网站建站 公司无锡,从化网站建设价格,网站页头页尾怎么做浏览器缓冲设置,重庆市网络营销推广STS中开发步骤
建普通jsp项目过程
1.建项目#xff08;非Maven项目#xff09; new----project----other----Web----Dynamic Web Project
2.下载包放到LIB目录中,如果是Maven项目可以自动导包#xff08;pom.xml中设置好#xff09; 3.设置工作空间#xff0c;网页…STS中开发步骤
建普通jsp项目过程
1.建项目非Maven项目 new----project----other----Web----Dynamic Web Project
2.下载包放到LIB目录中,如果是Maven项目可以自动导包pom.xml中设置好 3.设置工作空间网页的编码我常用UTF-8) 3.分层dao,vo,servlet…)
一个构建maven项目的过程
《1》 《2》
《3》配置maven 《4》下图中爆红是因为Dynamic Web Module模式版本太低了现在我们都3.x了这里还是2.5如下面第二图所示。 处理办法 先去掉那个勾选再点应用apply)选勾选3.1版本同时到下面点击’Further configuration available…,我们勾选Generate web.xml。。。,让项目自建web.xml文件。 《5》build path,即增加jdk库apache库 一个自已写的settings.xml,里面没有设置从远程仓库上传下载功能只设了阿里云下载镜像包。对IDEA 也适用
?xml version1.0 encodingUTF-8?
settings xmlnshttp://maven.apache.org/SETTINGS/1.0.0xmlns:xsihttp://www.w3.org/2001/XMLSchema-instancexsi:schemaLocationhttp://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsdlocalRepositoryC:\Users\Administrator\Desktop\maven\repository/localRepositorypluginGroupspluginGrouporg.codehaus.plugins/pluginGroup/pluginGroupsproxies/proxiesmirrorsmirroridaliyunmaven/idnamealiyun maven/nameurlhttp://maven.aliyun.com/nexus/content/groups/public//urlmirrorOfcentral/mirrorOf/mirror /mirrors
profiles
!--jdk版本一劳永逸的改法,因为系统默认为1.5版,太扯了--profileidjdk-1.8/idactivationactiveByDefaulttrue/activeByDefaultjdkjdk1.8/jdk/activationpropertiesmaven.compiler.source1.8/maven.compiler.sourcemaven.compiler.target1.8/maven.compiler.targetmaven.compiler.compilerVersion1.8/maven.compiler.compilerVersion/properties/profile/profiles
!--激活下载仓库预文件--activeProfilesactiveProfilemyProfile/activeProfile/activeProfiles
/settingsjsp-servlet验证码开发
1.index.jsp嵌入由下面的servlet生成的图片并刷新可重新获得验证码
% page contentTypetext/html;charsetUTF-8 languagejava %
html
headtitle登录界面/titlescriptfunction reloadCode() {var timenew Date().getTime();document.getElementById(imagecode).src% request.getContextPath()%/servlet/ImageServlet?datetime;}/* js部分的Date相关是防止浏览器缓存后不能正常刷新添加时间的唯一性来实现能够及时刷新和展示。js 部分可以参阅JavaScript 语言入门也可以在ImageServlet中添加防止浏览器缓存的语句response.setHeader(Pragma, No-cache);*//script
/head
body
form action% request.getContextPath()%/servlet/ValidateServlet methodget 请您输入账号:input typetext nameaccount /BR请您输入密码:input typepassword namepassword /BR验证码:input typetext namecheckCode/br/img alt验证码 idimagecode src% request.getContextPath()%/servlet/ImageServlet/a hrefjavascript:reloadCode();看不清楚/abrbr/input typesubmit value提交
/form
/body
/html2.Servelt生成验证码图片
import java.awt.Color;
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.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class ImageServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {BufferedImage bi new BufferedImage(68, 22, BufferedImage.TYPE_INT_RGB);//创建图像缓冲区Graphics g bi.getGraphics(); //通过缓冲区创建一个画布Color c new Color(200, 150, 255); //创建颜色g.setColor(c); //为画布创建背景颜色g.fillRect(0, 0, 68, 22); //填充矩形char[] ch ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.toCharArray();//转化为字符型的数组Random r new Random();int len ch.length;int index; //index用于存放随机数字StringBuffer sb new StringBuffer();for (int i 0; i 4; i) {index r.nextInt(len); //产生随机数字g.setColor(new Color(r.nextInt(88), r.nextInt(188), r.nextInt(255))); //设置颜色g.drawString(ch[index] , (i * 15) 3, 18); //画数字以及数字的位置sb.append(ch[index]);}request.getSession().setAttribute(piccode, sb.toString());ImageIO.write(bi, JPG, response.getOutputStream());}
}3.Servlet逻辑判断验证是否正确再进行相应的跳转
public class ValidateServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setHeader(Pragma, No-cache);response.setContentType(text/html;charsetutf-8);//解决乱码问题//得到提交的验证码String code request.getParameter(checkCode);//获取session中的验证码HttpSession session request.getSession();String randStr (String)session.getAttribute(piccode);response.setCharacterEncoding(utf8);PrintWriter out response.getWriter();if(!code.equals(randStr)){out.println(验证码错误);}else{out.println(验证码正确!跳转到LoginServlet......);} out.flush();//将流刷新out.close();//将流关闭}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response); }
