import java.util.regex.Matcher; 
import java.util.regex.Pattern;
 public class RegisterCheck { 
    /** 
     * 验证输入的邮箱格式是否符合 
     * @param email 
     * @return 是否合法 
     */ 
public static boolean emailFormat(String email) 
    { 
        boolean tag = true; 
        final String pattern1 = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$"; 
        final Pattern pattern = Pattern.compile(pattern1); 
        final Matcher mat = pattern.matcher(email); 
        if (!mat.find()) { 
            tag = false; 
        } 
        return tag; 
    } 
}  

//在www.json.org上公布了很多Java下的json解析工具，其中org.json和json-lib比较简单，两者使用上差不多。下面两段源代码是分别使用这两个工具解析和构造//JSON的演示程序。   
//这是使用json-lib的程序：   
import java.util.HashMap;   
import java.util.Map;   
  
import net.sf.json.JSONObject;   
  
public class Test {   
  
    public static void main(String[] args) {   
        String json = "{\"name\":\"reiz\"}";   
        JSONObject jsonObj = JSONObject.fromObject(json);   
        String name = jsonObj.getString("name");   
        
        jsonObj.put("initial", name.substring(0, 1).toUpperCase());   
  
        String[] likes = new String[] { "JavaScript", "Skiing", "Apple Pie" };   
        jsonObj.put("likes", likes);   
  
        Map <String, String> ingredients = new HashMap <String, String>();   
        ingredients.put("apples", "3kg");   
        ingredients.put("sugar", "1kg");   
        ingredients.put("pastry", "2.4kg");   
        ingredients.put("bestEaten", "outdoors");   
        jsonObj.put("ingredients",ingredients);   
        
        System.out.println(jsonObj);   
    }   
}   
//这是使用org.json的程序：   
import java.util.HashMap;   
import java.util.Map;   
  
import org.json.JSONException;   
import org.json.JSONObject;   
  
public class Test {   
  
    public static void main(String[] args) throws JSONException {   
        String json = "{\"name\":\"reiz\"}";   
        JSONObject jsonObj = new JSONObject(json);   
        String name = jsonObj.getString("name");   
  
        jsonObj.put("initial", name.substring(0, 1).toUpperCase());   
  
        String[] likes = new String[] { "JavaScript", "Skiing", "Apple Pie" };   
        jsonObj.put("likes", likes);   
  
        Map <String, String> ingredients = new HashMap <String, String>();   
        ingredients.put("apples", "3kg");   
        ingredients.put("sugar", "1kg");   
        ingredients.put("pastry", "2.4kg");   
        ingredients.put("bestEaten", "outdoors");   
        jsonObj.put("ingredients", ingredients);   
        System.out.println(jsonObj);   
  
        System.out.println(jsonObj);   
    }   
}