Java初级项目如何添加搜索功能_模糊匹配与关键字检索逻辑

public List<User> searchUsersByName(List<User> userList, String keyword) {
    List<User> result = new ArrayList<>();
    for (User user : userList) {
        if (user.getName().contains(keyword)) {
            result.add(user);
        }
    }
    return result;
}

if (user.getName().toLowerCase().contains(keyword.toLowerCase())) {
    result.add(user);
}

public List<User> searchByKeyword(List<User> userList, String keyword) {
    List<User> result = new ArrayList<>();
    String lowerKeyword = keyword.toLowerCase();

    for (User user : userList) {
        String combined = user.getName() + user.getPhone() + user.getEmail();
        if (combined.toLowerCase().contains(lowerKeyword)) {
            result.add(user);
        }
    }
    return result;
}

public List<User> searchByMultipleKeywords(List<User> userList, String keywordInput) {
    List<User> result = new ArrayList<>();
    String[] keywords = keywordInput.trim().split("\s+"); // 按空格拆分

    for (User user : userList) {
        boolean matchAll = true;
        for (String kw : keywords) {
            String lowerKw = kw.toLowerCase();
            if (!user.getName().toLowerCase().contains(lowerKw) &&
                !user.getCity().toLowerCase().contains(lowerKw)) {
                matchAll = false;
                break;
            }
        }
        if (matchAll) {
            result.add(user);
        }
    }
    return result;
}

protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
    String keyword = req.getParameter("q");
    if (keyword == null) keyword = "";
    
    List<User> allUsers = userService.getAllUsers();
    List<User> results = searchByKeyword(allUsers, keyword);
    
    req.setAttribute("users", results);
    req.getRequestDispatcher("user-list.jsp").forward(req, resp);
}

<form method="get" action="search">
    <input type="text" name="q" placeholder="输入姓名或城市...">
    <button type="submit">搜索</button>
</form>