struts2的异常处理

  1. 全局异常处理

    • 新建异常处理包及类-建立一个异常处理类

      cn.itcast.shoa.exception

      cn.itcast.shoa.exception.MyException.java

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      package cn.itcast.shoa.exception;

      import com.opensymphony.xwork2.ActionContext;
      import com.opensymphony.xwork2.ActionSupport;

      public class MyException extends ActionSupport{

      	private Exception exception;

      	public Exception getException() {
      		return exception;
      	}

      	public void setException(Exception exception) {
      		this.exception = exception;
      	}
      	
      	public String execute() {
      		//将获取到的异常放入栈顶
      		ActionContext.getContext().getValueStack().push(exception.getMessage());
      		return "error";
      	}
      }

    • struts.xml配置文件进行配置

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      <?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.devMode" value="true"/>
      	<constant name="struts.ui.theme" value="simple"/>
      	
      	<include file="struts/struts-person.xml"></include>
      	<include file="struts/struts-department.xml"></include>
      	<include file="struts/struts-role.xml"></include>
      	<!-- 异常处理 -->
      	<package name="struts-global" namespace="/" extends="struts-default">
      		<global-results>
      			<result name="errHandler" type="chain">
      				<param name="actionName">errorProcessor</param>
      			</result>
      		</global-results>
      		
      		<global-exception-mappings>
      			<exception-mapping exception="java.lang.Exception"
      				result="errHandler" />
      		</global-exception-mappings>

      		<action name="errorProcessor" class="cn.itcast.shoa.exception.MyException">
      			<result name="error">WEB-INF/jsp/error.jsp</result>
      		</action>
      	</package>
      	
      </struts>

    • struts-role.xml配置文件 在role管理使用异常处理测试 所以配置文件继承异常处理

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      <?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>
      	<!-- 继承异常处理 -->
      	<package name="role" namespace="/" extends="struts-global">
      		<action name="roleAction_*" method="{1}" class="roleAction">
      			<result name="listAction">/WEB-INF/jsp/system/role/list.jsp</result>
      			<result name="addUI">/WEB-INF/jsp/system/role/add.jsp</result>
      			<result name="updateUI">/WEB-INF/jsp/system/role/update.jsp</result>
      			<result name="action2action" type="redirectAction">roleAction_showAllRole.action</result>
      		</action>
      	</package>
      </struts>

      从上述代码看来：extends=”struts-global”，所以role模块就拥有了struts-global包(package)里的所有功能

    • 测试 在RoleServiceImpl

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      @Override
      public Collection<Role> getAllRole() {
      	// TODO Auto-generated method stub
      	int i = 1/0;
      	//throw new RuntimeException("abc");
      	return this.roleDao.getAllEntry();
      }

    • error.jsp

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      <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
      <%@ include file="/WEB-INF/jsp/common/common.jsp"%>
      <html>
      <head>
      	<title>部门设置</title>
          <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
      </head>
      <body>
      	<s:property/>
      </body>
      </html>

用户管理模块

  1. 用户的查询

    在页面显示的数据来源于3张表

    • user
    • department
    • role

    后台的sql：

    • from user
    • 该sql只是把user的数据查出，没有把相应的部门数据和岗位数据查出

    在前台

    • 显示部门名称

    • 如果在web.xml文件配置了OpenSessionInView模式

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      <s:iterator value="#userList">
      	<s:property value="department.name"/>
      </s:iterator>

    • 如果没有配置OpenSessionInView模式

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      from user u left outer join fetch u.department d left outer join fetch u.role r

    vo：view object

    ​ UserView

    ​ username

    ​ departmentname

    ​ roles

    bo：busineww object

    pojo：entity object

    如果采用vo和pojo会造成从vo到pojo的转换

    一般采用的技术方式是：

    ​ 在web.xml文件配置OpenSessionInView模式，这样在jsp页面中session也不会关闭

  2. UserDao

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    package cn.itcast.shoa.dao;

    import cn.itcast.shoa.dao.base.BaseDao;
    import cn.itcast.shoa.domain.system.User;

    public interface UserDao extends BaseDao<User>{

    }

  3. UserDaoImpl

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    package cn.itcast.shoa.dao.impl;

    import org.springframework.stereotype.Repository;

    import cn.itcast.shoa.dao.UserDao;
    import cn.itcast.shoa.dao.base.impl.BaseDaoImpl;
    import cn.itcast.shoa.domain.system.User;

