Java uses reflection to automatically encapsulate entity objects

The example in this article describes how Java uses reflection to automatically encapsulate entity objects. Share it with everyone for your reference. The specific analysis is as follows:

When using this method, the name of the parameter that needs to be passed must end with a row number. If the row number is removed, it is the attribute name. For example, if the page passes name+rowNo, then the attribute name of the entity object should be name. The code is as follows. Copy the code. The code is as follows: // Get page data and automatically encapsulate it into a bean object.
public List getObjectList(Class clazz,String[] rowNos) throws Exception{
List objList = new ArrayList();
for(int i=0;rowNos!=null && i<rowNos.length;i++){
//Create object instance
Object object = clazz.newInstance();
//Get the attributes declared by the class
Field[] fields = clazz.getDeclaredFields();

StringBuffer buffer = null;
//Traverse properties and perform encapsulation
for(int j=0;j<fields.length;j++){
//Get the name of the attribute
String fieldName = fields[j].getName();
//Get the name of the parameter
String paraName = fields[j].getName()+rowNos[i];

//If the obtained parameter value is empty, continue the loop
String value = getValueNull(paraName);
if(value==null){
continue;
}

//Parameter value
Object[] paramValue =new Object[1];
if(fields[j].getType().toString().equals("class java.lang.String")){
paramValue[0]=value;
}
if(fields[j].getType().toString().equals("class java.lang.Integer")){
paramValue[0]=new Integer(value);
}
if(fields[j].getType().toString().equals("class java.lang.Double")){
paramValue[0]=new Double(value);
}
if(fields[j].getType().toString().equals("class java.util.Date")){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
paramValue[0]=sdf.parse(value);
}

//Parameter type
Class[] paramType= {fields[j].getType()};

//Get the name of the set method
buffer = new StringBuffer("set");
buffer.append(fieldName.substring(0, 1).toUpperCase());
buffer.append(fieldName.substring(1));
//Get and put back
Method method = clazz.getDeclaredMethod(buffer.toString(), paramType);
//execution method
method.invoke(object,paramValue);
}
//Put the current object into the list
objList.add(object);
}
return objList;
}

I hope this article will be helpful to everyone’s Java programming.