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JSP实用教程实验四内置对象

2024-04-16 05:00:05基础资料围观404次

本篇文章分享JSP实用教程实验四内置对象，对你有帮助的话记得收藏一下，看Java资料网收获更多编程知识

实验四内置对象

一、实验目的

1. 掌握request对象。

2. 掌握response对象。

3. 掌握session对象。

4. 掌握application对象。

5. 掌握out对象。

6. 掌握每一个内置对象的内容及作用域和生命周期，熟练运用内置对象。

二、实验内容

1、教材4.6.1节 196算法之谜。

2、教材4.6.2节计算器。

3、教材4.6.3节单词的频率。

4、教材4.6.4节成绩与饼图。

5、教材4.6.5节记忆测试。

三、实验步骤

1.196算法之谜

①实验代码

文件ch4_1.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding ="utf-8" %>
<style>
   #tomStyle{
      font-family:宋体;font-size:36;color:blue 
   }
</style> 
<HTML>
	<body id=tomStyle bgcolor = #ffccff>
		<form action="ch4_2.jsp" method=post name=form>
			输入一个正整数数:<br>
			<input type=text name="number" id=tomStyle size=16 value = 520 />
			<br><input type="submit" id=tomStyle value="提交" />
		</form> 
	</body>
</HTML>

文件ch4_2.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<%@ page import = "java.math.BigInteger" %> 
<HTML>
	<body bgcolor = cyan>
		<p style="font-family:宋体;font-size:36;color:black">
		<%!
		public static String reverse(String s) {  
			StringBuffer  buffer = new StringBuffer(s);
			StringBuffer  reverseBuffer = buffer.reverse();  
			return  reverseBuffer.toString();
		}
		%>
		<% 
		String regex = "[1-9][0-9]*";
		String startNumber=request.getParameter("number");
		if(startNumber==null||startNumber.length()==0) {
			startNumber = "520";
		}
		if(!startNumber.matches(regex)) {
			response.sendRedirect("ch4_1.jsp"); 
			return;
		}
		long step = 1;
		BigInteger number = new  BigInteger(startNumber);  
		BigInteger reverseNumber = new BigInteger(reverse(number.toString())); 
		BigInteger resultNumber = number.add(reverseNumber);   
		out.print("<br>"+number+"+"+reverseNumber+"="+resultNumber);
		BigInteger p = new BigInteger(reverse(resultNumber.toString())); 
		while(!resultNumber.equals(p)) {   
			number = new  BigInteger(resultNumber.toString());
			reverseNumber = new  BigInteger(reverse(number.toString()));
			resultNumber = number.add(reverseNumber);
			p = new BigInteger(reverse(resultNumber.toString()));
			out.print("<br>"+number+"+"+reverseNumber+"="+resultNumber);
			step++;
		}
			out.print("<br>"+step+"步得到回文数:"+resultNumber);         
		%>
		</p>
	</body>
</HTML>

②运行结果

2.计算器

①实验代码

文件ch4_3.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<HTML>
	<body bgcolor = #ffccff>
		<form action="ch4_4.jsp" method=post name=form>
		<p style="font-family:宋体;font-size:18;color:blue">
		输入运算数、选择运算符号:<br>
		<input type=text name="numberOne" size=6/>
        <select name="operator" >
			<option selected="selected" value="+">加
			<option value="-">减
			<option value="*">乘
			<option value="/">除
		</select> 
		<input type=text name="numberTwo"  size=6 />
		<br><input type="submit" name="submit" value="提交" />
		</form> 
		</p>
	</body>
</HTML>

文件ch4_4.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<HTML>
	<body bgcolor = cyan>
		<p style="font-family:宋体;font-size:18;color:black">
		<% 
		String numberOne=request.getParameter("numberOne");
		String numberTwo=request.getParameter("numberTwo");
		String operator=request.getParameter("operator");
		if(numberOne==null||numberOne.length()==0) {
			response.sendRedirect("ch4_3.jsp"); 
			return;
		}
		else if(numberTwo==null||numberTwo.length()==0) {
			response.sendRedirect("ch4_3.jsp"); 
			return;
		}
		try{
			double a=Double.parseDouble(numberOne);
			double b=Double.parseDouble(numberTwo);
			double r=0;
			if(operator.equals("+"))
				r=a+b;
			else if(operator.equals("-"))
				r=a-b;
			else if(operator.equals("*"))
				r=a*b;
			else if(operator.equals("/"))
				r=a/b;
			out.print(a+""+operator+""+b+"="+r);
		}
		catch(Exception e){
			out.println("请输入数字字符");
		}
	%>
	</body>
</HTML>

