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>
