新手练习求助~!~Struts2+hibernate+spring上传文件action老是接收null,导致NullPointerException

Question

新手练习求助~~Struts2+hibernate+spring上传文件action老是接收null,导致NullPointerExceptionUserDao.javapublic interface UserDao {
public void sendEmail(Email email) throws IOException;
}
UserDaoImpl.java
public class UserDaoImpl extends HibernateTemplate implements UserDao {
private SessionFactory sessionFactory;
private Email email;
private File file;
public File getFile() {
return file;
} public void setFile(File file) {
this.file = file;
} public Email getEmail() {
return email;
} public void setEmail(Email email) {
this.email = email;
}
public SessionFactory getSessionFactory() {
return sessionFactory;
} public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
public void sendEmail(Email email) throws IOException{
Session session = sessionFactory.openSession();
FileInputStream in = new FileInputStream(getFile());
byte[] buffer =  new byte[in.available()];
in.read(buffer);


Transaction ts = session.beginTransaction();
email.setImage(Hibernate.createBlob(buffer));
session.merge(email);
in.close();
ts.commit();
session.close();

}
}
/*********************/
LoginAction.java
public class LoginAction extends ActionSupport {
private UserDao userDao;
private Email email;
public UserDao getUserDao() {
return userDao;
}
        public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
public Email getEmail() {
return email;
} public void setEmail(Email email) {
this.email = email;
} public String sendEmail() throws IOException{
this.userDao.sendEmail(email);
return "success";
}

}
/**************************/
Email.javapublic class Email {
private long id;
private String title;
private String context;
private String receiveuser;
private String senduser;
private Blob image;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public Blob getImage() {
return image;
}
public void setImage(Blob image) {
this.image = image;
}
public String getSenduser() {
return senduser;
}
public void setSenduser(String senduser) {
this.senduser = senduser;
}

public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContext() {
return context;
}
public void setContext(String context) {
this.context = context;
}
public String getReceiveuser() {
return receiveuser;
}
public void setReceiveuser(String receiveuser) {
this.receiveuser = receiveuser;
}
}
Email.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping>
<class name="com.lucas.po.Email" table="EMAIL">
<id name="id" type="long">
<column name="ID" precision="22" scale="0" />
<generator class="native" />
</id>
<property name="title" type="java.lang.String">
<column name="TITLE" length="20" />
</property> <property name="context" type="java.lang.String">
<column name="CONTEXT" length="100" />
</property>

<property name="receiveuser" type="java.lang.String">
<column name="RECEIVEUSER" length="20" />
</property>

<property name="senduser" type="java.lang.String">
<column name="SENDUSER" length="20" />
</property>

<property name="image" type="java.sql.Blob">
            <column name="IMAGE" />
        </property>

</class>
</hibernate-mapping>applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd"> <bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName">
<value>oracle.jdbc.driver.OracleDriver</value>
</property>
<property name="url">
<value>jdbc:oracle:thin:@localhost:12521:xe</value>
</property>
<property name="username">
<value>x5sys</value>
</property>
<property name="password">
<value>x5</value>
</property>
</bean> <bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property> <property name="mappingResources">
<list>
<value>com/lucas/po/User.hbm.xml</value>
<value>com/lucas/po/Email.hbm.xml</value>
</list>
</property> </bean> <bean id="userDao" class="com.lucas.daoImpl.UserDaoImpl">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean> <bean id="LoginAction" class="com.lucas.action.LoginAction">
<property name="userDao">
<ref bean="userDao" />
</property>
</bean>
</beans>struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>
<constant name="struts.objectFactory" value="spring"/>
<constant name="struts.devMode" value="true" />
    <package name="login" extends="struts-default">
        <action name="login" class="LoginAction">
            <result>/index.jsp</result>
            <result name="fail">/login.jsp</result>
        </action>
        
        <action name="update" class="LoginAction" method="update">
<result name="success">/index.jsp</result>
        </action>
        
