Java - 图片序列化

1.将本地的图片转成byte数组，base64序列化，转成byte数组，保存为jpeg

package p01;import java.io.ByteArrayOutputStream;import java.io.File;import java.util.ArrayList;import java.util.List;import java.util.UUID;import javax.imageio.stream.FileImageInputStream;import javax.imageio.stream.FileImageOutputStream;import com.fasterxml.jackson.databind.ObjectMapper;/* * 1. 图片转为byte数组，byte数组转为，base64 String * 2. String 转回 byte数组，在本地保存为图片 * 3. 将java 对象转化为json 数据 */public class ImgToString {public static void main(String []args) throws Exception {// 文件名的listList list = new ArrayList();// 先从本地读取图片，转成StringString strF1 = "f:\\115图片20170210174749.png";list.add(strF1);File f1 = new File("");String uuid = (UUID.randomUUID().toString()).replaceAll("-", "");String strF2 = "f:\\img\\desk\\" + uuid + ".JPEG";list.add(strF2);File f2 = new File(strF2);File dir = new File("f:\\img\\desk\\");// 创建文件夹dir.mkdirs();Util util = new Util();// 将list转为jsonObjectMapper mapper = new ObjectMapper();String json = mapper.writeValueAsString(list);System.out.println(json);if (f1.exists()) {byte []data = null;FileImageInputStream input = new FileImageInputStream(f1);ByteArrayOutputStream output = new ByteArrayOutputStream();byte []buf = new byte[1024];int numBytesRead = 0;// 返回读取多少个bytewhile ((numBytesRead = input.read(buf)) != -1) {output.write(buf, 0, numBytesRead);}data = output.toByteArray();String strImg = util.encodeBase64(data);//System.out.println(strImg);System.out.println("正在转码");input.close();output.close();// 返序列化// 将字符串转化为图片byte []dataImg = util.decodeBase64(strImg);FileImageOutputStream fios = new FileImageOutputStream(f2);fios.write(dataImg, 0, dataImg.length);fios.close();System.out.println("ok");} else {System.out.println("null");}System.out.println("end");}}

2.

接受base64 的string，保存在本地，返回json格式的图片路径

package com.yuejianmian.util;import java.io.File;import java.lang.reflect.Method;import java.util.UUID;import javax.imageio.stream.FileImageOutputStream;import com.fasterxml.jackson.databind.ObjectMapper;public class StringUtil {public String saveImgLocal(String basePath, String imgStr) throws Exception {// 创建文件夹File dir = new File(basePath);// 判断是否存在，不存在创建if (!dir.exists()) {dir.mkdirs();}// uuidString uuid = (UUID.randomUUID().toString()).replaceAll("-", "");String imgPath = basePath + uuid + ".JPEG";// 创建图片流FileImageOutputStream fios = null;// 将String 转成byte数组byte []dataImg = decodeBase64(imgStr);// 写入本地File img = new File(imgPath);fios = new FileImageOutputStream(img);fios.write(dataImg, 0, dataImg.length);fios.close();return imgPath;}// jackson插件，将一个对象转成一个json字符串public String objToJSONString(Object obj) throws Exception {ObjectMapper mapper = new ObjectMapper();return mapper.writeValueAsString(obj);} /***      * encode by Base64      */  private  byte[] decodeBase64(String input) throws Exception{          Class clazz=Class.forName("com.sun.org.apache.xerces.internal.impl.dv.util.Base64");          Method mainMethod= clazz.getMethod("decode", String.class);          mainMethod.setAccessible(true);           Object retObj=mainMethod.invoke(null, input);           return (byte[])retObj;      } }

 /***      * decode by Base64      * 将字符串转化为图片，序列化     */      @SuppressWarnings({ "unchecked", "rawtypes" })public static byte[] decodeBase64(String input) throws Exception{          Class clazz=Class.forName("com.sun.org.apache.xerces.internal.impl.dv.util.Base64");          Method mainMethod= clazz.getMethod("decode", String.class);          mainMethod.setAccessible(true);           Object retObj=mainMethod.invoke(null, input);           return (byte[])retObj;      }