Java 里StringBuffer.toString总是乱码

Question

各位好，这是我在网上看到的一个输入框提示的程序，我改了一下，content总是乱码，哪里的编码出问题了呢？我试着把content装成bytes[]在转成string还是乱码。

package com.bobliao;

import java.awt.BorderLayout;
import java.awt.event.KeyAdapter;

import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

import org.apache.http.client.ClientProtocolException;


import java.awt.event.KeyEvent;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLEncoder;
public class SuggestionTest extends JFrame {
    
    private JTextField textInput=new JTextField();
    private JList<String> listSuggestions=new JList<>(); 
    
    public SuggestionTest() {
        
        super("SuggestionTest");
        getContentPane().add(BorderLayout.NORTH,textInput);
        getContentPane().add(BorderLayout.CENTER,
                new JScrollPane(listSuggestions));
        setSize(300,200);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
        
        this.textInput.addKeyListener(new KeyAdapter() {
            @Override
            public void keyReleased(KeyEvent e){
                new Thread(() -> {
                    try{
                        String word=textInput.getText();
                        //word打印出来
                        System.out.println(word);
                        String[] suggestions=fetchSuggestionsFromBaidu(word);
                        SwingUtilities.invokeLater(() -> {
                            listSuggestions.removeAll();
                            listSuggestions.setListData(suggestions);
                            listSuggestions.updateUI();
                        });
                    }
                    catch (Exception ex) {
                        // TODO: handle exception
                        ex.printStackTrace();
                        
                    }
                }).start();
            }
            
            public String[] fetchSuggestionsFromBaidu(String word) throws 
                UnsupportedEncodingException,
                ClientProtocolException,
                IOException {
                //获取建议词
                String url="http://suggestion.baidu.com/su?wd="+URLEncoder.encode(word, "utf8");
                URL urlReal=new URL(url);
                InputStream stream=urlReal.openStream();
                BufferedReader streamReader=new BufferedReader(new InputStreamReader(stream,"utf-8"));
                StringBuffer stringBuffer=new StringBuffer();
                String temp=null;
                while((temp=streamReader.readLine())!=null){
                    stringBuffer.append(temp);
                }
                /*
                 * 这里的content总是会乱码啊*/
                String content=new String(stringBuffer.toString());
                System.out.println(content);
                String[] suggestions=content.replaceAll(".*\\[(.*)\\].*", "$1").replaceAll("\"","").split(",");
                return suggestions;
            }
        });
        this.listSuggestions.addListSelectionListener(e -> {
            textInput.setText(listSuggestions.getSelectedValue());
        });
    }
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() ->{
            new SuggestionTest();
        });
    }
}

Answer 1

两个utf-8换成GBK

Answer 2

因为你的字符中有汉字出现，将字符编码换成GB18030，是中华人民共和国现时最新的内码字集。

Answer 3

具体是设置UTF-8还是GBK，与服务器端保持一致，虽然国内用GBK/GB18030多，但很多网站不只供国内人用，UTF8的也不少。