Java到JSP-如何将Java应用程序集成到JSP网页中？

一尘不染

Java到JSP-如何将Java应用程序集成到JSP网页中？

jsp

好的，这肯定是当今最简单的问题。这是我第一次接触Java和JSP。

我只是使用Eclipse编写了一个小的Java应用程序。现在，我想将此小应用程序提供到网页中。我需要弄清楚Java应用程序和网页之间的联系。

这是我的应用程序：

public class PhraseOMatic {

    public static void main(String[] args) {

        // CREATE WORD ARRAYS
    String[] wordListOne = {"24/7", "Multi-tier", "30,000 foot", "B-to-B", "win-win", "front-end", "back-end", "web-based"};
    String[] wordListTwo = {"empowered", "sticky", "concentric", "distributed", "leveraged", "shared", "accelerated", "aligned"};
    String[] wordListThree = {"process", "tipping point", "mindshare", "mission", "space", "paradigm", "portal", "vision"};

    // CALCULATE ARRAY LENGTHS
    int oneLength = wordListOne.length;
    int twoLength = wordListTwo.length;
    int threeLength = wordListThree.length;


    // PRINT OUT THE PHRASE
    int i = 1;
    while (i < 10) {
        // GENERATE RANDOM NUMBERS
        int rand1 = (int) (Math.random() * oneLength);
        int rand2 = (int) (Math.random() * twoLength);
        int rand3 = (int) (Math.random() * threeLength);

        // BUILD A PHRASE
        String phrase = wordListOne[rand1] + " " + wordListTwo[rand2] + " " + wordListThree[rand3];

        // PRINT OUT PHRASE
        System.out.println("What we need is a " + phrase + ".");
        i = i + 1;

    }

}

}

如何获取已编译的应用程序以呈现为网页？接下来我需要采取什么步骤？

谢谢！！！

阅读 300

2020-06-10

共1个答案

一尘不染

1）您必须使用一些返回一些结果的方法来定义一个类。例如

package example;
public class WordLength {

private String word="";
public int length=0;

public WordLength(){}

public void setWord(String w){
    word = w;
    length = word.length();
}

public String getWord(){
    return word;
}

public int getLength(){
    return length;
}

}

2）您必须编译Java文件并生成一个.class。您可以使用命令来完成javac。否则，您可以在Eclipse工作区的文件夹中查找，并在项目的文件夹中找到.classeclipse生成的文件。

3）将此文件放在一个名为WEB_INF\classes\exampletomcatdocuments文件夹根目录的文件夹中。（示例是包的名称）

4）在您的jsp文件中导入java类并使用它：

<!-- wordLegth.jsp -->

<%@ page language="java" import="java.util.*" %>

<html>
  <head>
    <title>Word length</title>
  </head>
  <body>

    <jsp:useBean id="counter" scope="session" class="example.WordLength"/>

    <% 
      String w1= request.getParameter("p1"); 
      int l1 = 0;
      counter.setWord(w1);
      l1 = counter.getLength();
    %>

    <p> The word <%= w1 %> has <%= l1 %> characters.</p>

  </body>
</html>

要求用户插入单词的表单会自动调用此示例：

<!-- form.html -->
<html>
  <head>
    <title>Form</title>
  </head>
  <body>

    <form action="wordLegth.jsp">

      <p> Word 1: <input name="p1"></p>
      </p>
      <input type="submit" value="Count">
    </form>
  </body>
</html>

问候卢卡

2020-06-10