SSH整合时出现的InvocationTargetException问题及实例讲解

 今天参考师兄的一个项目来做了一下SSH整合的实验，不过师兄用的是注解的方式，由于本人水平有限，还是用配置文件来的，然后一不留神就出现了下面的问题：

先说明一下实验项目的分层：实体Po、接口Dao、接口实现Impl、业务Service、表单封装Dto、Action；如下图：

本来之前实验的时候都是在Action层直接使用Impl的，不过参考了师兄的项目增加了一个Service层，直接在Service层里面使用Dao，额，这个应该对老手来说是理所当然的；不过在本人实验的过程中遇到了一个很纠结的问题：

Debug的时候在Service里面调用到Dao方法时就会跳到了下面这个方法这里：

1. public InvocationTargetException(Throwable target) {  
2.     super((Throwable)null);  // Disallow initCause  
3.         this.target = target;  
4.     }  

在网上查了好久，大致了解是配置文件的问题，然后就以配置文件为切入点寻找问题；不过查看了好久，貌似配置文件是没有什么问题的

一开始我是这样配置的：

<bean id="SecHandDaoImpl" class="org.sip.dao.impl.SecHandDaoImpl"><property name="sessionFactory" ref="sessionFactory" /></bean><bean id="SecHandService" class="org.sip.service.SecHandService"></bean><bean id="SecHandAction" scope="prototype" class="org.sip.action.SecHandAction"><property name="secHandService" ref="SecHandService" /></bean>

 

 

问题就出现在了红色标识的地方，因为Service里面只有Dao接口，所以在上面红色这里就不知道怎么注入了，所以尝试了好多方式都没有问题，后来找书看了一下里面的例子讲解，终于解决问题：

<bean id="SecHandService" class="org.sip.service.SecHandService">
<property name="secHandDao" ref="SecHandDaoImpl"></property>
</bean>

