Question

如何将文本字段值从jsp传递给java类。

我的 .jsp 代码是

<html>
<head></head>
<body>
    <FORM>
        Please enter your name:
        <INPUT TYPE="TEXT" NAME="text1">
        <BR>
        <INPUT TYPE="SUBMIT" value="Submit">
    </FORM>
</body>
</html>

我的 .java 类代码是

这里的字符串str我需要获取文本字段值。

class sample{

    String str="";    //C:/check/svntes

    File exportDir = new File(str);
    if (exportDir.exists()) {
        SVNErrorMessage err = SVNErrorMessage.create(SVNErrorCode.IO_ERROR, "Path ''{0}'' already exists", exportDir);
        throw new SVNException(err);
    }
    exportDir.mkdirs();
}

Answer 1

要将值从JSP传递到Java，您需要java Servlet。

从form代码调用servet，然后使用request.getParameter("your value")对象的request api获取值。

JSP页面：

<form action="HelloServlet" method="POST"> 
  Please enter your name:
 <input type="text" name="text1" id="text1">
 <br>
 <input type="submit" value="Submit">
</form>

Servlet：

public class HelloWorld extends HttpServlet { 
protected void doPost(HttpServletRequest request, HttpServletResponse response) 
 throws ServletException, IOException { 

 // reading the user input  
 String text1= request.getParameter("text1"); 
 }
}

Answer 2

嗯..让我们假设你的jsp＆amp; java文件互相交互。如果我错了，请纠正。

A.jsp文件

<html>
<head></head>
<body>
<FORM  ACTION="B.JSP" METHOD="POST"> //edited part
        Please enter your name:
        <INPUT TYPE="TEXT" NAME="text1">
        <BR>
        <INPUT TYPE="SUBMIT" value="Submit">
    </FORM>

</body>
</html>

B.JSP

<jsp:useBean id="sample" scope="page" class="com.home.file.sample" /> // sample is java file name

String name = request.getParameter("text1");
int iRowAffected = 0;   

//-------now pass parameter "name" to your sample java file

sample.function_name("name");

Sample.java

public class sample
{

   public int function_name(String NAME)
   { 

     String str = NAME;

     File exportDir = new File(str);
     if (exportDir.exists()) {
         SVNErrorMessage err = SVNErrorMessage.create(SVNErrorCode.IO_ERROR,        "Path ''{0}'' already exists", exportDir);
         throw new SVNException(err);
     }
     exportDir.mkdirs();

     //continue with your coding 

   }

}

Answer 3

您的java类是servlet吗？

因为那样你需要像这样发布到你的servlet：

<form action="ServletName" method="GET">
    Please enter your name: 
    <input type="text" name="text1" />
    <br />
    <input type="submit" value="Submit" />
</form>

然后在你的servlet中你可以得到这样的字符串值：

String str = request.getParameter("name");

Answer 4

<强> name.jsp

<FORM  action="/submitName" method="get">
        Please enter your name:
        <INPUT TYPE="TEXT" NAME="text1">
        <BR>
        <INPUT TYPE="SUBMIT" value="Submit">
    </FORM>

首先，在上面的jsp文件中，有两件事缺少动作和方法（可选，默认情况下需要＆＃34; get＆＃34;）属性。

现在要获取java类中的输入值，您需要编写 Servlet 类并使用URL映射在 web.xml 中对其进行配置＆＃34; / submitName＆＃34;

<强> MyServlet.java

// Import required java libraries // Extend HttpServlet class public class MyServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name = request.getParameter("text1"); //should be same name as form input name System.out.println(name); } }

web.xml 将如下，

<web-app> <servlet> <servlet-name>myservlet</servlet-name> <servlet-class>MyServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>myservlet</servlet-name> <url-pattern>/submitName</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>name.jsp</welcome-file> </welcome-file-list> </web-app>

Answer 5

我通过这种方式得到答案。它工作正常。

my.jsp code:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>


</head>
<body>
<form >
Enter the word: <input type="text" name="word">
<input type="submit">

<%@ page import = "dem.hashmap"%>  <!-- //importing java class -->
<% 
hashmap hm = new hashmap();  /*  creating reference for my java class */
String inputvalue = request.getParameter("word"); 
String output = hm.dircreation(inputvalue);    /* calling java method */
out.println(inputvalue);
%>

</body>
</html>

我的hashmap .java类：

package dem;

import java.io.File;


public class hashmap {

String nav;


public String dircreation(String dir)
{

    System.out.println("The Value is--------->"+dir);
    boolean success = false;

    File directory = new File(dir);
    System.out.println("1....The Value is--------->"+dir);
    if (directory.exists()) {
        System.out.println("Directory already exists ...");

    } else {
        System.out.println("Directory not exists, creating now");

        success = directory.mkdir();
        if (success) {
        System.out.printf("Successfully created new directory : %s%n", dir);
        } else {
            System.out.printf("Failed to create new directory: %s%n", dir);
        }
    }

    return nav;

}

 }

如何将文本字段值从jsp传递给java类

5 个答案:

A.jsp文件

B.JSP

Sample.java