（五）sturts2+spring整合

一、Spring与Struts的整合

1.1：加入Spring的jar包。
1.2：加入Struts的jar包。
1.3：加入Struts与Spring的整合jar//struts2-spring-plugin-2.3.28.jar。

• 功能：将Struts中的Action对象交给Spring来管理。Spring可以往Action中依赖注入对象。

1.4　： 配置文件

　　web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>spring_struts2_1</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>

  <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring.xml</param-value>
  </context-param>

  <filter>
      <filter-name>encoding</filter-name>
      <filter-class>filter.EncodingFilter</filter-class>
  </filter>
  <filter-mapping>
      <filter-name>encoding</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>

  <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>

• struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />

            <constant name="struts.i18n.encoding" value="UTF-8"></constant>
            <constant name="struts.multipart.maxSize" value="209715200"></constant>
            <constant name="struts.action.extension" value="action,do,"></constant>
            <constant name="struts.enable.DynamicMethodInvocation" value="true" />
            <constant name="struts.devMode" value="true" />
            <constant name="struts.i18n.reload" value="true"></constant>
            <constant name="struts.ui.theme" value="simple" />
            <constant name="struts.configuration.xml.reload" value="true"></constant>
            <constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>
            <constant name="struts.handle.exception" value="true"></constant>

        <!--  配置这２个常量。这样Struts的对象才能交给Spring来管理。并且Spring对象注入的方式是根据名称来注入-->
            <constant name="struts.objectFactory" value="spring"></constant>
            <constant name="struts.objectFactory.spring.autoWire" value="name"></constant>

    <package name="default" namespace="/" extends="struts-default">
        <action name="testAction" class="action.TestAction">
            <result name="main">main.jsp</result>
        </action>
    </package>

</struts>

• 注意配置<constant name="struts.objectFactory" value="spring"></constant>
• <constant name="struts.objectFactory.spring.autoWire" value="name"></constant> 这两个常量，第一个用于struts的action交给spring管理，并且spring注入的方式是根据名称来注入，比如TesetAction中有一个成员属性UserService userService(必须有set方法) 然后在spring.xml中配置一个bean 的id为"userService"的（必须与acton中的成员属性名一致），这样spring.xml的bean会自动关联到TestAction的userService里了。

spring.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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <constructor-arg index="0"  name="driverClassName" value="com.mysql.jdbc.Driver" ></constructor-arg>
        <constructor-arg index="1" name="url"  value="jdbc:mysql://127.0.0.1:3306/user?useUnicode=true&amp;characterEncoding=UTF-8" ></constructor-arg>
        <constructor-arg index="2" name="username" value="root"></constructor-arg>
        <constructor-arg index="3" name="password" value=""></constructor-arg>
    </bean>

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <bean id="userService" class="service.UserServiceImpl">
        <property name="userdao" >
            <bean class="dao.UserDao">
                <property name="jdbcTemplate" ref="jdbcTemplate"></property>
            </bean>
        </property>
    </bean>

    </beans>

1.5 写action、servlet、dao等

二、案例

• 配置文件：web.xml、struts.xml、spring.xml如上面所述。
• index.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%String path=request.getContextPath(); %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <a href="<%=path %>/testAction!list">spring和struts2整合</a>
</body>
</html>

• TestAction.java

package action;

import java.util.List;

import org.apache.struts2.components.ActionComponent;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.util.ValueStack;

import bean.UserBean;
import service.UserServiceI;
import util.BaseAction;

public class TestAction extends BaseAction{

    private UserServiceI userService;

    public void setUserService(UserServiceI userService) {
        this.userService = userService;
    }

    @Override
    public String execute() throws Exception {

        return null;
    }

    public String list(){
        List<UserBean> userList=userService.getUserList();

        ValueStack valuestack=ActionContext.getContext().getValueStack();

        valuestack.set("userList", userList);

        return "main";
    }

}

• UserServiceI .java

package service;

import java.util.List;

import bean.UserBean;

public interface UserServiceI {
    List<UserBean> getUserList();
}

• UserServiceImpl.java

package service;

import java.util.List;

import bean.UserBean;
import dao.UserDao;

public class UserServiceImpl implements UserServiceI {

    private UserDao userdao;

    public void setUserdao(UserDao userdao) {
        this.userdao = userdao;
    }

    public List<UserBean> getUserList() {

        return userdao.getUserList();
    }

}

• UserDao.java

package dao;

import java.util.List;

import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;

import bean.UserBean;

public class UserDao extends JdbcDaoSupport{

    public List<UserBean> getUserList() {

        String sql="select * from user";

        List<UserBean> userList=this.getJdbcTemplate().query(sql, new BeanPropertyRowMapper<UserBean>(UserBean.class));

        return userList;
    }

}

• UserBean.java

package bean;

public class UserBean {
    private String userName;
    private int age;
    private String sex;
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
}

• BaseAction.java

package util;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.util.ServletContextAware;

import com.opensymphony.xwork2.ActionSupport;

public abstract class BaseAction extends ActionSupport implements
        ServletRequestAware, ServletResponseAware, ServletContextAware {
    protected HttpServletRequest request;
    protected HttpServletResponse response;
    protected ServletContext context;
    protected HttpSession session;
    protected PrintWriter out;

