ModelAndView使用方法-一个关于校验码生成的bbossmvc restful示例1

ModelAndView使用方法-一个关于校验码生成的bbossmvc restful示例1

bboss mvc即将伴随bbossgroups 2.1一起发布，这里我们先看一个bboss-mvc 的restful风格的案例：

  1.图形码校验控制器-ImageValidatorController

/*
 *  Copyright 2008 biaoping.yin
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.frameworkset.web.spi.validator;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.frameworkset.util.annotations.Attribute;
import org.frameworkset.util.annotations.AttributeScope;
import org.frameworkset.util.annotations.HandlerMapping;
import org.frameworkset.util.annotations.PathVariable;
import org.frameworkset.util.annotations.RequestMethod;
import org.frameworkset.util.annotations.RequestParam;
import org.frameworkset.web.servlet.ModelAndView;

/**
 * <p>Title: ImageValidatorController.java</p> 
 * <p>Description: </p>
 * <p>bboss workgroup</p>
 * <p>Copyright (c) 2008</p>
 * @Date 2010-11-13
 * @author biaoping.yin
 * @version 1.0
 */
@HandlerMapping("/rest/imagevalidator")
public class ImageValidatorController  {
	//http://localhost:8080/bboss-mvc/rest/imagevalidator/abcefg1234/6
	@HandlerMapping(value="/{codelist}/{codenum}",method={RequestMethod.GET,RequestMethod.POST})
	public void generateImageCode(
								  @PathVariable("codelist") String codelist,
								  @PathVariable("codenum") int codenum,
								  HttpServletRequest request,HttpServletResponse response)
	{
		String codekey  = "imagecodekey";
		HttpSession session = request.getSession(true);
		RandImgCreater rc = new RandImgCreater(response,codenum,codelist);

		String rand = rc.createRandImage();
		session.setAttribute(codekey,rand);

	}
//	http://localhost:8080/bboss-mvc/rest/imagevalidator
	@HandlerMapping(method={RequestMethod.POST,RequestMethod.GET})
	public ModelAndView checkImageCode(@RequestParam(name="imagecode") String imagecode,
			@Attribute(name="imagecodekey",scope=AttributeScope.SESSION_ATTRIBUTE) String oldcode)
	{
		String message = "";
		if(imagecode == null || imagecode.equals(""))
			message = "请输入图片校验码。";
		else if(oldcode == null)
			message = "对不起，你已经提交过了。";
		else if(!imagecode.equals(oldcode))
		{
			message = "校验码有误，请重新输入。";
		}
		else
		{
			message = "ok。";
		}	
			
		ModelAndView view = new ModelAndView("/validate/imagevalidate","message",message);
		return view;

	}
	
	
}

2.生成图形码的组件

/*
 *  Copyright 2008 biaoping.yin
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.frameworkset.web.spi.validator;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;

/**
 * <p>
 * Title: RandImgCreater.java
 * </p>
 * <p>
 * Description:
 * </p>
 * <p>
 * bboss workgroup
 * </p>
 * <p>
 * Copyright (c) 2008
 * </p>
 * 
 * @Date 2010-11-13
 * @author biaoping.yin
 * @version 1.0
 */
public class RandImgCreater {
	private static final String CODE_LIST = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
	private HttpServletResponse response = null;
	private static final int HEIGHT = 20;
	private static final int FONT_NUM = 4;
	private int width = 0;
	private int iNum = 0;
	private String codeList = "";
	private boolean drawBgFlag = false;

	private int rBg = 0;
	private int gBg = 0;
	private int bBg = 0;

	public RandImgCreater(HttpServletResponse response) {
		this.response = response;
		this.width = 13 * FONT_NUM + 12;
		this.iNum = FONT_NUM;
		this.codeList = CODE_LIST;
	}

	public RandImgCreater(HttpServletResponse response, int iNum,
			String codeList) {
		this.response = response;
		this.width = 13 * iNum + 12;
		if(iNum > 0)
			this.iNum = iNum;
		if(codeList != null)
			this.codeList = codeList;
	}

	public String createRandImage() {
		BufferedImage image = new BufferedImage(width, HEIGHT,
				BufferedImage.TYPE_INT_RGB);

