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java實(shí)現(xiàn)代碼生成 java實(shí)現(xiàn)代碼生成器

Java動(dòng)態(tài)生成代碼

可以的,我說(shuō)說(shuō)大概思路,很簡(jiǎn)單,你自己具體實(shí)現(xiàn)吧,把代碼寫(xiě)給你沒(méi)意義的:

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1.將你這段字符串輸出到一個(gè)文件里,用Java類(lèi)文件的方式命名。

2.調(diào)用外部javac命令將該文件編譯。

3.用類(lèi)加載器(ClassLoad)動(dòng)態(tài)加載新的class文件并用Class.forName()注冊(cè)該類(lèi),然后就可以正常使用了。

上面的每一步都能在baidu中找到實(shí)現(xiàn)方法,自己發(fā)揮吧。

java代碼生成器怎么用

zip包,然后自動(dòng)下載下來(lái)

1.預(yù)先定義好模板

2.界面輸入相關(guān)參數(shù)

3.解析模板生成代碼并下載

最后放出源代碼:

package com.et.controller.system.createcode;

import java.util.ArrayList;

import java.util.Date;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import com.et.controller.base.BaseController;

import com.et.util.DelAllFile;

import com.et.util.FileDownload;

import com.et.util.FileZip;

import com.et.util.Freemarker;

import com.et.util.PageData;

import com.et.util.PathUtil;

/**

* 類(lèi)名稱(chēng):FreemarkerController

* 創(chuàng)建人:Harries

* 創(chuàng)建時(shí)間:2015年1月12日

* @version

*/

@Controller

@RequestMapping(value=”/createCode”)

public class CreateCodeController extends BaseController {

/**

* 生成代碼

*/

@RequestMapping(value=”/proCode”)

public void proCode(HttpServletResponse response) throws Exception{

PageData pd = new PageData();

pd = this.getPageData();

/* ============================================================================================= */

String packageName = pd.getString(“packageName”); //包名 ========1

String objectName = pd.getString(“objectName”); //類(lèi)名 ========2

String tabletop = pd.getString(“tabletop”); //表前綴 ========3

tabletop = null == tabletop?””:tabletop.toUpperCase(); //表前綴轉(zhuǎn)大寫(xiě)

String zindext = pd.getString(“zindex”); //屬性總數(shù)

int zindex = 0;

if(null != zindext !””.equals(zindext)){

zindex = Integer.parseInt(zindext);

}

ListString[] fieldList = new ArrayListString[](); //屬性集合 ========4

for(int i=0; i zindex; i++){

fieldList.add(pd.getString(“field”+i).split(“,fh,”)); //屬性放到集合里面

}

MapString,Object root = new HashMapString,Object(); //創(chuàng)建數(shù)據(jù)模型

root.put(“fieldList”, fieldList);

root.put(“packageName”, packageName); //包名

root.put(“objectName”, objectName); //類(lèi)名

root.put(“objectNameLower”, objectName.toLowerCase()); //類(lèi)名(全小寫(xiě))

root.put(“objectNameUpper”, objectName.toUpperCase()); //類(lèi)名(全大寫(xiě))

root.put(“tabletop”, tabletop); //表前綴

root.put(“nowDate”, new Date()); //當(dāng)前日期

DelAllFile.delFolder(PathUtil.getClasspath()+”admin/ftl”); //生成代碼前,先清空之前生成的代碼

/* ============================================================================================= */

String filePath = “admin/ftl/code/”; //存放路徑

String ftlPath = “createCode”; //ftl路徑

/*生成controller*/

Freemarker.printFile(“controllerTemplate.ftl”, root, “controller/”+packageName+”/”+objectName.toLowerCase()+”/”+objectName+”Controller.java”, filePath, ftlPath);

/*生成service*/

Freemarker.printFile(“serviceTemplate.ftl”, root, “service/”+packageName+”/”+objectName.toLowerCase()+”/”+objectName+”Service.java”, filePath, ftlPath);

/*生成mybatis xml*/

Freemarker.printFile(“mapperMysqlTemplate.ftl”, root, “mybatis_mysql/”+packageName+”/”+objectName+”Mapper.xml”, filePath, ftlPath);

Freemarker.printFile(“mapperOracleTemplate.ftl”, root, “mybatis_oracle/”+packageName+”/”+objectName+”Mapper.xml”, filePath, ftlPath);

/*生成SQL腳本*/

Freemarker.printFile(“mysql_SQL_Template.ftl”, root, “mysql數(shù)據(jù)庫(kù)腳本/”+tabletop+objectName.toUpperCase()+”.sql”, filePath, ftlPath);

Freemarker.printFile(“oracle_SQL_Template.ftl”, root, “oracle數(shù)據(jù)庫(kù)腳本/”+tabletop+objectName.toUpperCase()+”.sql”, filePath, ftlPath);

/*生成jsp頁(yè)面*/

Freemarker.printFile(“jsp_list_Template.ftl”, root, “jsp/”+packageName+”/”+objectName.toLowerCase()+”/”+objectName.toLowerCase()+”_list.jsp”, filePath, ftlPath);

Freemarker.printFile(“jsp_edit_Template.ftl”, root, “jsp/”+packageName+”/”+objectName.toLowerCase()+”/”+objectName.toLowerCase()+”_edit.jsp”, filePath, ftlPath);

