作
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
執行截圖：gril2.gif就是根據base64編碼轉換過來的，看到谷歌的這個美女總裁，就說明你的程式成功了