关于苏宁易购网站建设的不足之处,网络文明安全行动,网站开发怎么才能接到私活,深圳网站建设推广优化seojackson是springboot中集成的序列化方式#xff0c;是默认的json序列化方式#xff0c;当然你可以使用其它的序列化工具代替它#xff0c;不过今天我们还是说一下它#xff0c;使用jackson进行序列化一个类#xff0c;然后再把它的JSON字符反序列化为它的接口对象。现实这…jackson是springboot中集成的序列化方式是默认的json序列化方式当然你可以使用其它的序列化工具代替它不过今天我们还是说一下它使用jackson进行序列化一个类然后再把它的JSON字符反序列化为它的接口对象。现实这种方式默认是不行的因为接口不能被自动实例化使用redisTelmplete时如果使用objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);这种试序列化由于会把实例类型写到时 JSON里所以也不能反序列化为接口几个序列化方式一 序列化为具体类型无法反序列化接口即你用什么类型序列化的就用什么类型反序列化它经常与redis的序列化Jackson2JsonRedisSerializer一起使用。ObjectMapper om new ObjectMapper();om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);User user new User();user.setUsername(lind);user.setEmail(zzlsina.com);String msg om.writeValueAsString(user);结果[com.lind.common.JacksonTest$User,{username:lind,email:zzlsina.com,authorities:null}]二 序列化为字符串主要好处是与类型无关只要字段可以配置上就可以反序列化并且在自定义序列化器定义之后还可以对接口类型进行反序列化可以说更加方便。定义一个序列化器public static class DefaultResourceUserSerializer extends JsonDeserializer {Overridepublic DefaultResourceUser deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)throws IOException {ObjectCodec oc jsonParser.getCodec();JsonNode node oc.readTree(jsonParser);DefaultResourceUser userAccountAuthentication new DefaultResourceUser() {Overridepublic String getUsername() {return node.get(username).asText();}Overridepublic String getEmail() {return node.get(email).asText();}Overridepublic Collection extends GrantedAuthority getAuthorities() {List simpleGrantedAuthorities new ArrayList();Iterator elements node.get(authorities).elements();while (elements.hasNext()) {JsonNode next elements.next();JsonNode authority next.get(authority);simpleGrantedAuthorities.add(new SimpleGrantedAuthority(authority.asText()));}return simpleGrantedAuthorities;}};return userAccountAuthentication;}在接口上使用它JsonDeserialize(using DefaultResourceUserSerializer.class)public interface DefaultResourceUser {String getUsername();String getEmail();Collection extends GrantedAuthority getAuthorities();}代码展现了反序列化一个json字符串json{id: 347214418355949568,username: admin,password: {bcrypt}$2a$10$tVrm4VjC9BXF8PStUASZkOJCOm7mKR4ZVDHau.Ug/tm6ZEXEsHhcC,nickName: 测试,mobile: ,email: ,address: 北京,street: ,sex: 0,passStrength: ,avatar: ,type: 0,status: 0,description: ,departmentId: ,departmentTitle: null,resourcePermissions: [{id: 348193374957735936,title: 系统管理,path: ,type: 0,parentId: ,parent: null,sons: null}, {id: 348193687223668737,title: 用户管理,path: /user,type: 0,parentId: 348193374957735936,parent: null,sons: null}, {id: 348193868908335105,title: 添加用户,path: /user/add,type: 0,parentId: 348193687223668737,parent: null,sons: null}, {id: 348193927590842369,title: 用户列表,path: /user/list,type: 0,parentId: 348193687223668737,parent: null,sons: null}, {id: 348194428344602626,title: 权限管理,path: /permission/**,type: 0,parentId: 348193374957735936,parent: null,sons: null}, {id: 348194428344602627,title: 权限添加,path: /permission/add*,type: 0,parentId: 348194428344602626,parent: null,sons: null}, {id: 348194428344602628,title: 角色管理,path: /role/list,type: 0,parentId: 348193374957735936,parent: null,sons: null}, {id: 348194428344602629,title: demo,path: /demo,type: 0,parentId: 348193374957735936,parent: null,sons: null}],resourceRoles: null,enabled: true,authorities: [{authority: 用户管理}, {authority: 添加用户}, {authority: 用户列表}, {authority: 权限管理}, {authority: 权限添加}, {authority: 角色管理}, {authority: demo}],accountNonLocked: true,accountNonExpired: true,credentialsNonExpired: true}代码SneakyThrowsTestpublic void stringJackson() {DefaultResourceUser user fromJson(jack.json, DefaultResourceUser.class);log.info(user:{}, user.getUsername());for (GrantedAuthority grantedAuthority : user.getAuthorities()) {log.info(auth:{}, grantedAuthority.getAuthority());}}结果[1](https://img2020.cnblogs.com/blog/118538/202012/118538-20201209203450087-419672723.png)