/*生成說(shuō)明文檔*/

Freemarker.printFile(“docTemplate.ftl”, root, “說(shuō)明.doc”, filePath, ftlPath);

//this.print(“oracle_SQL_Template.ftl”, root); 控制臺(tái)打印

/*生成的全部代碼壓縮成zip文件*/

FileZip.zip(PathUtil.getClasspath()+”admin/ftl/code”, PathUtil.getClasspath()+”admin/ftl/code.zip”);

/*下載代碼*/

FileDownload.fileDownload(response, PathUtil.getClasspath()+”admin/ftl/code.zip”, “code.zip”);

}

}

如何用Java代碼段生成四位數(shù)字加字母的驗(yàn)證碼?

不知道你問(wèn)的是不是生成這種圖片驗(yàn)證碼?如果只要一個(gè)隨機(jī)四位數(shù) 那這行代碼就夠了(new Random().nextInt(9000) + 1000;),如果是生成頁(yè)面圖片驗(yàn)證碼就是下面的了: //設(shè)定 響應(yīng)模式 resp.setContentType("image/jpeg"); // 生成令牌環(huán)數(shù)據(jù); Integer token = new Random().nextInt(9000) + 1000; // 保存令牌環(huán)數(shù)據(jù)到session中 req.getSession().setAttribute(IMAGE_TOKEN_NAME, token); // 生成令牌環(huán)圖片 ServletOutputStream out = resp.getOutputStream(); BufferedImage img = new BufferedImage(60, 20, BufferedImage.TYPE_INT_RGB); Graphics g = img.getGraphics(); g.setColor(Color.YELLOW); g.fillRect(0, 0, img.getWidth(), img.getHeight()); g.setColor(Color.BLUE); g.setFont(new Font("", Font.BOLD, 18)); g.drawString(String.valueOf(token), 10, 16); ImageIO.write(img, "jpg", out); out.close();

下面簡(jiǎn)單的介紹他們的功能和用途,執(zhí)行效率等。每個(gè)都有各自的優(yōu)缺點(diǎn)看你是做甚什么方面的研究開(kāi)發(fā)用。.net,是網(wǎng)站編程,現(xiàn)在很多都用這個(gè),但是這個(gè)語(yǔ)言編程都有統(tǒng)一思路,很好掌握。窒息那個(gè)效率不是很高;php 支持跨平臺(tái),很容易學(xué)會(huì),執(zhí)行的效率很高;asp是ASP.net的前身,它比較穩(wěn)定,比.net要弱一點(diǎn)。但是比.net好學(xué)。jsp 是網(wǎng)頁(yè)編程,這個(gè)學(xué)習(xí)大約一周就能搞定,不過(guò)這個(gè)得多實(shí)踐,不然的話(huà),時(shí)間長(zhǎng)了,就容易忘記。

我自己做的系統(tǒng)里面用作驗(yàn)證碼的JSP的%@page contentType="image/jpeg;charset=utf-8"%%@page import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*" %%@ page import="java.io.OutputStream" %html body %! Color getRandColor(int fc,int bc) { Random rd=new Random(); if(fc255) fc=255; if(bc255) bc=255; int red=fc+rd.nextInt(bc-fc); int green=fc+rd.nextInt(bc-fc); int blue=fc+rd.nextInt(bc-fc); return new Color(red,green,blue); } % % Random r=new Random(); response.addHeader("Pragma","No-cache"); response.addHeader("Cache-Control","no-cache"); response.addDateHeader("expires",0); int width=90; int height=23; BufferedImage pic=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics gc=pic.getGraphics(); gc.setColor(getRandColor(200,250)); gc.fillRect(0,0,width,height); String[] rNum ={"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f", "g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w", "x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N", "O","P","Q","R","S","T","U","V","W","X","Y","Z"}; int[] style = {Font.PLAIN,Font.BOLD,Font.ITALIC,Font.PLAIN+Font.BOLD, Font.BOLD+Font.ITALIC,Font.PLAIN+Font.ITALIC,Font.PLAIN+Font.BOLD+Font.ITALIC}; gc.setColor(Color.WHITE); gc.drawLine(0,30,90,10); gc.setColor(getRandColor(160,200)); for (int i=0;i50;i++) { int x = r.nextInt(width); int y = r.nextInt(height); int xl = r.nextInt(10); int yl = r.nextInt(10); gc.drawLine(x,y,x+xl,y+yl); } gc.setColor(getRandColor(60,150)); String rt = ""; for(int i=0;i4;i++){ String temp = rNum[r.nextInt(62)]; rt = rt+temp; gc.setFont(new Font("Times New Roman",style[r.nextInt(7)],15)); gc.drawString(temp,5+i*15+r.nextInt(10),10+r.nextInt(10)); } gc.dispose(); session.setAttribute("randNum",rt); OutputStream os=response.getOutputStream(); ImageIO.write(pic,"JPEG",os); System.out.println("當(dāng)前驗(yàn)證碼為:"+session.getAttribute("randNum")); os.flush(); os.close(); os=null; response.flushBuffer(); out.clear(); out = pageContext.pushBody(); % /body/html

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