我尝试在堆栈溢出和其他站点中搜索。但是,我无法得到答案,这就是我在这里发帖的原因。
我参加了一个豆类“BeanEx”
public class BeanEx {
private String queryCode;
private String itemId;
private int infoId;
public String getQueryCode() {
return queryCode;
}
public void setQueryCode(String queryCode) {
this.queryCode = queryCode;
}
public String getItemId(){
return itemId;
}
public void setItemId(String itemId){
this.itemId = itemId;
}
public int getInfoId() {
return infoId;
}
public void setInfoId(int infoId) {
this.infoId = infoId;
}
}
我的主要方法java文件
BeanEx myClass = new BeanEx();
Class<?> objClass = myClass.getClass();
BeanInfo info = Introspector.getBeanInfo(objClass);
PropertyDescriptor[] props = info.getPropertyDescriptors();
MethodDescriptor[] methodDescriptors = info.getMethodDescriptors();
Map<String, String> beanMap = new HashMap<String, String>();
for (PropertyDescriptor pd : props) {
System.out.println(pd.getName());
System.out.println(pd.getReadMethod().getName());
try {
System.out.println("hihi = " + pd.getWriteMethod().getName());
pd.getWriteMethod().invoke(objClass.newInstance(),
new Object[] { "praee" });
} catch (NullPointerException npe) {
System.out.println("ignoring exception");
}
// return pd.getName();
}
我得到了例外......
class
getClass
ignoring exception
infoId
getInfoId
hihi = setInfoId
java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javaapplication1.RegularExpressionExample.getFieldName(RegularExpressionExample.java:44)
at javaapplication1.RegularExpressionExample.main(RegularExpressionExample.java:23)
可能是什么问题..?