②运行结果

3.单词的频率

①实验代码

文件ch4_5.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<HTML>
	<style>
		#textStyle{
		font-family:宋体;font-size:23;color:blue 
		}
	</style>
	<body bgcolor = #ffccff>
		<p id = "textStyle">输入英文文章，单击提交键：
		<%
		String content = "We are student,are you student?";
		%>
		<form action="ch4_6.jsp" method=post name=form>
			<textArea  name="english" id = "textStyle" rows=5 cols=38><%= content %></textArea>
			<br><input type="submit"  name="submit" id = "textStyle" value="提交"/>
		</form>  
		</p>
	</body>
</HTML>

文件ch4_6.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.util.Iterator" %>
<%@ page import="java.util.regex.Pattern" %>
<%@ page import="java.util.regex.Matcher" %>
<HTML>
	<body bgcolor = cyan>
		<p style="font-family:宋体;font-size:25;color:black">
			<%!
			class Word  {   
			String englishWord;
			int  count ;   
			public boolean equals(Object o) {
					Word wd=(Word)o;
					return englishWord.equals(wd.englishWord);
					} 
				}
			%>
			<%  
			request.setCharacterEncoding("utf-8");
			String englishText=request.getParameter("english");
			ArrayList<Word> wordList = new ArrayList<Word>(); 
			Pattern pattern;             
			Matcher matcher;             
			String regex="[a-zA-Z]+" ;   
			pattern = Pattern.compile(regex);       
			matcher = pattern.matcher(englishText);    
			int allWordAmount = 0;  
			while(matcher.find()) {
			String str = matcher.group();
			allWordAmount++;  
			Word wd = new Word();
			wd.englishWord = str;
			if(!wordList.contains(wd)) { 
				wordList.add(wd);
				wd.count = 1;  
			}
			else {
				int index = wordList.indexOf(wd);
				wd = wordList.get(index);
				wd.count += 1;
				}
			} 
			int diffrentWords = wordList.size();
			Iterator<Word> ite = wordList.iterator();
			out.print("出现了"+ allWordAmount+"个单词:<br>"); 
			out.print("使用了"+ diffrentWords+"个不相同的单词:<br>");
			while(ite.hasNext()) {  
				Word wd = ite.next();
				double fq =(double)(wd.count)/allWordAmount;
				String frequency =String.format("%.2f",fq);
				out.print("<br>"+wd.englishWord+"频率（保留2位小数）"+frequency);   
			}
		%>
		</p>
	</body>
</HTML>

②运行结果

4.成绩与饼图

①实验代码

文件ch4_7.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<HTML>
	<body bgcolor = #ffccff>
		<style>
			#textStyle{
				font-family:宋体;font-size:18;color:blue 
			}
		</style>
		<p id="textStyle">
		<form action="ch4_8.jsp"  method=post >
		输入考试有关数据：<br>
		考试人数：<input type="text" name="totalStudents" value=1 size=12 /><br>
		90~100人数：<input type="text" name="student90" value=1 size=12 /><br>
		80~89人数：<input type="text" name="student80" value=1 size=12 /><br>
		70~79人数：<input type="text" name="student70" value=1 size=12 /><br>
		60~69人数：<input type="text" name="student60" value=1 size=12 /><br>
		0~59人数：<input type="text" name="student59" value=1 size=12 /><br>
		<input type="submit" name="submit" id="textStyle" value="看成绩分析"/><br>
		<input type="submit" name="submit" id="textStyle" value="看成绩饼图"/>
		</form> 
		</p>
	</body>
</HTML>