    @Repository("userDao")
    public class UserDaoImpl extends BaseDaoImpl<User> implements UserDao{

    }

  4. UserService

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    package cn.itcast.shoa.service;

    import java.io.Serializable;
    import java.util.Collection;

    import cn.itcast.shoa.domain.system.User;


    public interface UserService {

    	/*
    	 * 查找所有用户
    	 */
    	public Collection<User> getAllUser();
    	
    	/*
    	 * 查找单个用户
    	 */
    	public User getUserById(Serializable id);
    	
    	/*
    	 * 保存用户
    	 */
    	public void saveUser(User user);
    	
    	/*
    	 * 删除用户
    	 */
    	public void deleteUser(Serializable id);

    	/*
    	 * 修改用户
    	 */
    	public void updateUser(User user);
    	
    }

  5. UserServiceImpl

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    package cn.itcast.shoa.service.impl;

    import java.io.Serializable;
    import java.util.Collection;

    import javax.annotation.Resource;

    import org.hibernate.annotations.Source;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;

    import cn.itcast.shoa.dao.UserDao;
    import cn.itcast.shoa.domain.system.User;
    import cn.itcast.shoa.service.UserService;

    @Service("userService")
    public class UserServiceImpl implements UserService{
    	
    	@Resource(name="userDao")
    	private UserDao userDao;

    	@Override
    	public Collection<User> getAllUser() {
    		// TODO Auto-generated method stub
    		return this.userDao.getAllEntry();
    	}

    	@Override
    	public User getUserById(Serializable id) {
    		// TODO Auto-generated method stub
    		return this.userDao.getEntryById(id);
    	}

    	@Transactional(readOnly=false)
    	public void saveUser(User user) {
    		// TODO Auto-generated method stub
    		this.userDao.saveEntry(user);
    	}

    	@Transactional(readOnly=false)
    	public void deleteUser(Serializable id) {
    		// TODO Auto-generated method stub
    		this.userDao.deleteEntry(id);
    	}

    	@Transactional(readOnly=false)
    	public void updateUser(User user) {
    		// TODO Auto-generated method stub
    		this.userDao.updateEntry(user);
    	}

    }

  6. UserAction

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    package cn.itcast.shoa.struts.action;

    import java.util.Collection;

    import javax.annotation.Resource;

    import org.springframework.beans.BeanUtils;
    import org.springframework.context.annotation.Scope;
    import org.springframework.stereotype.Controller;

    import com.opensymphony.xwork2.ActionContext;

    import cn.itcast.shoa.domain.system.User;
    import cn.itcast.shoa.service.UserService;
    import cn.itcast.shoa.struts.action.base.BaseAction;

    @Controller("userAction")
    @Scope("prototype")
    public class UserAction extends BaseAction<User>{
    	
    	@Resource(name="userService")
    	private UserService userService;
    	
    	public String showAllUser() {
    		Collection<User> userList = this.userService.getAllUser();
    		ActionContext.getContext().put("userList", userList);
    		return listAction;
    	}
    	
    }

  7. struts.xml

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    <include file="struts/struts-user.xml"></include>

  8. struts-user.xml

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    <?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>
    	<!-- 继承异常处理 -->
    	<package name="user" namespace="/" extends="struts-default">
    		<action name="userAction_*" method="{1}" class="userAction">
    			<result name="listAction">/WEB-INF/jsp/system/user/list.jsp</result>
    			<result name="addUI">/WEB-INF/jsp/system/user/add.jsp</result>
    			<result name="updateUI">/WEB-INF/jsp/system/user/update.jsp</result>
    			<result name="action2action" type="redirectAction">userAction_showAllUser.action</result>
    		</action>
    	</package>
    </struts>

