URLDecoder.decode(String str,String charSet)的大致实现原理

URL编码 百分号编码 URLDecoder.decode的大致实现原理

Java代码

package com.dt.test;

import java.io.UnsupportedEncodingException;

import java.net.URLDecoder;

import java.net.URLEncoder;

/***

* URL编码又叫百分号编码 URLDecoder.decode的大致实现原理

*/

class testURLEncode {

public void testURLEncode() {

String testString;

try {

testString = URLEncoder.encode("中文", "utf-8");

System.out.println("testString :　" + testString);

testString = testString.replace("%", "");

int length = testString.length() / 2;

byte[] data = new byte[length];

for (int i = 0; i < length; i++) {

data[i] = (byte) Integer.parseInt(testString.substring(2 * i,

2 * i + 2), 16);

}

String result = new String(data, "utf-8");

System.out.println("result : " + result);

} catch (UnsupportedEncodingException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

}

public void testURLEncodeGBK() {

String testString;

String testString0;

try {

testString = URLEncoder.encode("中文", "utf-8");

testString0 = testString;

System.out.println("testString :　" + testString);

testString = URLDecoder.decode(testString0,"GBK");

System.out.println("decode : " + testString);

testString = URLDecoder.decode(testString0,"utf-8");

System.out.println("decode : " + testString);

testString = URLEncoder.encode("中文", "GBK");

System.out.println("decode : " + testString);

testString = URLDecoder.decode(testString,"GBK");

System.out.println("decode : " + testString);

} catch (UnsupportedEncodingException e1) {

e1.printStackTrace();

}

}

public static void main(String[] args) {

new testURLEncode().testURLEncode();

new testURLEncode().testURLEncodeGBK();

}

}

url后参数的转码与解码

import java.net.URLDecoder;

import java.net.URLEncoder;

String strTest = "?=abc?中%1&2<3,4>";

strTest = URLEncoder.encode(strTest, "UTF-8");

System.out.println(strTest);

strTest = URLDecoder.decode(strTest,"UTF-8");

System.out.println(strTest);

执行结果：

%3F%3Dabc%3F%E4%B8%AD%251%262%3C3%2C4%3E

?=abc?中%1&2<3,4>