铁子们我们上一次分享的是自定义mvc框架这一次我们来优化自定义mvc框架
1.让中央控制器动态加载存储子控制器package com.tsq.framework;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;
import com.tsq.web.BookAction;
@WebServlet("*.action")
public class DispatcherServlet extends HttpServlet{
// private Map actions = new HashMap();
private ConfigModel configModel;
//程序启动时，只会加载一次
@Override
public void init() throws ServletException {
// actions.put("/book", new BookAction());
// actions.put("/order", new BookAction());
try {
configModel=ConfigModelFactory.bulid();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
super.doGet(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//http://localhost:8080/mvc/book.action?methodName=list
String uri = req.getRequestURI();
// 要拿到/book,就是最后一个/到最后一个，的为止
uri = uri.substring(uri.lastIndexOf("/")
, uri.lastIndexOf("."));
// Action action = actions.get(uri);
//相比于上一种从map集合获取子控制器 当前需要confIg。xml 然后反射实例化
ActionModel actionModel = configModel.pop(uri);
if(actionModel ==null) {
throw new RuntimeException("action 配置错误");
}
//Type是子控制器的全路径名
String type= actionModel.getType();
try {
// type 是Action子控制器全路径名
Action action= (Action)Class.forName(type).newInstance();
// action 是Bookaction
if(action instanceof ModelDriven) {
ModelDriven md=(ModelDriven) action;
//model指的是bookAction中的book实例
Object model = md.getModel();
// 要给model中的属性赋值 要接受前端jsp参数 req.getparammap
// PropertyUtils.getProperty(bean, name);
// 将前端所有参数值封装进实体类
BeanUtils.populate(model,req.getParameterMap());
System.out.println(model);
}
// type是Action子控制器的路径名
// action.execute(req, resp);
action.execute(req, resp);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
2.参数传递封装优化
String bid = request.getParameter("bid");
String bname = request.getParameter("bname");
String price = request.getParameter("price");
Book book = new Book();
book.setBid(Integer.valueOf(bid));
book.setBname(bname);
book.setPrice(Float.valueOf(price));
//bookDao.add(book);
实体类
package com.tsq.web;
public class Book {
private int bid;
private String bname;
private float price;
public int getBid() {
return bid;
}
public void setBid(int bid) {
this.bid = bid;
}
public String getBname() {
return bname;
}
public void setBname(String bname) {
this.bname = bname;
}
public float getPrice() {
return price;
}
public void setPrice(float price) {
this.price = price;
}
@Override
public String toString() {
return "Book [bid=" + bid + ", bname=" + bname + ", price=" + price + "]";
}
}
BookAction
package com.tsq.web; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.tsq.entity.Book; import com.tsq.framework.Action; import com.tsq.framework.ActionSupport; import com.tsq.framework.ModelDriven; public class BookAction extends ActionSupport implements ModelDriven{ private Book book = new Book(); private String list(HttpServletRequest request, HttpServletResponse response) { System.out.println("在同一个servlet中调用list方法"); return "success"; } private void load(HttpServletRequest request, HttpServletResponse response) { System.out.println("在同一个servlet中调用load方法"); } private void edit(HttpServletRequest request, HttpServletResponse response) { System.out.println("在同一个servlet中调用edit方法"); } private void del(HttpServletRequest request, HttpServletResponse response) { System.out.println("在同一个servlet中调用del方法"); } private String add(HttpServletRequest request, HttpServletResponse response) { Book book = new Book(); //bookDao.add(book); System.out.println("在同一个servlet中调用add方法"); return "failed"; } @Override public Book getModel() { return book; } }
Action support
package com.tsq.framework;
import java.io.IOException;
import java.lang.reflect.Method;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ActionSupport implements Action {
@Override
public String execute(HttpServletRequest request, HttpServletResponse response) {
//未来区分当前请求的目的，增删改查的目的，就从前台讲要调用的方法名传递到后台
String methodName = request.getParameter("methodName");
//methodName可能是add/del/edit/list/load/xxx/...
//前台传递什么方法，就调用当前类的方法
try {
Method m = this.getClass().getDeclaredMethod(methodName, HttpServletRequest.class,HttpServletResponse.class);
m.setAccessible(true);
return (String) m.invoke(this, request,response);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
Action
package com.tsq.framework;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public interface Action {
String execute(HttpServletRequest request, HttpServletResponse response) ;
}
3.对于方法的可执行结果转发，重定向优化
//bookList.jsp /index.jsp
String path = forwardModel.getPath();
//拿到是否需要转发配置
boolean redirect = forwardModel.isRedirect();
if(redirect) {
//${pageContext.request.contextPath}
response.sendRedirect(request.getServletContext().getContextPath()+path);
}
else {
request.getRequestDispatcher(path).forward(request, response);
}
4.框架配置文件可变
mvc mvc com.tsq.framework.DispatcherServlet configLocation /luoluo mvc *.action
package com.tsq.framework;
import java.io.InputStream;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class ConfigModelFactory {
public static ConfigModel bulid(String path) throws Exception {
InputStream in = ConfigModelFactory.class.getResourceAsStream(path);
SAXReader sr = new SAXReader();
Document doc = sr.read(in);
List actionEles = doc.selectNodes("/config/action");
ConfigModel configModel = new ConfigModel();
for (Element actionEle : actionEles) {
ActionModel actionModel = new ActionModel();
actionModel.setPath(actionEle.attributeValue("path"));
actionModel.setType(actionEle.attributeValue("type"));
// 将forwardmodel赋值并且添加到actionmodel中
List forwardEles = actionEle.selectNodes("forward");
for (Element element : forwardEles) {
ForwardModel forwardModel = new ForwardModel();
forwardModel.setName(element.attributeValue("name"));
forwardModel.setPath(element.attributeValue("path"));
forwardModel.setRedirect("true".equals(element.attributeValue("redirect")));
actionModel.push(forwardModel);
}
configModel.push(actionModel);
}
return configModel;
}
public static ConfigModel bulid() throws Exception {
String defaultPath = "/config.xml";
return bulid(defaultPath);
}
}
好了本次分享完了下次见
