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<span class="link_title"><a href="/ichsonx/article/details/9108173">
通过Java反射调用方法
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<span class="link_postdate">2013-06-16 21:19</span>
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<div><strong><a href="http://lavasoft.blog.51cto.com/62575/61002/">传送么:http://lavasoft.blog.51cto.com/62575/61002/</a></strong><br>
这是个测试用的例子，通过反射调用对象的方法。</div>
<div> </div>
<div> </div>
<div>TestRef.java</div>
<div>
<div style="border-right:#cccccc 1px solid; padding-right:4px; border-top:#cccccc 1px solid; padding-left:4px; font-size:10pt; padding-bottom:4px; border-left:#cccccc 1px solid; width:98%; color:#000000; word-break:break-all; line-height:16px; padding-top:4px; border-bottom:#cccccc 1px solid; font-family:verdana,宋体; background-color:#eeeeee">
<span style="color:#0000ff">import</span> java.lang.reflect.Method; <br>
<span style="color:#0000ff">import</span> java.lang.reflect.InvocationTargetException;<br>
<br>
<span style="color:#008000">/** <br>
* Created by IntelliJ IDEA. <br>
* File: TestRef.java <br>
* User: leizhimin <br>
* Date: 2008-1-28 14:48:44 <br>
*/</span> <br>
<span style="color:#0000ff">public</span> <span style="color:#0000ff">class</span> TestRef {<br>
<br>
<span style="color:#0000ff">public</span> <span style="color:#0000ff">static</span><span style="color:#0000ff">void</span> main(String args[])
<span style="color:#0000ff">throws</span> NoSuchMethodException, IllegalAccessException, InvocationTargetException {<br>
Foo foo = <span style="color:#0000ff">new</span> Foo(<span style="color:#800000">"这个一个Foo对象！"</span>);<br>
Class clazz = foo.getClass(); <br>
Method m1 = clazz.getDeclaredMethod(<span style="color:#800000">"outInfo"</span>);<br>
Method m2 = clazz.getDeclaredMethod(<span style="color:#800000">"setMsg"</span>, String.<span style="color:#0000ff">class</span>);<br>
Method m3 = clazz.getDeclaredMethod(<span style="color:#800000">"getMsg"</span>);<br>
m1.invoke(foo); <br>
m2.invoke(foo, <span style="color:#800000">"重新设置msg信息！"</span>); <br>
String msg = (String) m3.invoke(foo); <br>
System.out.println(msg); <br>
} <br>
} <br>
<br>
<span style="color:#0000ff">class</span> Foo { <br>
<span style="color:#0000ff">private</span> String msg; <br>
<br>
<span style="color:#0000ff">public</span> Foo(String msg) { <br>
<span style="color:#0000ff">this</span>.msg = msg; <br>
} <br>
<br>
<span style="color:#0000ff">public</span> <span style="color:#0000ff">void</span> setMsg(String msg) {<br>
<span style="color:#0000ff">this</span>.msg = msg; <br>
} <br>
<br>
<span style="color:#0000ff">public</span> String getMsg() { <br>
<span style="color:#0000ff">return</span> msg; <br>
} <br>
<br>
<span style="color:#0000ff">public</span> <span style="color:#0000ff">void</span> outInfo() {<br>
System.out.println(<span style="color:#800000">"这是测试Java反射的测试类"</span>); <br>
} <br>
}</div>
</div>
<div> </div>
<div>控制台输出结果：</div>
<div>
<div style="border-right:#cccccc 1px solid; padding-right:4px; border-top:#cccccc 1px solid; padding-left:4px; font-size:10pt; padding-bottom:4px; border-left:#cccccc 1px solid; width:98%; color:#000000; word-break:break-all; line-height:16px; padding-top:4px; border-bottom:#cccccc 1px solid; font-family:verdana,宋体; background-color:#eeeeee">
这是测试Java反射的测试类 <br>
重新设置msg信息！ <br>
<br>
Process finished with exit code 0 <br>
<br>
<br>
</div>
</div>
<div> <br>
<br>
<br>
<br>
<strong><a href="http://blog.youkuaiyun.com/hbcui1984/article/details/2719089">传送门:http://blog.youkuaiyun.com/hbcui1984/article/details/2719089</a></strong><br>
<br>
<span style="font-family:宋体; font-size:14pt"><strong style="font-size:16pt">JAVA反射使用手</strong>记</span>
<p> 本篇文章为在工作中使用JAVA反射的经验总结，也可以说是一些小技巧，以后学会新的小技巧，会不断更新。本文不准备讨论JAVA反射的机制，网上有很多，大家随便google一下就可以了。</p>
