JavaCodeByJava

Sunday, 10 December 2017

Implement Spring Retry in Spring Boot

<groupId>org.aspectj</groupId>

<artifactId>aspectjweaver</artifactId>

</dependency>

<groupId>org.springframework.retry</groupId>

<artifactId>spring-retry</artifactId>

<version>1.1.5.RELEASE</version>

</dependency>

@EnableRetry

@SpringBootApplication

@ComponentScan(basePackages="com.example")

@EnableAutoConfiguration

public class SampleApplication extends SpringBootServletInitializer{

///.....

}

@Service

public class MyService {

@Retryable(value = {
IndexOutOfBoundsException.class, Exception.class}, maxAttempts = 10, backoff = @Backoff(delay = 5000))

public void retryWithException() {

System.out.println("running......");

List<Integer> list = new ArrayList<>();

list.get(3);

}

@RequestMapping(value="/testRetry",method=RequestMethod.GET)

public @ResponseBody String retry(){

System.out.println("requestReceived::"+"/retry");

myservice.retryWithException();

return "done";

}

output:

requestReceived::/retry

running......

2017-12-10 19:24:26.924 ERROR 30540 --- [io-8080-exec-17] o.s.boot.web.support.ErrorPageFilter : Forwarding to error page from request [/testRetry] due to exception [Index: 3, Size: 0]

java.lang.IndexOutOfBoundsException: Index: 3, Size: 0

at java.util.ArrayList.rangeCheck(ArrayList.java:653) ~[na:1.8.0_144]

at java.util.ArrayList.get(ArrayList.java:429) ~[na:1.8.0_144]

//recover after retry

//add below in MyService class

@Recover

public void recover(IndexOutOfBoundsException exception) {

System.out.println("ah... catch");

}

output:

requestReceived::/retry
running......
running......
running......
running......
running......
running......
running......
running......
running......
running......
ah... catch

Sunday, 12 November 2017

Hibernate one to one mapping usnig boot

Below sample code for hibernate one to one mapping:

https://github.com/Sushil21/HibernateOneToOneMapping

I have used lib lombok also in this project so must integrate lombok in Eclipse/STS:

https://projectlombok.org/setup/eclipse

Saturday, 11 November 2017

Create Spring Boot Sample Project

You can download a running sample of spring boot on below link:

https://github.com/Sushil21/SpringBootSample

Add Image Water Mark on Image in JAVA

Below code for add image water mark on image in java:

import java.awt.AlphaComposite;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.File;

import javax.imageio.ImageIO;

public class TestImage41im {

public static void main(String[] args) {

try {

File sourceImageFile = new File("originalImagePath/originalimage.jpg");

File destImageFile = new File("destinationImagePath/destinationImage.png");

File watermarkImageFile = new File("waterMarkImagePath/watermark.png");

BufferedImage sourceImage = ImageIO.read(sourceImageFile);

BufferedImage watermarkImage = ImageIO.read(watermarkImageFile);

// graphic properties

Graphics2D g2d = (Graphics2D) sourceImage.getGraphics();

AlphaComposite alphaChannel = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.3f); //add transparency of watermark image

g2d.setComposite(alphaChannel);

//coordinate where the image is painted below are the center

int x = (sourceImage.getWidth() - watermarkImage.getWidth()) / 2;

int y = (sourceImage.getHeight() - watermarkImage.getHeight()) / 2;

// draw the image watermark

g2d.drawImage(watermarkImage, x, y, null);

ImageIO.write(sourceImage, "png", destImageFile);

g2d.dispose();

System.out.println("The image watermark is added to the image.");

}catch (Exception e) {

// TODO: handle exception

}

Add Text Water mark on Image in JAVA

Below code for add text water mark on image in JAVA:

import java.awt.AlphaComposite;

import java.awt.Color;

import java.awt.Font;

import java.awt.FontMetrics;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.File;

import javax.imageio.ImageIO;

import com.itextpdf.awt.geom.Dimension;

public class TextWaterMarkOnImage {

public static void main(String[] args) {

try {

File sourceImageFile = new File("originalFilePath/original.jpg");

File destImageFile = new File("watermarkedFilePath/watermarked.png");

BufferedImage sourceImage = ImageIO.read(sourceImageFile);

Graphics2D g2d = (Graphics2D) sourceImage.getGraphics();

AlphaComposite alphaChannel = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.3f); //set transparency of watermark

g2d.setComposite(alphaChannel);

g2d.setColor(Color.BLACK);

Font font = new Font("Arial", Font.BOLD, 64); //font of text

g2d.setFont(font);

String text = "Checked"; //watermark text

Dimension dmDimension = getDimentionOfText(g2d, font, text);

int centerX = sourceImage.getWidth()/2 - (int)dmDimension.getWidth()/2;

int centerY = sourceImage.getHeight()/2 + (int)dmDimension.getHeight()/2;

// paints the textual watermark

g2d.drawString(text, centerX, centerY);

ImageIO.write(sourceImage, "png", destImageFile);

g2d.dispose();

System.out.println("The text watermark is added to the image.");

}catch (Exception e) {

// TODO: handle exception

}

public static Dimension getDimentionOfText(Graphics2D g2d, Font font , String text) {

// get metrics from the graphics

FontMetrics metrics = g2d.getFontMetrics(font);

// get the height of a line of text in this

// font and render context

int hgt = metrics.getHeight();

// get the advance of my text in this font

// and render context

int adv = metrics.stringWidth(text);

// calculate the size of a box to hold the

// text with some padding.

Dimension size = new Dimension(adv+2, hgt+2);

System.out.println(size.getHeight() +" "+ size.getWidth());

return size;

}

Add image water mark on PDF in JAVA using iText

Below code for add image water mark on PDF using iText:

import java.io.FileOutputStream;

import java.io.IOException;

import com.itextpdf.text.DocumentException;

import com.itextpdf.text.Image;

import com.itextpdf.text.Rectangle;

import com.itextpdf.text.pdf.PdfContentByte;

import com.itextpdf.text.pdf.PdfGState;

import com.itextpdf.text.pdf.PdfReader;

import com.itextpdf.text.pdf.PdfStamper;

public class ImageWaterMarkOnPdf {

public static void main(String... args) {

try {

PdfReader reader = new PdfReader("originalfilepath/otiginal.pdf");

PdfStamper stamper = new PdfStamper(reader,

new FileOutputStream("outputfilepath/output.pdf"));

// image watermark

Image img = Image.getInstance("watermarkfilepath/watermark.png");

float w = img.getScaledWidth();

float h = img.getScaledHeight();

// properties

PdfContentByte over;

Rectangle pagesize;

float x, y;

// add water mark on all pages

int n = reader.getNumberOfPages();

for (int i = 1; i <= n; i++) {

// get page size and position for add water mark

pagesize = reader.getPageSizeWithRotation(i);

x = (pagesize.getLeft() + pagesize.getRight()) / 2;

y = (pagesize.getTop() + pagesize.getBottom()) / 2;

over = stamper.getOverContent(i);

over.saveState();

// set transparency

PdfGState state = new PdfGState();

state.setFillOpacity(0.2f); //more transparent

over.setGState(state);

// add image water mark center

over.addImage(img, w, 0, 0, h, x - (w / 2), y - (h / 2));

over.restoreState();

}

stamper.close();

reader.close();

}catch (IOException e) {

// TODO: handle exception

}catch (DocumentException e) {