封装baseControl

package com.huawei.base;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* @author Administrator
*
*/
public abstract class BaseController extends HttpServlet{

/**
*
*/
private static final long serialVersionUID = 4874135853046529162L;

protected HttpServletRequest request;

protected HttpServletResponse response;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req, resp);
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String _method = req.getParameter("_method");
_method = (_method == null)?"":_method;
/**
* 做一个反射的中转站
*
* 根据传入的_method 动态的去调用 所对应的方法
*
*
* eg:_method :delete
*/
//得到 目标class
Class<?> clazz = this.getClass();
this.request = req;
this.response = resp;
try {
//得到 指定的方法
Method method = clazz.getDeclaredMethod(_method,new Class[]{HttpServletRequest.class,HttpServletResponse.class});
//执行对应的方法
boolean access = method.isAccessible();
method.setAccessible(true);
method.invoke(this, req,resp);
method.setAccessible(access);
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
this.findAll(req, resp);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}

protected void findAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
String _method = this.getParameter("_method");
if(_method == null || _method.trim()==""){
response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, "缺少方法名!");
}else{
response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, "该"+_method+"没有被实现!");
}
}

protected String getParameter(String name){
return this.request.getParameter(name);
}

protected String[] getParameterValues(String name) {
return this.request.getParameterValues(name);
}

protected PrintWriter getWriter() {
try {
return this.response.getWriter();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

protected OutputStream getOutputStream() {
try {
return this.response.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

protected void write(String msg){
this.getWriter().write(msg);
}

}