{"rsdb":{"rid":"376027","subhead":"","postdate":"0","aid":"263389","fid":"54","uid":"1","topic":"1","content":"

\u524d\u8a00\uff1a  \u65e9\u671f\u5b66\u4e60\u4e86\u52a8\u6001\u4ee3\u7406\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u7684\u4f7f\u7528\u573a\u666f\u548c\u4f7f\u7528\u65b9\u6cd5\uff0c\u6211\u4eec\u4e5f\u77e5\u9053\u4e86\u6700\u7ecf\u5178\u7684mybatis\u7684mapper\u5c31\u662f\u91c7\u7528\u52a8\u6001\u4ee3\u7406\u6765\u5b9e\u73b0\u7684\uff0c\u90a3\u4e48\u52a8\u6001\u4ee3\u7406\u7684\u80cc\u540e\u662f\u600e\u6837\u7684\u539f\u7406\uff1f\u4e3a\u4ec0\u4e48\u80fd\u5b9e\u73b0\u52a8\u6001\u4ee3\u7406\uff1f\u4e3a\u4ec0\u4e48\u52a8\u6001\u4ee3\u7406\u53ea\u53ef\u4ee5\u4ee3\u7406\u63a5\u53e3\uff0c\u800c\u65e0\u6cd5\u4ee3\u7406\u666e\u901a\u7c7b\uff1f\u4e3a\u4ec0\u4e48\u52a8\u6001\u4ee3\u7406\u9700\u8981\u4f20\u5165\u7c7b\u7684classLoder\u548c\u63a5\u53e3\uff1f\u5e26\u7740\u8fd9\u4e9b\u7591\u95ee\uff0c\u6211\u4eec\u6765\u5f00\u542f\u672c\u671f\u7684\u4e3b\u9898\uff1a\u63a2\u7a76\u52a8\u6001\u4ee3\u7406\u7684\u5185\u90e8\u539f\u7406\u3002<\/p>

\u672c\u7bc7\u535a\u5ba2\u7684\u76ee\u5f55<\/p>

\u4e00\uff1a\u52a8\u6001\u4ee3\u7406\u7684\u57fa\u672c\u4f7f\u7528\u65b9\u6cd5<\/p>

\u4e8c\uff1a\u52a8\u6001\u4ee3\u7406\u7684\u5185\u90e8\u8fd0\u884c\u8fc7\u7a0b<\/p>

\u4e09\uff1a\u51e0\u4e2a\u76f8\u5173\u7684\u95ee\u9898<\/p>

\u56db\uff1a\u603b\u7ed3<\/p>

\u4e00\uff1a\u52a8\u6001\u4ee3\u7406\u7684\u57fa\u672c\u4f7f\u7528\u65b9\u6cd5<\/p>

 1.1:\u7b80\u5355\u4f8b\u5b50<\/p>

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1.2:\u4ee3\u7406\u63a5\u53e3<\/p>

\u9996\u5148\u6211\u4eec\u6765\u5b9a\u4e49\u4e00\u4e2asinger\u63a5\u53e3\u8868\u793a\u6211\u4eec\u5c06\u8981\u4ee3\u7406\u7684\u63a5\u53e3\uff1a<\/p>

 <\/p>

public interface Singer {
    \/**
    * \u8868\u6f14
    * @param soonName
    *\/
    public void perform(String soonName);
}<\/p>

 <\/p>

1.3:\u63a5\u53e3\u7684\u5177\u4f53\u5b9e\u73b0\u7c7b<\/p>

 <\/p>

public class Jay implements Singer {
 
    public void perform(String soonName) {
        System.out.println("\u63a5\u4e0b\u6765\u6211\u4e3a\u5927\u5bb6\u5531\u4e00\u9996"+soonName);
    }
}<\/p>

 <\/p>

1.4:\u8f85\u52a9\u7c7b,\u7528\u6765\u6a21\u62df\u6ce8\u518c\u4eba\u7684\u524d\u540e\u53f0\u8bcd<\/p>

 <\/p>

public class Presenter  {<\/p>

    public void before(){
        System.out.println("\u8bf7\u5f00\u59cb\u4f60\u7684\u8868\u6f14!");
    }<\/p>

    public void after(){
        System.out.println("\u8868\u6f14\u7ed3\u675f,\u5927\u5bb6\u9f13\u638c!");
    }
}<\/p>

 <\/p>

1.5:\u5177\u4f53\u7684\u4ee3\u7406\u7c7b<\/p>

  \u8fd9\u91cc\u7528proxy.newProxyInstance\u6765\u521b\u5efa\u4e00\u4e2a\u4ee3\u7406\u7c7b\uff0c\u4f20\u5165\u539f\u59cb\u7c7b\u7684\u7c7b\u52a0\u8f7d\u5668\u548c\u63a5\u53e3\u4e0e\u63a5\u53e3InvocationHandler\uff0c\u540c\u65f6\u63d2\u5165Presenter\u7c7b\u7684before\u4e0eafter\u65b9\u6cd5\uff0c\u7528\u4e8e\u524d\u7f6e\u548c\u540e\u7f6e\u5904\u7406<\/p>

 <\/p>

public class SingerProxy {<\/p>

  private Presenter presenter;<\/p>

  public SingerProxy(Presenter presenter){
      this.presenter = presenter;
  }
    \/**
    * \u83b7\u53d6\u4ee3\u7406\u5bf9\u8c61
    * @return
    *\/
    public Singer getProxy(){<\/p>

        final Singer jay = new Jay();
        Singer singerProxy = (Singer)Proxy.newProxyInstance(jay.getClass().getClassLoader(), jay.getClass().getInterfaces(), new InvocationHandler() {\u300d
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                presenter.before();
                method.invoke(jay, args);
                presenter.after();
                return null;
            }
        });
        return singerProxy;
    }
}<\/p>

 <\/p>

1.6:\u6d4b\u8bd5\u7c7b<\/p>

 <\/p>

public class Test {
    public static void main(String[] args) {
        SingerProxy singerProxy = new SingerProxy(new Presenter());
        Singer proxy = singerProxy.getProxy();
        proxy.perform("\u300a\u591c\u66f2\u300b");
    }
}<\/p>

 <\/p>

\u8f93\u51fa\uff1a<\/p>

\"\"<\/p>

 \u4e8c\uff1a\u52a8\u6001\u4ee3\u7406\u7684\u5185\u90e8\u63a2\u7a76<\/p>

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2.1:\u627e\u5230\u751f\u6210\u7684\u4ee3\u7406\u7c7b<\/p>

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System.setProperty("sun.misc.ProxyGenerator.saveGeneratedFiles","true");<\/p>

2.2:singerProxy\u7c7b<\/p>

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