添加国际化支持

1. 配置 locale

spring:
  web:
    locale: zh
    locale-resolver: accept_header

spring boot 默认使用 AcceptHeaderLocaleResolver 支持国际化。

2. 在 /src/main/resources 源文件夹下创建以下文件：

• messages.properties

  license.create.message=%s
  license.update.message=%s
  license.delete.message=%s, %s

• messages_en.properties

  license.create.message=License created %s
  license.update.message=License %s updated
  license.delete.message=Deleting license with id %s for the organization %s

• messages_zh.properties

  license.create.message=许可证 %s 被创建
  license.update.message=许可证 %s 被更新
  license.delete.message=删除组织 %s 下的id为 %s 的许可证

3. 修改 Controller

@PostMapping
public String createLicense(
        @PathVariable("organizationId") String organizationId,
        @RequestBody License license) {
    return licenseService.createLicense(license, organizationId);
}

@PutMapping
public String updateLicense(
        @PathVariable("organizationId") String organizationId,
        @RequestBody License license) {
    return licenseService.updateLicense(license, organizationId);
}

@DeleteMapping
public String deleteLicense(
        @PathVariable("organizationId") String organizationId,
        @PathVariable("licenseId") String licenseId) {
    return licenseService.deleteLicense(licenseId, organizationId);
}

4. 修改 Service 接口和实现

@Autowired
private MessageSource messageSource;

public String createLicense(License license, String organizationId) {
    String responseMessage = null;
    if (license != null) {
        license.setOrganizationId(organizationId);
        responseMessage = String.format(
                messageSource.getMessage("license.create.message", null, LocaleContextHolder.getLocale()),
                license);
    }
    return responseMessage;
}

public String updateLicense(License license, String organizationId) {
    String responseMessage = null;
    if (license != null) {
        license.setOrganizationId(organizationId);
        responseMessage = String.format(
                messageSource.getMessage("license.update.message", null, LocaleContextHolder.getLocale()),
                license);
    }
    return responseMessage;
}

public String deleteLicense(String licenseId, String organizationId) {
    return String.format(
            messageSource.getMessage("license.delete.message", null, LocaleContextHolder.getLocale()),
            licenseId,
            organizationId);

}

5. 测试

国际化的关键在于 Accept-Language 请求头！