<p> 在开始之前，我先定义一个测试类Student，代码如下：</p>
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<ol class="dp-j" start="1">
<li class="alt"><span><span class="keyword">package</span><span> chb.test.reflect; </span></span></li><li><span> </span></li><li class="alt"><span><span class="keyword">public</span><span> </span><span class="keyword">class</span><span> Student { </span></span></li><li><span> <span class="keyword">private</span><span> </span><span class="keyword">int</span><span> age; </span></span></li><li class="alt"><span> <span class="keyword">private</span><span> String name; </span></span></li><li><span> <span class="keyword">public</span><span> </span><span class="keyword">int</span><span> getAge() { </span></span></li><li class="alt"><span> <span class="keyword">return</span><span> age; </span></span></li><li><span> } </span></li><li class="alt"><span> <span class="keyword">public</span><span> </span><span class="keyword">void</span><span> setAge(</span><span class="keyword">int</span><span> age) { </span></span></li><li><span> <span class="keyword">this</span><span>.age = age; </span></span></li><li class="alt"><span> } </span></li><li><span> <span class="keyword">public</span><span> String getName() { </span></span></li><li class="alt"><span> <span class="keyword">return</span><span> name; </span></span></li><li><span> } </span></li><li class="alt"><span> <span class="keyword">public</span><span> </span><span class="keyword">void</span><span> setName(String name) { </span></span></li><li><span> <span class="keyword">this</span><span>.name = name; </span></span></li><li class="alt"><span> } </span></li><li><span> </span></li><li class="alt"><span> <span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">void</span><span> hi(</span><span class="keyword">int</span><span> age,String name){ </span></span></li><li><span> System.out.println(<span class="string">"大家好，我叫"</span><span>+name+</span><span class="string">"，今年"</span><span>+age+</span><span class="string">"岁"</span><span>); </span></span></li><li class="alt"><span> } </span></li><li><span>}<pre></pre> </span></li></ol>
</div>
<p><strong>一、JAVA反射的常规使用步骤</strong></p>
<p dir="ltr" style="margin-right:0px"> 反射调用一般分为3个步骤：</p>
<ul dir="ltr">
<li>
<div style="margin-right:0px">得到要调用类的class</div>
</li><li>
<div style="margin-right:0px">得到要调用的类中的方法(Method)</div>
</li><li>
<div style="margin-right:0px">方法调用(invoke)</div>
</li></ul>
<p dir="ltr" style="margin-right:0px"> 代码示例：</p>
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<ol class="dp-c" start="1">
<li class="alt"><span><span>Class cls = Class.forName(</span><span class="string">"chb.test.reflect.Student"</span><span>); </span></span></li><li><span>Method m = cls.getDeclaredMethod(<span class="string">"hi"</span><span>,</span><span class="keyword">new</span><span> Class[]{</span><span class="keyword">int</span><span>.</span><span class="keyword">class</span><span>,String.</span><span class="keyword">class</span><span>}); </span></span></li><li class="alt"><span>m.invoke(cls.newInstance(),20,<span class="string">"chb"</span><span>);<pre></pre> </span></span></li></ol>
</div>
<p><strong>二、方法调用中的参数类型</strong></p>
<p> 在方法调用中，参数类型必须正确，这里需要注意的是不能使用包装类替换基本类型，比如不能使用Integer.class代替int.class。</p>
<p> 如我要调用Student的setAge方法，下面的调用是正确的：</p>
<p> </p>
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<ol class="dp-j" start="1">
<li class="alt"><span><span>Class cls = Class.forName(</span><span class="string">"chb.test.reflect.Student"</span><span>); </span></span></li><li><span>Method setMethod = cls.getDeclaredMethod(<span class="string">"setAge"</span><span>,</span><span class="keyword">int</span><span>.</span><span class="keyword">class</span><span>); </span></span></li><li class="alt"><span>setMethod.invoke(cls.newInstance(), <span class="number">15</span><span>);<pre></pre> </span></span></li></ol>
