将Java Bean中的值传递给Servlet
[英]Value in a java bean to servlet
问题描述
我难以置信地创造了这一点。 我程序的想法是扮演谁想成为百万富翁，每个豆子都是每个问题。 我正在指示servlet读取Bean并将问题和可能的答案发送到要显示的JSP。 然后，用户将通过超链接选择答案之一，该超链接将查询字符串放入servlet的url中，以检查为实际答案选择的答案。
我也想指出一点，我很新，我知道我的servlet是错误的，我只是不明白如何做到这一点：P谢谢大家花时间看看这个！
这是JSP：
<html>
<link rel="stylesheet" type="text/css" href="css/Millionaire.css">
<body>
<form method="get">
<img src="img/mlogo.jpg" >
<table>
<th> Question: </th>
<th>${Bean.Question}</th>
</table>
<br>
<table>
<tr>
<td><a href="?selectedAnswer=a">A: ${Bean.question} </a></td>
<td><a href="?selectedAnswer=b">B: ${Bean.a2} </a></td>
</tr>
<tr>
<td><a href="?selectedAnswer=c">C: ${Bean.a3} </a></td>
<td><a href="?selectedAnswer=d">D: ${Bean.a4} </a></td>
</tr>
</table>
<br>
<br>
<table>
<th> Life-Lines </th>
<tr>
<td><a href="?selectedLifeLine=1">Skip</a></td>
<td><a href="?selectedLifeLine=2">Skip</a></td>
<td><a href="?selectedLifeLine=3">Skip</a></td>
</tr>
</table>
<br>
<br>
<div><input type="submit" value="Final Answer"><div>
</form>
</body>
</html>
这是我的Servlet：
包裹分配1;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import assignment1.question1;
/**
*
* @author Powa
*/
public class Servlet extends HttpServlet{
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
HttpSession session = request.getSession();
question1.getAttribute("question");
session.setAttribute("Bean","Question");
session.setAttribute("Bean","a1");
session.setAttribute("Bean","a2");
session.setAttribute("Bean","a3");
session.setAttribute("Bean","a4");
}
}
最后是第一个问题的bean：
包裹分配1;
/**
*
* @author Powa
*/
public class question1 implements java.io.Serializable {
private String question = "What type of Pokemon is Pikachu?";
private String a1 = "Fire";
private String a2 = "Water";
private String a3 = "Grass";
private String a4 = "Electric";
private String answer = "Electric";
/**
* @return the question
*/
public String getQuestion() {
return question;
}
/**
* @param question the question to set
*/
public void setQuestion(String question) {
this.question = question;
}
/**
* @return the a1
*/
public String getA1() {
return a1;
}
/**
* @param a1 the a1 to set
*/
public void setA1(String a1) {
this.a1 = a1;
}
/**
* @return the a2
*/
public String getA2() {
return a2;
}
/**
* @param a2 the a2 to set
*/
public void setA2(String a2) {
this.a2 = a2;
}
/**
* @return the a3
*/
public String getA3() {
return a3;
}
/**
* @param a3 the a3 to set
*/
public void setA3(String a3) {
this.a3 = a3;
}
/**
* @return the a4
*/
public String getA4() {
return a4;
}
/**
* @param a4 the a4 to set
*/
public void setA4(String a4) {
this.a4 = a4;
}
/**
* @return the answer
*/
public String getAnswer() {
return answer;
}
/**
* @param answer the answer to set
*/
public void setAnswer(String answer) {
this.answer = answer;
}
}
2 个解决方案
解决方案1
0 2014-10-11 07:38:03
您正在将键设置为a1，a2，a3，a4的“ Bean”。 它覆盖了先前的值。 尝试提供不同的属性名称。 同样，a1，a2 ..值也作为字符串传递。 如果要在问题1类中使用值，请实例化问题1并执行类似session.setAttribute（“ a1”，question1.getA1（））;的操作。
解决方案2
0 2014-10-11 07:51:19
第一步，修改您的servlet：
response.setContentType("text/html");
PrintWriter out = response.getWriter();
HttpSession session = request.getSession();
session.setAttribute("question1",new question1());
并像这样修改您的jsp：
<html>
<link rel="stylesheet" type="text/css" href="css/Millionaire.css">
<body>
<form method="get">
<img src="img/mlogo.jpg" >
<table>
<th> Question: </th>
<th>${sessionScope.question1.question}</th>
</table>
<br>
<table>
<tr>
<td><a href="?selectedAnswer=a">A: ${sessionScope.question1.a1} </a></td>
<td><a href="?selectedAnswer=b">B: ${sessionScope.question1.a2} </a></td>
</tr>
<tr>
<td><a href="?selectedAnswer=c">C: ${sessionScope.question1.a3} </a></td>
<td><a href="?selectedAnswer=d">D: ${sessionScope.question1.a4} </a></td>
</tr>
</table>
<br>
<br>
<table>
<th> Life-Lines </th>
<tr>
<td><a href="?selectedLifeLine=1">Skip</a></td>
<td><a href="?selectedLifeLine=2">Skip</a></td>
<td><a href="?selectedLifeLine=3">Skip</a></td>
</tr>
</table>
<br>
<br>
<div><input type="submit" value="Final Answer"><div>
</form>
</body>
</html>
将Value bean / java传递给servlet
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