}
4.测试 我首先生成验证码图片看看 http://localhost/yanzhengma/index.jsp 然后测试提交效果。
JFreeChart开发图片报表
在web开发过程中经常需要将数据以比较直观的方式显示出来此时报表能够起到很好的作用。 JAVA技术报表的代表产品有JFreeChart,JasperReports,iReport,FineReport,iText等。
下载JFreeChart包
https://sourceforge.net/projects/jfreechart/
下载后解压到解压的文件目录的lib下复制如下两个文件到WebContent目录WEB-INF的lib目录下 1.web.xml
servletservlet-nameDisplayChart/servlet-nameservlet-classorg.jfree.chart.servlet.DisplayChart/servlet-class/servletservlet-mappingservlet-nameDisplayChart/servlet-nameurl-pattern/DisplayChart/url-pattern/servlet-mapping1.1开发柱状报表 《1》。实例化数据集org.jfree.data.category.DefaultCategoryDataset类 《2》添加数据给DefaultCategoryDatase对象当然也可以从数据库中查询
datase.addValue(value1,value2,value3);value1为纵坐标的值value2是纵坐标中的各个项目的种类value3是横坐标中各个项目的种类。实际上value1即为人数数据value2可以为NULL,因为纵坐标没有对人数进行细分。 《3》。通过工厂类org.jfree.chart.ChartFactory创建柱状报表。
JFreeChart chart ChartFactory.createBarChart(value1,value2,value3,value4,value5,false,false,false);各参数的意义如下
value1:表示柱状报表的标题
value2:表示柱状表的横坐标名称如“成绩”
value3:表示。。。。纵坐标的名称如‘人数’
value4数据集
value5表示的是所作之图是水平还是坚直可以用org.jfree.chart.plot.PlotOrientation的常量表示.VERTICAL 和 .HORIZONTAL《4》。用org.jfree.chart.servlet.ServletUtilities将chart保存为图片确定宽高并确定保存的范围一般session然后组图片路径。
String filename ServeltUtilities.saveChartAsPng(chart,width,height,session);
String graphUrl /项目名/DisplayChart?filenamefilename;《5》设置中文体体在jsp页面中显示图片 Font font new Font(隶书, Font.PLAIN, 20);StandardChartTheme sthemenew StandardChartTheme(CN); stheme.setExtraLargeFont(font); //设置标题字体stheme.setLargeFont(new Font(宋书,Font.PLAIN,20)); //设置轴向字体stheme.setRegularFont(font); //设置图例字体ChartFactory.setChartTheme(stheme); //应用字体功能jsp页中显示图片
img src%graphURL%/img
案例显示男女成绩分布报表
%page importorg.jfree.data.general.DatasetUtilities%
%page importorg.jfree.data.category.CategoryDataset%
%page importorg.jfree.chart.StandardChartTheme%
%page importorg.jfree.chart.servlet.ServletUtilities%
%page importorg.jfree.chart.JFreeChart%
%page importorg.jfree.chart.plot.PlotOrientation%
%page importorg.jfree.chart.ChartFactory,java.awt.*%
%page importorg.jfree.data.category.DefaultCategoryDataset%
% page languagejava contentTypetext/html; charsetUTF-8pageEncodingUTF-8%html
head
meta http-equivContent-Type contenttext/html; charsetUTF-8
title柱状报表2美化了/title
/headbody%double[][] data new double[][]{{1,2},{3,5},{7,5},{7,8},{2,6}};String[] rowKeys new String[]{优秀,良好,中等,及格,不及格};String[] columnKeys {男,女};Font font new Font(隶书, Font.PLAIN, 20);StandardChartTheme sthemenew StandardChartTheme(CN); stheme.setExtraLargeFont(font); //设置标题字体stheme.setLargeFont(new Font(宋书,Font.PLAIN,20)); //设置轴向字体stheme.setRegularFont(font); //设置图例字体ChartFactory.setChartTheme(stheme); CategoryDataset dataset DatasetUtilities.createCategoryDataset(rowKeys,columnKeys,data);JFreeChart chart ChartFactory.createBarChart3D(考试成绩统计表按性别,成绩,人数,dataset,PlotOrientation.VERTICAL,true,false,false); String filename ServletUtilities.saveChartAsPNG(chart,600,400,session);String graphURL /jfreechart/DisplayChart?filenamefilename;%
img src%graphURL %
/body
/html测试 http://localhost:8080/jfreechart/barchar2.jsp 1.2开发饼状报表
html
head
meta http-equivContent-Type contenttext/html; charsetUTF-8
title饼状报表/title
/head