		Graphics g = image.getGraphics();

		Random random = new Random();

		if (drawBgFlag) {
			g.setColor(new Color(rBg, gBg, bBg));
			g.fillRect(0, 0, width, HEIGHT);
		} else {
			g.setColor(getRandColor(200, 250));
			g.fillRect(0, 0, width, HEIGHT);

			for (int i = 0; i < 155; i++) {
				g.setColor(getRandColor(140, 200));
				int x = random.nextInt(width);
				int y = random.nextInt(HEIGHT);
				int xl = random.nextInt(12);
				int yl = random.nextInt(12);
				g.drawLine(x, y, x + xl, y + yl);
			}
		}

		g.setFont(new Font("Times New Roman", Font.PLAIN, 18));

		String sRand = "";
		for (int i = 0; i < iNum; i++) {
			int rand = random.nextInt(codeList.length());
			String strRand = codeList.substring(rand, rand + 1);
			sRand += strRand;
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));
			g.drawString(strRand, 13 * i + 6, 16);
		}
		g.dispose();
		try {
			ImageIO.write(image, "JPEG", response.getOutputStream());
		} catch (IOException e) {

		}

		return sRand;
	}

	public void setBgColor(int r, int g, int b) {
		drawBgFlag = true;
		this.rBg = r;
		this.gBg = g;
		this.bBg = b;
	}

	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}

}

3.展示的jsp页面WebRoot/jsp/validate/imagevalidate.jsp

<%@ page contentType="text/html;charset=UTF-8"  %>
<%@ taglib uri="/WEB-INF/pager-taglib.tld" prefix="pg"%>
<form name="frm" method="post" action="/bboss-mvc/rest/imagevalidator">
Hello Image Test<br/>
checkCode:<img src="/bboss-mvc/rest/imagevalidator/abcdefghijk123456/5"><br/>
please input the checkCode:<input type="text" name="imagecode" value=""><br/>
<input type="submit" name="btn1" value="check">
</form> 

${message}

4.控制器配置

5.使用方法和说明

ImageValidatorController映射的根路径为/rest/imagevalidator：

@HandlerMapping("/rest/imagevalidator")
public class ImageValidatorController

方法generateImageCode方法可以映射到以下地址，主要用来生成图形码：

http://localhost:8080/bboss-mvc/rest/imagevalidator/abcefg1234/6

@HandlerMapping(value="/{codelist}/{codenum}",method={RequestMethod.GET,RequestMethod.POST})
	public void generateImageCode(
								  @PathVariable("codelist") String codelist,
								  @PathVariable("codenum") int codenum,
								  HttpServletRequest request,HttpServletResponse response)

地址中的abcefg1234段对应generateImageCode方法的codelist参数，标识生成图像码的种子
地址段中的/6对应generateImageCode方法的codenum参数，标识生成图像码位数
这样generateImageCode方法根据这两个参数生成相应的图形码，并将图像码存放到以imagecodekey作为key的session属性中。
以便后续校验之用。

方法checkImageCode用来校验用户输入的图形码和generateImageCode方法存放在session中图像码，根据比较的结果将相应的结果信息输出到前端，比较完毕后跳转到地址：

/validate/imagevalidate

bboss-mvc根据映射规则将这个地址映射到页面WebRoot/jsp/validate/imagevalidate.jsp

http://localhost:8080/bboss-mvc/rest/imagevalidator
	@HandlerMapping(method={RequestMethod.POST,RequestMethod.GET})
	public ModelAndView checkImageCode(@RequestParam(name="imagecode") String imagecode,
			@Attribute(name="imagecodekey",scope=AttributeScope.SESSION_ATTRIBUTE) String oldcode)
方法参数对应
imagecode参数的值，
oldcode参数的值自动从session中通过key 
imagecodekey自动获取

6.映射规则配置bboss-mvc.xml

<property name="viewResolver" class="org.frameworkset.web.servlet.view.InternalResourceViewResolver" singlable="true">
        <property name="viewClass" value="org.frameworkset.web.servlet.view.JstlView"/>
        <property name="prefix" value="/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </property>