json转换成图片工具类

json2picture
项目开发中会遇到,后端生成的json转换二维码,前台页面可以显示，这个需求怎么做？
1:我们知道前端页面直接写base64码,就会显示图片

2:那么后端只要把json转换为base64码传给前段不就可以了吗？
分析到此结束,直接上代码。

-----------------------------QRCodeUtil工具类-----------------------------------------------

package com.**.utilities;import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Hashtable;
import java.util.Random;import javax.imageio.ImageIO;import com.google.gson.JsonObject;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import sun.misc.BASE64Encoder;/*** 二维码工具类** @author GeekPlusA* @date 2018-10-19*/
public class QRCodeUtil {private static final String CHARSET = "utf-8";private static final String FORMAT = "JPG";// 二维码尺寸private static final int QRCODE_SIZE = 300;// LOGO宽度private static final int LOGO_WIDTH = 60;// LOGO高度private static final int LOGO_HEIGHT = 60;private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);hints.put(EncodeHintType.CHARACTER_SET, CHARSET);hints.put(EncodeHintType.MARGIN, 1);BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,hints);int width = bitMatrix.getWidth();int height = bitMatrix.getHeight();BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);for (int x = 0; x < width; x++) {for (int y = 0; y < height; y++) {image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);}}if (logoPath == null || "".equals(logoPath)) {return image;}// 插入图片QRCodeUtil.insertImage(image, logoPath, needCompress);return image;}/*** 插入LOGO** @param source       二维码图片* @param logoPath     LOGO图片地址* @param needCompress 是否压缩* @throws Exception*/private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception {File file = new File(logoPath);if (!file.exists()) {throw new Exception("logo file not found.");}Image src = ImageIO.read(new File(logoPath));int width = src.getWidth(null);int height = src.getHeight(null);if (needCompress) { // 压缩LOGOif (width > LOGO_WIDTH) {width = LOGO_WIDTH;}if (height > LOGO_HEIGHT) {height = LOGO_HEIGHT;}Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics g = tag.getGraphics();g.drawImage(image, 0, 0, null); // 绘制缩小后的图g.dispose();src = image;}// 插入LOGOGraphics2D graph = source.createGraphics();int x = (QRCODE_SIZE - width) / 2;int y = (QRCODE_SIZE - height) / 2;graph.drawImage(src, x, y, width, height, null);Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);graph.setStroke(new BasicStroke(3f));graph.draw(shape);graph.dispose();}/*** 生成二维码(内嵌LOGO)* 二维码文件名随机，文件名可能会有重复** @param content      内容* @param logoPath     LOGO地址* @param destPath     存放目录* @param needCompress 是否压缩LOGO* @throws Exception*/public static String encode(String content, String logoPath, String destPath, boolean needCompress) throws Exception {BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);mkdirs(destPath);String fileName = new Random().nextInt(99999999) + "." + FORMAT.toLowerCase();ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));return fileName;}/*** 生成二维码(内嵌LOGO)* 调用者指定二维码文件名** @param content      内容* @param logoPath     LOGO地址* @param destPath     存放目录* @param fileName     二维码文件名* @param needCompress 是否压缩LOGO* @throws Exception*/public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception {BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);mkdirs(destPath);fileName = fileName.substring(0, fileName.indexOf(".") > 0 ? fileName.indexOf(".") : fileName.length())+ "." + FORMAT.toLowerCase();ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));return fileName;}/*** 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．* (mkdir如果父目录不存在则会抛出异常)** @param destPath 存放目录*/public static void mkdirs(String destPath) {File file = new File(destPath);if (!file.exists() && !file.isDirectory()) {file.mkdirs();}}/*** 生成二维码(内嵌LOGO)** @param content  内容* @param logoPath LOGO地址* @param destPath 存储地址* @throws Exception*/public static String encode(String content, String logoPath, String destPath) throws Exception {return QRCodeUtil.encode(content, logoPath, destPath, false);}/*** 生成二维码** @param content      内容* @param destPath     存储地址* @param needCompress 是否压缩LOGO* @throws Exception*/public static String encode(String content, String destPath, boolean needCompress) throws Exception {return QRCodeUtil.encode(content, null, destPath, needCompress);}/*** 生成二维码** @param content  内容* @param destPath 存储地址* @throws Exception*/public static String encode(String content, String destPath) throws Exception {return QRCodeUtil.encode(content, null, destPath, false);}/*** 生成二维码(内嵌LOGO)** @param content      内容* @param logoPath     LOGO地址* @param output       输出流* @param needCompress 是否压缩LOGO* @throws Exception*/public static void encode(String content, String logoPath, OutputStream output, boolean needCompress)throws Exception {BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);ImageIO.write(image, FORMAT, output);}/*** 生成二维码** @param content 内容* @param output  输出流* @throws Exception*/public static void encode(String content, OutputStream output) throws Exception {QRCodeUtil.encode(content, null, output, false);}/*** 解析二维码** @param file 二维码图片* @return* @throws Exception*/public static String decode(File file) throws Exception {BufferedImage image;image = ImageIO.read(file);if (image == null) {return null;}BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));Result result;Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();hints.put(DecodeHintType.CHARACTER_SET, CHARSET);result = new MultiFormatReader().decode(bitmap, hints);String resultStr = result.getText();return resultStr;}/*** 解析二维码** @param path 二维码图片地址* @return* @throws Exception*/public static String decode(String path) throws Exception {return QRCodeUtil.decode(new File(path));}/*** 二维码转换为base64字符串** @param path 二维码图片地址* @return* @throws Exception*/public static String image2base64(String path) {String imgStr = "";try {File file = new File(path);FileInputStream fis = new FileInputStream(file);byte[] buffer = new byte[(int) file.length()];int offset = 0;int numRead = 0;while (offset < buffer.length && (numRead = fis.read(buffer, offset, buffer.length - offset)) >= 0) {offset += numRead;}if (offset != buffer.length) {throw new IOException("Could not completely read file "+ file.getName());}fis.close();BASE64Encoder encoder = new BASE64Encoder();imgStr = encoder.encode(buffer);} catch (Exception e) {e.printStackTrace();}return "data:image/jpeg;base64," + imgStr;}/*** json转换为base64字符串** @param json json字符串* @return* @throws Exception*/public static String json2base64(String json){String path = "D:\\";String base64Str = null;try{String str = QRCodeUtil.encode(json,path);base64Str = QRCodeUtil.image2base64(path + str);}catch (Exception e){e.getMessage();}return StringUtil.leftRightCenterTrim(base64Str);}public static void main(String[] args) throws Exception {String text = "{ \"GeekPlusA\": \"GeekPlusA\", \"GeekPlusA\": \"GeekPlusA\" }";String json = QRCodeUtil.json2base64(text);System.out.println(json);System.out.println(StringUtil.leftRightCenterTrim(json));}}

-----------------------------StringUtil工具类-----------------------------------------------

package com.**.utilities;import com.google.common.base.Strings;import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;/*** 字符串操作的帮助函数** @author GeekPlusA*/
public abstract class StringUtil {/*** 去掉字符串前后中间空白、换行、制表** @param str 字符串* @return 新字符串*/public static String leftRightCenterTrim(String str){String dest = "";if (null != str) {Pattern p = Pattern.compile("\\s*|\t|\r|\n");Matcher m = p.matcher(str);dest = m.replaceAll("");}return dest;}
}

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