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imagebase64java

发布时间:2025-07-17 04:13:55

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js铡嬬缉锲剧墖鍒板浐瀹氩儚绱犱互鍐咃纴500k涓轰緥

链鏂囨棬鍦ㄦ帰绌秊s铡嬬缉锲剧墖镄勪袱绉嶆柟寮:

鏀瑰彉锲剧墖闀垮

,

鏀瑰彉锲剧墖璐ㄩ噺

,鍜岀粨钖堜简浠ヤ笂涓よ呯殑

链缁堟柟妗

棣栧厛,阒呰绘湰鏂囬渶瑕佺煡阆揷anvas镄勪袱涓鏂规硶

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鎴戣瘯镌鐢ㄤ竴涓鐜版垚镄勪緥瀛愬幓璺戜简涓涓,涓涓1.7M镄勫浘鐗囧帇缂╁埌浜23k,鍫绉板儚绱犵骇姣佺伃镐х牬鍧忋

锅囧备竴寮犲ぇ锲惧彲鑳藉寘钖镌寰埚氭枃瀛楃瓑鍏抽敭淇℃伅,蹇呴’涓娄紶涔嫔悗浣跨敤鏂硅兘娓呮榈杈ㄨゃ傛墍浠ヨ佸帇缂╀箣钖庤川閲忓敖鍙鑳芥帴杩500k镄勚500k镀忕礌浠ュ唴,灏辨槸鑻ヤ竴寮犲浘瀹藉害涓1024,鍒欓珮搴︿笉鑳借秴杩500銆傚洜涓哄浘鐗囨湁鍏朵粬镄勪俊鎭,涔熸槸瑕佸崰澶у皬镄勚傚嵆涓嶅缑澶т簬

1024*500

镓浠,镙规嵁闇姹,涓娄紶锲剧墖涓嶈兘瓒呰繃500k镄勬儏鍐典笅灏藉彲鑳戒缭鐣椤浘鐗囩殑娓呮榈搴︺傚綋铹跺傛灉鍙浠ョ殑𨱍呭喌涓嬬敤涓婇溃鎻愬埌镄勮剧疆铡嬬缉绋嫔害涓0.9,0.8璇曡瘯鐪,锲剧墖璐ㄩ噺鍙浠ユ帴鍙,澶у皬浼氭湁澶у箙搴︾殑缂╁皬銆

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杩欑嶆柟娉曟湁鍙鑳芥渶钖庡缑鍑虹殑锲剧墖镄勫ぇ灏忎细鐣ュぇ浜庤勫畾澶у皬,铡熷洜涓婃枃涔熸彁鍒拌繃浜,濡傛灉𨱍充娇鐢ㄨ繖绉嶆柟娉,鍙镊琛屽啀璋冩暣涓涓嬨

涓婇溃镄勬柟娉曟湁涓闂棰,灏辨槸鏀瑰彉浜嗗浘鐗囩殑铡熷嬮暱瀹姐傚傛灉涓涓锲剧殑闀垮借冻澶熷ぇ,铡嬬缉锲剧墖璐ㄩ噺,绯娄竴镣逛絾鏄鍐呭圭湅寰楁竻涔熸槸ok镄勫槢銆傛墍浠,璺熶笂闱㈠悓鐞,鎴戜滑鍙浠ヤ笉鏂璋冩暣锲剧墖镄勮川閲忚惧畾鐩村埌澶у皬钖堥,闾d箞,濡备綍鍦ㄥ浘鐗囦笂浼犱箣鍓岖煡阆揿浘鐗囩殑澶у皬锻?

棣栧厛,闇瑕佺煡阆撶殑涓镣规槸,铡嬬缉涔嫔悗𨰾垮埌镄刡ase64瀛楃︿覆浼氲浆鎴恇lob瀵硅薄,铹跺悗浼犵粰链嶅姟绔銆

鍙浠ユ煡阒呮枃妗,blob瀵硅薄链変釜灞炴ф槸size

杩欎釜size灏辨槸涓娄紶涔嫔悗瀹为檯镄勬枃浠跺ぇ灏忋

鍙傜収涓婇溃镄勬濊矾,鍙浠ユ疮娆℃敼鍙('image/'+fileType,level);level镄勫,铡昏皟鏁村帇缂╁浘鐗囱川閲,铹跺悗鐢╞lob瀵硅薄镄剆ize铡婚獙璇佹槸钖︽弧瓒500k浠ュ唴镄勯渶姹伞

