[iOS基础控件 - 6.9.4] 抓取网页图片资源

2023-08-20 11:49:22

A.需求

1.利用浏览器取得网页的源码

2.解析源码，获取图片地址（这里使用了java的一个库来解析html）

3.获取资源，生成plist目录

B.实现步骤

1.打开一个网页，最好里面是包含了静态布局图片内容的

最好不要使用safari，不方便提取源码，这里我使用火狐

2.这里就要提取所有“力量英雄”的图片，并且附带英雄名

对着一张图片右击，选择“查看元素”

3.找到所需要提取的区域的html源码，复制

4.使用eclipse新建项目，创建一个html文件并黏贴源码，补全html格式

5.引入用来解析网页的jsoup jar包

6.使用java解析html源码，提取图片地址和相关信息

使用java代码生成一个OC数组，包含了上述信息，给OC项目使用

 import java.io.File;

 import org.jsoup.Jsoup;

 import org.jsoup.nodes.Document;

 import org.jsoup.nodes.Element;

 import org.jsoup.select.Elements;

 public class FetchDataUtil {

 public static void main(String[] args) {

 // TODO Auto-generated method stub

 // 指定html文件地址

 String path = "/Users/hellovoidworld/Study/java/EclipseWrokspace/Test/FetchDataFromHtml/src/pic.html";

 try {

 // 1.读取html文件

 Document doc = Jsoup.parse(new File(path), "gb2312");

 // 2.解析出包含了图片和信息的li元素

 Elements lis = doc.select("li");

 // 创建OC数组格式的字符串

 System.out.println("@[");

 // 3.遍历所有li元素，提取内容

 for (Element li : lis) {

 // 3.1 提取图片元素

 Element img = li.select("img").get(0);

 // 3.2 提取图片路径

 String imgUrl = img.attr("src");

 // 3.3 提取英雄名

 Element p = li.select("p").get(0);

 String heroName = p.text();

 // 4.拼接OC数组

 System.out.println("@{@\"heroName\":@\"" + heroName + "\",@\"imgUrl\":@\"" + imgUrl + "\"},");

 }

 System.out.println("];");

 }

 catch (Exception e)

 {

 e.printStackTrace();

 } finally {

 }

 }

 }

输出：

手动修改一下不符合格式的部分

  NSArray *imgs = @[

       @{@"heroName":@"斧王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/FW.gif"},

       @{@"heroName":@"钢背兽",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/H008.jpg"},

       @{@"heroName":@"兽王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/swsw.jpg"},

       @{@"heroName":@"发条",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/FTDJ.gif"},

       @{@"heroName":@"混沌骑士",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/hdqs.gif"},

       @{@"heroName":@"船长",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/CZCZ.jpg"},

       @{@"heroName":@"人马",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/brmm.jpg"},

       @{@"heroName":@"龙骑士",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/Hlgr.gif"},

       @{@"heroName":@"末日守卫",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/mrsz.gif"},

       @{@"heroName":@"撼地神牛",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/hdsn.jpg"},

       @{@"heroName":@"凤凰",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/hzfh.gif"},

       @{@"heroName":@"炼金",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/N01H.jpg"},

       @{@"heroName":@"神灵",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/H00Q.gif"},

       @{@"heroName":@"海牙",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/jyhm.jpg"},

       @{@"heroName":@"地狱领主",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/DXLZ.gif"},

       @{@"heroName":@"狼人",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/Bane.gif"},

       @{@"heroName":@"猛犸",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/UC11.gif"},

       @{@"heroName":@"食尸鬼",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/Naix.gif"},

       @{@"heroName":@"夜魔",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/AYMW.gif"},

       @{@"heroName":@"全能骑士",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/qnqs.gif"},

       @{@"heroName":@"熊猫酒仙",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/xmjx.gif"},

       @{@"heroName":@"深渊魔王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/SYLZ.gif"},

       @{@"heroName":@"裂魂人",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/O00J.jpg"},

       @{@"heroName":@"鱼人守卫",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/XESW.gif"},

       @{@"heroName":@"沙王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/U00K.gif"},

       @{@"heroName":@"骷髅王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/klw.gif"},

       @{@"heroName":@"流浪剑客",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/lljk.jpg"},

       @{@"heroName":@"牛头人",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/ntrr.jpg"},

       @{@"heroName":@"屠夫",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/U00F.gif"},

