1 /**
 2  * 
 3  * 测试使用javassist生成一个新的类
 4  *
 5  * @author Zhang XiaoDao
 6  *
 7  */
 8 public class Demo01 {
 9     public static void main(String[] args) throws Exception {
10         //获取默认的类池
11         ClassPool pool = ClassPool.getDefault();
12         //需要创建的类
13         CtClass cc = pool.makeClass("com.zzp.bean.Emp");
14         
15         //创建属性,也可以给属性赋值
16         CtField f1 = CtField.make("private int empno", cc);
17         CtField f2 = CtField.make("private String ename", cc);
18         cc.addField(f1);
19         cc.addField(f2);
20         
21         //创建相关的方法
22         //创建set/get方法
23         CtMethod.make("public int getEmpno(){return empno;}", cc);
24         CtMethod.make("public void setEmpno(int empno){this.empno = empno;}", cc);
25         
26         CtMethod m1 = CtMethod.make("public String getEname(){return ename;}", cc);
27         CtMethod m2 = CtMethod.make("public void setEname(String ename){this.ename = ename;}", cc);
28         cc.addMethod(m1);
29         cc.addMethod(m2);
30         
31         //添加构造器
32         CtConstructor constructor = new CtConstructor(new CtClass[]{CtClass.intType,pool.get("java.lang.String")
33         },cc);
34         //设置构造器的方法体，method也能设置方法体
35         constructor.setBody("{this.empno=empno; this.ename=ename;}");
36         cc.addConstructor(constructor);
37         
38         //将上面写好的类生成到桌面
39         cc.writeFile("c:/desktop");
40         System.out.println("生成类成功");
41     }
42 }