鍏充簬镄刲evel鍒板簳鏄镐庝箞璁$畻镄,MDN鏂囨。閲屼篃娌¤,鍐欎简涓寰鐜涓娆″噺灏0.1镄刲evel铡嬬缉浜嗗嚑涓锲剧墖

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鍦ㄥ紑濮嬫帴鏀跺埌锲剧墖镄勬椂鍊欑粰涓涓猯oading澧炲姞鐢ㄦ埛镄勮愬绩濂戒简,loading涓囧瞾~

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镓浠,鑻ュ归暱搴︽病链夌壒娈婄殑闄愬埗,鍙浠ュ仛涓涓缂╂斁,铡诲姞蹇铡嬬缉镄勮繘搴,鎻愰珮鑳藉帇缂╃殑锲剧墖澶у皬涓婇檺銆

椤甸溃鍒颁简ios涓婅缮鏄涓嶈--,鍙浠ョ湅鍒版渶钖庡浘鐗噇evel涓0.001,链闀胯竟涓764銆

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澶у浘鐗囩殑绛夊緟镞堕棿绋嶉暱,鍙浠ョ粰鐢ㄦ埛鍏堥勮堜竴涓狰ase64镄勫浘鐗囧炲姞绛夊緟钥愬绩,鏂规硶钖崭负getImgBase64,杩欓噷閮戒竴骞剁粰鍑轰简

瑙e喅镄勯殣鎭:涓婇溃杩欎釜鏂规堜细鍑虹幇鎴戦渶瑕佷竴涓500k镄勭収鐗,铡嫔埌浜520k涔嫔悗,鍐嶅帇浜嗕竴娆°傛湁镞跺栾繖链钖庣殑涓娆′细鐗瑰埆澶稿紶,鐩存帴灏嗗浘鐗囧纰鍒颁简鍑犲崄k銆

鍙傝冧简:

杩欎釜搴挞噷闱㈡湁涓鏂规硶compressAccurately,杩欎釜鏂规硶鍙浠ユ瘆杈幂簿鍑嗗湴铡嬬缉銆傚伔锅风炕浜嗕竴涓嬫簮镰併

鍏跺疄涓娄竴涓鏂规堢殑䦅涚偣灏卞湪浜,濡备綍鍦ㄦ疮涓涓铡嬬缉寰鐜閲屽勭悊灏哄稿拰铡嬬缉姣斾緥銆

镐荤粨

濡傛湁绾版纺,娆㈣繋鎸囨

java濡备綍瀹炵幇鎶娄竴涓澶у浘鐗囧帇缂╁埌鎸囧畾澶у皬镄勫浘鐗囦笖闀垮芥瘆涓嶅彉锛

java瑕佸疄鐜版妸涓涓澶у浘鐗囧帇缂╁埌鎸囧畾澶у皬镄勫浘鐗囦笖闀垮芥瘆涓嶅彉鍙浠ュ皾璇曚互涓嬫搷浣:

寤虹珛涓涓狝ffineTransform

AffineTransform(doublem00,doublem10,doublem01,doublem11,doublem02,doublem12)

杞鎹㈢烦阒,缂╂斁姣旇缉绠鍗(鐭╅樀鍙浠ュ共寰埚氢簨𨱍,𨱍冲仛锲惧儚澶勭悊杞浠跺彲浠ョ爷绌朵笅)

[x'][m00m01m02][x][m00x+m01y+m02]

[y']=[m10m11m12][y]=[m10x+m11y+m12]

[1][001][1][1]

10鍊嶆瘆杈冮毦绠(镙瑰彿10鍟,褰撶劧浣犳兂绠椾篃琛),9鍊嶅ソ镣(9镄勫紑鏂规槸3),m00涓1/3,m01涓0,m02涓0,m10涓0,m11涓1/3,m12涓0銆

鍐嶅缓涓涓狝ffineTransformOp,鎶娄笂闱㈢殑杞鎹浼犺繘铡

AffineTransformOp(AffineTransformxform,intinterpolationType)

