实现中文UTF8的过滤器

1.过滤器代码：

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package com.yin;   import javax.servlet.*; import java.io.IOException;   public class filter implements Filter {     public void init(FilterConfig filterConfig) throws ServletException {         //初始化         System.out.println("初始化");     }       public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {         servletRequest.setCharacterEncoding("UTF-8");         servletResponse.setCharacterEncoding("UTF-8");         servletResponse.setContentType("text/html;charset=UTF-8");           System.out.println("CharacterEncodingFilter执行前...");         filterChain.doFilter(servletRequest,servletResponse);//让请求继续走，不写程序就停了         System.out.println("CharacterEncodingFilter执行后...");     }       public void destroy() {         //销毁         System.out.println("销毁");     } }

　　2.被转译原文件代码（showsevlet.jsp）

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package com.yin;   import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException;   public class ShowServlet extends HttpServlet {     @Override     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {         resp.getWriter().write("你好");     }       @Override     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {         super.doGet(req, resp);     } }

　　3.web.xml

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<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"          version="4.0">       <servlet>         <servlet-name>image</servlet-name>         <servlet-class>com.yin.ShowServlet</servlet-class>     </servlet>     <servlet-mapping>         <servlet-name>image</servlet-name>         <url-pattern>/i</url-pattern>     </servlet-mapping>       <filter>         <filter-name>filter1</filter-name>         <filter-class>com.yin.filter</filter-class>     </filter>     <filter-mapping>         <filter-name>filter1</filter-name>         <!--只要是servlet的任何请求都会走过滤器-->         <url-pattern>/*</url-pattern>     </filter-mapping> </web-app>

　　4.pom.xml

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<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0"          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">     <modelVersion>4.0.0</modelVersion>       <groupId>org.example</groupId>     <artifactId>javaweb</artifactId>     <version>1.0-SNAPSHOT</version> <dependencies>     <dependency>         <groupId>junit</groupId>         <artifactId>junit</artifactId>         <version>4.12</version>     </dependency>     <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->     <dependency>         <groupId>javax.servlet</groupId>         <artifactId>javax.servlet-api</artifactId>         <version>3.1.0</version>     </dependency>       <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->     <dependency>         <groupId>javax.servlet.jsp</groupId>         <artifactId>javax.servlet.jsp-api</artifactId>         <version>2.3.3</version>     </dependency>       <!-- JSTL表达式依赖 -->     <dependency>         <groupId>javax.servlet.jsp.jstl</groupId>         <artifactId>jstl-api</artifactId>         <version>1.2</version>     </dependency>       <!--  standard标签库-->     <dependency>         <groupId>taglibs</groupId>         <artifactId>standard</artifactId>         <version>1.1.2</version>     </dependency>       <!-- 连接数据库 -->     <dependency>         <groupId>mysql</groupId>         <artifactId>mysql-connector-java</artifactId>         <version>8.0.16</version>     </dependency>     </dependencies>       <!--在build中配置resources，来防止我们资源导出失败的问题-->     <build>         <resources>               <resource>                 <directory>src/main/java</directory><!--设置java目录下的指定文件也会被导出-->                 <includes>                     <include>**/*.properties</include><!--自己指定的文件类型-->                     <include>**/*.xml</include>                 </includes>                 <filtering>true</filtering>             </resource>               <!--系统会自动导出resources中的文件，这个一般不写，如果你的resources中资源也不无法导出，可以试一下把这个加上-->             <resource>                 <directory>src/main/resources</directory>                 <includes>                     <include>**/*.properties</include>                     <include>**/*.xml</include>                 </includes>                 <filtering>true</filtering>             </resource>           </resources>     </build> </project>