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Java develops custom templates and style functions for form data

王林

Release： 2023-08-07 14:49:43

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Java develops custom templates and style functions for form data

With the development of the Internet, form data is increasingly used in web pages. For developers, how to implement customized templates and style functions for form data is a common requirement. This article will introduce how to use Java development to implement this function, and provide code examples for readers' reference.

1. Requirements Analysis
During the development process, we often encounter situations where we need to use different templates and styles to display form data. For example, when an enterprise publishes job information on a recruitment website, it can choose different templates and styles according to different job types to display job requirements, benefits and other information. Therefore, we need to implement a flexible way to implement customized template and style functions for different form data.

2. Technical Solution
In order to realize the custom template and style functions of form data, we can use the template engine provided by Java to achieve it. Commonly used Java template engines include FreeMarker, Thymeleaf, etc. In this article, we use FreeMarker as an example to explain.

3. Code implementation

Introducing dependencies
In the project’s pom.xml file, add FreeMarker’s dependencies:

<dependency>
    <groupId>org.freemarker</groupId>
    <artifactId>freemarker</artifactId>
    <version>2.3.31</version>
</dependency>

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Create template file
Create a folder named templates in the resource directory of the project, and create a file named form.ftl in the folder to define the template and style of the form.

Template file example:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>表单数据展示页面</title>
    <style>
        /* 定义表单样式 */
        .field-label {
            font-weight: bold;
        }
        .field-value {
            margin: 10px 0px;
        }
        /* 定义其他样式 */
        /* ... */
    </style>
</head>
<body>
    <h2>${formTitle}</h2>
    <hr>
    <ul>
        <#list formData as item>
            <li>
                <span class="field-label">${item.label}：</span>
                <span class="field-value">${item.value}</span>
            </li>
        </#list>
    </ul>
</body>
</html>

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Java code implementation
In the Java code, we first need to organize the form data into a Map object and pass it Render to the template engine.

Sample code:

import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

public class FormTemplateDemo {
    public static void main(String[] args) throws IOException, TemplateException {
        // 1. 配置FreeMarker
        Configuration cfg = new Configuration(Configuration.VERSION_2_3_31);
        cfg.setDirectoryForTemplateLoading(new File("src/main/resources/templates"));

        // 2. 准备模板数据
        Map<String, Object> data = new HashMap<>();
        data.put("formTitle", "招聘信息表");
        data.put("formData", getFormData()); // 自定义表单数据

        // 3. 获取模板
        Template template = cfg.getTemplate("form.ftl");

        // 4. 渲染模板并输出结果
        StringWriter out = new StringWriter();
        template.process(data, out);
        
        // 按需要输出结果，例如写入文件或响应给浏览器
        String result = out.toString();
        System.out.println(result);
    }
    
    private static List<Map<String, Object>> getFormData() {
        List<Map<String, Object>> formData = new ArrayList<>();
        
        // 添加表单数据
        Map<String, Object> field1 = new HashMap<>();
        field1.put("label", "职位名称");
        field1.put("value", "Java开发工程师");
        formData.add(field1);
        
        // 添加其他表单数据
        // ...
        
        return formData;
    }
}

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4. Usage method
Through the above implementation, we can call the main method in the FormTemplateDemo class wherever we need to display form data. Generate the corresponding HTML fragment. According to actual needs, the generated HTML fragment can be saved to a file or responded to the browser.

When you need to adjust the form template or style in the future, you only need to modify the template file form.ftl without modifying the Java code.

Summary:
By using the template engine provided by Java, we can flexibly implement custom template and style functions for form data. By writing template files, we can easily define the structure and style of the form without modifying the Java code. This approach allows developers to focus more on the implementation of business logic and improves development efficiency.

The above is an introduction to the custom template and style functions of Java development form data. I hope it will be helpful to readers. If readers encounter problems in practice, they can leave a message in the comment area and I will try my best to answer it for you.

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