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

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class RadomCodeServlet extends HttpServlet
{

?public void doGet(HttpServletRequest request, HttpServletResponse response)
???throws ServletException, IOException {
??doPost(request,response);
?}

?public void doPost(HttpServletRequest request, HttpServletResponse response)
???throws ServletException, IOException {
??//設(shè)置頁面不緩存
??response.setHeader("Pragma","No-cache");
??response.setHeader("Cache-Control","no-cache");
??response.setDateHeader("Expires", 0);
??//在內(nèi)存中創(chuàng)建圖象
??int width=60, height=20;
??BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

??//獲取圖形上下文
??Graphics g = image.getGraphics();

??//生成隨機(jī)類
??Random random = new Random();

??//設(shè)定背景色
??g.setColor(getRandColor(200,250));
??g.fillRect(0, 0, width, height);

??//設(shè)定字體
??g.setFont(new Font("Times New Roman",Font.PLAIN,18));
??
??//隨機(jī)產(chǎn)生155條干擾線，使圖象中的認(rèn)證碼不易被其它程序探測到
??g.setColor(getRandColor(160,200));
??for (int i=0;i<155;i++)
??{
????????? 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);
??}
??
??//取隨機(jī)產(chǎn)生的認(rèn)證碼(4位數(shù)字)
??String sRand="";
??for (int i=0;i<4;i++)
??{
????? String rand=String.valueOf(random.nextInt(10));
????? sRand+=rand;
????? // 將認(rèn)證碼顯示到圖象中
????? g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//調(diào)用函數(shù)出來的顏色相同，可能是因?yàn)榉N子太接近，所以只能直接生成
????? g.drawString(rand,13*i+6,16);
??}

??//將認(rèn)證碼存入SESSION
??request.getSession().setAttribute("rand",sRand);

??//圖象生效
??g.dispose();

??//輸出圖象到頁面
??ImageIO.write(image, "JPEG", response.getOutputStream());??
?}
?
?//給定范圍獲得隨機(jī)顏色
?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);
??? }
?調(diào)用:
?<td height="25">
????????????<div align="right">
?????????????<font color="#000000">驗(yàn)證碼：</font>
????????????</div>
???????????</td>
???????????<td align="left">
????????????<input type="text" name="randCode" size=10></input>
????????????<img style="cursor:hand" name="validatecode"
?????????????src=" servlet/RadomCodeServlet" height="17" align="middle"
?????????????onclick="document.validatecode.src=' servlet/RadomCodeServlet'">
???????????</td>

import java.security.*;

public class MD5
{
? private static MD5 md5 = null;
? private MD5(){}
? public static MD5 getInstance()
? {
??? if (md5 == null)
??? {
????? md5 = new MD5();
??? }
??? return md5;
? }

? /**
?? * Description:encrypt the String by "MD5"
?? * @param str String
?? * @return String
?? */
? public String calcMD5(String str)
? {
??? try
??? {
????? MessageDigest alga = MessageDigest.getInstance("MD5");
????? alga.update(str.getBytes());
????? byte[] digesta = alga.digest();
????? return byte2hex(digesta);
??? }
??? catch (Exception e)
??? {
????? //System.out.println(e.getMessage());
????? return null;
??? }
? }

? private String byte2hex(byte[] b)
? {
??? String hs = "";
??? String stmp = "";
??? for (int n = 0; n < b.length; n++)
??? {
????? stmp = (Integer.toHexString(b[n] & 0XFF));
????? if (stmp.length() == 1)
????? {
??????? hs = hs + "0" + stmp;
????? }
????? else
????? {
??????? hs = hs + stmp;
????? }
????? if (n < b.length - 1)
????? {
??????? hs = hs + "";
????? }
??? }
??? return hs;
? }
}

package com.jama.credentials;

import org.jasig.cas.authentication.principal.Credentials;

public class LoginInfoCredentials
??? implements Credentials
{

??? private String account;
??? private String password;
??? private String randCode;

??? public LoginInfoCredentials()
??? {
??? }

??? public String getAccount()
??? {
??????? return account;
??? }

??? public void setAccount(String account)
??? {
??????? this.account = account;
??? }

??? public String getPassword()
??? {
??????? return password;
??? }

??? public void setPassword(String password)
??? {
??????? this.password = password;
??? }

??? public String getRandCode()
??? {
??????? return randCode;
??? }

??? public void setRandCode(String randCode)
??? {
??????? this.randCode = randCode;
??? }
}


package com.jama.credentials;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jasig.cas.authentication.principal.*;

// Referenced classes of package com.jama.credentials:
//??????????? LoginInfoCredentials

public class LoginInfoToPrincipalResolver
??? implements CredentialsToPrincipalResolver
{

??? private final Log log = LogFactory.getLog(getClass());

??? public LoginInfoToPrincipalResolver()
??? {
??? }

??? public Principal resolvePrincipal(Credentials credentials)
??? {
??????? LoginInfoCredentials loginInfo = (LoginInfoCredentials)credentials;
??????? if(log.isDebugEnabled())
??????? {
??????????? log.debug((new StringBuilder("Creating SimplePrincipal for [")).append(loginInfo.getAccount()).append("]").toString());
??????? }
??????? return new SimplePrincipal(loginInfo.getAccount());
??? }