  9. list.jsp-WEB-INF/jsp/system/user/list.jsp

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    <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%@ include file="/WEB-INF/jsp/common/common.jsp"%>
    <html>
    <head>
        <title>用户列表</title>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    </head>
    <body>

    <div id="Title_bar">
        <div id="Title_bar_Head"> 
            <div id="Title_Head"></div>
            <div id="Title"><!--页面标题-->
                <img border="0" width="13" height="13" src="${pageContext.request.contextPath}/css/images/title_arrow.gif"/> 用户管理
            </div>
            <div id="Title_End"></div>
        </div>
    </div>

    <div id="MainArea">
        <table cellspacing="0" cellpadding="0" class="TableStyle">
           
            <!-- 表头-->
            <thead>
                <tr align=center valign=middle id=TableTitle>
                    <td width="100">姓名</td>
                    <td width="100">所属部门</td>
                    <td>所属岗位</td>
                    <td>相关操作</td>
                </tr>
            </thead>
            
            <!--显示数据列表-->
            <tbody id="TableData" class="dataContainer" datakey="userList">
            	<s:iterator value="#userList">
    	            <tr class="TableDetail1 template">
    	                <td><s:property value="username"/></td>
    	                <td><s:property value="department.name"/></td>
    	                <td>
    	                	<s:iterator value="roles">
    	                		<s:property value="name"/>
    	                	</s:iterator>
    	                </td>
    	                <td><a onClick="return delConfirm()" href="list.html">删除</a>
    	                    <a href="saveUI.html">修改</a>
    						<a href="javascript:privilegeclick();">设置权限</a>
    	                </td>
    	            </tr>
                </s:iterator>
            </tbody>
        </table>
        
         <div id="TableTail">
            <div id="TableTail_inside">
                <a href="saveUI.html"><img src="${pageContext.request.contextPath}/css/images/createNew.png" /></a>
            </div>
        </div>
        
        <div class="ItemBlock_Title1" id="userTitle" style="display: none;"><!-- 信息说明 --><div class="ItemBlock_Title1">
            	<img border="0" width="4" height="7" src="${pageContext.request.contextPath}/css/blue/images/item_point.gif"/>用户:王欣然
            	<div id="userImage"></div>
            </div>
        <div class="ItemBlock_Title1" id="privilegeTitle" style="display: none;"><div class="ItemBlock_Title1">
            	<img border="0" width="4" height="7" src="${pageContext.request.contextPath}/css/blue/images/item_point.gif" />选择权限</div> 
            </div>
            
            <!-- 表单内容显示 -->
            <div class="ItemBlockBorder" style="display: none;" id="privilegeContent">
                <div class="ItemBlock">
                    <table cellpadding="0" cellspacing="0" class="mainForm">
    					<!--表头-->
    					<thead>
    						<tr align="LEFT" valign="MIDDLE" id="TableTitle">
    							<td width="300px" style="padding-left: 7px;">
    								<!-- 如果把全选元素的id指定为selectAll，并且有函数selectAll()，就会有错。因为有一种用法：可以直接用id引用元素 -->
    								<input type="checkbox" id="allchecked" onchange="privilegeCheckedAll(this.checked,this.id)"/>
    								<label for="cbSelectAll">全选</label>
    							</td>
    						</tr>
    					</thead>
                       
    			   		<!--显示数据列表-->
    					<tbody id="TableData">
    						<tr class="TableDetail1">
    							<!-- 显示权限树 -->
    							<td>
    								<ul id='privilegeTree' class="tree">
    							</td>
    						</tr>
    					</tbody>
                    </table>
                </div>
            </div>
            <!-- 表单操作 -->
            <div id="InputDetailBar">
                <image onclick="savePrivilege()" src="${pageContext.request.contextPath}/css/images/save.png"/>
            </div>
    </div>

    </body>
    </html>