为什么我的请求实体InputStream在ContainerRequestFilter(Spring+Jersey）中总是为空

Question

null

<?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>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jersey</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

@Configuration
public class JerseyConfig extends ResourceConfig {
    public JerseyConfig() {
        register(HelloController.class);
        register(MyFilter.class);
    }
}

@Component
@Path("/hello")
public class HelloController {

    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    @POST
    public String onHelloRequest(@FormParam("foo") String foo) {
        System.out.println(foo);
        return foo + "bar";
    }
}

public class MyFilter implements ContainerRequestFilter {

    @Override
    public void filter(ContainerRequestContext ctx) throws IOException {

        System.err.println("I'm in the filter");

        // Solution #1 doesn't work
        if (ctx instanceof ContainerRequest) {
            ContainerRequest request = (ContainerRequest) ctx;

            request.bufferEntity();
            Form f = request.readEntity(Form.class);
            System.err.println(f.asMap().toString());
        }

        // Solution #2 doesn't work either
        InputStream inputStream = ctx.getEntityStream();
        StringBuilder textBuilder = new StringBuilder();
        try (Reader reader = new BufferedReader(new InputStreamReader
                (inputStream, Charset.forName(StandardCharsets.UTF_8.name())))) {
            int c = 0;
            while ((c = reader.read()) != -1) {
                textBuilder.append((char) c);
            }
        }
        System.err.println(textBuilder.toString());
    }
}

Spring-web有没有可能在调用Jersey之前消耗InputStream？

请帮帮我.

编辑

我的回答是

芭芭拉

我的控制台输出是

Answer 1

这里是“解决方案”

在SpringBoot中，如果添加starter-web模块，它将添加spring:webmvc，这似乎与JAXR和Servlet过滤器不兼容。如果您使用SpringBoot和Jersey,请确保webmvc jar不在类路径上。

Spring堆栈将消耗servlet的请求InputStream，管道中的每个下行拦截器/过滤器将一无所获。

public MyFilter implements Filter
{


    @Override
    public final void doFilter(
        final ServletRequest request,
        final ServletResponse response,
        final FilterChain chain)
        throws IOException,
        ServletException {


        getRawFormPayload((HttpServletRequest) request);
        chain.doFilter(request, response);
    }

     protected String getRawFormPayload(HttpServletRequest request) {

        final int contentLength = request.getContentLength();
        final StringBuilder payloadBuilder = new StringBuilder(contentLength);
        try {
            final InputStream inputStream = request.getInputStream();
            final BufferedReader reader =
                new BufferedReader(new InputStreamReader(inputStream, request.getCharacterEncoding()));

            // Buffer should not be higher than the content-length of the request
            reader.mark(contentLength + 1);
            final char[] charBuffer = new char[contentLength + 1];
            int bytesRead = -1;

            while ((bytesRead = reader.read(charBuffer)) > 0) {
                payloadBuilder.append(charBuffer, 0, bytesRead);
            }

            // Reset the buffer so the next Filter/Interceptor have unaltered InputStream
            reader.reset();

        } catch (final IOException e) {
            this.LOG.error(e.getMessage(), e);
        }
        return payloadBuilder.toString();
    }
}