11

Java Servlet API 可以将请求转发到同一服务器中的另一个路径（相同的 host:port）。但是，转发到不同的主机：端口——就像代理一样——是另一回事。

我尝试使用 Jersey Client 来做到这一点，将ServletRequest（方法、标头、媒体类型和正文）调整为 Jersey ClientRequest（具有不同的基本 uri），进行调用，然后将 Jersey ClientResponse（方法、标头、 mediatype 和 body - 到ServletResponse。

手动调整这些对我来说似乎是错误的。

没有纯 Servlet API 解决方案吗？还是能够在更改主机：端口时来回调整请求的 HTTP 客户端？

4

3 回答 3

8

HTTP-Proxy-Servlet完全符合您的需要。

快速配置

pom.xml

<dependency>
    <groupId>org.mitre.dsmiley.httpproxy</groupId>
    <artifactId>smiley-http-proxy-servlet</artifactId>
    <version>1.7</version>
</dependency>

web.xml

<servlet>
    <servlet-name>solr</servlet-name>
    <servlet-class>org.mitre.dsmiley.httpproxy.ProxyServlet</servlet-class>
    <init-param>
        <param-name>targetUri</param-name>
        <param-value>http://solrserver:8983/solr</param-value>
    </init-param>
    <init-param>
        <param-name>log</param-name>
        <param-value>true</param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>solr</servlet-name>
    <url-pattern>/solr/*</url-pattern>
</servlet-mapping>

弹簧集成

另请参阅：HTTP-Proxy-Servlet 问题 #15

pom.xml

<dependency>
    <groupId>org.mitre.dsmiley.httpproxy</groupId>
    <artifactId>smiley-http-proxy-servlet</artifactId>
    <version>1.7</version>
</dependency>

ServletWrappingControllerExt.java

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.ServletWrappingController;

public class ServletWrappingControllerExt extends ServletWrappingController
{
    private String  pathToStrip;

    public void setPathToStrip(String pathToStrip)
    {
        this.pathToStrip = pathToStrip;
    }

    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
            throws Exception
    {
        final HttpServletRequest wrapper = new HttpServletRequestWrapper(request)
        {
            @Override
            public String getPathInfo()
            {
                //Please note that getPathInfo returns null if DispatcherServlet is configured to track url-pattern "/"
                //It should be configured to track url-pattern "/*". Below is a sample DispatcherServlet configuration
                /*
                    <servlet>
                        <servlet-name>spring</servlet-name>
                        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
                        <load-on-startup>1</load-on-startup>
                    </servlet>
                    <servlet-mapping>
                        <servlet-name>spring</servlet-name>
                        <url-pattern>/*</url-pattern>
                    </servlet-mapping>
                 */
                String path = super.getPathInfo();                  
                if (path.startsWith(pathToStrip))
                {
                    final int length = pathToStrip.length();
                    path = path.substring(length);
                }
                return path;
            }
            
            @Override
            public String getServletPath()
            {
                return super.getServletPath();
            }
        };

        return super.handleRequestInternal(wrapper, response);
    }
}

豆类配置

<bean id="myServletWrapper" class="ServletWrappingControllerExt">
    <property name="pathToStrip" value="/solr"/>
    <property name="servletClass" value="org.mitre.dsmiley.httpproxy.ProxyServlet" />
    <property name="servletName" value="solr" />
    <property name="initParameters">
        <props>
            <prop key="targetUri">http://solrserver:8983/solr</prop>
            <prop key="log">true</prop>
        </props>
    </property>
</bean>

<bean id="myServletUrlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
    <property name="urlMap">
    <map>
        <entry key="/solr/**" value-ref="myServletWrapper" />
    </map>
    </property>
    <property name="order" value="1" />
</bean>
于 2015-10-17T21:59:18.900 回答
3

你应该使用javax.net.HttpURLConnection

这是它的伪代码：

URL url = new URL("http://otherserver:otherport/url");
HttpURLConnection connection = (HttpURLConnection)url.openConnection();

// set http method if required
connection.setRequestMethod("POST");

// set request header if required
connection.setRequestProperty("header1", "value1");

// check status code
if(connection.getResponseCode() == 200) {

   InputStream is = connection.getInputStream();
   //transfer is to the required output stream
} else {
   //write error
}
于 2012-06-02T08:24:05.730 回答
0

据我了解，您需要request从 Servlet 发送 s 并response从其他服务器获取到您的服务器，可能您需要一个HTTP 客户端（概览）。
这个问题也可能对你有所帮助。

于 2012-06-02T07:44:29.910 回答