⚡ AJAX + JSON

使用 struts2-json-plugin 实现 AJAX 返回 JSON

// struts.xml 配置
<action name="getUser" class="com.demo.UserAction">
    <result type="json">
        <!-- 可选: 只包含指定属性 -->
        <param name="includeProperties">user\..*,success</param>
    </result>
</action>

public class UserAction extends ActionSupport {
    
    private User user;
    private boolean success;
    private String message;
    
    // getter 是必须的，JSON 插件只序列化有 getter 的属性
    public User getUser() { return user; }
    public boolean isSuccess() { return success; }
    public String getMessage() { return message; }
    
    public String getData() {
        user = new User("张三", "zhangsan@email.com");
        success = true;
        message = "获取成功";
        return SUCCESS;
    }
}

// 原生 fetch
fetch('/getUser')
    .then(r => r.json())
    .then(data => {
        console.log(data.user);
        console.log(data.success);
    });

// jQuery
$.getJSON('/getUser', function(data) {
    $('#username').text(data.user.username);
});

// HTML
<input type="text" id="keyword" onkeyup="search(this.value)"/>
<div id="results"></div>

// JS
function search(keyword) {
    $.getJSON('/search', {keyword: keyword}, function(data) {
        $('#results').empty();
        data.results.forEach(function(item) {
            $('#results').append('<div>' + item.name + '</div>');
        });
    });
}