标签：blog http io ar os sp java for 文件
这星期的实验，终于调好了。一句话，麻雀虽小，五脏俱全。相信刚学struts2的同学可以通过该实验可以更好地理解struts的结构和mvc
登录的之前写过，这里直接进入用户管理
用struts2都要在src文件夹下建个struts.xml文件，文件名不能写错。这里直接贴上整个project定义到的action,了解下语法就可以了，以后具体用到再根据项目去改
<?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为配置文件根元素 -->
<struts>
<!-- Action必须放在指定的包名空间中 -->
<package name="user" extends="struts-default">
<action name="queryAll" class="UserAction" method="queryAll">
<result name="success">/index.jsp</result>
</action>
<action name="delete" class="UserAction" method="delete">
<result name="success" type="chain">queryAll</result>
</action>
<action name="insert" class="UserAction" method="insert">
<result name="success" type="chain">queryAll</result>
</action>
<action name="edit" class="UserAction" method="edit">
<result name="success" type="chain">queryAll</result>
</action>
<action name="queryUserById" class="UserAction" method="queryUserById">
<result name="success">edit.jsp</result>
</action>
</package>
</struts>
WebRoot/WEB-INF下有个web.xml,得定义struts过滤器,直接看代码清楚些。这部分固定不变的，以后用到可以直接copy过去
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
用户模型User.java,模型都是一些属性和getter、setter方法，不想每次手动写所有的getter、setter方法可以右击选中Generate Getter and Setters...设置生成相应的方法
public class User {
public int id;
public String username;
public String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
接下来一个DataBaseConn.java,用于获取数据库连接
import java.sql.*;
public class DataBaseConn {
static Connection conn;
public static Connection getConnection(){
try {
Class.forName("com.mysql.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "686175");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
public void close(){
if(conn!=null){
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
QueryUpdate.java,业务逻辑层
import java.util.ArrayList;
import java.sql.*;
public class QueryUpdate {
Connection conn;
Statement stmt;
ResultSet rs;
String sql=null;
public QueryUpdate(){
conn=DataBaseConn.getConnection();
try {
stmt=conn.createStatement();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public ArrayList<User> queryAll(){
ArrayList<User> users=new ArrayList<User>();
try {
sql="select * from user";
rs=stmt.executeQuery(sql);
while(rs.next()){
User user=new User();
user.setId(rs.getInt(1));
user.setUsername(rs.getString(2));
user.setPassword(rs.getString(3));
users.add(user);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return users;
}
public User queryUserById(int id){
User user=new User();
sql="select * from user where id='"+id+"'";
try {
rs=stmt.executeQuery(sql);
if(rs.next()){
user.setId(rs.getInt(1));
user.setUsername(rs.getString(2));
user.setPassword(rs.getString(3));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return user;
}
public void delete(int id){
sql="delete from user where id='"+id+"'";
try {
stmt.executeUpdate(sql);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void insert(String username,String password){
try {
int count=1;
sql="select * from user";
rs=stmt.executeQuery(sql);
if(rs.next()){
rs.last();
count=rs.getInt(1)+1;
}
sql="insert into user values('"+count+"','"+username+"','"+password+"')";
stmt.executeUpdate(sql);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void edit(int id,String username,String password){
try {
sql="update user set username='"+username+"', password='"+password+"' where id='"+id+"'";
stmt.executeUpdate(sql);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
下面是一个Action类UserAction.java，struts都是用action处理的
import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport{
int id;
String username;
String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String queryAll(){
QueryUpdate qu=new QueryUpdate();
ArrayList<User> users=new ArrayList<User>();
users=qu.queryAll();
HttpServletRequest request=ServletActionContext.getRequest();
request.setAttribute("all", users);
return "success";
}
public String queryUserById(){
QueryUpdate qu=new QueryUpdate();
User user=new User();
user=qu.queryUserById(this.getId());
HttpServletRequest request=ServletActionContext.getRequest();
request.setAttribute("user", user);
return "success";
}
public String delete(){
QueryUpdate qu=new QueryUpdate();
qu.delete(this.getId());
return "success";
}
public String insert(){
QueryUpdate qu=new QueryUpdate();
qu.insert(this.getUsername(), this.getPassword());
return "success";
}
public String edit(){
QueryUpdate qu=new QueryUpdate();
qu.edit(this.getId(),this.getUsername(),this.getPassword());
return "success";
}
}
表现层
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<table border="1">
<tr>
<td>编号</td>
<td>账号</td>
<td>密码</td>
<td>编辑</td>
<td>删除</td>
</tr>
<s:iterator value="#request.all" id="user">
<tr>
<td><s:property value="#user.id"/></td>
<td><s:property value="#user.username"/></td>
<td><s:property value="#user.password"/></td>
<td><a href="queryUserById.action?id=<s:property value='#user.id'/>">修改</a></td>
<td><a href="delete.action?id=<s:property value='#user.id'/>">删除</a></td>
</tr>
</s:iterator>
</table>
<a href="insert.jsp">添加新用户</a>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page isELIgnored="false"%>
<html>
<head>
<title>My JSP 'edit.jsp' starting page</title>
<body>
<form action="edit.action" method="post">
编号<input type="text" name="id" value="${user.id}" readonly="readonly"/><br>
用户名<input type="text" name="username" value="${user.username}"/><br>
密码 <input type="password" name="password" value="${user.password}"/><br>
<input type="submit" value="更新 "/>
<input type="reset" value="取消"/>
</form>
</body>
</html>
编号设为只读也可以用disabled="true",差别就是用disabled界面是灰色的看不太清id值；用readonly虽然看起来和username、password差不多，如果想删除id，程序会跳回index.jsp,da
添加新用户insert.java<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>My JSP 'insert.jsp' starting page</title>
</head>
<body>
<s:form action="insert" method="post">
<s:textfield key="username" label="用户名"/>
<s:password key="password" label="密码"/>
<td><s:submit value="登录"/>
<s:reset value="取消"/><td>
</s:form>
</body>
</html>
在浏览器输入地址http://localhost:8080/struts2_mvc/queryAll.action便进入主页面
标签：blog http io ar os sp java for 文件
原文地址：http://blog.csdn.net/lindonglian/article/details/41253211
