Write a simple Java EE addition program

First, the installation of Java EE and environment configuration

Tools:

32-bit System preparation eclipse-jee-mars-2-win32.zip,64-bit system Preparation eclipse-jee-mars-2-win32-x86_64.zip

jdk1.7

Maven3.3.9.rar

M2.rar

Environment configuration:

1. Set the Eclipse profile Eclipse.ini, modify the virtual machine path, and add it before-vmargs

-VM E:\jee\jdk1.7\bin\javaw.exe

Note: Use WordPad to open the changes,-VM some computers to change line, some computers do not need to change line

2. Start eclipse, set up maven

Search for "maven" in the menu window-prefrences, open the "Installations" option to set

3. Set the MAVEN local warehouse path

Maven local warehouse By default under C:\Users\ username \.m2, c disk space is usually very tense and needs to be moved to another disk, the steps are as follows:

(1) Modify the Setting.xml file in the Conf folder under the MAVEN root directory (E:\jee\maven-3.3.9) and add a new line:

<localRepository>e:\jee\.m2\repository</localRepository>

(2) Modifying the MAVEN configuration in eclipse

In the menu window--prefrences, open "Maven--user settings", such as:

Click the "Browse ..." button on the "User settings" setting, select the Maven profile, and then click the "Reindex" button below to update the index.

Second, to write a simple addition program

To create a new MAVEN project:

1. Select Menu File-new-maven project, tick "Create a &simple project (skip archetype selection)"

2. Create a new MAVEN project and set the project properties as follows

Addition Program key Code

Addaction.java

 Packagecom.cqvie.action;ImportCom.opensymphony.xwork2.ActionSupport; Public classAddractionextendsActionsupport {PrivateString N1; PrivateString n2; PrivateString N;  PublicString getN1 () {returnN1; }     Public voidsetN1 (String N1) { This. N1 =Ans; }     PublicString getN2 () {returnN2; }     Public voidsetN2 (String n2) { This. N2 =N2; }     PublicString Getn () {returnN; }     Public voidSetn (String N) { This. N =N; }    /*** Bnhi 綍 *@return     */     PublicString Add () {n=n1+N2; returnN; }}

add.jsp

<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "    pageencoding=" UTF-8 "%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >            Name: <input type= "text" name= "N1"/>            Name:<input type= "text" name= "n2"/> <input                        Type= "Submit" value= "="/>        </form>    </body>
add_success.jsp
<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "    pageencoding=" UTF-8 "%><%--<%@ taglib prefix=" s "uri="/struts-tags "%>--% ><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >
Struts.xml
<?xml version= "1.0" encoding= "UTF-8"?> <!DOCTYPE Struts public"-//apache software foundation//dtd Struts Configuration 2.0//en" "Http://struts.apache.org/dtds/struts-2.0.dtd" > <struts> <constant name= "struts.i18n.encoding" value= "Utf-8" ></constant> <constant name= "Strut S.multipart.maxsize "value=" 20971520 "/> <constant name=" Struts.devmode "value=" true "/> < PackageName= "P_user" namespace= "/"extends= "Struts-default" > <action name= "Add"class= "Com.cqvie.action.AddAction"Method= "Add" > <result name= "Success" >/add_success.jsp</result> </action> </ Package></struts>
index.jsp
<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "    pageencoding=" UTF-8 "%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >
3. Run the project
Choose Menu "Run"-"Run Configurations", set as:
4. View the results in the browser
Address bar Enter "http://localhost:9527/add/" to view results
Write a simple Java EE addition program