    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
        if (this.request != null) {
            this.session = this.request.getSession();
        }
    }

    public void setServletResponse(HttpServletResponse response) {
        this.response = response;
        if (this.response != null) {
            try {
                this.response.setContentType("text/html");
                this.out = this.response.getWriter();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public void setServletContext(ServletContext context) {
        this.context = context;
    }

    public abstract String execute() throws Exception;
}

EncodingFilter.java

package filter;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

/**
 * 此过滤器用于解决get和post请求中问乱码的问题。
 */
public class EncodingFilter implements Filter {

    public EncodingFilter() {

    }

    public void destroy() {

    }

/**
 *     要解决乱码问题首先区别对待POST方法和GET方法，
 *     1.如果是POST方法，则用request.setCharacterEncoding("UTF-8"); 即可
 *     2.如果是GET方法，则麻烦一些，需要用decorator设计模式包装request对象来解决
 */
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
         HttpServletRequest request=(HttpServletRequest)req;
         HttpServletResponse response=(HttpServletResponse)res;

         //获取request请求是get还是post
         String method=request.getMethod();

         if(method.equals("GET") || method.equals("get")){  //注意大小写都要判断，一般来说是大写的GET
             /**
              * request请求为get请求,则用包装类对request对象的getParameter方法进行覆盖。
              */
             response.setContentType("text/html;charset=UTF-8");
             MyGetHttpServletRequestWrapper requestWrapper=new MyGetHttpServletRequestWrapper(request);
             chain.doFilter(requestWrapper, response); 

         }else{
             //post请求
              response.setContentType("text/html;charset=UTF-8");
             request.setCharacterEncoding("UTF-8");
             chain.doFilter(request, response); 

         }

    }

    public void init(FilterConfig fConfig) throws ServletException {
    }

}

class MyGetHttpServletRequestWrapper extends HttpServletRequestWrapper{

        HttpServletRequest request;
    public MyGetHttpServletRequestWrapper(HttpServletRequest request) {
        super(request);
        this.request=request;

    }

    /**
     *       servlet API中提供了一个request对象的Decorator设计模式的默认实现类HttpServletRequestWrapper,
     *               (HttpServletRequestWrapper类实现了request接口中的所有方法，但这些方法的内部实现都是仅仅调用了一下所包装的的
     *               request对象的对应方法) 以避免用户在对request对象进行增强时需要实现request接口中的所有方法。
     *               所以当需要增强request对象时，只需要写一个类继承HttpServletRequestWrapper类，然后在重写需要增强的方法即可
     * 具体步骤：
      *1.实现与被增强对象相同的接口
      *2、定义一个变量记住被增强对象
     *3、定义一个构造函数，接收被增强对象 4、覆盖需要增强的方法 5、对于不想增强的方法，直接调用被增强对象（目标对象）的方法
     */

    @Override
    public String getParameter(String name) {

        String old_value=super.getParameter(name);
        String new_value=null;

        if(old_value!=null && !old_value.equals("")){
            try {
                new_value=new String(old_value.getBytes("ISO-8859-1"),"UTF-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }

        }

        return new_value;
    }

    @Override
    public String[] getParameterValues(String name) {

        String[] old_value=request.getParameterValues(name);
        String[] new_value=new String[old_value.length];

        if(old_value!=null && !old_value.equals("")){
            String temp_value=null;
            for(int i=0;i<old_value.length;i++){
                try {
                    temp_value=new String(old_value[i].getBytes("ISO-8859-1"),"UTF-8");
                    new_value[i]=temp_value;
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }

            }

        }

        return new_value;
    }

    /**
     * 使用struts封装的作用域，把reuqest、session、servletContext作用域封装成Map,
     * 所以struts的OGNL表达式在获取请求参数值的时候是并不是调用request.getParameter（）或getParameterValues方法
     * 而是调用request.getParameterMap（）方法。
     * 要解决struts2中OGNL获取parameters中请求参数值乱码的问题，只要覆盖request.getParameterMap（）方法既可。
     */
    @Override
    public Map getParameterMap() {
        try {
            if (!this.request.getMethod().equals("GET")) {// 判断是否是get请求方式，不是get请求则直接返回
                return this.request.getParameterMap();
            }

            Map<String, String[]> map = this.request.getParameterMap(); // 接受客户端的数据
            Map<String, String[]> newmap = new HashMap();
            for (Map.Entry<String, String[]> entry : map.entrySet()) {
                String name = entry.getKey();
                String values[] = entry.getValue();

                if (values == null) {
                    newmap.put(name, new String[] {});
                    continue;
                }
                String newvalues[] = new String[values.length];
                for (int i = 0; i < values.length; i++) {
                    String value = values[i];
                    value = new String(value.getBytes("iso8859-1"), this.request.getCharacterEncoding());
                    newvalues[i] = value; // 解决乱码后封装到Map中
                }

                newmap.put(name, newvalues);
            }

            return newmap;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

}

• main.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ taglib prefix="s"  uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <table border="1">
        <tr>
            <th>姓名</th>
            <th>年龄</th>
            <th>性别</th>
        </tr>
        <s:iterator value="userList">
        <tr>
            <td><s:property value="userName" /></td>
            <td><s:property value="age" /></td>
            <td><s:property value="sex" /></td>
        </tr>
        </s:iterator>
    </table>
</body>
</html>

结果：

---

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所有代码都在这里： 链接  （数据库文件user.sql在webContent里）