1. 案例场景
初步代码实现
public class BankService { //创建用户方法 public static String createUser(String name, String identity, String mobile, int age) throws IOException { StringBuilder stringBuilder = new StringBuilder(); //字符串靠左,多余的地方填充_ stringBuilder.append(String.format("%-10s", name).replace(' ', '_')); //字符串靠左,多余的地方填充_ stringBuilder.append(String.format("%-18s", identity).replace(' ', '_')); //数字靠右,多余的地方用0填充 stringBuilder.append(String.format("%05d", age)); //字符串靠左,多余的地方用_填充 stringBuilder.append(String.format("%-11s", mobile).replace(' ', '_')); //最后加上MD5作为签名 stringBuilder.append(DigestUtils.md2Hex(stringBuilder.toString())); return Request.Post("http://localhost:45678/reflection/bank/createUser") .bodyString(stringBuilder.toString(), ContentType.APPLICATION_JSON) .execute().returnContent().asString(); } //支付方法 public static String pay(long userId, BigDecimal amount) throws IOException { StringBuilder stringBuilder = new StringBuilder(); //数字靠右,多余的地方用0填充 stringBuilder.append(String.format("%020d", userId)); //金额向下舍入2位到分,以分为单位,作为数字靠右,多余的地方用0填充 stringBuilder.append(String.format("%010d", amount.setScale(2, RoundingMode.DOWN).multiply(new BigDecimal("100")).longValue())); //最后加上MD5作为签名 stringBuilder.append(DigestUtils.md2Hex(stringBuilder.toString())); return Request.Post("http://localhost:45678/reflection/bank/pay") .bodyString(stringBuilder.toString(), ContentType.APPLICATION_JSON) .execute().returnContent().asString(); } }
3. 使用接口和反射优化代码
@Data public class CreateUserAPI { private String name; private String identity; private String mobile; private int age; }
3.2 定义注解本身
@Retention(RetentionPolicy.RUNTIME) @Target(ElementType.TYPE) @Documented @Inherited public @interface BankAPI { String desc() default ""; String url() default ""; } @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.FIELD) @Documented @Inherited public @interface BankAPIField { int order() default -1; int length() default -1; String type() default ""; }
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