链钖庤皟鐢ˋffineTransformOp镄凚ufferedImagefilter(BufferedImagesrc,BufferedImagedst),src浼犲师锲剧墖,杩斿洖鍊煎氨鏄𨱍宠佺殑Image,娉ㄦ剰鏄杩斿洖鍊,涓嶆槸dst,涓嶆槑锏藉彲浠ョ湅涓婮avaAPI

java濡备綍瀹炵幇鎶娄竴涓澶у浘鐗囧帇缂╁埌鎸囧畾澶у皬镄勫浘鐗囦笖闀垮芥瘆涓嶅彉锛

java瑕佸疄鐜版妸涓涓澶у浘鐗囧帇缂╁埌鎸囧畾澶у皬镄勫浘鐗囦笖闀垮芥瘆涓嶅彉鍙浠ュ皾璇曚互涓嬫搷浣:

寤虹珛涓涓狝ffineTransform

AffineTransform(doublem00,doublem10,doublem01,doublem11,doublem02,doublem12)

杞鎹㈢烦阒,缂╂斁姣旇缉绠鍗(鐭╅樀鍙浠ュ共寰埚氢簨𨱍,𨱍冲仛锲惧儚澶勭悊杞浠跺彲浠ョ爷绌朵笅)

[x'][m00m01m02][x][m00x+m01y+m02]

[y']=[m10m11m12][y]=[m10x+m11y+m12]

[1][001][1][1]

10鍊嶆瘆杈冮毦绠(镙瑰彿10鍟,褰撶劧浣犳兂绠椾篃琛),9鍊嶅ソ镣(9镄勫紑鏂规槸3),m00涓1/3,m01涓0,m02涓0,m10涓0,m11涓1/3,m12涓0銆

鍐嶅缓涓涓狝ffineTransformOp,鎶娄笂闱㈢殑杞鎹浼犺繘铡

AffineTransformOp(AffineTransformxform,intinterpolationType)

链钖庤皟鐢ˋffineTransformOp镄凚ufferedImagefilter(BufferedImagesrc,BufferedImagedst),src浼犲师锲剧墖,杩斿洖鍊煎氨鏄𨱍宠佺殑Image,娉ㄦ剰鏄杩斿洖鍊,涓嶆槸dst,涓嶆槑锏藉彲浠ョ湅涓婮avaAPI

② JAVA怎么将pdf的base64转换成jpg的base64

package com.aiait.base.util;


import org.apache.pdfbox.pdmodel.PDDocument;

import org.apache.pdfbox.rendering.ImageType;

import org.apache.pdfbox.rendering.PDFRenderer;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;


import com.aiait.base.service.impl.base.SearchServiceImpl;


import org.apache.pdfbox.*;


import java.awt.image.BufferedImage;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

import java.text.DecimalFormat;

import java.util.Date;


import javax.imageio.ImageIO;


import org.apache.commons.lang3.StringUtils;


import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;


public class PDFUtil {

// logger

private static final Logger lOGGER = LoggerFactory.getLogger(PDFUtil.class);


public static void main(String[] args) {

// pdfTojpg("C://Test//eClaimPDF//1//Others.pdf","C://Test//eClaimPDF//WrittenConfirmation.jpg");

Date timeDiffE = null;

Date timeDiffL = null;

timeDiffE = new Date();

base64PdfToJpg(pdfBase64);

timeDiffL = new Date();

lOGGER.info("base64PdfToJpg use time: " + getDiffTime(timeDiffL, timeDiffE) + "s");

}

private static String base64PdfToJpg(String base64Pdf) {

String jpg_base64 = null;

int pdfdpi = 400;

BASE64Decoder decoder = new BASE64Decoder();

byte[] pdf_bytes = null;

try {

pdf_bytes = decoder.decodeBuffer(base64Pdf);

} catch (IOException e1) {

e1.printStackTrace();

}


try (final PDDocument document = PDDocument.load(pdf_bytes)) {

int size = document.getNumberOfPages();

/*图像合并使用参数*/

// 定义宽度

int width = 0;

// 保存一张图片中的RGB数据

int[] singleImgRGB;

// 定义高度,后面用于叠加

int shiftHeight = 0;

//保存每张图片的像素值

BufferedImage imageResult = null;

// 利用PdfBox生成图像

PDDocument pdDocument = document;

PDFRenderer renderer = new PDFRenderer(pdDocument);

/*根据总页数, 按照50页生成一张长图片的逻辑, 进行拆分*/

// 每50页转成1张图片

int pageLength = size; //有多少转多少

// 总计循环的次数

int totalCount = pdDocument.getNumberOfPages() / pageLength + 1;

for (int m = 0; m < totalCount; m++) {

for (int i = 0; i < pageLength; i++) {

int pageIndex = i + (m * pageLength);

if (pageIndex == pdDocument.getNumberOfPages()) {

System.out.println("m = " + m);

break;