</div>
<p> </p>
<p> 而如果我们用Integer.class替代int.class就会出错，如：</p>
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<li class="alt"><span><span>Class cls = Class.forName(</span><span class="string">"chb.test.reflect.Student"</span><span>); </span></span></li><li><span>Method setMethod = cls.getDeclaredMethod(<span class="string">"setAge"</span><span>,Integer.</span><span class="keyword">class</span><span>); </span></span></li><li class="alt"><span>setMethod.invoke(cls.newInstance(), <span class="number">15</span><span>);<pre></pre> </span></span></li></ol>
</div>
<p> </p>
<p> jvm会报出如下异常：</p>
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<ol class="dp-xml" start="1">
<li class="alt"><span><span>java.lang.NoSuchMethodException: chb.test.reflect.Student.setAge(java.lang.Integer) </span></span></li><li><span> at java.lang.Class.getDeclaredMethod(Unknown Source) </span></li><li class="alt"><span> at chb.test.reflect.TestClass.testReflect(TestClass.java:23)<span class="tag"><</span><span class="tag-name">pre</span><span class="tag">></span><span class="tag"></</span><span class="tag-name">pre</span><span class="tag">></span><span> </span></span></li></ol>
</div>
<p> </p>
<p><strong>三、static方法的反射调用</strong></p>
<p> </p>
<p> static方法调用时，不必得到对象示例，如下：</p>
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</div>
<ol class="dp-j" start="1">
<li class="alt"><span><span>Class cls = Class.forName(</span><span class="string">"chb.test.reflect.Student"</span><span>); </span></span></li><li><span>Method staticMethod = cls.getDeclaredMethod(<span class="string">"hi"</span><span>,</span><span class="keyword">int</span><span>.</span><span class="keyword">class</span><span>,String.</span><span class="keyword">class</span><span>); </span></span></li><li class="alt"><span>staticMethod.invoke(cls,<span class="number">20</span><span>,</span><span class="string">"chb"</span><span>);</span><span class="comment">//这里不需要newInstance</span><span> </span></span></li><li><span><span class="comment">//staticMethod.invoke(cls.newInstance(),20,"chb");<pre></pre></span><span> </span></span></li></ol>
</div>
<p><strong>四、private的成员变量赋值</strong></p>
<p> 如果直接通过反射给类的private成员变量赋值，是不允许的，这时我们可以通过setAccessible方法解决。代码示例：</p>
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<ol class="dp-j" start="1">
<li class="alt"><span><span>Class cls = Class.forName(</span><span class="string">"chb.test.reflect.Student"</span><span>); </span></span></li><li><span>Object student = cls.newInstance();<span class="comment">//得到一个实例</span><span> </span></span></li><li class="alt"><span>Field field = cls.getDeclaredField(<span class="string">"age"</span><span>); </span></span></li><li><span>field.set(student, <span class="number">10</span><span>); </span></span></li><li class="alt"><span>System.out.println(field.get(student));<pre></pre> </span></li></ol>
</div>
<p> </p>
<p> 运行如上代码，系统会报出如下异常：</p>
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<ol class="dp-xml" start="1">
<li class="alt"><span><span>java.lang.IllegalAccessException: Class chb.test.reflect.TestClass can not access a member of class chb.test.reflect.Student with modifiers "private" </span></span></li><li><span> at sun.reflect.Reflection.ensureMemberAccess(Unknown Source) </span></li><li class="alt"><span> at java.lang.reflect.Field.doSecurityCheck(Unknown Source) </span></li><li><span> at java.lang.reflect.Field.getFieldAccessor(Unknown Source) </span></li><li class="alt"><span> at java.lang.reflect.Field.set(Unknown Source) </span></li><li><span> at chb.test.reflect.TestClass.testReflect(TestClass.java:20)<span class="tag"><</span><span class="tag-name">pre</span><span class="tag">></span><span class="tag"></</span><span class="tag-name">pre</span><span class="tag">></span><span> </span></span></li></ol>
