用Java爬取网页图片——爬虫爬取数据

1、在创建项目中导入jsoup

2、创建一个保存下载图片的路径

3、使用URL读取网页路径，jsoup读取网页内容

4、利用属性标签获取图片连接块

5、因为该路径没有http：头，用StringBuilder增加

5、完善下载路径

## 点个关注、不迷路！！！

6、完整代码

public static void main(String[] args) throws IOException {

        File dir = new File("./src/main/java/img");
        if(dir.exists()){
            System.out.println("该目录已存在!");
        }else{
            dir.mkdirs();
            System.out.println("该目录已创建!");}

        String url ="https://www.nipic.com/topic/show_27202_1.html";
        Document document = Jsoup.parse(new URL(url), 100000);
        Element content = document.getElementById("img-list-outer");
//        Document document = Jsoup.connect(url).get();
        System.out.println(content);
        Elements imgs = content.getElementsByTag("img");//根据标签属性
        System.out.println(imgs);
        int id=0;
        for (Element img : imgs) {
            String imgSrc = img.attr("src");//根据属性查找
            StringBuilder builder = new StringBuilder("https:");
            System.out.println(imgSrc);
            id++;
            builder=builder.append(imgSrc);

            String str2 = builder.toString();
            System.out.println(str2);
            URL target = new URL(str2);
            URLConnection urlConnection = target.openConnection();
            InputStream is=urlConnection.getInputStream();
            OutputStream os=new FileOutputStream("./src/main/java/img/"+id+".jpg");

            int temp=0;
            while ((temp=is.read())!=-1){
                os.write(temp);
            }
            System.out.println(id+".jpg下载完毕！");
            os.close();
            is.close();
        }


    }