java 把上传截图到服务器
(1)从JTextArea或java swing的其他组件获取截图
/***
* convert JTextArea to image
* @param ta
* @param destFile : java.io.File or OutputStream
* @param format
* @param multiple : 分辨率倍数
*/
public static BufferedImage generateImage(JComponent ta, Object destFile, String format, Integer specifiedHeight, Integer specifiedWidth, int multiple) {
int height=ta.getHeight();
int width=ta.getWidth();
if(specifiedHeight!=null&&specifiedHeight!=SystemHWUtil.NEGATIVE_ONE){//如果指定了高度
height=specifiedHeight;
}
if(specifiedWidth!=null&&specifiedWidth!=SystemHWUtil.NEGATIVE_ONE){//如果指定了高度
width=specifiedWidth;
}
BufferedImage img = new BufferedImage(width * multiple, height * multiple, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = img.createGraphics();
g2d.scale(multiple, multiple);
/*g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
Ellipse2D.Double e = new Ellipse2D.Double(300D - DOT_SIZE,
200D - DOT_SIZE, DOT_SIZE + DOT_SIZE, DOT_SIZE + DOT_SIZE);
g2d.setColor(Color.YELLOW);
g2d.fill(e);*/
ta.printAll(g2d);
g2d.dispose();
if(!ValueWidget.isNullOrEmpty(destFile)){
if (destFile instanceof File) {//把截图保存到文件
File file = (File) destFile;
try {
ImageIO.write(img, format/*"jpg"*/, file);
} catch (IOException ex) {
ex.printStackTrace();
}
} else if (destFile instanceof OutputStream) {
OutputStream outputStream = (OutputStream) destFile;
try {
ImageIO.write(img, format/*"jpg"*/, outputStream);
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
return img;
}
(2)把截图转化为字节数组
实际上是把BufferedImage转化为byte[]
/**
* 把BufferedImage 转化为字节数组
*
* @param img
* @return
*/
public static ByteArrayOutputStream imageToByteArrayOutputStream(BufferedImage img, String formatName) {
//创建储存图片二进制流的输出流
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
//创建ImageOutputStream流
ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(baos);
//将二进制数据写进ByteArrayOutputStream
ImageIO.write(img, formatName, imageOutputStream);
} catch (IOException e) {
e.printStackTrace();
}
return baos;
}
(3)使用HttpURLConnection发送http请求
public static void uploadFile(String formatName, byte[] bytes, String uploadedFileName) {
String size = FileUtils.formatSize(bytes.length);
int resultOption = JOptionPane.showConfirmDialog(null, "Are you sure to Upload " + size + " to Server ?", "确认",
JOptionPane.OK_CANCEL_OPTION);
if (resultOption != JOptionPane.OK_OPTION) {
ToastMessage.toast("取消上传", 2000, Color.red);
return;
}
try {
String result = HttpSocketUtil.uploadFile("http://blog.yhskyc.com/convention2/ajax_image/upload", bytes,
uploadedFileName + "." + formatName, (Map<String, String>) null);
Map requestMap = null;
try {
requestMap = (Map) HWJacksonUtils.deSerialize(result, Map.class);
StringBuffer stringBuffer = new StringBuffer("<html>");
for (Object obj : requestMap.keySet()) {
Object val = requestMap.get(obj);
stringBuffer.append("<div style=\"padding-bottom:5px;margin-bottom: 5px;border: 1px solid #f38399;border-radius: 5px;\" >");
stringBuffer.append("<span style=\"color: #ddd;\" >").append(obj).append("</span>").append(":").append("<br />");
stringBuffer.append(val).append("</div>");
}
stringBuffer.append("</html>");
// System.out.println(stringBuffer);
ToastMessage.toast("上传成功", 2000);
CustomDefaultDialog customDefaultDialog = new CustomDefaultDialog(stringBuffer.toString(), "图片路径", true, null, 800);
customDefaultDialog.setVisible(true);
// ComponentUtil.appendResult(area2,result,true,false);
} catch (JsonParseException e1) {
e1.printStackTrace();
} catch (JsonMappingException e1) {
e1.printStackTrace();
}
System.out.println(result);
} catch (Exception e) {
e.printStackTrace();
}
}
/***
* 上传BufferedImage 到远程服务器
* @param img
*/
public static void uploadBufferedImage(BufferedImage img) {
String formatName = "jpg";
ByteArrayOutputStream baos = imageToByteArrayOutputStream(img, formatName);
//输出数组
byte[] bytes = baos.toByteArray();
uploadFile(formatName, bytes, "Screenshots");
}
