java獲取url中的域名

1、Java請求一個URL。獲取網站返回的數據。

public static String SendGET(String url,String param){
   String result="";//訪問返回結果
   BufferedReader read=null;//讀取訪問結果
   
   try {
    //創建url
    URL realurl=new URL(url+"?"+param);
    //打開連接
    URLConnection connection=realurl.openConnection();
     // 設置通用的請求屬性
             connection.setRequestProperty("accept", "*/*");
             connection.setRequestProperty("connection", "Keep-Alive");
             connection.setRequestProperty("user-agent",
                     "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
             //建立連接
             connection.connect();
          // 獲取所有響應頭欄位
             Map<String, List<String>> map = connection.getHeaderFields();
             // 遍歷所有的響應頭欄位，獲取到cookies等
             for (String key : map.keySet()) {
                 System.out.println(key + "--->" + map.get(key));
             }
             // 定義 BufferedReader輸入流來讀取URL的響應
             read = new BufferedReader(new InputStreamReader(
                     connection.getInputStream(),"UTF-8"));
             String line;//循環讀取
             while ((line = read.readLine()) != null) {
                 result += line;
             }
   } catch (IOException e) {
    e.printStackTrace();
   }finally{
    if(read!=null){//關閉流
     try {
      read.close();
     } catch (IOException e) {
      e.printStackTrace();
     }
    }
   }
    
   return result; 
 }

2、java獲取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;

}

/**
* 處理鏈接的相對路徑
* @param link 相對路徑或絕對路徑
* @return 絕對路徑
*/
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 List<String> getAnchorTagUrls() {
if (webSource == null) {
System.out.println("沒有網頁源代碼");
return null;
}
ArrayList<String> list = new ArrayList<String>();
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=
// http://www.網路.com >
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("http://www.網路.com");
List<String> list = gl.getAnchorTagUrls();
for(String str:list) {
System.out.println(str);
}
}
}

3、給你一個url，用java怎獲取url里的屬性？？？請各位大俠幫個忙，最好有代碼

把能找到的參數都付給argsarr數組，將來可以用argsarr[i]進行相應的訪問，方法不錯，太長，參數不容易記憶。
//提取URL中的參數
function getArgs()
{
//定義一個數組，用於存放取出來的字元串參數。
var argsArr = new Object();

//獲取URL中的查詢字元串參數
var query = window.location.search;
query = query.substring(1);

//這里的pairs是一個字元串數組
//name=myname&password=1234&sex=male&address=nanjing
var pairs = query.split("&");

for(var i=0;i<pairs.length;i++)
{
var sign = pairs[i].indexOf("=");

//如果沒有找到=號，那麼就跳過，跳到下一個字元串（下一個循環）。
if(sign == -1)
{
continue;

}

var aKey = pairs[i].substring(0,sign);
var aValue = pairs[i].substring(sign+1);

argsArr[aKey] = aValue;
}

return argsArr;
}

4、怎麼用java獲取瀏覽器中url的值，比如自己編寫一個程序，當前瀏覽器顯示為百度，如何獲取url詳細一點

這個頁面的路徑都是自己指定的，那有獲取的

5、java中 如何獲取客戶端請求的url

在servlet中的request對象中有url，可以用方法 getRequestURI（）.
如果在程序中得不到該請求的request對象 那就得不到。

所以得到url的 關鍵是 先得到 request

6、java中如何實現URL類?

java中實現URL類，可以使用java工具類中的URL的類，實例如下：

import java.io.*;
import java.net.*;
public class URLTest
{
public static void main(String[] args)
{
try
{
URL url=new URL("http://sports.163.com:80/nba/");//創建資源類型
String protocol=url.getProtocol();//獲取資源類型
String host=url.getHost();//獲取域名
int port=url.getPort();//獲取埠
String file=url.getFile();//獲取路徑
System.out.println("url地址的資源類型為："+protocol+"域名為："+host+"埠為:"+port+"路徑為:"+file);
InputStream is=url.openStream();//獲取頁面信息流
BufferedReader bfr=new BufferedReader(new InputStreamReader(is));//封裝成字元流
String len;
while((len=bfr.readLine())!=null)
{
System.out.println(len);
}
bfr.close();
is.close();
}
catch(MalformedURLException e)
{
System.out.println("創建URL對象發生異常");
}
catch(IOException e)
{
System.out.println("發生IO操作異常");
}
}
}

7、誰有截取url中 一級域名的 java代碼

String url = request.getScheme()+"://"; //請求協議 http 或 https
url+=request.getHeader("host"); // 請求伺服器
url+=request.getRequestURI(); // 工程名
if(request.getQueryString()!=null) //判斷請求參數是否為空
url+="?"+request.getQueryString(); // 參數

8、java 獲取url 中的參數請問以下代碼中的 url地址該怎麼寫

String
url
=
request.getScheme()+"://";
//請求協議
http
或
https
url+=request.getHeader("host");
//
請求伺服器
url+=request.getRequestURI();
//
工程名
if(request.getQueryString()!=null)
//判斷請求參數是否為空
url+="?"+request.getQueryString();
//
參數

9、java的substring取得url地址

public class StringTest {

/**
* @param args
*/
public static void main(String[] args) {
String str = "http://.網路.com/new?word=java%E7%9A%84substring%E5%8F%96%E5%BE%97url%E5%9C%B0%E5%9D%80";

System.out.println(str.indexOf("/", 8));
System.out.println(str.substring(0, str.indexOf("/", 8)));
}

}

10、java提取網站內部所有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;

}

/**
* 處理鏈接的相對路徑
* @param link 相對路徑或絕對路徑
* @return 絕對路徑
*/
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 List<String> getAnchorTagUrls() {
if (webSource == null) {
System.out.println("沒有網頁源代碼");
return null;
}
ArrayList<String> list = new ArrayList<String>();
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=
// http://www.baidu.com >
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("http://www.baidu.com");
List<String> list = gl.getAnchorTagUrls();
for(String str:list) {
System.out.println(str);
}
}
}