</div>
<p> 解决方法：</p>
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<ol class="dp-j" start="1">
<li class="alt"><span><span>Class cls = Class.forName(</span><span class="string">"chb.test.reflect.Student"</span><span>); </span></span></li><li><span>Object student = cls.newInstance(); </span></li><li class="alt"><span>Field field = cls.getDeclaredField(<span class="string">"age"</span><span>); </span></span></li><li><span>field.setAccessible(<span class="keyword">true</span><span>);</span><span class="comment">//设置允许访问</span><span> </span></span></li><li class="alt"><span>field.set(student, <span class="number">10</span><span>); </span></span></li><li><span>System.out.println(field.get(student));<pre></pre> </span></li></ol>
</div>
<p> 其实，在某些场合下(类中有get,set方法)，可以先反射调用set方法，再反射调用get方法达到如上效果，代码示例：</p>
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<ol class="dp-j" start="1">
<li class="alt"><span><span>Class cls = Class.forName(</span><span class="string">"chb.test.reflect.Student"</span><span>); </span></span></li><li><span>Object student = cls.newInstance(); </span></li><li class="alt"><span> </span></li><li><span>Method setMethod = cls.getDeclaredMethod(<span class="string">"setAge"</span><span>,Integer.</span><span class="keyword">class</span><span>); </span></span></li><li class="alt"><span>setMethod.invoke(student, <span class="number">15</span><span>);</span><span class="comment">//调用set方法</span><span> </span></span></li><li><span> </span></li><li class="alt"><span>Method getMethod = cls.getDeclaredMethod(<span class="string">"getAge"</span><span>); </span></span></li><li><span>System.out.println(getMethod.invoke(student));<span class="comment">//再调用get方法<pre></pre></span><span>
<br>
</span></span></li></ol>
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<p style="margin:0px;"><a href="/u013795543" class="user_name">u013795543</a>:
学习了
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<a href="/ichsonx/article/details/39008519#comments">Dubbo是什么</a>
<p style="margin:0px;"><a href="/u012323351" class="user_name">u012323351</a>:
初学者很好的教程谢谢楼主分享
</p>
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<li>
<a href="/ichsonx/article/details/39008519#comments">Dubbo是什么</a>
<p style="margin:0px;"><a href="/u013047584" class="user_name">u013047584</a>:
不错，宏观留一遍。
</p>
</li>
<li>
<a href="/ichsonx/article/details/39008519#comments">Dubbo是什么</a>
<p style="margin:0px;"><a href="/u013046597" class="user_name">u013046597</a>:
很好
</p>
</li>
<li>
<a href="/ichsonx/article/details/39008519#comments">Dubbo是什么</a>
<p style="margin:0px;"><a href="/qqxyy99" class="user_name">qqxyy99</a>:
敏捷测试团队，不再仅仅是在coding之后。而是和研发人员贯穿在需求分析、规格说明、自动化单元测试、...
</p>
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<a href="/ichsonx/article/details/40385737#comments">让Ubuntu 14.04“保存”屏幕亮度值</a>
<p style="margin:0px;"><a href="/dingmlp" class="user_name">dingmlp</a>:
@ichsonx:1）在exit 0 前面添加设置；2）查看当前设置亮度：sudo cat /sys...
</p>
</li>
<li>
<a href="/ichsonx/article/details/6667947#comments">Omni-NFS-X Windows与Linux间通讯的另一种方式</a>
<p style="margin:0px;"><a href="/YIDI520206" class="user_name">YIDI520206</a>:
有人能成功吗？一直连不上用这个
</p>
</li>
<li>
<a href="/ichsonx/article/details/7699093#comments">ContextLoaderListener与DispatcherServlet所加载的applicationContext的区别</a>
<p style="margin:0px;"><a href="/xyjincan" class="user_name">xyjincan</a>:
upup
</p>
</li>
<li>
<a href="/ichsonx/article/details/2954397#comments">struts2核心工作流程与原理</a>
<p style="margin:0px;"><a href="/cd18333612683" class="user_name">cd18333612683</a>:
学习了，最近正在学习有关知识
</p>
</li>
<li>
<a href="/ichsonx/article/details/2954397#comments">Dubbo是什么</a>
<p style="margin:0px;"><a href="/chq00788" class="user_name">chq00788</a>:
不错，简单易懂，感谢楼主，学习了
</p>
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