Base64 图片互相转画 url路径返回到前端

今天药忘吃喽~ 2022-11-21 14:51 159阅读 0赞

**1,在properties配置项目路径和端口**  
ip=127.0.0.1  
port=8081  
**2,在resource下创建temp文件夹**

**3，base64和图片互转工具类**\*\*\*\*

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;
        }
    
    }
    }

**4，配置类**

//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();
    }
    }

**5,测试**

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;
    }

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