「java中的url」Java中的url
本篇文章给大家谈谈java中的url，以及Java中的url对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。
本文目录一览：
java中如何实现URL类?
import java.io.*;
import java.net.*;
public class URLTest
{
public static void main(String[] args)
{
try
{
URL url=new URL("");//创建资源类型
String protocol=url.getProtocol();//获取资源类型
String host=url.getHost();//获取域名
int port=url.getPort();//获取端口
String file=url.getFile();//获取路径
System.out.println("url地址的资源类型为："+protocol+"域名为："+host+"端口为:"+port+"路径为:"+file);
InputStream is=url.openStream();//获取页面信息流
BufferedReader bfr=new BufferedReader(new InputStreamReader(is));//封装成字符流
String len;
while((len=bfr.readLine())!=null)
{
System.out.println(len);
}
bfr.close();
is.close();
}
catch(MalformedURLException e)
{
System.out.println("创建URL对象发生异常");
}
catch(IOException e)
{
System.out.println("发生IO操作异常");
}
}
}
用java怎么写URL接口
在java中，调用http请求接口，主要通过流的方式进行调用，示例接口如下：
/**
* 程序中访问http数据接口
*/
public String searchLoginService(String urlStr) {
/** 网络的url地址 */
URL url = null;
/** http连接 */
HttpURLConnection httpConn = null;
/**//** 输入流 */
BufferedReader in = null;
StringBuffer sb = new StringBuffer();
try{
url = new URL(urlStr);
in = new BufferedReader( new InputStreamReader(url.openStream(),"UTF-8") );
String str = null;
while((str = in.readLine()) != null) {
sb.append( str );
}
} catch (Exception ex) {
logger.error(ex.getMessage(), ex);
} finally{
try{
if(in!=null) {
in.close();
}
}catch(IOException ex) {
logger.error(ex.getMessage(), ex);
}
}
String result =sb.toString();
System.out.println(result);
return result;
}
如何使用java调用url接口
原贴地址
一、在java中调用url，并打开一个新的窗口
Java代码
String url="";
String cmd = "cmd.exe /c start " + url;
try {
Process proc = Runtime.getRuntime().exec(cmd);
proc.waitFor();
}
catch (Exception e)
{
e.printStackTrace();
}
二、在java中调用url，后台调用。并取得返回值
Java代码
URL U = new URL("");
URLConnection connection = U.openConnection();
connection.connect();
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
while ((line = in.readLine())!= null)
{
result += line;
}
in.close();
java获取URL
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class GetLinks {
private String webSource;
private String url;
public GetLinks(String url) throws MalformedURLException, IOException {
this.url = Complete(url);
webSource = getWebCon(this.url);
}
private String getWebCon(String strURL) throws MalformedURLException,
IOException {
StringBuffer sb = new StringBuffer();
java.net.URL url = new java.net.URL(strURL);
BufferedReader in = new BufferedReader(new InputStreamReader(url
.openStream()));
String line;
while ((line = in.readLine()) != null) {
sb.append(line);
}
in.close();
return sb.toString();
}
private String Complete(String link)throws MalformedURLException{
URL url1 = new URL(link);
URL url2 = new URL(link+"/");
String handledUrl = link;
try{
StringBuffer sb1 = new StringBuffer();
BufferedReader in1 = new BufferedReader(new InputStreamReader(url1
.openStream()));
String line1;
while ((line1 = in1.readLine()) != null) {
sb1.append(line1);
}
in1.close();
StringBuffer sb2 = new StringBuffer();
BufferedReader in2 = new BufferedReader(new InputStreamReader(url2
.openStream()));
String line2;
while ((line2 = in2.readLine()) != null) {
sb2.append(line2);
}
in1.close();
if(sb1.toString().equals(sb2.toString())){
handledUrl = link+"/";
}
}catch(Exception e){
handledUrl = link;
}
return handledUrl;
}
/**
* 处理链接的相对路径
* @param link 相对路径或绝对路径
* @return 绝对路径
*/
private String urlHandler(String link) {
if (link == null)
return null;
link = link.trim();
if (link.toLowerCase().startsWith("http://")
|| link.toLowerCase().startsWith("https://")) {
return link;
}
String pare = url.trim();
if (!link.startsWith("/")) {
if (pare.endsWith("/")) {
return pare + link;
}
if (url.lastIndexOf("/") == url.indexOf("//") + 1 || url.lastIndexOf("/") == url.indexOf("//") + 2) {
return pare + "/" + link;
} else {
int lastSeparatorIndex = url.lastIndexOf("/");
return url.substring(0, lastSeparatorIndex + 1) + link;
}
}else{
if (url.lastIndexOf("/") == url.indexOf("//") + 1 || url.lastIndexOf("/") == url.indexOf("//") + 2) {
return pare + link;
}else{
return url.substring(0,url.indexOf("/", url.indexOf("//")+3)) + link;
}
}
}
public ListString getAnchorTagUrls() {
if (webSource == null) {
System.out.println("没有网页源代码");
return null;
}
ArrayListString list = new ArrayListString();
int index = 0;
while (index != -1) {
index = webSource.toLowerCase().indexOf("a ", index);
if (index != -1) {
int end = webSource.indexOf("", index);
String str = webSource.substring(index, end == -1 ? webSource
.length() : end);
str = str.replaceAll("\\s*=\\s*", "=");
if (str.toLowerCase().matches("^a.*href\\s*=\\s*[\'|\"]?.*")) {// "^a\\s+\\w*\\s*href\\s*=\\s*[\'|\"]?.*"
int hrefIndex = str.toLowerCase().indexOf("href=");
int leadingQuotesIndex = -1;
if ((leadingQuotesIndex = str.indexOf("\"", hrefIndex
+ "href=".length())) != -1) { // 形如a
// href="....."
int TrailingQuotesIndex = str.indexOf("\"",
leadingQuotesIndex + 1);
TrailingQuotesIndex = TrailingQuotesIndex == -1 ? str
.length() : TrailingQuotesIndex;
str = str.substring(leadingQuotesIndex + 1,
TrailingQuotesIndex);
str = urlHandler(str);
list.add(str);
System.out.println(str);
index += "a ".length();
continue;
}
if ((leadingQuotesIndex = str.indexOf("\'", hrefIndex
+ "href=".length())) != -1) { // 形如a
// href='.....'
int TrailingQuotesIndex = str.indexOf("\'",
leadingQuotesIndex + 1);
TrailingQuotesIndex = TrailingQuotesIndex == -1 ? str
.length() : TrailingQuotesIndex;
str = str.substring(leadingQuotesIndex + 1,
TrailingQuotesIndex);
str = urlHandler(str);
System.out.println(str);
list.add(str);
index += "a ".length();
continue;
}
int whitespaceIndex = str.indexOf(" ", hrefIndex
+ "href=".length()); // 形如a href=
//
whitespaceIndex = whitespaceIndex == -1 ? str.length()
: whitespaceIndex;
str = str.substring(hrefIndex + "href=".length(),
whitespaceIndex);
str = urlHandler(str);
list.add(str);
System.out.println(str);
}
index += "a ".length();
}
}
return list;
}
public static void main(String[] args) throws Exception {
GetLinks gl = new GetLinks("");
ListString list = gl.getAnchorTagUrls();
for(String str:list) {
System.out.println(str);
}
}
}
java中的url的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于Java中的url、java中的url的信息别忘了在本站进行查找喔。