Question

我正在尝试使用trinidad fileupload（tr:inputFile）组件将文件上传到服务器，但我得到了

setCharacterEncoding的NullPointerException（UploadRequestWrapper.java：83）

按下commandButton。

我的 XHTML文件包含：

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:tr="http://myfaces.apache.org/trinidad" >
<ui:composition template="/WEB-INF/templates/BasicTemplate.xhtml">

    <ui:define name="content">
        <tr:form usesUpload="true">
            <tr:inputFile label="Upload:" valueChangeListener="#{myBackingBean.fileUploaded}"/>
            <tr:commandButton text="Begin"/>
        </tr:form>
    </ui:define>

    </ui:define>
</ui:composition>
</html>

支持Bean：

import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.event.ValueChangeEvent;
import org.apache.myfaces.trinidad.model.UploadedFile;

public class MyBackingBean{
    ...
    public void fileUploaded(ValueChangeEvent event){
        UploadedFile file = (UploadedFile) event.getNewValue();
        if (file != null){
            FacesContext context = FacesContext.getCurrentInstance();
            FacesMessage message = new FacesMessage(
                "Successfully uploaded file " + file.getFilename() +
                " (" + file.getLength() + " bytes)");
                context.addMessage(event.getComponent().getClientId(context), message);
                // Here's where we could call file.getInputStream()
        }
    }
}

WEB-INF / web.xml文件：

<filter>
    <filter-name>trinidad</filter-name>
    <filter-class>org.apache.myfaces.trinidad.webapp.TrinidadFilter</filter-class
</filter>

<servlet>
    <servlet-name>faces</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
</servlet>

<filter-mapping>
    <filter-name>trinidad</filter-name>
    <servlet-name>faces</servlet-name>
</filter-mapping>

我正在使用：

服务器：Tomcat 7.0.12
MyFaces 2.2.0
Trinidad 2.0.1
JSTL 1.2
适用于Web开发人员的Eclipse Java EE IDE /版本：Kepler Service Release 1

完整输出：

Schwerwiegend: Servlet.service() for servlet [Faces Servlet] in context with path [/com.cargarantie.ws.claimshandler] threw exception [null] with root cause java.lang.NullPointerException
at org.apache.myfaces.trinidadinternal.config.upload.UploadRequestWrapper.setCharacterEncoding(UploadRequestWrapper.java:83)
at org.apache.myfaces.context.servlet.ServletExternalContextImpl.setRequestCharacterEncoding(ServletExternalContextImpl.java:581)
at javax.faces.context.ExternalContextWrapper.setRequestCharacterEncoding(ExternalContextWrapper.java:416)
at javax.faces.context.ExternalContextWrapper.setRequestCharacterEncoding(ExternalContextWrapper.java:416)
at javax.faces.application.ViewHandler.initView(ViewHandler.java:339)
at org.apache.myfaces.application.ViewHandlerImpl.initView(ViewHandlerImpl.java:191)
at javax.faces.application.ViewHandlerWrapper.initView(ViewHandlerWrapper.java:49)
at org.apache.myfaces.lifecycle.RestoreViewExecutor.doPrePhaseActions(RestoreViewExecutor.java:83)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:182)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:143)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:196)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

有什么想法吗？提前谢谢。

Answer 1

我解决了这个问题！

我不知道这种方法是否是解决问题的最佳方法，但它有效。

创建自己的SetCharacterEncodingFilter类并将其添加到构建路径中。 Source:

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class SetCharacterEncodingFilter implements Filter {
    protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;

    @Override
    public void destroy() {

        this.encoding = null;
        this.filterConfig = null;
    }

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

        // Conditionally select and set the character encoding to be used
        if (ignore || (request.getCharacterEncoding() == null)) {
            String characterEncoding = selectEncoding(request);
            if (characterEncoding != null)
                request.setCharacterEncoding(characterEncoding);
        }


        // Pass control on to the next filter
        chain.doFilter(request, response);
        Utilities.ConsoleMsg("Done.", this, "doFilter", 5);
    }

    @Override
    public void init(FilterConfig fConfig) throws ServletException {

        this.filterConfig = fConfig;
        this.encoding = fConfig.getInitParameter("encoding");
        String value = fConfig.getInitParameter("ignore");
        if (value == null)
            this.ignore = true;
        else if (value.equalsIgnoreCase("true"))
            this.ignore = true;
        else if (value.equalsIgnoreCase("yes"))
            this.ignore = true;
        else
            this.ignore = false;
    }

    protected String selectEncoding(ServletRequest request) {
        return (this.encoding);
     }


}

在web.xml中注册Filter并设置init参数。

<filter>
    <filter-name>UTFEncodingFilter</filter-name>
    <filter-class>path.to.your.package.SetCharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
        <param-name>ignore</param-name>
        <param-value>false</param-value>
    </init-param>
</filter>

将URIEncoding="UTF-8"属性添加到server.xml中的所有连接器。例如：

<Connector port="8080"
           protocol="HTTP/1.1"
           connectionTimeout="20000"
           redirectPort="8443"
           URIEncoding="UTF-8" />

<强>来源：

setCharacterEncoding的NullPointerException（UploadRequestWrapper.java：83）

1 个答案: