一、将本地图片转换成Base64编码字符串
/**
* 将本地图片转换成Base64编码字符串
*
* @param imgFile 图片目录路径
* @return
*/
public static String getImgFileToBase64(String imgFile) {
//将图片文件转化为字节数组字符串，并对其进行Base64编码处理
InputStream inputStream = null;
byte[] buffer = null;
//读取图片字节数组
try {
inputStream = new FileInputStream(imgFile);
int count = 0;
while (count == 0) {
count = inputStream.available();
}
buffer = new byte[count];
inputStream.read(buffer);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
// 关闭inputStream流
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
// 对字节数组Base64编码
return new BASE64Encoder().encode(buffer);
}
二、将网络图片转换成Base64编码字符串
/**
* 将网络图片转换成Base64编码字符串
*
* @param imgUrl 网络图片Url
* @return
*/
public static String getImgUrlToBase64(String imgUrl) {
InputStream inputStream = null;
ByteArrayOutputStream outputStream = null;
byte[] buffer = null;
try {
// 创建URL
URL url = new URL(imgUrl);
// 创建链接
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
inputStream = conn.getInputStream();
outputStream = new ByteArrayOutputStream();
// 将内容读取内存中
buffer = new byte[1024];
int len = -1;
while ((len = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, len);
}
buffer = outputStream.toByteArray();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
// 关闭inputStream流
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (outputStream != null) {
try {
// 关闭outputStream流
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
// 对字节数组Base64编码
return new BASE64Encoder().encode(buffer);
}
三、将网络链接图片或者本地图片文件转换成Base64编码字符串（就是对上面的两种进行整合）
/**
* 将网络链接图片或者本地图片文件转换成Base64编码字符串
*
* @param imgStr 网络图片Url/本地图片目录路径
* @return
*/
public static String getImgStrToBase64(String imgStr) {
InputStream inputStream = null;
ByteArrayOutputStream outputStream = null;
byte[] buffer = null;
try {
//判断网络链接图片文件/本地目录图片文件
if (imgStr.startsWith("http://") || imgStr.startsWith("https://")) {
// 创建URL
URL url = new URL(imgStr);
// 创建链接
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
inputStream = conn.getInputStream();
outputStream = new ByteArrayOutputStream();
// 将内容读取内存中
buffer = new byte[1024];
int len = -1;
while ((len = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, len);
}
buffer = outputStream.toByteArray();
} else {
inputStream = new FileInputStream(imgStr);
int count = 0;
while (count == 0) {
count = inputStream.available();
}
buffer = new byte[count];
inputStream.read(buffer);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
// 关闭inputStream流
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (outputStream != null) {
try {
// 关闭outputStream流
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
// 对字节数组Base64编码
return new BASE64Encoder().encode(buffer);
}
四、将图片Base64编码转换成img图片文件（解码）
/**
* 将图片Base64编码转换成img图片文件
*
* @param imgBase64 图片Base64编码
* @param imgPath 图片生成路径
* @return
*/
public static boolean getImgBase64ToImgFile(String imgBase64, String imgPath) {
boolean flag = true;
OutputStream outputStream = null;
try {
// 解密处理数据
byte[] bytes = new BASE64Decoder().decodeBuffer(imgBase64);
for (int i = 0; i < bytes.length; ++i) {
if (bytes[i] < 0) {
bytes[i] += 256;
}
}
outputStream = new FileOutputStream(imgPath);
outputStream.write(bytes);
} catch (Exception e) {
e.printStackTrace();
flag = false;
} finally {
if (outputStream != null) {
try {
// 关闭outputStream流
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return flag;
}
