實驗_Struts2實現登陸功能（驗證碼校驗）

Struts2實現登陸功能（驗證碼校驗）

1.實驗名稱
熟悉Struts2核心文件

2.實驗目的
(1)熟悉Struts2的配置文件web.xml和struts.xml。
(2)熟悉如何書寫用戶定義的控制器。

3.實驗內容
實現如下頁面中登陸的功能。

要求：
管理員登錄後跳到管理員登陸成功的頁面
普通用戶登錄後跳到普通用戶登陸成功的頁面
登錄時用戶名密碼輸入錯跳到出錯頁
註冊和登錄時用戶名，密碼沒有輸入時跳到登陸頁，並在登陸頁上顯示校驗失敗的相關提示

4.文件描述：
ChrUser.java：類中封裝username，password，type，check等屬性及其getter(),setter()方法
CreateImageAction.java:隨機生成驗證碼的Action，其中包含圖片生成過程以及設置瀏覽器緩存的方法。將生成的隨機數放到session中，然後頁面提交驗證隨機數。
LoginAction.java：接收登陸表單頁提交的數據，以及將各類錯誤信息放入session
struts.xml：struts配置文件
login.jsp：登錄頁，包括用戶名，密碼，用戶類型以及驗證碼的顯示與刷新
welcome.jsp：登錄用戶歡迎頁，可顯示用戶類型與用戶名

5.實驗源代碼

ChrUser.java

public class ChrUser {
    private String username;
    private String password;
    private String type;
    private String checkCode;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
    public String getCheckCode() {
        return checkCode;
    }
    public void setCheckCode(String check) {
        this.checkCode = checkCode;
    }
}

CreateImageAction.java

import java.awt.Color;  
import java.awt.Font;  
import java.awt.Graphics;  
import java.awt.image.BufferedImage;  
import java.io.ByteArrayInputStream;  
import java.io.ByteArrayOutputStream;  
import java.util.Random;  
import javax.imageio.ImageIO;  
import javax.servlet.http.HttpServletResponse;  
import javax.servlet.http.HttpSession;  
import org.apache.struts2.ServletActionContext;  
import com.opensymphony.xwork2.ActionSupport;  

public class CreateImageAction extends ActionSupport{  
      private ByteArrayInputStream inputStream;  
      private static int WIDTH = 60;  
      private static int HEIGHT = 20;  
      public ByteArrayInputStream getInputStream()  
      {  
        return inputStream;  
      }  
      public void setInputStream(ByteArrayInputStream inputStream)  
      {  
        this.inputStream = inputStream;  
      }  
      private static String createRandom()  
      {  
         String str = "0123456789qwertyuiopasdfghjklzxcvbnm";  
         char[] rands = new char[4];  
         Random random = new Random();  
         for (int i = 0; i < 4; i++)  
        {  
          rands[i] = str.charAt(random.nextInt(36));  
         }  
          return new String(rands);  
       }  
       private void drawBackground(Graphics g)  
        {  
            // 畫背景  
            g.setColor(new Color(0xDCDCDC));  
            g.fillRect(0, 0, WIDTH, HEIGHT);  
            // 隨機產生 120 個干擾點  
            for (int i = 0; i < 120; i++)  
            {  int x = (int) (Math.random() * WIDTH);  
               int y = (int) (Math.random() * HEIGHT); 
               int red = (int) (Math.random() * 255);  
               int green = (int) (Math.random() * 255);  
               int blue = (int) (Math.random() * 255);  
               g.setColor(new Color(red, green, blue));  
               g.drawOval(x, y, 1, 0);  
            }  
         }  

