Base64 图片 互相转画 url路径返回到前端

package com.njinst.fineweatherservice.util;

import org.apache.commons.lang.StringUtils;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

//java项目www.1b23.com
public class Base64Utils {
public static void main(String[] args) throws Exception {
//本地图片地址
    String url = "C:/Users/Administrator/Desktop/628947887489084892.jpg";
    //在线图片地址
    String string = "http://bpic.588ku.com//element_origin_min_pic/17/03/03/7bf4480888f35addcf2ce942701c728a.jpg";

    String str = Base64Utils.ImageToBase64ByLocal(url);

    String ste = Base64Utils.ImageToBase64ByOnline(string);

    System.out.println(str);

    Base64Utils.Base64ToImage(str, "C:/Users/Administrator/Desktop/test1.jpg");

    Base64Utils.Base64ToImage(ste, "C:/Users/Administrator/Desktop/test2.jpg");
}

/**
 * 本地图片转换成base64字符串
 *
 * @param imgFile 图片本地路径
 * @return
 * @author ZHANGJL
 * @dateTime 2018-02-23 14:40:46
 */
public static String ImageToBase64ByLocal(String imgFile) {// 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
    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();
        return null;
    }
    // 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
}


/**
 * 在线图片转换成base64字符串 //java项目www.1b23.com
 *
 * @param imgURL 图片线上路径
 * @return
 * @author ZHANGJL
 * @dateTime 2018-02-23 14:43:18
 */
public static String ImageToBase64ByOnline(String imgURL) {
    ByteArrayOutputStream data = new ByteArrayOutputStream();
    try {
        // 创建URL
        URL url = new URL(imgURL);
        byte[] by = new byte[1024];
        // 创建链接
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("GET");
        conn.setConnectTimeout(5000);
        InputStream is = conn.getInputStream();
        // 将内容读取内存中
        int len = -1;
        while ((len = is.read(by)) != -1) {
            data.write(by, 0, len);
        }
        // 关闭流
        is.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    // 对字节数组Base64编码
    BASE64Encoder encoder = new BASE64Encoder();
    return encoder.encode(data.toByteArray());
}


/**
 * base64字符串转换成图片 //java项目www.1b23.com
 *
 * @param imgStr      base64字符串
 * @param imgFilePath 图片存放路径
 * @return
 * @author ZHANGJL
 * @dateTime 2018-02-23 14:42:17
 */
public static boolean Base64ToImage(String imgStr, String imgFilePath) { // 对字节数组字符串进行Base64解码并生成图片

    if (StringUtils.isBlank(imgStr)) { // 图像数据为空
        return false;
    }
    BASE64Decoder decoder = new BASE64Decoder();
    try {
        //去掉前缀，否则图片查看不了
        String baseValue=imgStr.replaceAll(" ","+");
        // Base64解码,根据图片格式进行替换
        byte[] b = decoder.decodeBuffer(baseValue.replace("data:image/png:base64,",""));
        for (int i = 0; i < b.length; ++i) {
            if (b[i] < 0) {// 调整异常数据
                b[i] += 256;
            }
        }

        OutputStream out = new FileOutputStream(imgFilePath);
        out.write(b);
        out.flush();
        out.close();

        return true;
    } catch (Exception e) {
        return false;
    }

}
}

//java项目www.1b23.com
@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/").setViewName(“login”);
registry.addViewController("/index").setViewName(“login”);
registry.addViewController("/main").setViewName(“dashboard”);
}
/**
 *配置拦截器
 * @param registry
 */
@Override
public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(new LoginHandlerInterceptor()).addPathPatterns("/**")
    .excludePathPatterns("/index","/","/user/login","/asserts/**","/webjars/**");
}
// @Override
// public void addResourceHandlers(ResourceHandlerRegistry registry) {
String c=System.getProperties(“user.dir”);
String classpath="\src\main\resources\temp\";
// //静态资源的映射
registry.addResourceHandler("/temp/**")
.addResourceLocations(“file:+c=classpath”);
}
/**
 * 注意配置的方法的名字
 * @return
 */
@Bean
public MyLocaleResolver localeResolver() {
    return new MyLocaleResolver();
}
}

Public String void main(String [] args){
private static final String IP=PropertiesClassloder.getString(“ip”);
private static final String port=PropertiesClassloder.getString(“port”);
String base64=“data:image/png:base64,12333d”;//假数据
String c=System.getProperties(“user.dir”);
String classpath="\src\main\resources\temp\";
//使用时间戳作为图片名便于以后定时清理
String filName=new Date().getTime+".jpg";
String path=c+classpath+fileName;
Base64Utils.Base64ToImage(base64,path);
String url=“http://”+ip+port+"/temp/"+fileName;
return url;
}