       @{@"heroName":@"潮汐",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/Ofar.gif"},

       @{@"heroName":@"山岭",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/sljr.jpg"},

       @{@"heroName":@"树精",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/sjws.gif"},

       @{@"heroName":@"尸王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/BXSW.gif"},

       @{@"heroName":@"精灵守卫",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/jlsw.jpg"}

       ];

7.复制数组源码到OC项目，输出图片到文件

 - (void) fetchImage{

     NSArray *imgs = @[

       @{@"heroName":@"斧王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/FW.gif"},

       @{@"heroName":@"钢背兽",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/H008.jpg"},

       @{@"heroName":@"兽王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/swsw.jpg"},

       @{@"heroName":@"发条",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/FTDJ.gif"},

       @{@"heroName":@"混沌骑士",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/hdqs.gif"},

       @{@"heroName":@"船长",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/CZCZ.jpg"},

       @{@"heroName":@"人马",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/brmm.jpg"},

       @{@"heroName":@"龙骑士",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/Hlgr.gif"},

       @{@"heroName":@"末日守卫",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/mrsz.gif"},

       @{@"heroName":@"撼地神牛",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/hdsn.jpg"},

       @{@"heroName":@"凤凰",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/hzfh.gif"},

       @{@"heroName":@"炼金",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/N01H.jpg"},

       @{@"heroName":@"神灵",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/H00Q.gif"},

       @{@"heroName":@"海牙",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/jyhm.jpg"},

       @{@"heroName":@"地狱领主",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/DXLZ.gif"},

       @{@"heroName":@"狼人",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/Bane.gif"},

       @{@"heroName":@"猛犸",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/UC11.gif"},

       @{@"heroName":@"食尸鬼",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/Naix.gif"},

       @{@"heroName":@"夜魔",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/AYMW.gif"},

       @{@"heroName":@"全能骑士",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/qnqs.gif"},

       @{@"heroName":@"熊猫酒仙",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/xmjx.gif"},

       @{@"heroName":@"深渊魔王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/SYLZ.gif"},

       @{@"heroName":@"裂魂人",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/O00J.jpg"},

       @{@"heroName":@"鱼人守卫",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/XESW.gif"},

       @{@"heroName":@"沙王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/U00K.gif"},

       @{@"heroName":@"骷髅王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/klw.gif"},

       @{@"heroName":@"流浪剑客",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/lljk.jpg"},

       @{@"heroName":@"牛头人",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/ntrr.jpg"},

       @{@"heroName":@"屠夫",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/U00F.gif"},

       @{@"heroName":@"潮汐",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/Ofar.gif"},

       @{@"heroName":@"山岭",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/sljr.jpg"},

       @{@"heroName":@"树精",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/sjws.gif"},

       @{@"heroName":@"尸王",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/BXSW.gif"},

       @{@"heroName":@"精灵守卫",@"imgUrl":@"http://dotadb.uuu9.com/UploadFiles/Dota/Hero/jlsw.jpg"}

       ];

     for (NSDictionary *dict in imgs) {

         // 1.图片URL

         NSString *imgUrl = dict[@"imgUrl"];

         // 2.图片数据

         NSData *imgData = [NSData dataWithContentsOfURL:[NSURL URLWithString:imgUrl]];

         // 3.截取图片名

         NSString *imgName = [imgUrl lastPathComponent]; // 最后的路径名

         // 4.存放路径

         NSString *imgSavedPath = [NSString stringWithFormat:@"/Users/hellovoidworld/Study/iOS/0403/FetchImage/FetchImage/heroImg/%@", imgName];

         // 5.保存图片

         [imgData writeToFile:imgSavedPath atomically:YES];

     }

 }

8.生成plist文件

  // 保存信息到plist文件

     NSMutableArray *heroData = [NSMutableArray array];

     for (NSDictionary *dict in imgs) {

         // 1.英雄名

         NSString *heroName = dict[@"heroName"];

         // 2.图片URL

         NSString *imgUrl = dict[@"imgUrl"];

         // 3.截取图片名

         NSString *imgName = [imgUrl lastPathComponent]; // 最后的路径名

         NSDictionary *hero = @{@"heroName":heroName, @"img":imgName};

         [heroData addObject:hero];

     }

     [heroData writeToFile:@"/Users/hellovoidworld/Study/iOS/0403/FetchImage/FetchImage/hero.plist" atomically:YES];

out:

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