如何在Java中将映射值转换为字符串 [英] how to covert map values into string in Java

问题描述

我能够以这种格式打印我的输出 System.out.println（map.get（email））; //这是打印正常但在将其分配给String变量后，我无法打印相同的值。我试过： String email =（String）map.get（email）;
System.out.println（电子邮件 - +电子邮件）; //但这不是打印

如何将地图值转换为字符串？请帮我。

i am able to print my Out-put in this format System.out.println(map.get("email"));//this is printing fine but i am unable to print same value after assigning it into a String variable. i tried: String email=(String) map.get("email"); System.out.println("Email--"+email);//But this is not printing
How can i convert map values into string? Please help me.

我的完整代码：

String url = "https://www.googleapis.com/oauth2/v1/userinfo?alt=json&access_token="
              + authResponse.accessToken; 
            final StringBuffer r = new StringBuffer(); 
            final URL u = new URL(url);
            final URLConnection uc = u.openConnection();
            final int end = 1000;
            InputStreamReader isr = null;
            BufferedReader br = null; 
            isr = new InputStreamReader(uc.getInputStream());
            br = new BufferedReader(isr);
            final int chk = 0; 
            String pat = "\"(.*)\": \"(.*)\",";
            Pattern pattern = Pattern.compile(pat);
            Matcher matcher = null;
            Map map = new HashMap();

            while ((url = br.readLine()) != null)
            {
                if ((chk >= 0) && ((chk < end))) {
                    matcher = pattern.matcher(url);
                    if(matcher.find()) {
                        map.put(matcher.group(1), matcher.group(2));
                    }
                    //r.append(url).append('\n');
                }
            }
              System.out.println(map.get("email")); 
              String email=(String) map.get("email"); 
              System.out.println(email);

推荐答案

试试这个：

String email = map.get（email）。toString（）;

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