Base64字符串解碼成png或者pdf

package Demo;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;

import sun.misc.BASE64Decoder;

public class txttest {
/**
*
* @param file
* @return
*/
public static String txt2String(File file){
StringBuilder result = new StringBuilder();
try{
BufferedReader br = new BufferedReader(new FileReader(file));
String s = null;
String str="";
while((s = br.readLine())!=null){
str=str+s;
}
br.close();
base64StringToPDF(str);
}catch(Exception e){
e.printStackTrace();
}
return result.toString();
}

public static void main(String[] args){
File file = new File("D:/3.txt");
txt2String(file);
}
public static void base64StringToPDF(String base64sString){
BufferedInputStream bin = null;
FileOutputStream fout = null;
BufferedOutputStream bout = null;
try {
BASE64Decoder decoder = new BASE64Decoder();
byte[] bytes = decoder.decodeBuffer(base64sString);
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
bin = new BufferedInputStream(bais);
File file = new File("D:/165.png");
fout = new FileOutputStream(file);
bout = new BufferedOutputStream(fout);
byte[] buffers = new byte[1024];
int len = bin.read(buffers);
while(len != -1){
bout.write(buffers, 0, len);
len = bin.read(buffers);
}
bout.flush();

} catch (IOException e) {
e.printStackTrace();
}finally{
try {
bin.close();
fout.close();
bout.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

}

/**

樓主測試的是轉成png，轉成pdf只須要將後綴修改一下就行

**/