「javaurl链接」java访问url

博主：adminadmin 2023-01-09 10:48:13 771

本篇文章给大家谈谈javaurl链接，以及java访问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代码连接数据库url怎么获取

都有统一的格式的,如下:

Microsoft SQL Server JDBC Driver （一般用来连接 SQLServer 2000）

驱动程序包名：msbase.jar mssqlserver.jar msutil.jar

驱动程序类名: com.microsoft.jdbc.sqlserver.SQLServerDriver

JDBC URL: jdbc:microsoft:sqlserver://server_name:port

默认端口1433，如果服务器使用默认端口则port可以省略

Microsoft SQL Server 2005 JDBC Driver

驱动程序包名：sqljdbc.jar

驱动程序类名: com.microsoft.sqlserver.jdbc.SQLServerDriver

JDBC URL: jdbc:sqlserver://server_name:port

默认端口1433，如果服务器使用默认端口则port可以省略

Oracle

Oracle Thin JDBC Driver

驱动程序包名：ojdbc14.jar

驱动程序类名: Oracle.jdbc.driver.OracleDriver

JDBC URL:

jdbc:oracle:thin:@//host:port/ServiceName

或

jdbc:oracle:thin:@host:port:SID

java链接mysql数据库url怎么写

连接代码如下：

public static void main(String[] args){

// 驱动程序名

String driver = "com.mysql.jdbc.Driver";

// URL指向要访问的数据库名scutcs

String url = "jdbc:mysql://127.0.0.1:3306/scutcs";

// MySQL配置时的用户名

String user = "root";

// MySQL配置时的密码

String password = "root";

try {

// 加载驱动程序

Class.forName(driver);

// 连续数据库

Connection conn = DriverManager.getConnection(url, user, password);

if(!conn.isClosed())

System.out.println("Succeeded connecting to the Database!");

// statement用来执行SQL语句

Statement statement = conn.createStatement();

// 要执行的SQL语句

String sql = "select * from student";

// 结果集

ResultSet rs = statement.executeQuery(sql);

System.out.println("-----------------");

System.out.println("执行结果如下所示:");

System.out.println("-----------------");

System.out.println(" 学号" + "\t" + " 姓名");

System.out.println("-----------------");

String name = null;

while(rs.next()) {

// 选择sname这列数据

name = rs.getString("sname");

// 首先使用ISO-8859-1字符集将name解码为字节序列并将结果存储新的字节数组中。

// 然后使用GB2312字符集解码指定的字节数组

name = new String(name.getBytes("ISO-8859-1"),"GB2312");

// 输出结果

System.out.println(rs.getString("sno") + "\t" + name);

}

rs.close();

conn.close();

} catch(ClassNotFoundException e) {

System.out.println("Sorry,can`t find the Driver!");

e.printStackTrace();

} catch(SQLException e) {

e.printStackTrace();

} catch(Exception e) {

e.printStackTrace();

}

java编程 关于URL类链接的问题

package com.cstp.Servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.cstp.Bean.UserBean;

import com.cstp.Dao.Users;

public class CheckLogin extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {

static final long serialVersionUID = 1L;

public CheckLogin() {

super();

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

//根据cookie里的内容判断 用户是否在线状态和用户名是否存在

boolean islogin=false;

String username = "";

Cookie[] c=request.getCookies();

if(c!=null){

for(Cookie e:c){

String name=e.getName();

String value=e.getValue();

if("old".equals(name)){

//dopost方法里要求记住账号登陆成功后增加的有个cookie是（"old","1"）

islogin=(name.equals("1"));

}

if("user".equals(name)){

username=value;

}

}

if(isloginusername.trim().length()0){

request.getRequestDispatcher("/main.jsp").forward(request, response);

}}

else

request.getRequestDispatcher("/login.html").forward(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String username=request.getParameter("username");

String password=request.getParameter("password");

String isadmin=request.getParameter("isadmin");

String isrecord=request.getParameter("isrecord");

Users user=new Users();

//填充JavaBean

UserBean ub=new UserBean();

ub.setUsername(username);

ub.setPassword(password);

ub.setIsadmin(isadmin);

ub=user.CheckUser(ub);

request.getSession().setAttribute("ub",ub);

if(ub!=null){

if(isrecord!=null"record".equals(isrecord)){

Cookie c1=new Cookie("old","1");

c1.setMaxAge(100000);

c1.setDomain("");//设置域

Cookie c2=new Cookie("user",username);

c2.setMaxAge(100000);

c2.setDomain("");//设置域

response.addCookie(c1);

response.addCookie(c2);

}

//============================================

if(ub.getIsadmin()!=null){

if("yes".equals(ub.getIsadmin())){

request.getRequestDispatcher("/admin.html").forward(request, response);

}

else if("no".equals(ub.getIsadmin())){

request.getRequestDispatcher("/main.jsp").forward(request, response);

}

else

request.getRequestDispatcher("/fail.html").forward(request, response);

}

else

request.getRequestDispatcher("/main.jsp").forward(request, response);

//============================================

}

else

request.getRequestDispatcher("/fail.html").forward(request, response);

}

}

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();

javaurl链接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访问url、javaurl链接的信息别忘了在本站进行查找喔。

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