import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import sun.misc.BASE64Decoder;

/**
* 从xml中的属性中取出图片
*
* @author艾客
*
* jdom、dom4j从xml中的节点的属性中获取base64转换的后的字符串有问题(备注：如果这个特殊的字符串在节点下【eg：<t>经过base64编码的图片字符串</t>】，获取节点的text值在转图片，则正常)
*/
public class ConvertImage {

public static void main(String[] args) throws Exception,IOException {
String string = inputStream2String(new FileInputStream("d:\\a.xml"));

// Pattern p = Pattern.compile("PK_EventId=\"(.*?)\"");
//Pattern p = Pattern.compile("PRINTENTITY=\"([^.]*)\"");//匹配非换行符
Pattern p = Pattern.compile("PRINTENTITY=\"([\\s\\S]*)\"");//\s\S 匹配任何空白字符+匹配任何非空白字符
//Pattern p = Pattern.compile("PRINTENTITY=[\"\']([\\s\\S]*)[\"\']");
Matcher m = p.matcher(string);

String img = "";
System.out.println("===========================");
while (m.find()) {
img = m.group(1);
System.out.println(img);
}
System.out.println("===========================");

BASE64Decoder decoder = new BASE64Decoder();
byte[] data = decoder.decodeBuffer(img);
FileOutputStream os = new FileOutputStream("D:\\001.jpg");
os.write(data);
os.flush();
os.close();

}

public static String inputStream2String(InputStream inStream) throws IOException {
String lineSeparator = System.getProperty("line.separator");

StringBuffer sb = new StringBuffer();
BufferedReader bufferReader = new BufferedReader(new InputStreamReader(inStream,"UTF-8"));
String str = null;
while ((str = bufferReader.readLine()) != null) {
sb.append(str + lineSeparator);
}
if (null == sb || sb.length() == 0) {
return null;
}

return sb.toString(); } }