}

// 96为图片的dpi,dpi越大,则图片越清晰,图片越大,转换耗费的时间也越多

BufferedImage image = renderer.renderImageWithDPI(pageIndex, 106, ImageType.RGB);

int imageHeight = image.getHeight();

int imageWidth = image.getWidth();

if (i == 0) {

//计算高度和偏移量

//使用第一张图片宽度;

width = imageWidth;

// 保存每页图片的像素值

// 加个判断:如果m次循环后所剩的图片总数小于pageLength,则图片高度按剩余的张数绘制,否则会出现长图片下面全是黑色的情况

if ((pdDocument.getNumberOfPages() - m * pageLength) < pageLength) {

imageResult = new BufferedImage(width, imageHeight * (pdDocument.getNumberOfPages() - m * pageLength), BufferedImage.TYPE_INT_RGB);

} else {

imageResult = new BufferedImage(width, imageHeight * pageLength, BufferedImage.TYPE_INT_RGB);

}

} else {

// 将高度不断累加

shiftHeight += imageHeight;

}

singleImgRGB = image.getRGB(0, 0, width, imageHeight, null, 0, width);

imageResult.setRGB(0, shiftHeight, width, imageHeight, singleImgRGB, 0, width);

}

// System.out.println("m = " + m);

File outFile = new File("C://Test//eClaimPDF//WrittenConfirmation.png");

System.out.println(outFile.getName());

// 写图片

ImageIO.write(imageResult, "png", outFile);

// 这个很重要,下面会有说明

shiftHeight = 0;

}

pdDocument.close();


ByteArrayOutputStream baos = new ByteArrayOutputStream();//io流

ImageIO.write(imageResult, "png", baos);//写入流中

byte[] jpg_Bytes = baos.toByteArray();//转换成字节

BASE64Encoder encoder = new BASE64Encoder();

jpg_base64 = encoder.encodeBuffer(jpg_Bytes).trim();//转换成base64串

jpg_base64 = jpg_base64.replaceAll(" ", "").replaceAll(" ", "");//删除

// System.out.println("值为:"+"data:image/jpg;base64,"+jpg_base64);

} catch (Exception e) {

e.printStackTrace();

}

return "data:image/jpg;base64,"+jpg_base64;

}

// private static String base64PdfToJpg(String base64Pdf) {

// String jpg_base64 = null;

// int pdfdpi = 400;

//

// BASE64Decoder decoder = new BASE64Decoder();

// byte[] pdf_bytes = null;

// try {

// pdf_bytes = decoder.decodeBuffer(base64Pdf);

// } catch (IOException e1) {

// e1.printStackTrace();

// }

//

// try (final PDDocument document = PDDocument.load(pdf_bytes)) {

// int size = document.getNumberOfPages();

// for (int i = 0; i < size; i++) {

// BufferedImage image = new PDFRenderer(document).renderImageWithDPI(i, pdfdpi, ImageType.RGB);

// BufferedImage image = new PDFRenderer(document).

//

// ByteArrayOutputStream baos = new ByteArrayOutputStream();//io流

// ImageIO.write(image, "jpg", baos);//写入流中

// byte[] jpg_Bytes = baos.toByteArray();//转换成字节

// BASE64Encoder encoder = new BASE64Encoder();

// jpg_base64 = encoder.encodeBuffer(jpg_Bytes).trim();//转换成base64串

// jpg_base64 = jpg_base64.replaceAll(" ", "").replaceAll(" ", "");//删除

//

// System.out.println("值为:"+"data:image/jpg;base64,"+jpg_base64);

//

// }

// } catch (Exception e) {

// e.printStackTrace();

// }

// return "data:image/jpg;base64,"+jpg_base64;

// }


private static void pdfTojpg(String pdfFilePath, String jpgFilePath) {

File pdfFile = new File(pdfFilePath);

int idx = jpgFilePath.lastIndexOf('.');

String jpgprefix = StringUtils.substring(jpgFilePath, 0, idx);

int pdfdpi = 400;

BASE64Decoder decoder = new BASE64Decoder();

byte[] bytes = null;

try {

bytes = decoder.decodeBuffer(pdfBase64);

} catch (IOException e1) {

e1.printStackTrace();

