Java
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Java replace() method: string replacement
Grammar 1 replace(char oldChar,char newChar); Example String str = "C语言中文网"; str = str.replace("C语言中文网","…… -
JSP Request. Getrequestedsessionid() method: get the session ID value of the website visited by the client
getRequestedSessionId() Example <% out.println(request.getRequestedSessionId()); %> -
JSP Response. Setheader() method: set header information
setHeader(String name,value) Example <% out.println(new Date()); response.setHeader("Refresh","1"); %> …… -
JSP Page. GetClass () method: get the page object
getClass() Example <% out.println("当前JSP页面的类是:"+page.getClass()); %> -
Java Connection. Createstatement () method: create a statement object
Grammar 1 createStatement() Example Connection conn = …… //省略部分代码 Statement st = conn.createStatement(); Gram…… -
JSP Request. Isrequestedsessionidfromcookie() method: judge whether the session ID is obtained from the cookie
isRequestedSessionIdFromCookie() Example <% out.println("from cookie"+request.isRequestedSessionIdFromCookie()…… -
Priority and execution order of Java threads
Priority overview public final void setPriority(int newPriority); public final int getPriority(); Use priority Exa…… -
Java Statement. Addbath() method: add batch statement
addBatch(String sql) Typical application public void bathInsert(){ Connection conn=getCon(); //省略部分代码 …… -
JSP application. Log() method: write information to the log file of the servlet
Syntax 1: log(String msg) Example <% application.log("specified message"); %> Grammar 2 log(String message…… -
Java format() method: format string
Grammar 1 format(String format,Object……args) Example String str = String.format("%d",400/2); String str2 = String.f…… -
JSP application. Removeattribute() method: removes the specified attribute
removeAttribute(String name) Example <% application.setAttribute("user","lzw"); application.removeAttribute…… -
Java Connection. Close() method: close the connection object
close() Example Connection conn = …… //省略部分代码 conn.close(); //将连接关闭 -
Jsp: setproperty: property value setting tag
< jsp: setproperty name = "bean instance name" {property = "*" | property = "propertyname" | property = "propertyna…… -
JSP Response. Containsheader() method: judge whether the HTTP file header with the specified name already exists
addIntHeader(String name,int value) Example <%=new Date()%> <% response.addheader("Refresh","1"); …… -
Implementation of Java multithreading
Inherit thread class public class Thread implements Runnable public class NewThreadName extends Thread { //New…… -
JSP PageContext. GetException () method: get the current exception object
getException() Example <%@page language="java" errorPage="error.jsp" pageEncoding="GBK"%> <% Integ…… -
JSP PageContext. Getsession () method: returns the current session object
getSession() Example <% HttpSession s = pageContext.getSession(); s.setAttribute("user","C语言中文网"); %&…… -
Java List. Iterator () method: iterates over the list elements
iterator() Typical application public static void main(String[] args){ List<String>list = new ArrayList&l…… -
JSP Page. Equals () method: compare two objects
equals(Object obj) Example <% boolean b = page.equals(page); out.print(b); %> -
Java Connection. Commit() method: commit the transaction
commit() Example Connection conn = …… //省略部分代码 conn.setAutoCommit(false); //先将事务设为手动提交 Statement…… -
Note: Lecture 8 Java network programming
Think before class 1 What is TCP / IP protocol? 2. What are the two transmission protocols of TCP / IP and what ar…… -
Feel the characteristics of Java data object JDO 2.0 query language (3)
The query feature extended by manufacturers JDO manufacturers can provide jdoql with a variety of special query functi…… -
JSP from simple to deep (12) — form editing
For example, the flag library from the blazix server cannot be used in your system environment, so what about not usin…… -
Several problems easily confused by java beginners
1. String class and StringBuffer class are both classes that handle strings, but they have one biggest difference,…… -
JSP from simple to deep (6) — JSP declaration
Now the JSP you write will become a class definition. All the scriptlets you write should be placed in a method of thi…… -
Establishment of Tomcat environment
Tomcat is another excellent JSP server developed on the basis of sun's jswdk. It not only supports servlet, but also p…… -
JSP from shallow to deep (9) — JSP sessions
On a classic website, visitors can browse several web pages and perform some interactive behavior. If you are writing …… -
Note: Lecture 7 swing user interface design
[thinking before class] 1. What is swing? What are its advantages over AWT? What are the differences in use? 2. What a…… -
JSP from shallow to deep (11) — tag library
JSP 1.1 proposes a method of extending JSP flag, which is named "flag library". These libraries allow additional flags…… -
Feel the characteristics of Java data object JDO 2.0 query language (1)
The improvement of query language is jdo2 0 specification. This paper expounds jdo2 from a higher level Some new featu…… -
JSP from shallow to deep (8) — JSP Tags
Another important syntax of JSP is tags. JSP tags does not use <%, but only the < character. JSP tag is a bit li…… -
Note: Lecture 4 exception handling and I / O flow in Java
[thinking before class] 1. What are exceptions? What are the two exception handling mechanisms in Java? 2. What are th……