        <action name="queryAll" class="LoginAction" method="queryAll">
<result name="success">/email.jsp</result>
        </action>
        
        <action name="sendEmail" class="LoginAction" method="sendEmail">
<result name="success">/email.jsp</result>
        </action>
        
    </package>
</struts>email.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>email page</title>
    
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">  </head>
  
  <body>
   <s:form action="sendEmail" method="post" enctype="multipart/form-data">
<s:select list="users" listValue="username" listKey="username" name="email.receiveuser" label="收件人"/>
<s:textfield name="email.title" label="标题"/>
<s:textarea name="email.context" label="正文" rows="10"/>
<input name="email.senduser" value="${user.username}" type="hidden"/>
<s:file name="file" label="附件"></s:file>
   <s:submit value="summit"/>
   </s:form>
  
  </body>
</html>完全求救啊,谁能帮我看看是不是我哪里弄错了,按道理应该action怎么也接收一下嘛,但是老是null,困扰死了

Answer 1

你那个File对象的注入，是不是应该写到action中呢，另外FileInputStream in = new FileInputStream(getFile());
byte[] buffer =  new byte[in.available()];
in.read(buffer);struts2上传文件需要这样写吗？
看了好半天代码，没看出其他猫腻

Answer 2

你不会用struts上传文件，自己搜一下。

Answer 3

public class UploadAction extends ActionSupport{
/**
 * 文件上传的3个文件属性,文件，名称，类型，
 */
private File[] face;
private String faceFileName;
private String faceContentType;
//图片绝对路径
        private String path;
    
@Override
public String execute() throws Exception {
String filename = "";
// 得到文件的绝对路径
String realpath = ServletActionContext.getServletContext().getRealPath(
"/upload");
// 封装上传文件
File file = new File(realpath);
for (int i = 0; i < face.length; i++) {
System.out.println(realpath + "----" + faceContentType);
// 为防止文件同名，加上时间戳
String time = String.valueOf(System.nanoTime());
// 文件后缀名.jpg/.txt...等等
String format = faceFileName.substring(faceFileName.lastIndexOf("."));
// 组装得到独一无二的文件名
filename = time + format;
// 替换名称uploadImageFileName
FileUtils.copyFile(face[i], new File(file, filename));
}
        this.path = realpath+"\\"+filename;
        System.out.println(path);
        //用Session存放服务器端图片的路径
        ActionContext ac=ActionContext.getContext();
ac.getSession().put("face",path);
return SUCCESS;
}
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
public File[] getFace() {
return face;
}
public void setFace(File[] face) {
this.face = face;
}
public String getFaceFileName() {
return faceFileName;
}
public void setFaceFileName(String faceFileName) {
this.faceFileName = faceFileName;
}
public String getFaceContentType() {
return faceContentType;
}
public void setFaceContentType(String faceContentType) {
this.faceContentType = faceContentType;
}
}struts.xml配置：<!-- 头像上传 -->
<action name="upload" class="com.chinasoft.action.UploadAction">
<interceptor-ref name="fileUpload">
<param name="allowedTypes"> image/bmp,image/png,image/gif,image/jpeg,image/jpg,image/pjpeg,image/x-png</param>
<param name="maximumSize">20000000000</param>
</interceptor-ref>
<interceptor-ref name="defaultStack" />
<result name="success">/index.jsp</result>
<result name="input">/error.jsp</result>
</action>

Answer 4

不是吧，我有测试 不封装 contentType  也可以的捏...

Answer 5

问题已经解决,单个File 其实是可以的,搞到最后原来是我的odbc14.jar版本不合适,我泪奔

Answer 6

用action中的  file  查看一下对象。  断点调试啊

Answer 7

jsp页面
<input type="file" name="image">
                action直接写
    private File image;   //image要跟页面上传文件处的name一致
    private String imageFileName;
    private String imageContentType;然后get，set这3个属性就能获取到了