}


// try (final PDDocument document = PDDocument.load(pdfFile, "")) {

try (final PDDocument document = PDDocument.load(bytes)) {

int size = document.getNumberOfPages();

for (int i = 0; i < size; i++) {

BufferedImage image = new PDFRenderer(document).renderImageWithDPI(i, pdfdpi, ImageType.RGB);

/*

* ByteArrayOutputStream baos = new ByteArrayOutputStream();//io流

* ImageIO.write(image, "jpg", baos);//写入流中 byte[] imgBytes =

* baos.toByteArray();//转换成字节 BASE64Encoder encoder = new BASE64Encoder();

* String png_base64 = encoder.encodeBuffer(imgBytes).trim();//转换成base64串

* png_base64 = png_base64.replaceAll(" ", "").replaceAll(" ", "");//删除

*

* System.out.println("值为:"+"data:image/jpg;base64,"+png_base64);

*/

File jpgFile = new File(jpgprefix + "_" + i + ".jpg");

ImageIO.write(image, "jpg", jpgFile);

}

} catch (Exception e) {

e.printStackTrace();

}


}

private static Double getDiffTime(Date lateTime, Date earlyTime) {

DecimalFormat df=new DecimalFormat("0.00");//设置保留位数

return Double.valueOf(df.format((double)(lateTime.getTime() - earlyTime.getTime()) / 1000));

}


public static String pdfBase64 = "***" //from web网页链接, upload a PDF to get the base64 string (Base64 - Online Base64 decoder and encoder)

}

③ javapdf格式的base编码转换jpg格式的base64

在格式迟腊。
1、首先,将Java PDF格式的Base64编码启滑码字符串转换为byte数组。
2、然后,旁闭使用Java的ImageIO类将byte数组转换为BufferedImage对象。
3、接下来,将BufferedImage对象转换为JPG格式的Base64编码字符串。

④ java如何把图片转换成二进制并存到oracle的blob中,求代码

importjavax.imageio.ImageIO;
importjava.awt.image.BufferedImage;
importjava.io.ByteArrayInputStream;
importjava.io.ByteArrayOutputStream;
importjava.io.File;
importjava.io.IOException;


publicclassImageUtils{

publicstaticvoidmain(String[]args){
Stringstr=img2Binary("C:\Users\hny\Desktop\favicon.jpg");
System.out.println(str);
binary2Img("C:\Users\hny\Desktop\favicon2.jpg",str);
}

/**
*图片转二进制字符串
*
*@parampath图片路径
*@return
*/
publicstaticStringimg2Binary(Stringpath){
Filefile=newFile(path);
if(!file.exists()){
returnnull;
}

try{
BufferedImagebi=ImageIO.read(file);
ByteArrayOutputStreambaos=newByteArrayOutputStream();
Stringsuffix=getSuffix(path);
ImageIO.write(bi,suffix,baos);
byte[]bytes=baos.toByteArray();

returnnewsun.misc.BASE64Encoder().encodeBuffer(bytes).trim();
}catch(IOExceptione){
e.printStackTrace();
}
returnnull;
}

/**
*字符串转图片文件
*
*@parampath图片路径
*@paramimgBinary图片字符串
*/
publicstaticvoidbinary2Img(Stringpath,StringimgBinary){
try{
Filefile=newFile(path);

byte[]bytes1=newsun.misc.BASE64Decoder().decodeBuffer(imgBinary);
ByteArrayInputStreams=newByteArrayInputStream(bytes1);
BufferedImagebi1=ImageIO.read(s);
Stringsuffix=getSuffix(path);
ImageIO.write(bi1,suffix,file);
}catch(IOExceptione){
e.printStackTrace();
}
}

/**
*获取图片后缀名
*
*@parampath
*@return
*/
privatestaticStringgetSuffix(Stringpath){
intindex=path.contains(".")?path.lastIndexOf("."):-1;
if(index>-1){
returnpath.substring(index+1);
}
returnnull;
}
}

⑤ 将base64位转换成png图片的java代码

//base64字符串转化成图片
public static boolean GenerateImage(String imgStr)
{ //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[] b = decoder.decodeBuffer(imgStr);
for(int i=0;i<b.length;++i)
{
if(b[i]<0)
{//调整异常数据
b[i]+=256;
}
}
//生成jpeg图片
String imgFilePath = "d://222.jpg";//新生成的图片
OutputStream out = new FileOutputStream(imgFilePath);
out.write(b);
out.flush();
out.close();
return true;
}
catch (Exception e)
{
return false;
}
}
希望可以帮到你。

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