包含标签：Java 的文章
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JSP Request. Isrequestedsessionidvalid() method: Returns whether the session is valid
isRequestedSessionIdValid() Example <% out.println("Session是否有效"+request.isRequestedSessionIdValid()); %&…… -
Jsp: forward: request forwarding tag
The < jsp: param > sub tag is used to pass parameters to the dynamic target file. The key codes are as follows: …… -
Java Statement. Getgeneratedkeys() method: get the automatically generated key
getGeneratedKeys() Example Connection conn = …… //省略部分代码 Statement stmt = conn.createStatement(); //获取Sta…… -
Java lastindexof() method: returns the index position of the last occurrence
Grammar 1 lastIndexOf(int ch) Example String strCom = "abcdefg gfdecba"; int index = strCom.lastIndexOf("a"); Gramm…… -
JSP config. The getinitparameter () method gets the value of the initial parameter
getInitParameter(String name) Example <% String name = config.getInitParameter("fork"); out.println("parame…… -
Java Map. Keyset() method: get all the key names of the map set
keySet() Typical application public static void main(String[] args){ Map map = new HashMap(); //定义Map集合 …… -
Java Map. Isempty() method: judge whether the map collection object contains content
isEmpty() Example public static void main(String[] args){ System.out.println("创建Map集合对象"); Map map =…… -
JSP Request. Getremoteaddr() method: get the IP address of the requesting client
getRemoteAddr() Example <% String p = request.getRemoteAddr(); out.println("客户端的IP地址为:"+p); %> -
Comparison of Java strings (equals(), equalsignorecase(), compareto())
Equals() method 字符串1.equals(字符串2); String str1="abc"; String str2=new String("abc"); String str3="ABC"; S…… -
What is JSP? What are the advantages of JSP?
1) Precompiled 2) Separation of business codes 3) Component reuse 4) Cross platform -
JSP config. Getinitparameter() method: get the value of the initial parameter
getInitParameter(String name) Example <% String name = config.getInitParameter("fork"); out.println("parame…… -
JSP PageContext. Forward() method: forward page
forward(String relativeUrlPath) Example <% pageContext.forward("count.jsp"); %> Typical application &l…… -
Detailed explanation of Java two-dimensional array: Declaration and initialization of two-dimensional array, and obtaining the value of two-dimensional array
Create a 2D array type array[][]; type[][] array; int[][] age; char[][] sex; Initialize 2D array array=new typ…… -
JSP Request. Getcharacterencoding() method: returns the character encoding format
getCharacterEncoding() Example <% String encoding = request.getCharacterEncoding(); out.println("请求页面的…… -
JSP Request. Getauthtype () method: returns the authentication scheme name of the protection servlet
getAuthType() Example <% out.print(request.getAuthType()); %> -
JSP application. Getminorversion() method: returns the minimum version number of servlet API supported by the server
getMinorVersion() Example <% int i = application.getMinorVersion(); //获取服务器支持的Servlet API最小版本号 …… -
JSP Page. Hashcode () method: returns the hash code value of the object
hashCode() Example <% out.print(page.hashCode()); %> -
JSP Out. Print () method: output data to JSP page
Grammar 1 print(boolean b) Example <% out.print(3>2); %> Grammar 2 print(char c) Example <% …… -
JSP application. Getresource () method: get the URL path of the specified resource
getResource(String path) Example <% URL url=application.getResource("index.jsp"); out.println(url); %> -
Java DriverManager. Println() method: output log
println(String message) Example DriverManager.println("获取驱动成功！"); -
JSP Exception. Printstacktrace() method: outputs abnormal stack trace
Grammar 1 printStackTrace() Example <%@page language="java" errorPage="error.jsp" pageEncoding="GBK"%> <…… -
JSP application. Setattribute() method: set attribute
setAttribute(String name,Object object) Example <% application.setAttribute("user","lzw"); Date Now = new D…… -
JSP PageContext. Setattribute() method: set attribute
setAttribute(String name,Object value,int scope) Example <% pageContext.setAttribute("user","lzw",pageContext.…… -
JSP PageContext. Include () method: include the file in the page
Grammar 1 include(String relativeUrlPath) Example <%@page language="java" pageEncoding="GBK"%> <% …… -
Java Set. Remove() method: removes the specified object from the set collection
remove(Object o) Typical application public static void main(String[] args){ Set set = new HashSet(); //定义Se…… -
JSP Request. Getcontextpath() method: returns the directory where the current web is located
getContextPath() Example <% out.print(request.getContextPath()); %> -
JSP Exception. Initcause() method: sets the exception information of initialization
initCause(Throwable cause) Example <%@page language="java" pageEncoding="GBK" errorPage="error.jsp"%> <%…… -
JSP Request. Getquerystring() method: get query string
getQueryString() Example <a href="https://www.jb51.ccindex.jsp?JavaCore">以Get方法发送的查询字符串</a>&l…… -
How to learn java for beginners (with java learning route)
Java learning route Java EE beginner Java EE intermediate Java EE advanced -
Java TCP communication: Java ServerSocket class and socket class
ServerSocket class Construction method of ServerSocket try { ServerSocket serverSocket=new ServerSocket(8111);…… -
Java stop (terminate) thread detailed version
Unstoppable thread Example 1 package ch14; public class MyThread13 extends Thread { @Override public vo……