Java中经常会遇到图片上传,
package test;/**
* Created by chenjia on 2018/5/16.
*/
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import java.awt.image.ImagingOpException;
import java.io.*;
/**
* @author chenjia
* @create 2018-05-16 17:15
* @desc
**/
public class Test64Bit {
public static void main(String[] args){
String imageStr = getImageStr("报告列表.png");
System.out.println(imageStr);
GenerateImage(imageStr,"生成图片");
}
public static String getImageStr(String imgFilePath){
byte[] data = null;
try {
InputStream in = new FileInputStream(new File(imgFilePath));
final File file = new File(imgFilePath);
if (file.exists()) {
System.out.println("存在");
}
data = new byte[in.available()];
System.out.println(data.toString());
in.read(data);
in.close();
}catch (IOException exception){
exception.printStackTrace();
}
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);
}
public static boolean GenerateImage(String imgStr, String imgFilePath) {// 对字节数组字符串进行Base64解码并生成图片
if (imgStr == null) // 图像数据为空
return false;
BASE64Decoder decoder = new BASE64Decoder();
try {
// Base64解码
byte[] bytes = decoder.decodeBuffer(imgStr);
for (int i = 0; i < bytes.length; ++i) {
if (bytes[i] < 0) {// 调整异常数据
bytes[i] += 256;
}
}
// 生成jpeg图片
OutputStream out = new FileOutputStream(imgFilePath);
out.write(bytes);
out.flush();
out.close();
File file = new File(imgFilePath);
System.out.println(file.getAbsolutePath());
System.out.println(file.getPath());
file.renameTo(new File(imgFilePath+".png"));
System.out.println(file.getAbsolutePath());
System.out.println(file.getPath());
return true;
} catch (Exception e) {
return false;
}
}
}