??? public boolean supports(Credentials credentials)
??? {
??????? return credentials != null && com/jama/credentials/LoginInfoCredentials.isAssignableFrom(credentials.getClass());
??? }
}

function ltrim(str) {
??????? var pattern = new RegExp("^[\\s]+","gi");
??????? return str.replace(pattern,"");
}

function rtrim(str) {
??????? var pattern = new RegExp("[\\s]+$","gi");
??????? return str.replace(pattern,"");
}
function trim(str) {
??????? return rtrim(ltrim(str));
}

index.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<script language="javascript">
function detect(){
? xml=new ActiveXObject("Microsoft.XMLHTTP");
? var post="";
? xml.open("POST","http://localhost:8080/xmlhttp.jsp",false);
? xml.setrequestheader("content-length" ,post.length);
? xml.setrequestheader("content-type" , "application/x-www-form-urlencoded" );
? xml.send(post);
? var res=xml.responseText;
? list.innerText=res;
? setTimeout("detect()",1000);
}
</script>

<body onload = "detect()">
test :
???? <a id="list" >? </a>

</BODY>
</HTML>


xmlhttp.jsp
<%@ page language="java" contentType="text/html;charset=GB2312"%>
<%@ page import ="java.util.*"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>

<BODY>
<%
? Random randor=new Random();
? out.println(randor.nextInt());
%>
</BODY>
</HTML>

jasperreport中可以使用List作為數(shù)據(jù)源，使用格式如下.
List list=this.customerDao.getAllCustomer();? //得到所有客戶
JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
???JasperPrint jasperPrint = JasperFillManager.fillReport(
?????reportFilePath, parameters, ds);
得填充數(shù)據(jù)后，即可輸出顯示到PDF,Excel,Html
到PDF:
public byte[] generatePDF(String begCustNo, String endCustNo,
???String reportTitle, String reportFilePath) throws DemoException {
??// TODO Auto-generated method stub
?//begCustNo,endCustNo分別為查詢傳入的開始編號(hào)，結(jié)束編號(hào).
??jdbcCustomerDao = new JdbcCustomerDao();
??Map parameters = new HashMap();
??parameters.put("ReportTitle", reportTitle);//報(bào)表標(biāo)題
??List list = jdbcCustomerDao.getAllCustomer(begCustNo, endCustNo);
???try {
???JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
???JasperPrint jasperPrint = JasperFillManager.fillReport(
?????reportFilePath, parameters, ds);???return JasperExportManager.exportReportToPdf(jasperPrint);
??} catch (JRException e) {
???throw new DemoException("Report Export Failed.");
??}
?}
到Html:
public byte[] generateHtml(String begCustNo, String endCustNo,
???String reportTitle, String reportFilePath) throws DemoException {
??jdbcCustomerDao = new JdbcCustomerDao();
??Map parameters = new HashMap();
??parameters.put("ReportTitle", reportTitle);
??List list = jdbcCustomerDao.getAllCustomer(begCustNo, endCustNo);
??System.out.println("list size is :" + list.size());
??JRHtmlExporter exporter = new JRHtmlExporter();
??ByteArrayOutputStream oStream = new ByteArrayOutputStream();
??try {
???JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
???JasperPrint jasperPrint = JasperFillManager.fillReport(
?????reportFilePath, parameters, ds);
???exporter.setParameter(
?????JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN,
?????Boolean.FALSE);
???exporter
?????.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
???exporter
?????.setParameter(JRExporterParameter.CHARACTER_ENCODING, "GBK");
???exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, oStream);
???exporter.exportReport();
???byte[] bytes = oStream.toByteArray();
???return bytes;
??} catch (JRException e) {
???throw new DemoException("Report Export Failed.");
??}
?}
到Excel:
public byte[] generateExcel(String begCustNo, String endCustNo,
???String reportTitle, String reportFilePath) throws DemoException {
??jdbcCustomerDao = new JdbcCustomerDao();
??Map parameters = new HashMap();
??parameters.put("ReportTitle", reportTitle);
??List list = jdbcCustomerDao.getAllCustomer(begCustNo, endCustNo);
??System.out.println("list size is :" + list.size());
??JRXlsExporter exporter = new JRXlsExporter(); // Excel
??ByteArrayOutputStream oStream = new ByteArrayOutputStream();
??try {
???JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
???JasperPrint jasperPrint = JasperFillManager.fillReport(
?????reportFilePath, parameters, ds);
???exporter
?????.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
???exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, oStream);
???exporter.setParameter(
?????JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,
?????Boolean.TRUE);
???exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET,
?????Boolean.FALSE);
???exporter.setParameter(
?????JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND,
?????Boolean.FALSE);
???exporter.exportReport();
???byte[] bytes = oStream.toByteArray();
???return bytes;

??} catch (JRException e) {
???throw new DemoException("Report Export Failed.");
??}
?}

jsp調(diào)用方法：
?<%
????
???
?String filePath=getServletContext().getRealPath("/")+"report.jasper";?

?CustomerServiceImpl? custs=new CustomerServiceImpl();
??? byte[] bytes=null;
? String begNo=request.getParameter("beginCustNo");
? String endNo=request.getParameter("endCustNo");
? String type=request.getParameter("type");

? if(type.equals("Pdf")){?
????? bytes=?custs.generatePDF(begNo,endNo,"客戶資料明細(xì)表",filePath);
? }else if(type.equals("Excel")){
?? bytes=custs.generateExcel(begNo,endNo,"客戶資料明細(xì)表",filePath);
? }else
???? bytes=custs.generateHtml(begNo,endNo,"客戶資料明細(xì)表",filePath);

?if(bytes!=null){
??if(type.equals("Pdf")){
??????? ?response.setContentType("application/pdf");
??}else if(type.equals("Excel")){
???? response.setContentType("application/vnd.ms-excel");
??}else
???response.setContentType("text/html");
??? response.setContentLength(bytes.length);
??? ServletOutputStream ouputStream = response.getOutputStream();
??? ouputStream.write(bytes,0,bytes.length);
??? ouputStream.flush();
??? ouputStream.close();
?}else
?{
??out.println("error");
?}
?

?

? %>