Trace_hs的博客

文件读取与保存 Long startTime=System.currentTimeMillis(); String jsonStr = ""; try { File jsonFile = new File("E:\\json\\"+ "json" + ".json"); FileReader fileReader = new FileReader(jsonFile); Reader reader = new InputStreamReader(new FileInputStre

二进制流与base64位相互转换 base64传到前端需要有文件头来区分 先自己定义一个 /** * 图片base64格式Map */ private static final Map<String, String> DATA_IMAGE_MAP = new HashMap<String, String>() { { put("png", "data:image/png;base64,"); put("jpg", "data:image/jpeg;base6

下载文件 /** * 根据附件信息下载附件 * * @param attachment 附件对象 * @param response 响应对象 * @throws IOException IO流异常 */ public static void download(FbAttachment attachment, HttpServletResponse response) throws IOException { if (null == attachment) { th

springboot中shiro权限控制的使用 先新建一个UserRealm public class UserRealm extends AuthorizingRealm { //授权 @Override protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) { System.out.println("执行了=>Authorizat

springBoot中Security的使用 需要有自动装配 @EnableWebSecurity public class SecurityConfig extends WebSecurityConfigurerAdapter { //链式编程 @Override protected void configure(HttpSecurity http) throws Exception { http.authorizeRequests()

SpringBoot拦截器的使用 新建类继承HandlerInterceptor //拦截器 public class LoginHandlerInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

springBoot的mcv（视图）控制 新建个类，继承WebMvcConfigurer 类名上加注解@Configuration @Configuration public class MyMvcConfig implements WebMvcConfigurer { //视图 @Override public void addViewControllers(ViewControllerRegistry registry) { //当return:“test”时就会跳转到“