URLBuilder简单快速构建URL链接

曾经终败给现在 2022-06-15 06:19 133阅读 0赞

URLBuilder快速构建一个URL结构，使用了Builder建造者模式，大大增加了代码的可读性，并且可以支持参数URL编码。

package com.kaishustory.quick.commons.text;
    
    import java.nio.ByteBuffer;
    import java.nio.charset.Charset;
    
    public class URLBuilder {
    	private static boolean[] eucIgnore = new boolean[256];
    
    	protected StringBuilder builder = new StringBuilder();
    	protected boolean firstParam = true;
    	protected boolean hasPath = false;
    
    	private static String percentify(String s) {
    		StringBuilder sb = new StringBuilder();
    
    		ByteBuffer bb = Charset.forName("utf-8").encode(s);
    		int size = bb.limit();
    		for (int i = 0; i < size; i++) {
    			sb.append(String.format("%%%02x", new Object[] { Integer.valueOf(bb.get() & 0xFF) }));
    		}
    
    		return sb.toString();
    	}
    
    	public static String encodeURIComponent(String s) {
    		if (s == null) {
    			return null;
    		}
    		if ("".equals(s)) {
    			return "";
    		}
    		StringBuilder sb = new StringBuilder();
    
    		int _i = 0;
    		int c = Character.codePointAt(s, _i);
    		boolean ignore = (c < 256) && (eucIgnore[c]!=false);
    
    		for (int i = 0; i < s.length(); i++) {
    			c = Character.codePointAt(s, i);
    			if (ignore != ((c < 256) && (eucIgnore[c] != false))) {
    				if (ignore)
    					sb.append(s.substring(_i, i));
    				else
    					sb.append(percentify(s.substring(_i, i)));
    				ignore = !ignore;
    				_i = i;
    			}
    		}
    
    		if (ignore)
    			sb.append(s.substring(_i, s.length()));
    		else {
    			sb.append(percentify(s.substring(_i, s.length())));
    		}
    
    		return sb.toString();
    	}
    
    	protected void appendParamPrefix() {
    		if (this.firstParam) {
    			this.firstParam = false;
    			if (this.hasPath)
    				this.builder.append('?');
    		} else {
    			this.builder.append('&');
    		}
    	}
    
    	public URLBuilder appendPath(String path) {
    		if (path == null) {
    			return this;
    		}
    		if ((this.hasPath) || (!this.firstParam)) {
    			throw new IllegalStateException("Missed the trick to set path.");
    		}
    		this.hasPath = true;
    
    		this.builder.append(path);
    
    		return this;
    	}
    
    	public URLBuilder appendParam(String key, String value) {
    		if ((key != null) && (value != null)) {
    			appendParamPrefix();
    			this.builder.append(key).append('=');
    			this.builder.append(value);
    		}
    
    		return this;
    	}
    
    	public URLBuilder appendParamEncode(String key, String value) {
    		if ((key != null) && (value != null)) {
    			appendParamPrefix();
    			this.builder.append(key).append('=');
    			this.builder.append(encodeURIComponent(value));
    		}
    
    		return this;
    	}
    
    	public URLBuilder appendParamEncode(String key, String value, String charset) {
    		appendParamEncode(key, value);
    
    		return this;
    	}
    
    	public URLBuilder appendLabel(String label) {
    		this.builder.append('#').append(label);
    
    		return this;
    	}
    
    	public URLBuilder append(String str) {
    		this.builder.append(str);
    
    		return this;
    	}
    
    	public String toString() {
    		return this.builder.toString();
    	}
    
    	static {
    		String ignore = "1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM-_.!~*'()";
    		for (int i = 0; i < ignore.length(); i++)
    			eucIgnore[Character.codePointAt(ignore, i)] = true;
    	}
    	
    	public static void main(String[] args){
    		URLBuilder urlBuilder = new URLBuilder();
    		urlBuilder.
    			appendPath("https://weixin.kaishustory.com").
    			appendParam("key1", "value1").
    			appendParam("key2", "value2").appendParamEncode("ekey3", "{$#你好}").appendLabel("label");
    		System.err.println(urlBuilder.toString());

}
    }

//https://weixin.kaishustory.com?key1=value1&key2=value2&ekey3=%7b%24%23%e4%bd%a0%e5%a5%bd%7d#label