包含标签：Java 的文章
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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…… -
JSP Request. Getheaders () method: returns all the values of the request header with the specified name
getHeaders(String name) Example <% Enumeration cts = request.getHeaders("accept-encoding"); while(cts.hasMo…… -
Java length() method: get the length of the string
length(); Example String strCom2="C语言中文网"; int length=strCom2.length(); Typical application Define the string …… -
JSP Request. Getdateheader () method: get the long value of the build date object
getDateHeader(String name) Example <% out.println(request.getDateHeader("Expires")); %> -
Other println methods for JSP out objects
public abstract void println(boolean b)throws IOException public abstract void println(char c)throws IOException publi…… -
Java substring() method: evaluate substring (intercept string)
Grammar 1 substring(int beginIndex) Example String strCom = "I Like Java"; String strResult = strCom.substring(3); …… -
JSP application. Getrealpath() method: get the real path of the virtual path
getRealPath(String path) Example <% String path=application.getRealPath("index.jsp"); out.println(path); %…… -
Java UDP communication: Java datagram socket class and datagram packet class
Datagram packet class Datagram socket class Example 1 public static void main(String[] args) { DatagramSocket …… -
Java Map. Clear() method: removes all mapping relationships from the map collection
clear() Example public static void main(String[] args){ Map map = new HashMap(); //定义Map集合 map.put("昨天"…… -
What is a URL? And URL class and urlconnection class
URL concept protocol://resourceName http://www.sun.com/ 协议名：//主机名 http://localhost:8080/Test/admin/logi…… -
JSP include instruction: the instruction that contains the file
<%@include file="file url"%> <%@include file = "welcome.jsp?name=yxq"%> Example <%@include file = "welc…… -
JSP Request. Getuserprincipal() method: returns Java security. Principal object
getUserPrincipal() Example <% Principal p = request.getUserPrincipal(); %> -
Java List. Size () method: returns the number of elements in the list
size() Example public static void main(String[] args){ List<String>list = new ArrayList<String>(); …… -
Java DriverManager. Getlogwriter() method: get the printout stream of the log
getLogWriter() Example PrintWriter out=null; out=DriverManager.getLogWriter(); if(out!=null){ out.println("得到…… -
Java List. Addall() method: adds all elements to the list
Grammar 1 addAll(Collectionc) Example public static void main(String[] args){ List<String>list = new Arra…… -
Java Map. Putall() method: append another map object to the current map collection
putAll(Mapm) Typical application public static void main(String[] args){ Map map1 = new HashMap(); //定义Map集…… -
Java indexof() method: returns the index position of the first occurrence
Grammar 1 indexOf(int ch) Example String strCom = "I like java"; int index = strCom.indexOf(5); Grammar 2 indexOf(i…… -
JSP Out. Getbuffersize() method: get the size of the output stream buffer
getBufferSize() Example <% int size = out.getBufferSize(); out.println("JSP页面的缓冲区大小为:"+size); …… -
JSP Request. Getrequesturi () method: get the relative path of the website accessed by the client
getRequestURI() Example <% String p = request.getRequestURI(); out.println("访问的URI路径为:"+p); %> -
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…… -
Note: Lecture 3 object oriented features in the Java language
[thinking before class] 1. What are objects? What are classes? What are packages? What are interfaces? What are intern…… -
Note: Lecture 6 Java threads and Java applets
[thinking before class] 1. What is a thread? What is the difference between it and a process? What is the applicable d…… -
JSP from simple to deep (3) — adding dynamic content through expressions
In our previous chapters, any HTML file can be transformed into a JSP file by changing its extension to jsp。 Of cours…… -
Here comes tiger j2se1 5 list of new features
Although the Java version has evolved from 1.0 to 1.4 2. However, the Java language itself has not changed much, only ……