这里的secHandDao就是Service里面的使用的接口，SecHandDaoImpl 为接口的实现（这个要先装配好），然后问题就解决了

想了一下，还是基础不太扎实，以后得加强一下先，也应该使用注解来开发了，配置文件的话感觉太臃肿了；

下面贴一下完整的代码：（现在一个练习项目，这里的主要功能是将一些信息添加到数据库：这里使用MySQL）

（1）Po和映射文件（这个个人比较懒都是用Hibernate逆向工程来生成的）：

package org.sip.po;/** * SecHand entity. @author MyEclipse Persistence Tools */public class SecHand  implements java.io.Serializable {    // Fields         private Integer sechandId;     private User user;     private String sechandName;     private String sechandContent;     private String sechandNewsold;     private String sechandPriceRegion;     private String  sechandPrice;     private String sechandPicture;     private String sechandDate;     private String sechandType;     private String sechandAuPhone;     private String sechandCollege;     private String sechandCampus;     private String sechandPersonIdentity;     private String sechandOthers;    // Constructors    /** default constructor */    public SecHand() {    }/** minimal constructor */    public SecHand(User user, String sechandName, String sechandContent, String sechandNewsold, String sechandPriceRegion, String sechandPrice, String sechandPicture, String sechandDate, String sechandType, String sechandAuPhone, String sechandCollege, String sechandCampus, String sechandPersonIdentity) {        this.user = user;        this.sechandName = sechandName;        this.sechandContent = sechandContent;        this.sechandNewsold = sechandNewsold;        this.sechandPriceRegion = sechandPriceRegion;        this.sechandPrice = sechandPrice;        this.sechandPicture = sechandPicture;        this.sechandDate = sechandDate;        this.sechandType = sechandType;        this.sechandAuPhone = sechandAuPhone;        this.sechandCollege = sechandCollege;        this.sechandCampus = sechandCampus;        this.sechandPersonIdentity = sechandPersonIdentity;    }        /** full constructor */    public SecHand(User user, String sechandName, String sechandContent, String sechandNewsold, String sechandPriceRegion, String sechandPrice, String sechandPicture, String sechandDate, String sechandType, String sechandAuPhone, String sechandCollege, String sechandCampus, String sechandPersonIdentity, String sechandOthers) {        this.user = user;        this.sechandName = sechandName;        this.sechandContent = sechandContent;        this.sechandNewsold = sechandNewsold;        this.sechandPriceRegion = sechandPriceRegion;        this.sechandPrice = sechandPrice;        this.sechandPicture = sechandPicture;        this.sechandDate = sechandDate;        this.sechandType = sechandType;        this.sechandAuPhone = sechandAuPhone;        this.sechandCollege = sechandCollege;        this.sechandCampus = sechandCampus;        this.sechandPersonIdentity = sechandPersonIdentity;        this.sechandOthers = sechandOthers;    }       // Property accessors    public Integer getSechandId() {        return this.sechandId;    }        public void setSechandId(Integer sechandId) {        this.sechandId = sechandId;    }    public User getUser() {        return this.user;    }        public void setUser(User user) {        this.user = user;    }    public String getSechandName() {        return this.sechandName;    }        public void setSechandName(String sechandName) {        this.sechandName = sechandName;    }    public String getSechandContent() {        return this.sechandContent;    }        public void setSechandContent(String sechandContent) {        this.sechandContent = sechandContent;    }    public String getSechandNewsold() {        return this.sechandNewsold;    }        public void setSechandNewsold(String sechandNewsold) {        this.sechandNewsold = sechandNewsold;    }    public String getSechandPriceRegion() {        return this.sechandPriceRegion;    }        public void setSechandPriceRegion(String sechandPriceRegion) {        this.sechandPriceRegion = sechandPriceRegion;    }    public String getSechandPrice() {        return this.sechandPrice;    }        public void setSechandPrice(String sechandPrice) {        this.sechandPrice = sechandPrice;    }    public String getSechandPicture() {        return this.sechandPicture;    }        public void setSechandPicture(String sechandPicture) {        this.sechandPicture = sechandPicture;    }    public String getSechandDate() {        return this.sechandDate;    }        public void setSechandDate(String sechandDate) {        this.sechandDate = sechandDate;    }    public String getSechandType() {        return this.sechandType;    }        public void setSechandType(String sechandType) {        this.sechandType = sechandType;    }    public String getSechandAuPhone() {        return this.sechandAuPhone;    }        public void setSechandAuPhone(String sechandAuPhone) {        this.sechandAuPhone = sechandAuPhone;    }    public String getSechandCollege() {        return this.sechandCollege;    }        public void setSechandCollege(String sechandCollege) {        this.sechandCollege = sechandCollege;    }    public String getSechandCampus() {        return this.sechandCampus;    }        public void setSechandCampus(String sechandCampus) {        this.sechandCampus = sechandCampus;    }    public String getSechandPersonIdentity() {        return this.sechandPersonIdentity;    }        public void setSechandPersonIdentity(String sechandPersonIdentity) {        this.sechandPersonIdentity = sechandPersonIdentity;    }    public String getSechandOthers() {        return this.sechandOthers;    }        public void setSechandOthers(String sechandOthers) {        this.sechandOthers = sechandOthers;    }   }

 

 

映射文件

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><!-- Mapping file autogenerated by MyEclipse Persistence Tools --><hibernate-mapping><class name="org.sip.po.SecHand" table="t_sechand" catalog="gxnusip"><id name="sechandId" type="java.lang.Integer"><column name="sechand_id" /><generator class="identity" /></id><many-to-one name="user" class="org.sip.po.User" fetch="select"><column name="sechand_writter_id" not-null="true" /></many-to-one><property name="sechandName" type="java.lang.String"><column name="sechand_name" not-null="true" /></property><property name="sechandContent" type="java.lang.String"><column name="sechand_content" not-null="true" /></property><property name="sechandNewsold" type="java.lang.String"><column name="sechand_newsold" not-null="true" /></property><property name="sechandPriceRegion" type="java.lang.String"><column name="sechand_price_region" not-null="true" /></property><property name="sechandPrice" type="java.lang.String"><column name="sechand_price" not-null="true" /></property><property name="sechandPicture" type="java.lang.String"><column name="sechand_picture" not-null="false" /></property><property name="sechandDate" type="java.lang.String"><column name="sechand_date" not-null="true" /></property><property name="sechandType" type="java.lang.String"><column name="sechand_type" not-null="true" /></property><property name="sechandAuPhone" type="java.lang.String"><column name="sechand_au_phone" not-null="true" /></property><property name="sechandCollege" type="java.lang.String"><column name="sechand_college" not-null="true" /></property><property name="sechandCampus" type="java.lang.String"><column name="sechand_campus" not-null="true" /></property><property name="sechandPersonIdentity" type="java.lang.String"><column name="sechand_person_identity" not-null="true" /></property><property name="sechandOthers" type="java.lang.String"><column name="sechand_others" /></property></class></hibernate-mapping>

