如何将用户输入从JSP文件调用到Java文件 [英] How to call user input from JSP file into Java file

问题描述

我正在使用JSP编写程序.我有一个包含一些方法的.java文件，并且我有一个.jsp文件，除了一些javascript方法之外，该文件还包含以下内容:

I'm writing a program using JSP. I have a .java file containing a few methods, and I have a .jsp file which contains the following, in addition to a few javascript methods:

<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script> 
<div id="nameDiv"></div>
<div id="nameInput">
    <input type="text" name="nameOne" value="Enter a Name" onClick="if(this.value == 'Enter a Name'){this.value = '';}" /> 
    <input type="text" name="nameTwo" value="Enter a Name" onClick="if(this.value == 'Enter a Name'){this.value = '';}" /> 
    <input type="text" name="nameThree" value="Enter a Name" onClick="if(this.value == 'Enter a Name'){this.value = '';}" /> 
    <input type="button" name="btnUpdate" value="Update Name" />
</div>

我的问题是:如何在Java文件中调用来自这些文本框的用户输入?更好的说是，如何将这些在单独文件(JSP)中的输入调用到我的另一个单独的Java文件中，并使用用户在文本框中输入的值?

My question is: how can I call the user input from these textboxes, in a java file? Or better said, how can I call these inputs which are on a separate file (JSP), into my other separate java file and use the value that the user input in the textbox?

推荐答案

使用servlet作为.java文件，您可以在该servlet类中编写方法

Use a servlet as your .java file,you can write your methods in this servlet class

public class MyServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String name = request.getParameter("nameOne");
        System.out.println("<form action='Myservlet.do' method='get'>");
        System.out.println("nameOne is " + name);
    }


    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String name = request.getParameter("nameThree");
        System.out.println("<form action='Myservlet.do' method='post'>");
        System.out.println("nameThree is " + name);
    }

}

并将其添加到WebContent/WEB-INF中的web.xml中:

and add this to your web.xml in WebContent/WEB-INF :

  <servlet>
    <!--whatever-->
    <servlet-name>MyServlet</servlet-name>
    <!--the position of your own servlet-->
    <servlet-class>com.stackoverflowquizz.servlet.MyServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <!--the same as the one in <servlet>-->
    <servlet-name>MyServlet</servlet-name>
    <!--the action or the url that you can access this servlet-->
    <url-pattern>/Myservlet.do</url-pattern>
  </servlet-mapping>

在.jsp文件中使用<form action = "xx" method="get/post"> <input type="submit">将args传递给.java(servlet文件)

use <form action = "xx" method="get/post"> <input type="submit"> in .jsp file to pass args to .java (servlet file)

    <form action="Myservlet.do" method="get">
        <input type="text" name="nameOne" value="Enter a Name" onClick="if(this.value == 'Enter a Name'){this.value = '';}" /> 
        <input type="text" name="nameTwo" value="Enter a Name" onClick="if(this.value == 'Enter a Name'){this.value = '';}" />
        <input type="submit">
    </form> 
    <form action="Myservlet.do" method="post">
        <input type="text" name="nameThree" value="Enter a Name" onClick="if(this.value == 'Enter a Name'){this.value = '';}" /> 
        <input type="submit">
    </form> 

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