请求(doFilter)与响应乱码(BaseController+自定义注解@ContentType(““))集中处理

此时不修改编码格式的话&＃xff0c;tomcat默认是按照_{编码的&＃xff0c;不是utf-8&＃xff0c;这样的数据写进数据库就是乱码啦呱}~

//浏览器发来服务器消息进行重新编码的编码。
request.setCharacterEncoding("utf-8");


1.1EncodingFilter.java代码

&＃64;WebFilter("/*")
public class EncodingFilter implements Filter {&＃64;Overridepublic void init(FilterConfig filterConfig) throws ServletException {}&＃64;Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {HttpServletRequest request &＃61;(HttpServletRequest) servletRequest;request.setCharacterEncoding("utf-8");filterChain.doFilter(request,servletResponse);}&＃64;Overridepublic void destroy() {}
}

2.服务器向浏览器发送消息&＃xff1a;response&＃xff0c;使用BaseController进行判断方法是否被自定义注解修饰&＃xff1a;设置resp.setContentType(“text/html;charset&＃61;utf-8”);

//对服务器发送浏览器消息&＃xff1a;用于定义网络文件bai的类型和网页的编码&＃xff0c;决定浏览器du将以什么zhi形式、什么编码读取这个文件
resp.setContentType("text/html;charset&＃61;utf-8");


2.1自定义注解ContentType 代码

//详情请见&＃xff1a;
https://blog.csdn.net/qq_39773004/article/details/108661464?ops_request_misc&＃61;%257B%2522request%255Fid%2522%253A%2522160048748919725247415269%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id&＃61;160048748919725247415269&biz_id&＃61;0&utm_medium&＃61;distribute.pc_search_result.none-task-blog-2~blog~first_rank_v2~rank_blog_default-1-108661464.pc_v2_rank_blog_default&utm_term&＃61;%E8%87%AA%E5%AE%9A%E4%B9%89%E6%B3%A8%E8%A7%A3&spm&＃61;1018.2118.3001.4187


&＃64;Retention(RetentionPolicy.RUNTIME) //被反射读取到 class
&＃64;Target(ElementType.METHOD) //应用到方法上public &＃64;interface ContentType {String value();int id() default 1;String name() default "Ellie";
}


2.2BaseController代码

public class BaseController extends HttpServlet {&＃64;Overrideprotected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {if (method.isAnnotationPresent(ContentType.class)){ContentType contentType &＃61; method.getAnnotation(ContentType.class);String type &＃61; contentType.value();//image/jpeg application/json;charset&＃61;utf-8resp.setContentType(type);}else{resp.setContentType("text/html;charset&＃61;utf-8");}}
}