        private void drawRands(Graphics g, String rands)  
        {  g.setColor(Color.BLACK);  
           g.setFont(new Font(null, Font.ITALIC | Font.BOLD, 18));  
           // 在不同的高度上輸出驗證碼的每個字符  
           g.drawString("" + rands.charAt(0), 1, 17);  
           g.drawString("" + rands.charAt(1), 16, 15);  
           g.drawString("" + rands.charAt(2), 31, 18);  
           g.drawString("" + rands.charAt(3), 46, 16);  
           System.out.println(rands);  
        }  
        public String execute() throws Exception  
        {  HttpServletResponse response = ServletActionContext.getResponse();  
           // 設置瀏覽器不要緩存此圖片  
           response.setHeader("Pragma", "no-cache");  
           response.setHeader("Cache-Control", "no-cache");  
           response.setDateHeader("Expires", 0);  
           String rands = createRandom();  
           BufferedImage image = new BufferedImage(WIDTH, HEIGHT,  
                    BufferedImage.TYPE_INT_RGB);  
           Graphics g = image.getGraphics();  
           // 產生圖像  
           drawBackground(g);  
           drawRands(g, rands);  
           // 結束圖像 的繪製 過程， 完成圖像  
           g.dispose();  
           ByteArrayOutputStream outputStream = new ByteArrayOutputStream();  
           ImageIO.write(image, "jpeg", outputStream);  
           ByteArrayInputStream input = new ByteArrayInputStream(outputStream  
                    .toByteArray());  
           this.setInputStream(input);  
           HttpSession session =ServletActionContext.getRequest().getSession();  
           session.setAttribute("checkCode", rands);     
           input.close();    
           outputStream.close();  
           return SUCCESS;  
        }  
    }

LoginAction.java

import javax.servlet.http.HttpSession;  
import org.apache.struts2.ServletActionContext;  
import com.opensymphony.xwork2.ActionSupport;  
import nuc.sw.User.chrUser;  

public class LoginAction extends ActionSupport{  
    private chrUser user;  
    public User getUser() {  
        return user;  
    }  
    public void setUser(User user) {  
        this.user = user;  
    }  
    public String execute() throws Exception  
    {  
        return SUCCESS;  
}
   @Override
    public String execute() throws Exception {
      // TODO Auto-generated method stub
      //接收登陸表單頁提交的數據
    if(username.equals("程浩然")&&password.equals("123")) {
      ActionContext.getContext().getSession().put("user",username);
      ActionContext.getContext().getSession().put("type",type);
      return SUCCESS;
     }
    else {
      ActionContext.getContext().getSession().put("error","用戶名或密碼錯誤");
      return ERROR;
     }   
}   
    @Override  
    public void validate()  
   {  
      HttpSession session = ServletActionContext.getRequest().getSession();      
      String checkCode2 = (String)session.getAttribute("checkCode");                 if(!checkCode.equals(checkCode2)){  
      addFieldError(checkCode, "輸入的驗證碼不正確,請重新輸入");  
     }
    if(user.getUsername()==null||user.getUsername().trim().equals("")){
      this.addFieldError("usererror", "用戶名不能爲空");
     }
    if(user.getPassword()==null||user.getPassword().trim().equals("")){
      this.addFieldError("passerror", "密碼不能爲空");
     }  
    }  
}

struts.xml

<struts>
    <package name="user" namespace="/" extends="struts-default">
      <action name="LoginAction" class="nuc.sw.action.LoginAction">
       <result name="success">
        /welcome.jsp
       </result>
       <result name="error">
        /login.jsp
       </result>
       <result name="input">
        /login.jsp
       </result>
      </action>
      <action name="createImageAction" class="nuc.sw.action.CreateImageAction">  
       <result name="success" type="stream">  
         <param name="contentType">image/jpeg</param>  
         <param name="inputName">inputStream</param>  
       </result>  
      </action> 
    </package>
</struts>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>    
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript">    
  function refresh() {    
  //IE存在緩存,需要new Date()實現更換路徑的作用    
document.getElementById("image").src="createImageAction.action?+Math.random()"+new Date();    
}    
</script>
<title>登錄頁</title>
</head>
<body>
  <font color="red">${sessionScope.error}</font>
  <font color="red"><s:fielderror></s:fielderror></font>
  <form action="LoginAction" method="post">
    用戶名：<input type="text" name="username"><br>
    密&nbsp;&nbsp;&nbsp;&nbsp;碼：<input type="text" name="password"><br>
    用戶類型：<select name="type">
              <option>普通用戶</option>
              <option>管理員</option>
            </select><br>
    驗證碼：<s:textfield name="checkCode"></s:textfield>
          <img src="image" onclick="refresh" title="看不清？換一個"/><br>
          <s:actionerror cssStyle="color:red"/>
    <input type="submit" value="登陸">
  </form>
</body>
</html>

welcome.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>歡迎頁</title>
</head>
<body>
 歡迎${session.type}${session.user}登陸！
</body>
</html>

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