java获取request中的参数以及java解析URL问号后的参数

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;  
 
/**
 * <p>java获取request中的参数、java解析URL问号后的参数<p>
 * @version 1.0
 * @author Alcedo
 * @date 2022年5月22日
 */
public class RequestParametersUtil {
    /**
     *  获取request中参数
     * @param request 页面请求
     */
    public static Map<String, Object> getRequestParameters(HttpServletRequest request) {
         String parameters="";//请求参数
            if("GET".equals(request.getMethod())){//GET请求时的参数
                String urlParameter=request.getQueryString();//网址中的参数
                if(urlParameter!=null&&!"".equals(urlParameter)){
                    try {
                        urlParameter=URLDecoder.decode(urlParameter,"UTF-8");
                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                }else {
                    urlParameter="";
                }
                parameters=urlParameter;
            }else if("POST".equals(request.getMethod())){//POST请求时的参数
                String totalParameter="";//表单及网址中全部参数
                Map<String, String[]> params = request.getParameterMap();
                int parametersNum=request.getParameterMap().size();//参数个数
                int flag=1;
                for (String key : params.keySet()) {    
 
                    String[] values = params.get(key);
                    for (int i = 0; i < values.length; i++) {
                        String value = values[i];
                        totalParameter+= key + "=" + value;
                    }
                    if(flag<parametersNum){
                        totalParameter+="&";
                    }
                    flag+=1;
                }
                parameters=totalParameter;
            }
            Map<String, Object> map=new HashMap<String, Object>();
            String[] arr=parameters.split("&");
            for (int i = 0; i <arr.length; i++) {
                String key=arr[i].substring(0, arr[i].indexOf("="));
                String value=arr[i].substring( arr[i].indexOf("=")+1);
                map.put(key, value);
            }
           return map;
    }
} 

import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Map;
 
/**
 * <p>java获取request中的参数、java解析URL问号后的参数<p>
 * @version 1.0
 * @author Alcedo
 * @date 2022年5月22日
 */
public class GetUrlParameter {
 
    public static Map<String, Object> getParameter(String url) {
        Map<String, Object> map = new HashMap<String, Object>();
        try {
            final String charset = "utf-8";
            url = URLDecoder.decode(url, charset);
            if (url.indexOf('?') != -1) {
                final String contents = url.substring(url.indexOf('?') + 1);
                String[] keyValues = contents.split("&");
                for (int i = 0; i < keyValues.length; i++) {
                    String key = keyValues[i].substring(0, keyValues[i].indexOf("="));
                    String value = keyValues[i].substring(keyValues[i].indexOf("=") + 1);
                    map.put(key, value);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return map;
    }
 
    /**
     * 测试
     * @param args
     */
    public static void main(String[] args) {
        String url = "jdbc:postgresql://localhost:5432/mydb?currentSchema=public&useSSL=false";
        Map<String,Object> map = getParameter(url);
 
        System.out.println(map.toString());
    }
}

import java.net.URLDecoder;
 
/**
 * <p>java获取request中的参数、java解析URL问号后的参数<p>
 * @version 1.0
 * @author Alcedo
 * @date 2022年5月22日
 */
public class GetUrlParameter {
 
    public static String getOneParameter(String url,String keyWord) {
        String retValue = "";
        try {
            final String charset = "utf-8";
            url = URLDecoder.decode(url, charset);
            if (url.indexOf('?') != -1) {
                final String contents = url.substring(url.indexOf('?') + 1);
                String[] keyValues = contents.split("&");
                for (int i = 0; i < keyValues.length; i++) {
                    String key = keyValues[i].substring(0, keyValues[i].indexOf("="));
                    String value = keyValues[i].substring(keyValues[i].indexOf("=") + 1);
                    if (key.equals(keyWord)) {
                        if (value != null || !"".equals(value.trim())) {
                            retValue = value;
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return retValue;
    }
 
    /**
     * 测试
     */
    public static void main(String[] args) {
        String url = "jdbc:postgresql://localhost:5432/mydb?currentSchema=public&useSSL=false";
        String value = getOneParameter(url,"currentSchema");
        String name = getOneParameter(url,"useSSL");
 
        System.out.println(value);
        System.out.println("useSSL".equals(name));
    }
}