 

 

 

（2）Dao

package org.sip.dao;import org.sip.po.SecHand;public interface SecHandDao { public boolean addSecHand(SecHand secHand);}

（3）DaoImpl

package org.sip.dao.impl;import java.sql.SQLException;import java.util.List;import org.hibernate.HibernateException;import org.hibernate.Query;import org.hibernate.Session;import org.sip.dao.SecHandDao;import org.sip.po.SecHand;import org.springframework.orm.hibernate3.HibernateCallback;import org.springframework.orm.hibernate3.HibernateTemplate;import org.springframework.orm.hibernate3.support.HibernateDaoSupport;import org.springframework.stereotype.Component;public class SecHandDaoImpl extends HibernateDaoSupport implements SecHandDao {@Overridepublic boolean addSecHand(SecHand secHand) {// TODO Auto-generated method stubtry{getHibernateTemplate().save(secHand);System.out.println("二手信息添加成功");return true;}catch(RuntimeException re){System.out.println("二手信息添加失败"+re.toString());return false;}}@SuppressWarnings("rawtypes")@Overridepublic List findSecHand(final String queryString, final int pageNumber, final int pageSize) {// TODO Auto-generated method stubtry{return (List) getHibernateTemplate().executeFind(new HibernateCallback(){public Object doInHibernate(Session s) throws HibernateException, SQLException{   Query query=s.createQuery(queryString);query.setFirstResult((pageNumber-1)*pageSize);query.setMaxResults(pageSize);List list= query.list();return list;}});}catch (RuntimeException re){throw re;}}@SuppressWarnings("rawtypes")@Overridepublic List findAllSecHand(int pageNumber, int pageSize) {// TODO Auto-generated method stubString queryString="from SecHand";return findSecHand(queryString, pageNumber,pageSize);}}

（4）Service

package org.sip.service;import java.util.List;import org.sip.dao.SecHandDao;import org.sip.po.SecHand;public class SecHandService {private SecHandDao secHandDao;public SecHandDao getSecHandDao() {return secHandDao;}public void setSecHandDao(SecHandDao secHandDao) {this.secHandDao = secHandDao;}public void addSecHand(SecHand secHand){System.out.print("Service:"+secHand.getSechandName());//boolean bool=secHandDao.addSecHand(secHand);secHandDao.addSecHand(secHand);//System.out.print("SUCCESS");}public List findAllSecHand(int pageNumber, int pageSize){return secHandDao.findAllSecHand(pageNumber, pageSize);}}

 （5）DTO

package org.sip.dto;import org.sip.po.SecHand;public class SecHandAuthorization {private String sechandName;private String sechandContent;private String sechandNewsold;private String sechandPriceRegion;private String sechandPrice;//private String sechandPicture;private String sechandType;private String sechandAuPhone;private String sechandCollege;private String sechandCampus;private String sechandPersonIdentity;private String sechandOthers;//private File sechandPicture;//第几页private int page;public String getSechandName() {return sechandName;}public void setSechandName(String sechandName) {this.sechandName = sechandName;}public String getSechandContent() {return sechandContent;}public void setSechandContent(String sechandContent) {this.sechandContent = sechandContent;}public String getSechandNewsold() {return sechandNewsold;}public void setSechandNewsold(String sechandNewsold) {this.sechandNewsold = sechandNewsold;}public String getSechandPriceRegion() {return sechandPriceRegion;}public void setSechandPriceRegion(String sechandPriceRegion) {this.sechandPriceRegion = sechandPriceRegion;}public String getSechandPrice() {return sechandPrice;}public void setSechandPrice(String sechandPrice) {this.sechandPrice = sechandPrice;}public String getSechandType() {return sechandType;}public void setSechandType(String sechandType) {this.sechandType = sechandType;}public String getSechandAuPhone() {return sechandAuPhone;}public void setSechandAuPhone(String sechandAuPhone) {this.sechandAuPhone = sechandAuPhone;}public String getSechandCollege() {return sechandCollege;}public void setSechandCollege(String sechandCollege) {this.sechandCollege = sechandCollege;}public String getSechandCampus() {return sechandCampus;}public void setSechandCampus(String sechandCampus) {this.sechandCampus = sechandCampus;}public String getSechandPersonIdentity() {return sechandPersonIdentity;}public void setSechandPersonIdentity(String sechandPersonIdentity) {this.sechandPersonIdentity = sechandPersonIdentity;}public String getSechandOthers() {return sechandOthers;}public void setSechandOthers(String sechandOthers) {this.sechandOthers = sechandOthers;}public void setPage(int page) {this.page = page;}public SecHand getSecHand(){SecHand secHand=new SecHand();secHand.setSechandName(sechandName);secHand.setSechandContent(sechandContent);secHand.setSechandPersonIdentity(sechandPersonIdentity);secHand.setSechandType(sechandType);secHand.setSechandNewsold(sechandNewsold);secHand.setSechandPriceRegion(sechandPriceRegion);secHand.setSechandPrice(sechandPrice);//secHand.setSechandPicture(sechandPicture);secHand.setSechandCollege(sechandCollege);secHand.setSechandCampus(sechandCampus);secHand.setSechandAuPhone(sechandAuPhone);if(sechandOthers!=null){secHand.setSechandOthers(sechandOthers);}return secHand;}public int getPage(){return page;}}