文件ch4_8.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<%@ page import="java.awt.*" %>
<%@ page import="java.io.OutputStream" %>
<%@ page import="java.awt.image.BufferedImage" %>
<%@ page import="java.awt.geom.*" %>  
<%@ page import="javax.imageio.ImageIO" %>
<%  request.setCharacterEncoding("utf-8"); 
    String submitValue = request.getParameter("submit");
    String totalStudents = request.getParameter("totalStudents"); 
    String students90 = request.getParameter("student90");
    String students80 = request.getParameter("student80");
    String students70 = request.getParameter("student70");
    String students60 = request.getParameter("student60");
    String students59 = request.getParameter("student59");
    int students90_number = Integer.parseInt(students90); 
    int students80_number = Integer.parseInt(students80); 
    int students70_number = Integer.parseInt(students70); 
    int students60_number = Integer.parseInt(students60);
    int students59_number = Integer.parseInt(students59); 
    int totalStudents_number = Integer.parseInt(totalStudents);  
    boolean isRight = totalStudents_number == students90_number+students80_number+
                            students70_number+students60_number+students59_number ;
    if(isRight == false) {
        response.sendRedirect("ch4_7.jsp"); 
        return;
    }
    double percent90 = (double)students90_number/totalStudents_number;
    double percent80 = (double)students80_number/totalStudents_number;
    double percent70 = (double)students70_number/totalStudents_number;
    double percent60 = (double)students60_number/totalStudents_number;
    double percent59 = (double)students59_number/totalStudents_number;
    double angSt = 0;
    double angExt = 0;
    int x = 450,y =50;
    if(submitValue.equals("看成绩饼图")){
        response.setContentType("image/jpeg");
        int width=1000, height=500;
        BufferedImage image = 
        new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        g.fillRect(0, 0, width, height);
        Graphics2D g_2d=(Graphics2D)g; 
        Arc2D arc=new  Arc2D.Double(0,0,400,400,0,360,Arc2D.PIE);
        arc.setAngleStart(angSt);     
        angExt = -percent59*360;
        arc.setAngleExtent(angExt);  
        g_2d.setFont(new Font("",Font.PLAIN,22));
        g_2d.setColor(Color.black);
        g_2d.drawString("黑色不及格",x,y);
        g_2d.fillRect(x+150,35,30,15);
        g_2d.fill(arc);              
        angSt = -percent59*360;
        angExt = -percent60*360;
        arc.setAngleStart(angSt);     
        arc.setAngleExtent(angExt);  
        g_2d.setColor(Color.green);
        g_2d.drawString("绿色为60-69",x,y=y+30);
        g_2d.fillRect(x+150,65,30,15);
        g_2d.fill(arc);              
        angSt = -(percent59*360+percent60*360);
        angExt = -percent70*360;
        arc.setAngleStart(angSt);    
        arc.setAngleExtent(angExt);  
        g_2d.setColor(Color.yellow);
        g_2d.drawString("黄色为70-79",x,y=y+30);
        g_2d.fillRect(x+150,95,30,15);
        g_2d.fill(arc);              
        angSt = -(percent59*360+percent60*360+percent70*360);
        angExt = -percent80*360;
        arc.setAngleStart(angSt);    
        arc.setAngleExtent(angExt);  
        g_2d.setColor(Color.blue);
        g_2d.drawString("蓝色为80-89",x,y=y+30);
        g_2d.fillRect(x+150,125,30,15);
        g_2d.fill(arc);              
        angSt = -(percent59*360+percent60*360+percent70*360+percent80*360);
        angExt = -percent90*360;
        arc.setAngleStart(angSt);     
        arc.setAngleExtent(angExt);  
		g_2d.setColor(Color.pink);
        g_2d.drawString("粉色为90-100",x,y=y+30);
        g_2d.fillRect(x+150,155,30,15);
        g_2d.fill(arc);              
        try {
          OutputStream outClient= response.getOutputStream();
          boolean boo =ImageIO.write(image,"jpeg",outClient);
        }
			catch(Exception exp){}
		}
	%>
<HTML>
	<body bgcolor = #EEEEFF>
		<p style="font-family:宋体;font-size:18;color:blue">
		<%  
			String percent90Result = String.format("%.3f%%",percent90*100);
			String percent80Result = String.format("%.3f%%",percent80*100);
			String percent70Result = String.format("%.3f%%",percent70*100);
			String percent60Result = String.format("%.3f%%",percent60*100);
			String percent59Result = String.format("%.3f%%",percent59*100);
		%> 
		<b>成绩百分比分布(保留3位小数)<br>
		90~100分：<%=percent90Result %><br>
		80~89分：<%=percent80Result %><br>
		70~79分：<%=percent70Result %><br>
		60~69分：<%=percent60Result %><br>
		不及格：<%=percent59Result %><br>
		</p>
	</body>
</HTML>

②运行结果

5.记忆测试

①实验代码

文件ch4_9.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<HTML>
	<body bgcolor = #ffccff>
		<style>
			#textStyle{
				font-family:宋体;font-size:26;color:blue 
			}
		</style>
		<form action="ch4_10.jsp" id ="textStyle" method=post name=form>
		<input type=radio name="grade"  value="5" />初级
		<input type=radio name="grade"  value="7" checked="ok" />中级
		<input type=radio name="grade"  value="10" />高级
		<br><input type="submit"  name="submit" id ="textStyle" value="提交"/>
		<input type="reset" id ="textStyle" value="重置" />
		</form> 
	</body>
</HTML>

