将base64String转化为图片

将图片转成base64码，或者将base64码转成图片。

package com.test.controller;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.zichan360.auth_center.util.CustomStringUtil;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.*;
import java.util.Date;

/**
 * Created by Administrator on 2018/4/10.
 */
@RestController
@RequestMapping("/Base64")
public class Base64Controller {

    @RequestMapping("getBase64PicUrl")
    public JSONObject getBase64PicUrl(@RequestBody JSONObject josn){
        JSONObject result = new JSONObject();
        StringBuffer base64String =  new StringBuffer(josn.getString("base64String"));
        boolean test = test(base64String);
        result.put("success",test);
        result.put("message","");
        return result;
    }

    //图片转化成base64字符串
    public static String GetImageStr()
    {//将图片文件转化为字节数组字符串，并对其进行Base64编码处理
        String imgFile = "D:/test/base64/qqq.jpg";//待处理的图片
        InputStream in = null;
        byte[] data = null;
        //读取图片字节数组
        try
        {
            in = new FileInputStream(imgFile);
            data = new byte[in.available()];
            in.read(data);
            in.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        //对字节数组Base64编码
        BASE64Encoder encoder = new BASE64Encoder();
        return encoder.encode(data);//返回Base64编码过的字节数组字符串
    }

    //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:/test/base64/new.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;
        }
    }


    public static boolean  test(StringBuffer json) {
        System.out.println("D:/test");

        String imageName = null;
        try {
            imageName = CustomStringUtil.getExtension();
//      String imageName="";
            //图片存储路径
            String imagePath = "D:/test/base64/" + imageName + ".png" ;
            StringBuffer imageBase64 = new StringBuffer();
            String imageType="png";
            //将字符串转化成图片
            boolean isSuccess = CustomStringUtil.base64StringToImage(json, imagePath,imageType);
            System.out.println(isSuccess);
            return isSuccess;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return  false;
    }
    public static void main(String[] args) {
        test("你的base64字符码");
        String strImg = GetImageStr();
        System.out.println(strImg);
        GenerateImage(strImg);
    }

}