java下载网页内容和网络图片

最新推荐文章于 2025-06-29 11:45:48 发布

eric_za

最新推荐文章于 2025-06-29 11:45:48 发布

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分类专栏： JAVA 文章标签： java

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本文介绍了一个使用Java实现的网络资源下载及内容解析的方法。该方法能够从指定URL下载文件并保存到本地，同时还能读取网页内容并进行字符串形式的输出。涉及的技术包括HTTP请求、文件操作等。

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import java.io.BufferedReader;  
import java.io.ByteArrayOutputStream;  
import java.io.File;  
import java.io.FileOutputStream;  
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.net.HttpURLConnection;  
import java.net.URL;  
  
public class UrlResource {  
  
    public static void main(String[] args){  
        try {  
            System.out.println(UrlResource.getUrlDetail("http://www.baidu.com",true));  
            saveUrlFile("http://www.baidu.com/img/baidu_jgylogo3.gif", "D:\\1.gif");  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
      
    //获取网络文件，转存到fileDes中，fileDes需要带文件后缀名  
    public static void saveUrlFile(String fileUrl,String fileDes) throws Exception  
    {  
        File toFile = new File(fileDes);  
        if (toFile.exists())  
        {  
//          throw new Exception("file exist");  
            return;  
        }  
        toFile.createNewFile();  
        FileOutputStream outImgStream = new FileOutputStream(toFile);  
        outImgStream.write(getUrlFileData(fileUrl));  
        outImgStream.close();  
    }  
      
    //获取链接地址文件的byte数据  
    public static byte[] getUrlFileData(String fileUrl) throws Exception  
    {  
        URL url = new URL(fileUrl);  
        HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();  
        httpConn.connect();  
        InputStream cin = httpConn.getInputStream();  
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();  
        byte[] buffer = new byte[1024];  
        int len = 0;  
        while ((len = cin.read(buffer)) != -1) {  
            outStream.write(buffer, 0, len);  
        }  
        cin.close();  
        byte[] fileData = outStream.toByteArray();  
        outStream.close();  
        return fileData;  
    }  
      
    //获取链接地址的字符数据，wichSep是否换行标记  
    public static String getUrlDetail(String urlStr,boolean withSep) throws Exception  
    {  
        URL url = new URL(urlStr);  
        HttpURLConnection httpConn = (HttpURLConnection)url.openConnection();  
        httpConn.connect();  
        InputStream cin = httpConn.getInputStream();  
        BufferedReader reader = new BufferedReader(new InputStreamReader(cin,"UTF-8"));  
        StringBuffer sb = new StringBuffer();  
        String rl = null;  
        while((rl = reader.readLine()) != null)  
        {  
            if (withSep)  
            {  
                sb.append(rl).append(System.getProperty("line.separator"));  
            }  
            else  
            {  
                sb.append(rl);  
            }  
        }  
        return sb.toString();  
    }  
      
}