文件ch4_10.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.util.Random" %>
<HTML>
	<body bgcolor = #ffccff>
		<style>
			#textStyle{
				font-family:宋体;font-size:36;color:blue 
			}
		</style>
		<%!  
		static ArrayList<String> list = new  ArrayList<String>();
		static {
			list.add("☆");
			list.add("○");
			list.add("△");
			list.add("□");
			list.add("◇");
		}
		String getNextTestString(int length) {
			StringBuffer buffer = new StringBuffer();
			Random random = new Random(); 
			for(int i=0;i<length;i++) {
			int index = random.nextInt(list.size());
			String str = list.get(index);
			buffer.append(str);
			}
			return new String(buffer);
		}
		%>
		<%  
		String grade = request.getParameter("grade");
		if(grade == null){
			grade =(String) session.getAttribute ("grade");
		}
		int number = Integer.parseInt(grade);
		session.setAttribute ("grade" ,grade);
		String testString = null;   
		String yesORNo = null;      
		yesORNo = (String)session.getAttribute ("yesORNo"); 
		if(yesORNo == null) {
			testString = getNextTestString(number);
			session.setAttribute ("yesORNo" ,"yes");
			session.setAttribute ("testString" ,testString);
		}
		else if(yesORNo.equals("yes")){
			response.sendRedirect("ch4_11.jsp");
			return;
		}
		else if(yesORNo.equals("no")){
			testString = getNextTestString(number); 
			session.setAttribute ("yesORNo" ,"yes");
			session.setAttribute ("testString" ,testString);
		}
		%>
		<p id = "textStyle">给5秒种记住您看到的字符序列:<br>
		<%=testString %>
		<br>5秒种后，将转到答题页。
		<%  response.setHeader("refresh","5");
		%>
		</p>
	</body>
</HTML>

文件ch4_11.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<HTML>
	<body bgcolor = #ffccff>
		<style>
			#textStyle{
				font-family:宋体;font-size:26;color:blue 
			}
		</style>
		<form action="ch4_12.jsp" id = textStyle method=post >
		<%
		int n =Integer.parseInt((String)session.getAttribute ("grade"));
		session.setAttribute ("yesORNo" ,"no");
		for(int i=1;i<=n;i++){
			out.print("<br>第"+i+"个字符:");
			out.print("<input type=radio name=R"+i+" value='☆'/>☆"+
              "<input type=radio name=R"+i+" value='○' />○"+ 
              "<input type=radio name=R"+i+" value='△' />△"+ 
              "<input type=radio name=R"+i+" value='□' />□"+ 
              "<input type=radio name=R"+i+" value='◇' />◇");
		} 
		%>
		<br><input type="submit"  name="submit" id ="textStyle" value="提交"/>
		<input type="reset" id ="textStyle" value="重置" />
		</form> 
	</body>
</HTML>

文件ch4_12.jsp:

<%@ page contentType="text/html" %>
<%@ page pageEncoding = "utf-8" %> 
<HTML>
	<body bgcolor = white >
		<p style="font-family:宋体;font-size:26;color:blue"> 
		<%   
		session.setAttribute ("yesORNo" ,"no");
		request.setCharacterEncoding("utf-8"); 
		int n =Integer.parseInt((String)session.getAttribute ("grade")); 
		StringBuffer buffer = new StringBuffer();
		for(int i=1;i<=n;i++){
			buffer.append(request.getParameter("R"+i)); //获取radio提交的值
			out.print(""+request.getParameter("R"+i));
		}
		String userAnswer = new String(buffer);
		String testString = (String)session.getAttribute ("testString");
		if(testString.equals(userAnswer)){
			out.print("您记忆不错");
		}
		else {
			out.print("您没记忆住额!答案是:<br>"+testString);
		}
		%>
		<br><a href = "ch4_10.jsp">返回，继续练习记忆</a>
		<br><a href = "ch4_9.jsp">重新选择级别</a>
		</p>
	</body>
</HTML>

②运行结果

四、实验总结

本次实验通过五个小实验学习了Jsp中内置对象request获取from内的数据进行提交，使用了response对象实现重定向。并使用response对象改变MIME类型，最后一个实验使用了session对象存储用户的数据，以及使用response对象实现重定向和添加新的响应头。

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JSP实用教程实验四内置对象

实验四内置对象

一、实验目的

二、实验内容

三、实验步骤

四、实验总结

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JSP实用教程实验四内置对象

实验四 内置对象

一、实验目的

二、实验内容

三、实验步骤

四、实验总结

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实验四内置对象