Extjs4---登录验证码的实现+struts2

欢迎光临我的小站，共同学习交流技术：http://www.luchg.com

完整代码下载：http://download.csdn.net/detail/lc448986375/4603225

login.js:

//定义验证码控件
Ext.define('CheckCode',{
    extend: 'Ext.form.field.Text', 
    alias: 'widget.checkcode',
    inputTyle:'codefield',
    codeUrl:Ext.BLANK_IMAGE_URL,
    isLoader:true,
    onRender:function(ct,position){
        this.callParent(arguments);
        this.codeEl = ct.createChild({ tag: 'img', src: Ext.BLANK_IMAGE_URL});
        this.codeEl.addCls('x-form-code');
        this.codeEl.on('click', this.loadCodeImg, this);
        
        if (this.isLoader) this.loadCodeImg();
    },
    alignErrorIcon: function() {
        this.errorIcon.alignTo(this.codeEl, 'tl-tr', [2, 0]);
    },
    //如果浏览器发现url不变，就认为图片没有改变，就会使用缓存中的图片，而不是重新向服务器请求，所以需要加一个参数，改变url
    loadCodeImg: function() {
        this.codeEl.set({ src: this.codeUrl + '?id=' + Math.random() });
    }
});


Ext.onReady(
		function(){
			
			 var checkcode = Ext.create('CheckCode',{
				 	cls : 'key',
		            fieldLabel : '验证码',
		            name : 'CheckCode',
		            id : 'CheckCode',
		            allowBlank : false,
		            isLoader:true,
		            blankText : '验证码不能为空',
		            codeUrl: 'getCode',
		            width : 150
		        });
			
			var form = Ext.create(
					'Ext.form.Panel',
					{
						frame:true,
						title:'用户登录',
						width:300,
						height:170,
						//渲染到页面中的loginForm层中
						renderTo:'loginForm',
						//是否可以拖动
						draggable:true,
						//使buttons中的button居中显示
						buttonAlign:'center',
						fieldDefaults:{
							//居左
							labelAlign:'center',
							//宽度
							labelWidth:50,
							//anchor: '90%',
							//错误提示显示在一边(side)，还可以配置为under、title、none
							msgTarget: 'side'
						},
						items:[
						       {
						    	   xtype:'textfield',
						    	   fieldLabel:'用户名',
						    	   name:'name',
						    	   //不允许为空
						    	   allowBlank:false,
						    	   blankText:'用户名不能为空'
						       },
						       {
						    	   xtype:'textfield',
						    	   fieldLabel:'密    码',
						    	   name:'password',
						    	   inputType:'password',
						    	   allowBlank:false,
						    	   blankText:'密码不能为空'
						       },
						       checkcode
						],
						buttons:[
						         {
						        	 text:'登录',
						        	 width:80,
						        	 height:30,
						        	 handler:function(){
						        		 //获取当前的表单form
						        		 var form = this.up('form').getForm();
						        		 //判断否通过了表单验证，如果不能空的为空则不能提交
						        		 if(form.isValid()){
						        			 //alert("可以提交");
						        			 form.submit(
						        					 {
						        						 clientValidation:true,
						        						 waitMsg:'请稍候',
						        						 waitTitle:'正在验证登录',
						        						 url:'user_login',
						        						 success:function(form,action){
						        							 //登录成功后的操作，这里只是提示一下
						        							 Ext.MessageBox.show({
						                                         width:150,
						                                         title:"登录成功",
						                                         buttons: Ext.MessageBox.OK,
						                                         msg:action.result.msg
						                                     })
						        						 },
						        						 failure:function(form,action){
						        							 Ext.MessageBox.show({
						                                         width:150,
						                                         title:"登录失败",
						                                         buttons: Ext.MessageBox.OK,
						                                         msg:action.result.msg
						                                     })
						        						 }
						        					 		
						        					 }
						        			 )
						        		 }
						        	 }
						         },
						         {
						        	 text:'取消',
						        	 width:80,
						        	 height:30,
						        	 handler:function(){
						        		 //点击取消，关闭登录窗口
						        		 var form = this.up('form');
						        		 form.close();
						        	 }
						         }
						]
					}
			)
		}
)