 

 

（5）Action

package org.sip.action;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.text.SimpleDateFormat;import java.util.Date;import java.util.List;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import org.apache.struts2.interceptor.SessionAware;import org.sip.dto.SecHandAuthorization;import org.sip.po.SecHand;import org.sip.po.User;import org.sip.service.SecHandService;import com.opensymphony.xwork2.ModelDriven;public class SecHandAction implements SessionAware,ModelDriven<SecHandAuthorization> {private SecHandAuthorization secHandAuthorization = new SecHandAuthorization();private SecHandService secHandService;private Map<String, Object> session;private String sechand_result = "";private File picture;private String pictureContentType;// 上传文件的类型private String pictureFileName; // 上传文件名private String savePath; // 文件保存路径public SecHandAuthorization getSecHandAuthorization() {return secHandAuthorization;}public void setSecHandAuthorization(SecHandAuthorization secHandAuthorization) {this.secHandAuthorization = secHandAuthorization;}public void setSecHandService(SecHandService secHandService) {this.secHandService = secHandService;}@Overridepublic SecHandAuthorization getModel() {// TODO Auto-generated method stubreturn secHandAuthorization;}// addSecHandpublic String addSecHand() throws Exception {String picture_name = null;if (picture.length() != 0) { picture_name= getSavePath() + "\\" + getPictureFileName();FileOutputStream fileOutputStream = new FileOutputStream(picture_name);FileInputStream fileInputputStream = new FileInputStream(getPicture());int len = 0;byte[] b = new byte[1024];while ((len = fileInputputStream.read(b)) > 0) {fileOutputStream.write(b, 0, len);}}String curdate = "";Date dt = new Date(); // 获取当前系统时间，作为发布时间SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); // 日期格式curdate = sdf.format(dt);HttpServletRequest request = ServletActionContext.getRequest();HttpSession session = request.getSession();int userId = (Integer) session.getAttribute("userId");// UserUser user = new User();user.setUserId(userId);SecHand secHand = new SecHand();secHand = secHandAuthorization.getSecHand();// 图片保存路径secHand.setSechandPicture(picture_name);// 发布者secHand.setUser(user);// 发布时间secHand.setSechandDate(curdate);secHandService.addSecHand(secHand);sechand_result = "/findAllSecHandAction.action";return "sechand_add";}// findSecHandpublic String findAllSecHand() {System.out.println("页数" + secHandAuthorization.getPage());List seclist = secHandService.findAllSecHand(secHandAuthorization.getPage(), 15);// 放入sessionsession.put("seclist", seclist);// sechand_result="sechand_findall";return "sechand_findall";}@Overridepublic void setSession(Map<String, Object> arg0) {// TODO Auto-generated method stubthis.session = arg0;}public File getPicture() {return picture;}public void setPicture(File picture) {this.picture = picture;}public String getPictureContentType() {return pictureContentType;}public void setPictureContentType(String pictureContentType) {this.pictureContentType = pictureContentType;}public String getPictureFileName() {return pictureFileName;}public void setPictureFileName(String pictureFileName) {this.pictureFileName = pictureFileName;}public String getSavePath() throws Exception {return ServletActionContext.getRequest().getRealPath(savePath);}public void setSavePath(String savePath) {this.savePath = savePath;}public String getSechand_result() {return sechand_result;}public void setSechand_result(String sechand_result) {this.sechand_result = sechand_result;}}

 

 

（7）JSP页面就不贴出来啦，欢迎大家批评指正