效果图：
代码：
package com.jxc.util;
import java.io.File;
import java.io.FileWriter;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.persistence.Column;
import javax.persistence.JoinColumn;
import javax.persistence.Table;
public class TableFieldHelper {
/**
* @param args
* @throws ClassNotFoundException
* @throws IllegalAccessException
* @throws InstantiationException
*/
public static void main(String[] args) throws Exception {
String path="C:\\work\\jxc\\target\\jxc-0.0.1-SNAPSHOT\\WEB-INF\\classes\\com\\jxc\\model\\po";
List<File> files=files(path);
StringBuilder sb=new StringBuilder();
sb.append("<!DOCTYPE HTML><html><head>数据字典</head><meta content=\"text/html;charset=utf-8\" http-equiv=\"content-type\"></meta><body>");
sb.append("<style>table{border-collapse:collapse;} table td{border:#CCC 1px solid;padding:5px;}</style>");
Integer count=0;
for (File file : files) {
String className="com.jxc.model.po."+file.getName().replace(".class", "");
Class class1=Class.forName(className);
if(class1.getModifiers()!=1025){
Object object=class1.newInstance();
sb.append(createTable(object)+"<div style=‘height:1px;border-bootom:#CCC 1px solid;margin:10px 0px;‘></div>");
}
count++;
}
sb.append("<div>表总数："+count+"</div>");
sb.append("<div>创建时间："+new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss").format(new Date())+"</div>");
sb.append("</body></html>");
FileWriter fw = new FileWriter("c:\\table.html");
fw.write(sb.toString(), 0, sb.toString().length());
fw.flush();
fw.close();
}
public static String createTable(Object object) throws Exception{
StringBuilder sb=new StringBuilder();
Method[] methods=object.getClass().getDeclaredMethods();
Table table=object.getClass().getAnnotation(Table.class);
if(table!=null){
sb.append("<table>");
sb.append("<tr>");
sb.append("<td colspan=‘5‘ style=‘text-align: center;‘>"+"<a href=‘javascript:void();‘ name=‘"+object.getClass().getName()+"‘>"+object.getClass().getName()+"</a> = "+table.name().toLowerCase()+"</td>");
sb.append("</tr>");
sb.append("<tr>");
sb.append("<td>数据库字段</td>");
sb.append("<td>类字段</td>");
sb.append("<td>类型</td>");
sb.append("<td>外键表</td>");
sb.append("<td>外键类</td>");
sb.append("</tr>");
}
System.out.println(object.getClass().getName());
for (Method method : methods) {
//根据方法获取字段类型
String field=method.getName().substring("get".length());
field=field.substring(0,1).toLowerCase()+field.substring(1);
Column column=method.getAnnotation(Column.class);
if(column!=null){
sb.append("<tr>");
String fieldName=column.name();
Field field2=getField(field,object);
String type="";
if(field2!=null){
field2.setAccessible(true);
type=field2.getType().getSimpleName();
//外键
}
sb.append("<td>"+fieldName+"</td>");
sb.append("<td>"+field+"</td>");
sb.append("<td>"+type+"</td>");
sb.append("<td> </td>");
sb.append("<td> </td>");
sb.append("</tr>");
}
JoinColumn joinColumn=method.getAnnotation(JoinColumn.class);
if(joinColumn!=null){
Class class1=Class.forName(method.getReturnType().getName());
Table table2=class1.newInstance().getClass().getAnnotation(Table.class);
if(table2!=null){
sb.append("<tr>");
sb.append("<td>"+joinColumn.name()+"</td>");
sb.append("<td>"+field+"</td>");
Field field2=getField(method.getName().substring("get".length()),object);
if(field2!=null){
sb.append("<td>"+field2.getType().getSimpleName()+"</td>");
}
sb.append("<td>"+table2.name()+"</td>");
sb.append("<td><a href=‘#"+method.getReturnType().getName()+"‘>"+method.getReturnType().getName()+"</a></td>");
sb.append("</tr>");
}
}
}
sb.append("</table>");
return sb.toString();
}
public static Field getField(String key,Object object) throws Exception{
Field[] fields=object.getClass().getDeclaredFields();
for (Field field : fields) {
if(field.getName().toLowerCase().equals(key.toLowerCase())){
return field;
}
}
return null;
}
public static List<File> files(String path){
List<File> files=new ArrayList<File>();
File file=new File(path);
File[] listFiles=file.listFiles();
for (File file2 : listFiles) {
if(file2.isFile()){
files.add(file2);
}else {
files.addAll(files(file2.getPath()));
}
}
return files;
}
}
只能是注解配置的对象才会生效！