为了布局验证码位置，需要定义一个style.css

#CheckCode{ float:left;}
.x-form-code{width:75px;height:25px;vertical-align:middle;cursor:pointer; float:left; margin-left:7px;}

生成验证码的类：YanZhengMa.java:(英语学的不好，用拼音了。。。。)

package action;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Random;

import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class YanZhengMa {
	static String strCode = null;
	public static final char[] CHARS = {'2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z'};
	public static Random random = new Random();
	
	//获取六位随机数
	public static String getRandomString() {
		StringBuffer buffer = new StringBuffer();
		for (int i = 0;i<4;i++) {
			buffer.append(CHARS[random.nextInt(CHARS.length)]);
		}
		strCode = buffer.toString();
System.out.println("4位随机数："+strCode);
		return strCode;
	}
	
	//获取随机颜色
	public static Color getRandomColor() {
		return new Color(random.nextInt(255),random.nextInt(255),random.nextInt(255));
	}
	
	//返回某颜色的反色
	public static Color getReverseColor(Color c) {
		return new Color(255 - c.getRed(), 255 - c.getGreen(), 255 - c.getBlue());
	}
	
	//创建图片
	public ByteArrayInputStream createImage() {
		String randomString = getRandomString();//获取随机字符串
		
		int width = 80;//设置图片的宽度
		int height = 30;//高度
		
		Color color = getRandomColor();//获取随机颜色，作为背景色
		Color reverse = getReverseColor(color);//获取反色，用于前景色
		
		//创建一个彩色图片
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		Graphics2D g = image.createGraphics();//获取绘制对象
		g.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 23));//设置字体
		
		g.setColor(color);//设置颜色
		
		g.fillRect(0, 0, width, height);//绘制背景
		g.setColor(reverse);//设置颜色
		g.drawString(randomString, 5, 23);
		
		//最多绘制100个噪音点
		for (int i = 0,n = random.nextInt(100); i < n; i++) {
			g.drawRect(random.nextInt(width), random.nextInt(height), 1, 1);
		}
		
		//返回验证码图片的流格式
		ByteArrayInputStream bais = convertImageToStream(image);
		
		return bais;
		
	}
	
	//将BufferedImage转换成ByteArrayInputStream
	private static ByteArrayInputStream convertImageToStream(BufferedImage image){
        
        ByteArrayInputStream inputStream = null;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(bos);
        try {
            jpeg.encode(image);
            byte[] bts = bos.toByteArray();
            inputStream = new ByteArrayInputStream(bts);
        } catch (ImageFormatException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return inputStream;
    }
	
	
	
	
}

然后定义验证码请求的Action：YanZhengMaAction.java:

package action;

import java.io.ByteArrayInputStream;
import java.util.Map;

import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

public class YanZhengMaAction extends ActionSupport implements SessionAware {
	private ByteArrayInputStream bais;
	YanZhengMa yanZhengMa = null;
	String strCode = null;
	private Map session;
	
	public String getCode(){
		yanZhengMa = new YanZhengMa();
		bais = yanZhengMa.createImage();
		strCode = yanZhengMa.strCode;
System.out.println("YanZhengMaAction>randomCode:"+strCode);
		
		//放入session，在login的时候需要用到验证
		session.put("randomCode", strCode);
		return SUCCESS;
	}
	
	public ByteArrayInputStream getBais() {
		return bais;
	}
	public void setBais(ByteArrayInputStream bais) {
		this.bais = bais;
	}
	public void setSession(Map<String, Object> arg0) {
		this.session = arg0;
		
	}
}

登录验证类：UserAction.java:

package action;

import java.io.ByteArrayInputStream;
import java.util.Map;

import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport implements SessionAware {
	//接收name,必须与js中的textfield的name相同，否则取不到值
	private String name;
	private String password;
	//得到页面传来的验证码
	private String CheckCode;
	private Map session;
	//定义一个msg变量，可用于存放错误信息，然后传到前台
	//用于告诉前台时候登录成功
	private boolean success;
	
	public String login(){
		//得到生成的验证码
		String strCode = (String) session.get("randomCode");
System.out.println("UserAction>randomCode:"+strCode);
		if("admin".equals(name) && "admin".equals(password) && CheckCode.toLowerCase().equals(strCode.toLowerCase())){
			success = true;
		}else{
			success = false;
		}
		return SUCCESS;
	}

效果图：