GzipOutputStream是finish而不是flush

GzipOutputStream是finish而不是flush
可以通过使用Spring Boot中的过滤器(Filter)来实现请求响应的压缩。具体步骤如下: 1. 在pom.xml中添加以下依赖: ```xml <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.github.ziplet</groupId> <artifactId>ziplet-filter-servlet</artifactId> <version>2.1.2</version> </dependency> ``` 2. 在application.properties文件中添加以下配置: ```properties server.compression.enabled=true server.compression.mime-types=application/json,application/xml,text/html,text/plain server.compression.min-response-size=1024 ``` 其中,`server.compression.enabled`表示是否启用压缩,`server.compression.mime-types`表示需要压缩的内容类型,`server.compression.min-response-size`表示响应内容超过多少字节才压缩。 3. 创建一个过滤器类并实现Filter接口: ```java public class CompressionFilter implements Filter { @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpRequest = (HttpServletRequest) request; HttpServletResponse httpResponse = (HttpServletResponse) response; if (isGzipSupported(httpRequest) && notAlreadyCompressed(httpResponse)) { GZIPResponseWrapper gzipResponse = new GZIPResponseWrapper(httpResponse); chain.doFilter(request, gzipResponse); gzipResponse.finish(); return; } chain.doFilter(request, response); } private boolean isGzipSupported(HttpServletRequest request) { String encoding = request.getHeader("Accept-Encoding"); return (encoding != null && encoding.contains("gzip")); } private boolean notAlreadyCompressed(HttpServletResponse response) { return (response.getHeader("Content-Encoding") == null); } // GZIPResponseWrapper类是对HttpServletResponse进行封装,实现GZIP压缩 private static class GZIPResponseWrapper extends HttpServletResponseWrapper { private GZIPOutputStream gzipOutputStream; public GZIPResponseWrapper(HttpServletResponse response) throws IOException { super(response); this.gzipOutputStream = new GZIPOutputStream(response.getOutputStream()); } @Override public ServletOutputStream getOutputStream() throws IOException { return new ServletOutputStream() { @Override public void write(int b) throws IOException { gzipOutputStream.write(b); } @Override public void flush() throws IOException { gzipOutputStream.flush(); super.flush(); } @Override public void close() throws IOException { gzipOutputStream.close(); super.close(); } }; } @Override public PrintWriter getWriter() throws IOException { return new PrintWriter(new OutputStreamWriter(gzipOutputStream, getResponse().getCharacterEncoding())); } } } ``` 4. 在Spring Boot应用程序的配置类中添加一个FilterRegistrationBean,将上述过滤器类注册为过滤器: ```java @Configuration public class WebConfig { @Bean public FilterRegistrationBean<CompressionFilter> compressionFilter() { FilterRegistrationBean<CompressionFilter> registrationBean = new FilterRegistrationBean<>(); registrationBean.setFilter(new CompressionFilter()); registrationBean.addUrlPatterns("/*"); return registrationBean; } } ``` 完成以上步骤后,请求响应的内容会被自动压缩。
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