SpringBoot进阶教程(八十六)URL指定参数encode
Encode(编码)和Decode(解码)是在信息处理中常用的概念,用于表示将信息从一种形式转换为另一种形式的过程。v直接demo
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
public class UrlParamEncoder {
public static void main(String[] args) throws UnsupportedEncodingException {
String url = "https://www.test.com/s?wd=%E7%99%BE%E5%BA%A6&rsv_spt=1&rsv_iqid=0xbe352d6c00064d34&issp=1&f=8&rsv_bp=1&rsv_idx=2&ie=utf-8&tn=baiduhome_pg&rsv_dl=tb&rsv_enter=1&rsv_sug3=17&rsv_sug1=8&rsv_sug7=100&rsv_sug2=0&rsv_btype=i&prefixsug=%25E7%2599%25BE%25E5%25BA%25A6&rsp=6&inputT=3412&rsv_sug4=5053";
String encodedUrl = encodeSpecificParam(url, "prefixsug", true);
System.out.println(url);
System.out.println(encodedUrl);
}
/**
* 对指定参数进行编码
* ignore是否先解码再编码
* @param url
* @param targetParam
* @param ignore
* @return
*/
public static String encodeSpecificParam(String url, String targetParam, boolean ignore) {
try {
// 分割基础URL和查询部分
String[] urlParts = url.split("\\?", 2);
String baseUrl = urlParts;
String queryAndFragment = urlParts.length > 1 ? urlParts : "";
// 分离查询参数和锚点
String[] queryFragment = queryAndFragment.split("#", 2);
String query = queryFragment;
String fragment = queryFragment.length > 1 ? "#" + queryFragment : "";
// 解析查询参数
List<Param> params = parseQueryString(query);
// 编码目标参数
for (Param param : params) {
if (param.key.equals(targetParam)) {
String decoded = ignore ? param.value : URLDecoder.decode(param.value, "UTF-8");
String encoded = URLEncoder.encode(decoded, "UTF-8")
.replace("+", "%20"); // 将+转换为%20
param.value = encoded;
}
}
// 重构查询字符串
StringBuilder newQuery = new StringBuilder();
for (Param param : params) {
if (newQuery.length() > 0) {
newQuery.append("&");
}
newQuery.append(param.key).append("=").append(param.value);
}
// 组合最终URL
return baseUrl
+ (newQuery.length() > 0 ? "?" : "")
+ newQuery.toString()
+ fragment;
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("字符编码错误", e);
}
}
private static List<Param> parseQueryString(String query) {
List<Param> params = new ArrayList<>();
if (query == null || query.isEmpty()) return params;
for (String pair : query.split("&")) {
int idx = pair.indexOf("=");
String key = (idx > 0) ? pair.substring(0, idx) : pair;
String value = (idx > 0 && pair.length() > idx + 1) ? pair.substring(idx + 1) : "";
params.add(new Param(key, value));
}
return params;
}
static class Param {
String key;
String value;
Param(String key, String value) {
this.key = key;
this.value = value;
}
}
}v源码地址
https://github.com/toutouge/javademosecond/tree/master/hellolearn
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