本文介绍了用于生成HTML标签的设计模式的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

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> < 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

解决方案

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>



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?

解决方案

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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08-15 08:12