new url()java
时间: 2023-07-28 12:11:13 浏览: 40
`java.net.URL` 是 Java 中用于表示统一资源定位符(URL)的类。可以使用它来创建、解析、操作 URL。以下是创建 URL 对象的示例:
```java
import java.net.*;
public class Example {
public static void main(String[] args) throws MalformedURLException {
URL url = new URL("https://www.example.com/");
System.out.println("Protocol: " + url.getProtocol());
System.out.println("Host: " + url.getHost());
System.out.println("Port: " + url.getPort());
System.out.println("Path: " + url.getPath());
System.out.println("Query: " + url.getQuery());
}
}
```
输出:
```
Protocol: https
Host: www.example.com
Port: -1
Path: /
Query: null
```
相关问题
java url 转 pdf
要将Java中的URL转换为PDF,可以使用iText库。首先,您需要使用Java的URL类来打开并读取URL中的内容。然后,您可以使用iText库中的PdfWriter类将URL内容写入PDF文件中。以下是一个简单的示例代码:
```java
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;
import com.itextpdf.text.Document;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;
public class URLtoPDFConverter {
public static void main(String[] args) {
try {
// 创建一个Document对象
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream("output.pdf"));
document.open();
// 读取URL内容并添加到PDF文档中
URL url = new URL("http://www.example.com/content");
InputStream is = url.openStream();
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = is.read(buffer)) != -1) {
document.add(new Paragraph(new String(buffer, 0, bytesRead)));
}
document.close();
is.close();
System.out.println("PDF文件已生成");
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
在这个示例中,我们首先创建一个Document对象,然后使用PdfWriter将其实例化,并指定输出的PDF文件名。接着,我们使用URL类打开和读取指定URL的内容,并将其添加到PDF文档中。最后,我们关闭文档并打印出一个成功的消息。
使用iText库能够很方便地实现将Java中的URL转换为PDF文件,同时也能够对生成的PDF文件进行更多的定制和处理。希望对您有所帮助!
java url get
To perform a HTTP GET request in Java, you can use the HttpURLConnection class. Here is an example:
```
import java.net.HttpURLConnection;
import java.net.URL;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class HttpGetExample {
public static void main(String[] args) {
try {
URL url = new URL("http://example.com");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/json");
if (conn.getResponseCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode());
}
BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
System.out.println(output);
}
conn.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
In this example, we are performing a GET request to "http://example.com" and setting the "Accept" header to "application/json". We then check the response code to make sure it is 200 (OK), and print out the response from the server. Finally, we disconnect the HttpURLConnection.
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