自定义动态生成Model以及数据格式处理代码精细
package org.fanzone.util;
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import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
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/**?
?* Title: Touch<br>?
?* Description: Base Handler Utilities<br>?
?* Copyright: Copyright (c) 2011 <br>?
?* Create DateTime: Jun 2, 2011 2:40:20 PM <br>?
?* @author wangmeng
?*/
public class SenchaUtil {
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/**
?* Appending object via string.
?* @param object
?* @return java.lang.String
?*/
public static String objectToJson(Object object) {
StringBuilder json = new StringBuilder();
if (object == null) {
json.append("""");
}else if (object instanceof String ) {
json.append(""").append((String)object).append(""");
}else if (object instanceof Long){
json.append(""").append((Long)object).append(""");
}else if (object instanceof Integer){
json.append(""").append((Integer)object).append(""");
}else if (object instanceof Double){
json.append(""").append((Double)object).append(""");
}else if (object instanceof Float){
json.append(""").append((Float)object).append(""");
}else if (object instanceof Short){
json.append(""").append((Short)object).append(""");
}else if (object instanceof Character){
json.append(""").append((Character)object).append(""");
}else if (object instanceof Character){
json.append(""").append((Character)object).append(""");
}else {
json.append(beanToJson(object));
}
return json.toString();
}
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/**
?* Formating attributes.
?* @param bean
?* @return String
?*/
public static String beanToJson(Object bean) {
StringBuilder json = new StringBuilder();
json.append("{");
PropertyDescriptor[] props = null;
try {
props = Introspector.getBeanInfo(bean.getClass(), Object.class).getPropertyDescriptors();
} catch (IntrospectionException e) {
}
if (props != null) {
for (int i = 0; i < props.length; i++) {
try {
String name = objectToJson(props[i].getName());
String value = objectToJson(props[i].getReadMethod().invoke(bean));
json.append(name);
json.append(":");
json.append(value);
json.append(",");
} catch (Exception e) {
}
}
json.setCharAt(json.length() - 1, '}');
} else {
json.append("}");
}
return json.toString();
}
/**
?* Make List to JSON formated.
?* @param list
?* @return java.lang.String
?*/
public static String listToJson(List<?> list) {
StringBuilder json = new StringBuilder();
json.append("{"+'"'+list.get(0).getClass().getSimpleName()+'"'+":[");
if((list != null) && (list.size() > 0)) {
for(Object obj : list){
json.append(objectToJson(obj));
json.append(",");
}
json.setCharAt(json.length()-1, ']');
}else {
json.append("]");
}
json.append("}");
return json.toString();
}
/**
?* Make Set to JSON formated.
?* @param list
?* @return java.lang.String
?*/
public static String setToJson(Set<?> set){
StringBuilder json = new StringBuilder();
Iterator<?> itr = set.iterator();
if(itr.hasNext()){
json.append("{"+'"'+itr.next().getClass().getSimpleName()+'"'+":[");
}
if(set != null && set.size() > 0){
for(Object obj : set){
json.append(objectToJson(obj));
json.append(",");
}
json.setCharAt(json.length()-1, ']');
}else{
json.append("]");
}
json.append("}");
return json.toString();
}
/**
?* To build model in dynamic.
?* @param className
?* @return model string
?*/
public static StringBuilder buildModel(String className){
StringBuilder builder = new StringBuilder();
Class<?> c;
PropertyDescriptor[] props = null;
try {
c = Class.forName(className);
builder.append("Ext.regModel('"+c.getSimpleName()+"', {");
builder.append("fields: [");
props = Introspector.getBeanInfo(c, Object.class).getPropertyDescriptors();
if (props != null) {
for (int i = 0; i < props.length; i++) {
String name = props[i].getName();
String type = props[i].getReadMethod().toString();
type = type.substring(type.indexOf(" ")+1, type.lastIndexOf(" "));
type = type.substring(type.lastIndexOf(".")+1,type.length());
builder.append("{name: '"+name+"', type: '"+type.toLowerCase()+"'},");
}
builder.replace(builder.length()-1, builder.length(), "");
}
builder.append("]");
builder.append("});");
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
} catch (IntrospectionException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
}
return builder;
}
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/**
?* To fetch all the entities under the specified package.
?* @param pack
?* @return entity list
?*/
public static List<String> entities(String pack){
List<String> entities = new ArrayList<String>();
String classes = System.getProperty("java.class.path");
String dir = classes.substring(0,classes.indexOf(";"));
String path = dir + '\\' + pack.replace('.', '\\');
File file = new File(path);
if(file.exists()){
if(file.isDirectory()){
File[] files = file.listFiles();
for(File f : files){
entities.add(pack+'.'+f.getName().substring(0,f.getName().indexOf(".")));
}
}
}
return entities;
}
/**
?* Build models with the specified package.
?* @param pack
?* @return all models string.
?*/
public static StringBuilder buildModels(String pack){
StringBuilder builder = new StringBuilder();
for(String entity : entities(pack)){
builder.append(buildModel(entity));
builder.append("\r\n");
}
return builder;
}
/**
?* Test Main
?* @param args
?*/
public static void main(String[] args) {
System.out.println(buildModels("org.mars.entity"));
}
}
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