Java json uri

package test_json_uri;

import java.io.StringReader;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.function.BiConsumer;

import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonNumber;
import javax.json.JsonObject;
import javax.json.JsonReader;
import javax.json.JsonString;
import javax.json.JsonStructure;
import javax.json.JsonValue;

public class TestJsonUri {
    
    public static void dump(String tag, String val) {
        System.out.println(tag + " " + val);
    }

    public static void testURI() throws MalformedURLException {
        
        BiConsumer<String,String> dump;
        
        {
            String urlString = "http://192.168.21.77:8080/swp/mainPage?aa=11&bb%3D22";   
            
            System.out.println(urlString);
            
            URI uri = URI.create(urlString);   
            System.out.println("URI path  " + uri.getPath());   
            System.out.println("URI query " + uri.getQuery());//解碼   
           
            
            
            URL url2 = new URL(urlString);   
           
            dump("URL", url2.getPath());
            dump("URL", url2.getQuery());
            //System.out.println("URL query " + url2.getQuery());//不解碼  
        }
            
         {
            String urlString = "http://192.168.21.77:8080/swp/mainPage?aa=11&bb%3D22";  
            System.out.println(urlString);
            
            URI uri = URI.create(urlString);  
            // System.out.println(uri.getPath());  
            // System.out.println(uri.getQuery());//解碼  
            dump("URI", uri.getPath());
            dump("URI", uri.getQuery());
           
            URL url2 = new URL(urlString);  
            //System.out.println(url2.getQuery());//不解碼  
            dump("URL", url2.getPath());
            dump("URL", url2.getQuery());
          }

    }
    public static void navigateTree(JsonValue tree, String key) {
        if (key != null)
            System.out.print("Key " + key + ":");
        
        switch(tree.getValueType()) {
        case OBJECT:
            System.out.println("OBJECT");
            JsonObject obj = (JsonObject) tree;
            for (String name : obj.keySet()) {
                navigateTree(obj.get(name), name);
            }
            break;
        case ARRAY:
            System.out.println("ARRAY");
            JsonArray arr = (JsonArray) tree;
            for (JsonValue val : arr) {
                navigateTree(val, null);
            }
            break;
        case STRING:
            JsonString st = (JsonString) tree;
            System.out.println("STRING " + st.getString());
            break;
        case NUMBER:
            JsonNumber num = (JsonNumber) tree;
            System.out.println("NUMBER " + num.toString());
            break;
        case TRUE:
        case FALSE:
        case NULL:
            System.out.println(tree.getValueType().toString());
            break;
        }
        
        
    }
    public static void main(String[] args) throws MalformedURLException {
        
        String str = "{\"code\":0, \"err\":\"invalid url\"}";
        
        StringReader in = new StringReader(str);
        
        JsonReader reader = Json.createReader(in);
        
        JsonStructure jsonst = reader.read();
        
        navigateTree(jsonst, null);
        
        JsonObject model =  Json.createObjectBuilder()
                .add("firstName", "Duke")
                .add("lastName", "Java")
                .add("phoneNumbers", Json.createArrayBuilder()
                        .add(Json.createObjectBuilder()
                                .add("type", "home")
                                .add("number","111-333"))).build();
        
        System.out.println(model.toString());
        
        testURI();
        
    
    }
}