反射检测参数的某个字段不能为空代码,Java代码库,德仔网

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【Java】反射检测参数的某个字段不能为空

作者: / 发布于2017/1/18/ 319

package test;  
  
import java.lang.reflect.Method;  
import java.util.HashMap;  
import java.util.Map;  
  
/** 
 *  
 * @author 0414 
 * 
 */  
public class TestReflectChecker {  
  
    public class Param {  
        private String id;  
  
        private String name;  
  
        private String year;  
  
        private String month;  
  
        private String day;  
          
        public Param() {}  
  
        public String getDay() {  
            return day;  
        }  
  
        public void setDay(String day) {  
            this.day = day;  
        }  
  
        public String getId() {  
            return id;  
        }  
  
        public void setId(String id) {  
            this.id = id;  
        }  
  
        public String getMonth() {  
            return month;  
        }  
  
        public void setMonth(String month) {  
            this.month = month;  
        }  
  
        public String getName() {  
            return name;  
        }  
  
        public void setName(String name) {  
            this.name = name;  
        }  
  
        public String getYear() {  
            return year;  
        }  
  
        public void setYear(String year) {  
            this.year = year;  
        }  
    }  
  
    /** 
     * CHECK_FIELD 
     */  
    private enum CHECK_FIELD {  
        id,  
  
        name,  
  
        year,  
  
        month,  
  
        day  
    }  
  
    private static Map<String, CHECK_FIELD[]> matchMap = new HashMap<String, CHECK_FIELD[]>();  
  
    static {  
        //id 1 : name is not null;  
        matchMap.put("1",  
                new CHECK_FIELD[] { CHECK_FIELD.id, CHECK_FIELD.name });  
  
        //id 2 : year, month, day is not null;  
        matchMap.put("2", new CHECK_FIELD[] { CHECK_FIELD.id, CHECK_FIELD.year,  
                CHECK_FIELD.month, CHECK_FIELD.day });  
    }  
  
    private TestReflectChecker() {  
  
    }  
  
    /** 
     * パラメータをチェック 
     *  
     * @param param 
     * @return 
     */  
    public static boolean check(Param param) {  
        if (param == null) {  
            return false;  
        }  
  
        String id = param.getId();  
  
        CHECK_FIELD[] checkFields = matchMap.get(id);  
  
        if (checkFields == null) {  
            return false;  
        }  
  
        for (CHECK_FIELD field : checkFields) {  
            Method getFieldMethod = getGetMehtodByField(Param.class, field  
                    .toString());  
            try {  
                Object value = getFieldMethod.invoke(param, new Object[] {});  
                if (value == null) {  
                    System.out.println(field + " is null, false will be return .");  
                    return false;  
                }  
            } catch (Exception e) {  
                e.printStackTrace();  
                return false;  
            }  
        }  
  
        return true;  
    }  
  
    /** 
     * fieldからmethodを取得 
     *  
     * @param clazz 
     * @param field 
     * @return 
     */  
    private static Method getGetMehtodByField(Class clazz, String field) {  
        Method method = null;  
  
        String methodName = "get" + field.substring(0, 1).toUpperCase()  
                + field.substring(1);  
        try {  
            method = clazz.getMethod(methodName, new Class[] {});  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return method;  
    }  
  
    public static void main(String[] args) {  
        Param param = new TestReflectChecker().new Param();  
        param.setId("1");  
        param.setName("name");  
        System.out.println(TestReflectChecker.check(param));  
          
        param.setId("2");  
        param.setYear("2011");  
        System.out.println(TestReflectChecker.check(param));  
    }  
  
}

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