用于生成HTML标签的设计模式 [英] Design Pattern for generating HTML Tags
问题描述
对于可以获取String并输出HTML的小型系统，什么样的设计模式是合适的？
这是一个小例子：
public String makeStrong（String in）{
return< strong> + in +< / strong>;
}
当然，它需要建模一些层次结构，以便它可以适合< ul> 和< ol> 及其子代。我正在考虑装饰器，但复合模式听起来也不错。我应该怎么考虑
使用 AutoCloseable 界面，一个简约的方法将如下：
程序打印
< body>< strong>一些文本< / strong>< ol>< li> a< / li>< li> b< / li>< li> c< / li>< / ol>< / body> code>
在线演示
pre>
public class Main {
public static void main（String args []）{
页面page = new Page（）;
writeBody（page）;
pages.show（）;
}
static void writeBody（页面）{
try（BodyTag bodyTag = new BodyTag（page））{
writeText（page）;
writeList（page）;
}
}
static void writeText（页面）{
try（StrongTag strongTag = new StrongTag（page））{
strongTag.append 一些文字）;
}
}
static void writeList（页面）{
try（ListTag list = new ListTag（page））{
//扭曲（char c = 97; c< 100; ++ c）{
appendElem（page，String.valueOf（c）））的元素
的方式写a，b和c;
}
}
}
static void appendElem（页面，字符串elem）{
try（ListElem li = new ListElem（page））{
li.append（elem）;
}
}
}
class Page {
StringBuilder content = new StringBuilder（）;
void append（String text）{
content.append（text）;
}
void show（）{
System.out.println（content）;
}
}
抽象类标签实现AutoCloseable {
字符串名称;
页面内容;
标签（页面parent，String tagName）{
name = tagName;
content = parent;
content.append（<）;
content.append（name）;
content.append（>）;
}
public void append（String text）{
content.append（text）;
}
@Override
final public void close（）{
content.append（< /）;
content.append（name）;
content.append（>）;
}
}
final class StrongTag extends Tag {
public StrongTag（Page parent）{
super（parent，strong ）;
}
}
final class BodyTag extends Tag {
public BodyTag（Page parent）{
super（parent，body ）;
}
}
最终类ListTag扩展标签{
public ListTag（Page parent）{
super（parent，ol ）;
}
}
final class ListElem extends Tag {
public ListElem（Page parent）{
super（parent，li ）;
}
}
绝对不是笨蛋，但为了简单的使用，它可能是一个好的开始。
For a small system that can get a String and output an HTML, what design pattern would be suitable?
This is a small example:
public String makeStrong(String in) {
return "<strong>" + in + "</strong>";
}
Of course it needs to model some hierarchical structure so that it can fit <ul> and <ol> and their children. I'm thinking of Decorator but Composite pattern sounds good too. What should I consider?
A minimalistic approach would be the following, using the AutoCloseable interface:
The program prints
<body><strong> some text </strong><ol><li>a</li><li>b</li><li>c</li></ol></body>
Online demo
public class Main {
public static void main(String args[]) {
Page page = new Page();
writeBody(page);
page.show();
}
static void writeBody(Page page) {
try (BodyTag bodyTag = new BodyTag(page)) {
writeText(page);
writeList(page);
}
}
static void writeText(Page page) {
try (StrongTag strongTag = new StrongTag(page)) {
strongTag.append(" some text ");
}
}
static void writeList(Page page) {
try (ListTag list = new ListTag(page)) {
// A twisted way to write a, b and c as elements
for (char c=97; c<100; ++c) {
appendElem(page, String.valueOf(c));
}
}
}
static void appendElem(Page page, String elem) {
try (ListElem li = new ListElem(page)) {
li.append(elem);
}
}
}
class Page {
StringBuilder content = new StringBuilder();
void append(String text) {
content.append(text);
}
void show() {
System.out.println(content);
}
}
abstract class Tag implements AutoCloseable {
String name;
Page content;
Tag(Page parent, String tagName) {
name = tagName;
content = parent;
content.append("<");
content.append(name);
content.append(">");
}
public void append(String text) {
content.append(text);
}
@Override
final public void close() {
content.append("</");
content.append(name);
content.append(">");
}
}
final class StrongTag extends Tag {
public StrongTag(Page parent) {
super(parent, "strong");
}
}
final class BodyTag extends Tag {
public BodyTag(Page parent) {
super(parent, "body");
}
}
final class ListTag extends Tag {
public ListTag(Page parent) {
super(parent, "ol");
}
}
final class ListElem extends Tag {
public ListElem(Page parent) {
super(parent, "li");
}
}
Definitely not idiot-proof but for simple uses, it might serve as a good start.
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