java 中类似js encodeURIComponent 函数的实现案例
我就废话不多说了,大家还是直接看代码吧~
import java.io.UnsupportedEncodingException; import java.net.URLDecoder; import java.net.URLEncoder; /** * Utility class for JavaScript compatible UTF-8 encoding and decoding. * * @see http://stackoverflow.com/questions/607176/java-equivalent-to-javascripts-encodeuricomponent-that-produces-identical-output * @author John Topley */ public class EncodingUtil { /** * Decodes the passed UTF-8 String using an algorithm that's compatible with * JavaScript's <code>decodeURIComponent</code> function. Returns * <code>null</code> if the String is <code>null</code>. * * @param s The UTF-8 encoded String to be decoded * @return the decoded String */ public static String decodeURIComponent(String s) { if (s == null) { return null; } String result = null; try { result = URLDecoder.decode(s, "UTF-8"); } // This exception should never occur. catch (UnsupportedEncodingException e) { result = s; } return result; } /** * Encodes the passed String as UTF-8 using an algorithm that's compatible * with JavaScript's <code>encodeURIComponent</code> function. Returns * <code>null</code> if the String is <code>null</code>. * * @param s The String to be encoded * @return the encoded String */ public static String encodeURIComponent(String s) { String result = null; try { result = URLEncoder.encode(s, "UTF-8") .replaceAll("\\+", "%20") .replaceAll("\\%21", "!") .replaceAll("\\%27", "'") .replaceAll("\\%28", "(") .replaceAll("\\%29", ")") .replaceAll("\\%7E", "~"); } // This exception should never occur. catch (UnsupportedEncodingException e) { result = s; } return result; } /** * Private constructor to prevent this class from being instantiated. */ private EncodingUtil() { super(); } }
补充知识:java 代码实现encodeURIComponent和decodeURIComponent,解决空格转义为加号的问题
java自带有一个 java.net.URLDecoder和java.net.URLEncoder。
通过这两个类,可以调用encode()或者decode()方法对字符串进行URL编码。
那既然有了,为什么还要自己实现一套呢?主要原因是Jdk中并没有提供encodeURIComponent和decodeURIComponent的方法。
这两个方法作用其实跟encode()和decode()基本相似。区别主要是,在java中,url编码时,会把空格转换成+号。而某些非java语言实现的客户端一般空格转义出来是 %20 ,这样就容易发生decode不出这个空格的问题。比如IOS中,会把这个+直接显示了,而不是转义成空格。这就跟我们想要的结果违背了。比如js中就自带有encodeURIComponent和decodeURIComponent的方法。
java我们就自己实现一下吧。直接看代码,一看就明白。
/* * 文件名:URIEncode.java 描述: 修改人:gogym 修改时间:2018年11月16日 跟踪单号: 修改单号: 修改内容: */ import java.io.UnsupportedEncodingException; public class URIEncoder { public static final String ALLOWED_CHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()"; /** * Description: * * @param str * @return * @throws UnsupportedEncodingException * @see */ public static String encodeURI(String str) throws UnsupportedEncodingException { String isoStr = new String(str.getBytes("UTF8"), "ISO-8859-1"); char[] chars = isoStr.toCharArray(); StringBuffer sb = new StringBuffer(); for (int i = 0; i < chars.length; i++ ) { if ((chars[i] <= 'z' && chars[i] >= 'a') || (chars[i] <= 'Z' && chars[i] >= 'A') || chars[i] == '-' || chars[i] == '_' || chars[i] == '.' || chars[i] == '!' || chars[i] == '~' || chars[i] == '*' || chars[i] == '\'' || chars[i] == '(' || chars[i] == ')' || chars[i] == ';' || chars[i] == '/' || chars[i] == '?' || chars[i] == ':' || chars[i] == '@' || chars[i] == '&' || chars[i] == '=' || chars[i] == '+' || chars[i] == '$' || chars[i] == ',' || chars[i] == '#' || (chars[i] <= '9' && chars[i] >= '0')) { sb.append(chars[i]); } else { sb.append("%"); sb.append(Integer.toHexString(chars[i])); } } return sb.toString(); } /** * Description: * * @param input * @return * @see */ public static String encodeURIComponent(String input) { if (null == input || "".equals(input.trim())) { return input; } int l = input.length(); StringBuilder o = new StringBuilder(l * 3); try { for (int i = 0; i < l; i++ ) { String e = input.substring(i, i + 1); if (ALLOWED_CHARS.indexOf(e) == -1) { byte[] b = e.getBytes("utf-8"); o.append(getHex(b)); continue; } o.append(e); } return o.toString(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return input; } private static String getHex(byte buf[]) { StringBuilder o = new StringBuilder(buf.length * 3); for (int i = 0; i < buf.length; i++ ) { int n = (int)buf[i] & 0xff; o.append("%"); if (n < 0x10) { o.append("0"); } o.append(Long.toString(n, 16).toUpperCase()); } return o.toString(); } }
/* * 文件名:URIDecode.java 描述: 修改人:gogym 修改时间:2018年11月16日 跟踪单号: 修改单号: 修改内容: */ package com.poly.rbl.plugin.uri; public class URIDecoder { /** * * Description: * * @param encodedURI * @return * @see */ public static String decodeURIComponent(String encodedURI) { char actualChar; StringBuffer buffer = new StringBuffer(); int bytePattern, sumb = 0; for (int i = 0, more = -1; i < encodedURI.length(); i++ ) { actualChar = encodedURI.charAt(i); switch (actualChar) { case '%': { actualChar = encodedURI.charAt(++i); int hb = (Character.isDigit(actualChar) ? actualChar - '0' : 10 + Character.toLowerCase(actualChar) - 'a') & 0xF; actualChar = encodedURI.charAt(++i); int lb = (Character.isDigit(actualChar) ? actualChar - '0' : 10 + Character.toLowerCase(actualChar) - 'a') & 0xF; bytePattern = (hb << 4) | lb; break; } case '+': { bytePattern = ' '; break; } default: { bytePattern = actualChar; } } if ((bytePattern & 0xc0) == 0x80) { // 10xxxxxx sumb = (sumb << 6) | (bytePattern & 0x3f); if (--more == 0) buffer.append((char)sumb); } else if ((bytePattern & 0x80) == 0x00) { // 0xxxxxxx buffer.append((char)bytePattern); } else if ((bytePattern & 0xe0) == 0xc0) { // 110xxxxx sumb = bytePattern & 0x1f; more = 1; } else if ((bytePattern & 0xf0) == 0xe0) { // 1110xxxx sumb = bytePattern & 0x0f; more = 2; } else if ((bytePattern & 0xf8) == 0xf0) { // 11110xxx sumb = bytePattern & 0x07; more = 3; } else if ((bytePattern & 0xfc) == 0xf8) { // 111110xx sumb = bytePattern & 0x03; more = 4; } else { // 1111110x sumb = bytePattern & 0x01; more = 5; } } return buffer.toString(); } }
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