springboot增加过滤器后中文乱码

记录一下小问题

public class RepeatableHttpServletWrapper extends HttpServletRequestWrapper {
    private  byte[] body;

    public RepeatableHttpServletWrapper(HttpServletRequest request) throws IOException  {
        super(request);
        request.setCharacterEncoding("UTF-8");
        BufferedReader reader = request.getReader();
        try (StringWriter writer = new StringWriter()) {
            int read;
            char[] buf = new char[1024];
            while ((read = reader.read(buf)) != -1) {
                writer.write(buf, 0, read);
            }
            this.body = writer.getBuffer().toString().getBytes(StandardCharsets.UTF_8);
        }
    }

    public String getBody(){
        return new String(body, StandardCharsets.UTF_8);
    }

    @Override
    public ServletInputStream getInputStream() {
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body);
        return new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }
            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {
            }

            @Override
            public int read() {
                return byteArrayInputStream.read();
            }
        };
    }
    @Override
    public BufferedReader getReader() {
        return new BufferedReader(new InputStreamReader(this.getInputStream(), StandardCharsets.UTF_8));
    }
}

public class RepeatableWrapperFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        if (servletRequest.getCharacterEncoding() == null) {
            servletRequest.setCharacterEncoding("UTF-8");
        }
        ServletRequest requestWrapper = null;
        if(servletRequest instanceof HttpServletRequest) {
            requestWrapper = new RepeatableHttpServletWrapper((HttpServletRequest) servletRequest);
        }
        if(requestWrapper == null) {
            filterChain.doFilter(servletRequest, servletResponse);
        } else {
            filterChain.doFilter(requestWrapper, servletResponse);
        }
    }

    @Override
    public void destroy() {

    }
}

    @Bean
    public FilterRegistrationBean repeatableWrapperFilter() {
        FilterRegistrationBean<RepeatableWrapperFilter> registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new RepeatableWrapperFilter());
        registrationBean.addUrlPatterns("/*");
        registrationBean.setOrder(1);
        registrationBean.setAsyncSupported(true);
        return registrationBean;
    }

public class DataAuthenticationInterceptor implements HandlerInterceptor {


    private DataAuthenticationService dataAuthenticationService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
         RepeatableHttpServletWrapper repeatableRequest = new RepeatableHttpServletWrapper(request);
         String body = repeatableRequest.getBody();
    }
              

之前做的一个功能需要 通过拦截器前置处理post请求中body的信息，由于body在request中是以流存在的，读完就没有了，所以需要增加一个过滤器来进行前置处理，在处理时候本地是正常的发布linux后出现中文乱码情况

方法1：在启动jvm的参数中增加 -Dfile.encoding=UTF-8

java -jar -Dfile.encoding=UTF-8 jar包

方法2：在xml文件的build标签中增加 jvm参数处理

<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${spring-boot.version}</version>
<configuration>
<fork>true</fork>
<jvmArguments>-Dfile.encoding=UTF-8</jvmArguments>
</configuration>
</plugin>

方法3：处理读写是统一按照 UTF-8 处理

方法4： 增加 CharacterEncodingFilter 过滤器 ，这个过滤器优先级要高于新增的过滤器

@Bean
public FilterRegistrationBean characterEncodingFilter() {
    CharacterEncodingFilter filter = new CharacterEncodingFilter();
    filter.setEncoding("UTF-8");
    filter.setForceEncoding(true);
    FilterRegistrationBean<CharacterEncodingFilter> registrationBean = new FilterRegistrationBean();
    registrationBean.setFilter(filter);
    registrationBean.addUrlPatterns("/*");
    registrationBean.setOrder(0);
    return registrationBean;
}

原文地址：https://blog.csdn.net/weixin_47752736/article/details/140370854

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