使用知识：
文件流
新建文件，新建文件夹
模拟浏览器请求

package 文件操作;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class Pic696 {
`public static void main(String[] args) {
for(int i =1;i<72;i++) {
    for (int j =1; j < 50; j++) {

        if(i<10&&j<10) {
            String strUrl ="https://mmslt1.com/tp/girl/FEILIN/A-00"+i+"/0"+j+".jpg";
`
//                System.out.println(i+" "+j);
System.out.println(strUrl);
URL url;
try {
url = new URL(strUrl);
try {
Pig(url, i, j);
} catch (IOException e) {
System.out.println("404");
}
} catch (MalformedURLException e) {
`            }
            
        }
        if(i<10&&j>=10) {
            String strUrl ="https://mmslt1.com/tp/girl/FEILIN/A-00"+i+"/"+j+".jpg";
`
//                System.out.println(i+" "+j);
System.out.println(strUrl);
URL url;
try {
url = new URL(strUrl);
try {
Pig(url, i, j);
} catch (IOException e) {
System.out.println("404");
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
`        }
        if(i>=10&&j<10) {
            String strUrl ="https://mmslt1.com/tp/girl/FEILIN/A-0"+i+"/0"+j+".jpg";
`
//                System.out.println(i+" "+j);
System.out.println(strUrl);
URL url;
try {
url = new URL(strUrl);
try {
Pig(url, i, j);
} catch (IOException e) {
System.out.println("404");
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
`        }
        if(i>=10&&j>=10) {
        String strUrl ="https://mmslt1.com/tp/girl/FEILIN/A-0"+i+"/"+j+".jpg";
`
//            System.out.println(i+" "+j);
System.out.println(strUrl);
URL url;
try {
url = new URL(strUrl);
try {
Pig(url, i, j);
} catch (IOException e) {
System.out.println("404");
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
`        }
    }
}
`
}
`static void Pig(URL urlStr,int i,int j) throws IOException {
    //构造连接
    HttpURLConnection conn = (HttpURLConnection)urlStr.openConnection();
    conn.setRequestMethod("GET");
    //这个网站要模拟浏览器才行
    conn.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0");
    //打开连接
    conn.connect();

    //打开这个网站的输入流
    InputStream inStream = conn.getInputStream();
    //用这个做中转站 ，把图片数据都放在了这里，再调用toByteArray()即可获得数据的byte数组
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    //用这个是很好的，不用一次就把图片读到了文件中
    //要是需要把图片用作其他用途呢？所以直接把图片的数据弄成一个变量，十分有用
    //相当于操作这个变量就能操作图片了

    byte [] buf = new byte[1024];
    //为什么是1024？
    //1024Byte=1KB，分配1KB的缓存
    
    int len = 0;

    //读取图片数据
    while((len=inStream.read(buf))!=-1){
`
//        System.out.println(len);
outStream.write(buf,0,len);
}
inStream.close();
outStream.close();
`    //把图片数据填入文件中
`
//        File files = new File("E://Pic696");
//        files.mkdirs();
File file = new File("E://Pic696/Pic"+i+"_"+j+".jpg");
`    FileOutputStream op = new FileOutputStream(file);

    op.write(outStream.toByteArray());

    op.close();
 }    
`
}