java 動態代理

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動態代理

//---------------TargetInterfacepackage cn.ms.proxy;public interface TargetInterface {    public void method1();    public String method2();    public int method3(int x);    }//---------------Targetpackage cn.ms.proxy;public class Target implements TargetInterface {    @Override    public void method1() {        System.out.println("method1 running...");    }    @Override    public String method2() {        System.out.println("method2 running...");        return "method2";    }    @Override    public int method3(int x) {        System.out.println("method3 running...");        return x;    }}//---------------ProxyTestpackage cn.ms.proxy;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;public class ProxyTest {    public static void main(String[] args) {        Target target = new Target();        TargetInterface newProxy = (TargetInterface) Proxy.newProxyInstance(                target.getClass().getClassLoader(),                 target.getClass().getInterfaces(),                new InvocationHandler() {                    @Override                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {                        System.out.println("目標方法前邏輯");                        Object invoke = method.invoke(target, args);                        System.out.println("目標方法後邏輯");                        return invoke;                    }                });        newProxy.method1();        System.out.println("------------------ method1  end ------------------");        String returnMethod2 = newProxy.method2();        System.out.println(returnMethod2);        System.out.println("------------------ method2  end ------------------");        int returnMethod3 = newProxy.method3(7);        System.out.println(returnMethod3);        System.out.println("------------------ method3  end ------------------");    }    }

動態代理使用(處理全域亂碼的問題)

package com.ithiema.web.filter;import java.io.IOException;import java.lang.reflect.InvocationHandler;import java.lang.reflect.Method;import java.lang.reflect.Proxy;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;public class EncodingProxyFilter implements Filter {    @Override    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)            throws IOException, ServletException {            final HttpServletRequest httpServletRequest = (HttpServletRequest) request;            HttpServletRequest enhanceRequest = (HttpServletRequest) Proxy.newProxyInstance(                    httpServletRequest.getClass().getClassLoader(),                    httpServletRequest.getClass().getInterfaces(),                    new InvocationHandler() {                        @Override                        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {                            if(method.getName().equals("getParameter")){                                String invoke = (String) method.invoke(httpServletRequest, args);                                invoke = new String(invoke.getBytes("iso-8859-1"), "UTF-8");                                return invoke;                            }                            return method.invoke(httpServletRequest, args);                        }                    });            chain.doFilter(enhanceRequest, response);    }    @Override    public void init(FilterConfig filterConfig) throws ServletException {    }        @Override    public void destroy() {    }}

 

java 動態代理