body%DefaultPieDataset dataset new DefaultPieDataset();dataset.setValue(优秀,0.45);dataset.setValue(良好,0.3);dataset.setValue(中等,0.1);dataset.setValue(及格,0.05);dataset.setValue(不及格,0.1);Font font new Font(隶书, Font.PLAIN, 20);StandardChartTheme sthemenew StandardChartTheme(CN); stheme.setExtraLargeFont(font); //设置标题字体stheme.setLargeFont(new Font(宋书,Font.PLAIN,20)); //设置轴向字体stheme.setRegularFont(font); //设置图例字体ChartFactory.setChartTheme(stheme); JFreeChart chart ChartFactory.createPieChart3D(考试成绩统计图,dataset,true,false,false);String filename ServletUtilities.saveChartAsPNG(chart,600,400,session);String graphURL /jfreechart/DisplayChart?filenamefilename;%img src%graphURL %/img
/body
/html1.3曲线报表 下面是双曲线单曲线只要减少一个TimeSeries对象即可。
page importorg.jfree.chart.servlet.ServletUtilities%
%page importorg.jfree.chart.title.TextTitle%
%page importorg.jfree.data.time.Month%
%page importorg.jfree.data.time.TimeSeries%
%page importorg.jfree.data.time.TimeSeriesCollection%
%page importorg.jfree.chart.ChartFactory%
%page importjava.awt.*%
%page importorg.jfree.chart.StandardChartTheme%
%page importorg.jfree.chart.JFreeChart%
% page languagejava contentTypetext/html; charsetUTF-8pageEncodingUTF-8%html
headtitle曲线图报表/title
/head
body
%TimeSeriesCollection lineDataset new TimeSeriesCollection();TimeSeries timeSeries new TimeSeries(熊少文,Month.class);timeSeries.add(new Month(1,2024),85);timeSeries.add(new Month(2,2024),76);timeSeries.add(new Month(3,2024),65);timeSeries.add(new Month(4,2024),80);timeSeries.add(new Month(5,2024),66);timeSeries.add(new Month(6,2024),72);timeSeries.add(new Month(7,2024),83);timeSeries.add(new Month(8,2024),88);timeSeries.add(new Month(9,2024),85);timeSeries.add(new Month(10,2024),74);timeSeries.add(new Month(11,2024),78);timeSeries.add(new Month(12,2024),63);lineDataset.addSeries(timeSeries);TimeSeries timeSeries2 new TimeSeries(徐会凤,Month.class);timeSeries2.add(new Month(1,2024),98);timeSeries2.add(new Month(2,2024),95);timeSeries2.add(new Month(3,2024),89);timeSeries2.add(new Month(4,2024),88);timeSeries2.add(new Month(5,2024),86);timeSeries2.add(new Month(6,2024),82);timeSeries2.add(new Month(7,2024),93);timeSeries2.add(new Month(8,2024),98);timeSeries2.add(new Month(9,2024),85);timeSeries2.add(new Month(10,2024),74);timeSeries2.add(new Month(11,2024),78);timeSeries2.add(new Month(12,2024),83);lineDataset.addSeries(timeSeries2);JFreeChart chart ChartFactory.createTimeSeriesChart(每月考试成绩,月份,成绩,lineDataset,true,false,false);Font font new Font(隶书, Font.PLAIN, 20);StandardChartTheme sthemenew StandardChartTheme(CN); stheme.setExtraLargeFont(font); //设置标题字体stheme.setLargeFont(new Font(宋书,Font.PLAIN,20)); //设置轴向字体stheme.setRegularFont(font); //设置图例字体ChartFactory.setChartTheme(stheme);//设置子标题 TextTitle subTtitle new TextTitle(2024年度);chart.addSubtitle(subTtitle);//设置主标题 chart.setTitle(new TextTitle(每月月考成绩));chart.setAntiAlias(true);String filename ServletUtilities.saveChartAsPNG(chart,600,400,session);String graphURL request.getContextPath()/DisplayChart?filenamefilename;%
img src%graphURL%
/body
/htmliText开发动态PDF报表 pdf是由服务器生成的不是客户端生成的。 该应用我用maven项目来做因为iText pdf java包太难自主下载了我用maven自动下载。 新建一个maven工程 maventest 导包pom.xml dependenciesdependencygroupIdcom.itextpdf/groupIdartifactIditext7-core/artifactIdversion7.1.9/versiontypepom/type/dependency/dependencies建一个jsp页面创建一个空白文档
%page importcom.itextpdf.layout.Document%
%page importcom.itextpdf.kernel.pdf.PdfDocument%
%page importcom.itextpdf.kernel.pdf.PdfWriter%
%page importcom.itextpdf.kernel.pdf.DocumentProperties%
% page languagejava contentTypetext/html; charsetUTF-8pageEncodingUTF-8%html
head
meta http-equivContent-Type contenttext/html; charsetUTF-8
titleInsert title here/title
/head
body%String desC:\\;String dest dessample.pdf;PdfWriter writer new PdfWriter(dest);// 2、创建一个 PdfDocument参数为PdfWriterPdfDocument pdfDoc new PdfDocument(writer);// 3、用PdfDocument创建一个空白 page pdfDoc.addNewPage();// 4、创建一个 Document参数为PdfDocumentDocument document new Document(pdfDoc);// 5、关闭 documentPdfDocumentdocument.close();pdfDoc.close();
%
/body
/html
