Java读取网页内容并下载图片的实例

Java读取网页内容并下载图片的实例

java读取网页内容并下载图片的实例

很多人在第一次了解数据采集的时候，可能无从下手，尤其是作为一个新手，更是感觉很是茫然，所以，在这里分享一下自己的心得，希望和大家一起分享技术，如果有什么不足，还请大家指正。写出这篇目的，就是希望大家一起成长，我也相信技术之间没有高低，只有互补，只有分享，才能使彼此更加成长。

示例代码：

import java.io.BufferedInputStream;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.MalformedURLException;

import java.net.URL;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class GetContentPicture {

public void getHtmlPicture(String httpUrl) {

URL url;

BufferedInputStream in;

FileOutputStream file;

try {

System.out.println("取网络图片");

String fileName = httpUrl.substring(httpUrl.lastIndexOf("/"));

String filePath = "./pic/";

url = new URL(httpUrl);

in = new BufferedInputStream(url.openStream());

file = new FileOutputStream(new File(filePath+fileName));

int t;

while ((t = in.read()) != -1) {

file.write(t);

}

file.close();

in.close();

System.out.println("图片获取成功");

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

public String getHtmlCode(String httpUrl) throws IOException {

String content ="";

URL uu = new URL(httpUrl); // 创建URL类对象

BufferedReader ii = new BufferedReader(new InputStreamReader(uu

.openStream())); // //使用openStream得到一输入流并由此构造一个BufferedReader对象

String input;

while ((input = ii.readLine()) != null) { // 建立读取循环，并判断是否有读取值

content += input;

}

ii.close();

return content;

}

public void get(String url) throws IOException {

String searchImgReg nUExT= "(?x)(src|SRC|background|BACKGROUND)=('|\")/?(([\\w-]+/)*([\\w-]+\\.(jpg|JPG|png|PNG|gif|GIF)))('|\")";

String searchImgReg2 = "(?x)(src|SRC|background|BACKGROUND)=('|\")(http://([\\w-]+\\.)+[\\w-]+(:[0-9]+)*(/[\\w-]+)*(/[\\w-]+\\.(jpg|JPG|png|PNG|gif|GIF)))('|\")";

String content = this.getHtmlCode(url);

System.out.println(content);

Pattern pattern = Pattern.compile(searchImgReg);

Matcher matcher = pattern.matcher(content);

while (matcher.find()) {

System.out.println(matcher.group(3));

this.getHtmlPicture(url+matcher.group(3));

}

pattern = Pattern.compile(searchImgReg2);

matcher = pattern.matcher(content);

while (matcher.find()) {

System.out.println(matcher.group(3));

this.getHtmlPicture(matcher.group(3));

}

// searchImgReg =

// "(?x)(src|SRC|background|BACKGROUND)=('|\")/?(([\\w-]+/)*([\\w-]+\\.(jpg|JPG|png|PNG|gif|GIF)))('|\")";

}

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

String url = "http://baidu.com/";

GetContentPicture gcp = new GetContentPicture();

gcp.get(url);

}

}

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