java - 如何在java中获取url html内容到字符串

Question

我在服务器上存储了一个 html 文件。我有这样的 URL 路径：<https://localhost:9443/genesis/Receipt/Receipt.html >

我想从 url 中读取包含标签的 html 文件的内容，即 html 文件的源代码。

我该怎么做？这是一个服务器端代码，不能有浏览器对象，我不确定使用 URLConnection 是否是一个不错的选择。

现在最好的解决方案应该是什么？

Answer 1

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
 
public class URLContent {
    public static void main(String[] args) {
        try {
            // get URL content
            
            String a = "http://localhost:8080//TestWeb/index.jsp";
            URL url = new URL(a);
            URLConnection conn = url.openConnection();
 
            // open the stream and put it into BufferedReader
            BufferedReader br = new BufferedReader(
                               new InputStreamReader(conn.getInputStream()));
 
            String inputLine;
            while ((inputLine = br.readLine()) != null) {
                System.out.println(inputLine);
            }
            br.close();
 
            System.out.println("Done");

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Answer 2

使用spring解决了它，将bean添加到spring配置文件中

  <bean id = "receiptTemplate" class="org.springframework.core.io.ClassPathResource">
    <constructor-arg value="/WEB-INF/Receipt/Receipt.html"></constructor-arg>
  </bean>

然后用我的方法阅读

        // read the file into a resource
        ClassPathResource fileResource =
            (ClassPathResource)context.getApplicationContext().getBean("receiptTemplate");
        BufferedReader br = new BufferedReader(new FileReader(fileResource.getFile()));
        String line;
        StringBuffer sb =
            new StringBuffer();

        // read contents line by line and store in the string
        while ((line =
            br.readLine()) != null) {
            sb.append(line);
        }
        br.close();
        return sb.toString();

Answer 3

举个例子 ：

        URL url = new URL("https://localhost:9443/genesis/Receipt/Receipt.html");
        URLConnection con = url.openConnection();
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String l;
        while ((l=in.readLine())!=null) {
            System.out.println(l);
        }

您可以以其他方式使用输入流，而不仅仅是打印它。

当然如果你有本地文件的路径，你也可以这样做

  InputStream in = new FileInputStream(new File(yourPath));

Answer 4

import java.net.*;
import java.io.*;

//...

URL url = new URL("https://localhost:9443/genesis/Receipt/Receipt.html");
url.openConnection();
InputStream reader = url.openStream();

Answer 5

我认为最简单的方法是使用IOUtils

import com.amazonaws.util.IOUtils;
...

String uri = "https://localhost:9443/genesis/Receipt/Receipt.html";
String fileContents = IOUtils.toString(new URL(uri).openStream());
System.out.println(fileContents);