自定义MVC
数据库：Oracle
表：User(id,uname,upwd)
自定义Struts框架
一、定义Action接口
import javax.servlet.http.*;
public interface Action {
/**
* 执行方法
* @return
*/
String execute(HttpServletRequest request,HttpServletResponse response);
}
二、根据特定功能实现Action接口（这里用User表添加用户）
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.biz.UserBiz;
import com.biz.impl.UserBizImpl;
import com.entity.User;
import com.mystruts.Action;
/**
* 注册Action 完成注册功能 调用业务层 返回页面
* @author Administrator
*
*/
public class RegAction implements Action {
@Override
public String execute(HttpServletRequest request,
HttpServletResponse response) {
//获取请求内容
String uname = request.getParameter("uname");
String upwd = request.getParameter("upwd");
//创建User 对象 创建UserBizImpl对象
User user = new User(uname,upwd);
UserBiz userBiz = new UserBizImpl();
if(userBiz.reg(user)){
request.getSession().setAttribute("login", user);
return "success";
}else{
request.getSession().setAttribute("msg", "注册失败！");
return "input";
}
}
}
三、ActionFilter(负责请求的转发，将用户的请求交给相应的action进行处理)
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.action.RegAction;
/**
* ActionFilter 负责请求的转发 将用户的请求交给相应的Action进行处理
* @author Administrator
*
*/
public class ActionFilter implements Filter {
private FilterConfig config;
private ActionMappingManager mappingManager;
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1,
FilterChain chain) throws IOException, ServletException {
//强转对象
HttpServletRequest req = (HttpServletRequest)arg0;
HttpServletResponse resp = (HttpServletResponse)arg1;
//获取Action 去执行相应的功能
ActionMapping actionMapping = getActionMapping(req);
Action action = ActionManager.createAction(actionMapping.getClassName());
//调用execute方法执行
String resultname = null;
try{
resultname = action.execute(req, resp);
}catch(Exception ex){
ex.printStackTrace();
}
String result = actionMapping.getResultMap().get(resultname);
//正常得到处理后的返回值 进行页面跳转
if(null==result){
return;
}
resp.sendRedirect(result);
}
@Override
public void init(FilterConfig conf) throws ServletException {
// TODO Auto-generated method stub
this.config = conf;
//获取配置文件
String[] configFiles = null;
String configStr = config.getInitParameter("config");
if(null==configStr || configStr.isEmpty()){
configFiles = new String[]{"mystruts.xml"};
}else{
configFiles = configStr.split(",");
}
this.mappingManager = new ActionMappingManager(configFiles);
}
//得到请求地址 通过请求地址得到对应action 通过request得到请求信息
public ActionMapping getActionMapping(HttpServletRequest request){
//获取上URI
String uri = request.getRequestURI();
//获取请求的路径
String contextPath = request.getContextPath();
//截取获得action路径
String actionPath = uri.substring(contextPath.length());
//获取action名称
String actionName = actionPath.substring(1,actionPath.lastIndexOf('.')).trim();
//获取ActionMapping
ActionMapping actionMapping = null;
actionMapping = mappingManager.getActionMappingName(actionName);
return actionMapping;
}
}
四、配置xml文件，保存sction信息
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mystruts SYSTEM "mystruts.dtd">
<mystruts>
<actions>
<action name="reg" class="com.action.RegAction">
<result name="success">login.jsp</result>
<result name="input">index.jsp</result>
</action>
<action name="login" class="com.action.LoginAction">
<result name="success">success.jsp</result>
<result name="input">login.jsp</result>
</action>
</actions>
</mystruts>
五、创建actionMapping对应xml中action的配置
import java.util.*;
public class ActionMapping {
//对应Action名称
private String name;
//对应Action类
private String className;
//对应result结果 result-name result-value
private Map<String,String> resultMap = new HashMap<String, String>();
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getClassName() {
return className;
}
public void setClassName(String className) {
this.className = className;
}
public Map<String, String> getResultMap() {
return resultMap;
}
public void setResultMap(Map<String, String> resultMap) {
this.resultMap = resultMap;
}
}
六、创建ActionMappingManager负责读取配置信息
import java.io.InputStream;
import java.util.*;
import org.dom4j.*;
import org.dom4j.io.SAXReader;
public class ActionMappingManager {
//创建保存所有action的集合
private static Map<String,ActionMapping> actionMappings = new HashMap<String, ActionMapping>();
/**
* init方法加载Action配置文件
*/
public void init(String configFileName){
try{
if(null==configFileName || configFileName.isEmpty()){
throw new Exception("configFileName为空！");
}
//加载配置文件到输入流
InputStream is = this.getClass().getResourceAsStream("/"+configFileName);
Document doc = new SAXReader().read(is);
Element root = doc.getRootElement();
//找到根节点下的actions节点
Iterator<Element> actionIt = root.elements("actions").iterator();
//获取到actions
Element actions = actionIt.next();
//获取action
Iterator<Element> iter = actions.elementIterator("action");
while(iter.hasNext()){
Element action =iter.next() ;
ActionMapping mapping = new ActionMapping();
//将xml配置文件中读取的action 名称和类存入到actionMapping中
mapping.setName(action.attributeValue("name"));
mapping.setClassName(action.attributeValue("class"));
//将result存入到ActionMapping中
Iterator<Element> results = action.elementIterator("result");
while(results.hasNext()){
Element resultElement = results.next();
String name = resultElement.attributeValue("name");
String result = resultElement.getText();
if(name==null||"".equals(name)){
//设置默认结果 默认success
name="success";
}
mapping.getResultMap().put(name, result);
}
actionMappings.put(mapping.getName(), mapping);
}
}catch(Exception ex){
ex.printStackTrace();
}
}
/**
* 加载配置文件
* @param configureFileNames
*/
public ActionMappingManager(String[] configureFileNames){
for (String configureFileName : configureFileNames) {
init(configureFileName);
}
}
/**
* 根据action名称 获取对应的actionMapping对象
* @param actionName
* @return
*/
public ActionMapping getActionMappingName(String actionName){
if(actionName==null || actionName.isEmpty()){
return null;
}
ActionMapping mapping = this.actionMappings.get(actionName);
if(mapping==null){
System.out.println("Mapping为空");
}
return mapping;
}
}
七、创建ActionManager通过反射创建对应的Action
public class ActionManager {
public static Action createAction(String className){
Class clazz = null;
try {
clazz = Class.forName(className);
return (Action)(clazz).newInstance();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
八、修改web.xml和ActionFilter完成自定义Controller
<filter>
<filter-name>openSessionInView</filter-name>
<filter-class>com.web.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>openSessionInView</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 配置ActionFilter过滤器 -->
<filter>
<filter-name>actionFilter</filter-name>
<filter-class>com.mystruts.ActionFilter</filter-class>
<init-param>
<param-name>config</param-name>
<param-value>mystruts.xml</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>actionFilter</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>