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Dahua ICC Open API SDK for Java
package com.dahuatech.hutool.core.net;
import com.dahuatech.hutool.core.util.CharUtil;
import com.dahuatech.hutool.core.util.HexUtil;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Serializable;
import java.nio.charset.Charset;
import java.util.BitSet;
/**
* URL编码，数据内容的类型是 application/x-www-form-urlencoded。
*
*
* 1.字符"a"-"z"，"A"-"Z"，"0"-"9"，"."，"-"，"*"，和"_" 都不会被编码;
* 2.将空格转换为%20 ;
* 3.将非文本内容转换成"%xy"的形式,xy是两位16进制的数值;
* 4.在每个 name=value 对之间放置 & 符号。
*
*
* @author looly,
*/
public class URLEncoder implements Serializable {
/**
* 默认{@link URLEncoder}
* 默认的编码器针对URI路径编码，定义如下：
*
*
* pchar = unreserved（不处理） / pct-encoded / sub-delims（子分隔符） / ":" / "@"
* unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
* sub-delims = "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "="
*
*/
public static final URLEncoder DEFAULT = createDefault();
// ---------------------------------------------------------------------------------------------
// Static method start
/**
* 用于查询语句的{@link URLEncoder}
* 编码器针对URI路径编码，定义如下：
*
*
* 0x20 ' ' =》 '+'
* 0x2A, 0x2D, 0x2E, 0x30 to 0x39, 0x41 to 0x5A, 0x5F, 0x61 to 0x7A as-is
* '*', '-', '.', '0' to '9', 'A' to 'Z', '_', 'a' to 'z' Also '=' and '&' 不编码
* 其它编码为 %nn 形式
*
*
* 详细见：https://www.w3.org/TR/html5/forms.html#application/x-www-form-urlencoded-encoding-algorithm
*/
public static final URLEncoder QUERY = createQuery();
private static final long serialVersionUID = 1L;
/** 存放安全编码 */
private final BitSet safeCharacters;
/** 是否编码空格为+ */
private boolean encodeSpaceAsPlus = false;
// ---------------------------------------------------------------------------------------------
// Static method end
/**
* 构造
* [a-zA-Z0-9]默认不被编码
*/
public URLEncoder() {
this(new BitSet(256));
for (char i = 'a'; i <= 'z'; i++) {
addSafeCharacter(i);
}
for (char i = 'A'; i <= 'Z'; i++) {
addSafeCharacter(i);
}
for (char i = '0'; i <= '9'; i++) {
addSafeCharacter(i);
}
}
/**
* 构造
*
* @param safeCharacters 安全字符，安全字符不被编码
*/
private URLEncoder(BitSet safeCharacters) {
this.safeCharacters = safeCharacters;
}
/**
* 创建默认{@link URLEncoder}
* 默认的编码器针对URI路径编码，定义如下：
*
*
* pchar = unreserved（不处理） / pct-encoded / sub-delims（子分隔符） / ":" / "@"
* unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
* sub-delims = "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "="
*
*
* @return {@link URLEncoder}
*/
public static URLEncoder createDefault() {
final URLEncoder encoder = new URLEncoder();
encoder.addSafeCharacter('-');
encoder.addSafeCharacter('.');
encoder.addSafeCharacter('_');
encoder.addSafeCharacter('~');
// Add the sub-delims
encoder.addSafeCharacter('!');
encoder.addSafeCharacter('$');
encoder.addSafeCharacter('&');
encoder.addSafeCharacter('\'');
encoder.addSafeCharacter('(');
encoder.addSafeCharacter(')');
encoder.addSafeCharacter('*');
encoder.addSafeCharacter('+');
encoder.addSafeCharacter(',');
encoder.addSafeCharacter(';');
encoder.addSafeCharacter('=');
// Add the remaining literals
encoder.addSafeCharacter(':');
encoder.addSafeCharacter('@');
// Add '/' so it isn't encoded when we encode a path
encoder.addSafeCharacter('/');
return encoder;
}
/**
* 创建用于查询语句的{@link URLEncoder}
* 编码器针对URI路径编码，定义如下：
*
*
* 0x20 ' ' =》 '+'
* 0x2A, 0x2D, 0x2E, 0x30 to 0x39, 0x41 to 0x5A, 0x5F, 0x61 to 0x7A as-is
* '*', '-', '.', '0' to '9', 'A' to 'Z', '_', 'a' to 'z' Also '=' and '&' 不编码
* 其它编码为 %nn 形式
*
*
* 详细见：https://www.w3.org/TR/html5/forms.html#application/x-www-form-urlencoded-encoding-algorithm
*
* @return {@link URLEncoder}
*/
public static URLEncoder createQuery() {
final URLEncoder encoder = new URLEncoder();
// Special encoding for space
encoder.setEncodeSpaceAsPlus(true);
// Alpha and digit are safe by default
// Add the other permitted characters
encoder.addSafeCharacter('*');
encoder.addSafeCharacter('-');
encoder.addSafeCharacter('.');
encoder.addSafeCharacter('_');
encoder.addSafeCharacter('=');
encoder.addSafeCharacter('&');
return encoder;
}
/**
* 增加安全字符
* 安全字符不被编码
*
* @param c 字符
*/
public void addSafeCharacter(char c) {
safeCharacters.set(c);
}
/**
* 移除安全字符
* 安全字符不被编码
*
* @param c 字符
*/
public void removeSafeCharacter(char c) {
safeCharacters.clear(c);
}
/**
* 是否将空格编码为+
*
* @param encodeSpaceAsPlus 是否将空格编码为+
*/
public void setEncodeSpaceAsPlus(boolean encodeSpaceAsPlus) {
this.encodeSpaceAsPlus = encodeSpaceAsPlus;
}
/**
* 将URL中的字符串编码为%形式
*
* @param path 需要编码的字符串
* @param charset 编码
* @return 编码后的字符串
*/
public String encode(String path, Charset charset) {
int maxBytesPerChar = 10;
final StringBuilder rewrittenPath = new StringBuilder(path.length());
ByteArrayOutputStream buf = new ByteArrayOutputStream(maxBytesPerChar);
OutputStreamWriter writer = new OutputStreamWriter(buf, charset);
int c;
for (int i = 0; i < path.length(); i++) {
c = path.charAt(i);
if (safeCharacters.get(c)) {
rewrittenPath.append((char) c);
} else if (encodeSpaceAsPlus && c == CharUtil.SPACE) {
// 对于空格单独处理
rewrittenPath.append('+');
} else {
// convert to external encoding before hex conversion
try {
writer.write((char) c);
writer.flush();
} catch (IOException e) {
buf.reset();
continue;
}
byte[] ba = buf.toByteArray();
for (int j = 0; j < ba.length; j++) {
// Converting each byte in the buffer
byte toEncode = ba[j];
rewrittenPath.append('%');
HexUtil.appendHex(rewrittenPath, toEncode, false);
}
buf.reset();
}
}
return rewrittenPath.toString();
}
}