1 @Taget({ElementType.METHOD, ElementType.TYPE})
2
3 CONSTRUCTOR 构造方法
4 FIELD 字段声明
5
6 LOCAL_VARIABLE 局部变量
7
8 METHOD 方法声明
9
10 PACKAGE 包声明
11
12 PARAMENTER 参数声明
13
14 TYPE 类或接口
15
16 @Retention(RetentionPolicy.RUNTIME)
17
18 SOURCE 只在源码显示，编译时会丢弃
19
20 CLASS 编译时会记录到class中，运行时忽略
21
22 RUNTIME 运行时存在，可以通过反射读取
23
24 @Inherited
25
26 允许自雷继承
27
28 @Documented
29
30 生成javadoc时会包含注解
1 /**
2 * Description: ToStringIgnore
3 * 这个方法表示ToString方法忽略该字段
4 */
5 @Retention(RetentionPolicy.RUNTIME)
6 @Target({ ElementType.FIELD })
7 @Documented
8 public @interface ToStringIgnore {
9
10 }
1 public class ToStringUtils {
2
3 private static Joiner joiner = Joiner.on(", \n");
4
5 public static String toString(Object o) {
6 String str = o.getClass().getSimpleName() + " { \n";
7 Field[] declaredFields = o.getClass().getDeclaredFields();
8 List<String> fields = Lists.newArrayList();
9 if (declaredFields != null && declaredFields.length != 0) {
10 for (Field item : declaredFields) {
11 if (null != item.getAnnotation(ToStringIgnore.class)) {
12 continue;
13 }
14 item.setAccessible(true);
15 String field = "";
16 try {
17 field = item.getName() + ":" + item.get(o);
18 } catch (IllegalAccessException ignore) {}
19 fields.add(field);
20 }
21 }
22 str += joiner.join(fields) + " \n} ";
23 return str;
24 }
25 }
1 public class User implements Serializable {
2
3 private static final long serialVersionUID = -5334408912188522583L;
4
5 private int id;
6
7 private String username;
8
9 @ToStringIgnore
10 private String password;
11
12 private String firstName;
13
14 private int age;
15
16 private boolean male;
17
18 public User(int id, String username, String password, String firstName, int age, boolean male) {
19 this.id = id;
20 this.username = username;
21 this.password = password;
22 this.firstName = firstName;
23 this.age = age;
24 this.male = male;
25 }
26
27 public int getId() {
28 return id;
29 }
30
31 public void setId(int id) {
32 this.id = id;
33 }
34
35 public String getUsername() {
36 return username;
37 }
38
39 public void setUsername(String username) {
40 this.username = username;
41 }
42
43 public String getPassword() {
44 return password;
45 }
46
47 public void setPassword(String password) {
48 this.password = password;
49 }
50
51 public String getFirstName() {
52 return firstName;
53 }
54
55 public void setFirstName(String firstName) {
56 this.firstName = firstName;
57 }
58
59 public int getAge() {
60 return age;
61 }
62
63 public void setAge(int age) {
64 this.age = age;
65 }
66
67 public boolean isMale() {
68 return male;
69 }
70
71 public void setMale(boolean male) {
72 this.male = male;
73 }
74
75 @Override
76 public String toString() {
77 return "User{" +
78 "id=" + id +
79 ", username='" + username + '\'' +
80 ", password='" + password + '\'' +
81 ", firstName='" + firstName + '\'' +
82 ", age=" + age +
83 ", male=" + male +
84 '}';
85 }
86 }
@Test
public void test() {
String s = ToStringUtils.toString(new User(1, "admin", "admin", "asldas", 1, true));
logger.info("{}", s);
}
